[2/4] stratos git commit: Moving Cloud controller's iaas package back to iaases, since this involves config changes, which we shouldn't be doing.

[ni...@apache.org]

http://git-wip-us.apache.org/repos/asf/stratos/blob/0984bcef/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/CloudstackIaas.java
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diff --git a/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/CloudstackIaas.java b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/CloudstackIaas.java
new file mode 100644
index 0000000..a67fe8d
--- /dev/null
+++ b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/CloudstackIaas.java
@@ -0,0 +1,540 @@
+package org.apache.stratos.cloud.controller.iaases;
+
+
+import org.apache.commons.lang.StringUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.stratos.cloud.controller.exception.CloudControllerException;
+import org.apache.stratos.cloud.controller.exception.InvalidHostException;
+import org.apache.stratos.cloud.controller.exception.InvalidRegionException;
+import org.apache.stratos.cloud.controller.exception.InvalidZoneException;
+import org.apache.stratos.cloud.controller.util.ComputeServiceBuilderUtil;
+import org.apache.stratos.cloud.controller.domain.IaasProvider;
+import org.apache.stratos.cloud.controller.util.CloudControllerConstants;
+import org.apache.stratos.cloud.controller.iaases.validators.CloudstackPartitionValidator;
+import org.apache.stratos.cloud.controller.iaases.validators.PartitionValidator;
+import org.jclouds.cloudstack.CloudStackApi;
+import org.jclouds.cloudstack.compute.options.CloudStackTemplateOptions;
+import org.jclouds.cloudstack.domain.*;
+import org.jclouds.cloudstack.features.VolumeApi;
+import org.jclouds.cloudstack.options.ListPublicIPAddressesOptions;
+import org.jclouds.cloudstack.options.ListZonesOptions;
+import org.jclouds.compute.ComputeServiceContext;
+import org.jclouds.compute.domain.NodeMetadata;
+import org.jclouds.compute.domain.Template;
+import org.jclouds.compute.domain.TemplateBuilder;
+import org.jclouds.compute.options.TemplateOptions;
+import org.jclouds.domain.Location;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeoutException;
+
+public class CloudstackIaas extends Iaas {
+
+    private static final Log log = LogFactory.getLog(CloudstackIaas.class);
+
+    public CloudstackIaas(IaasProvider iaasProvider) {
+        super(iaasProvider);
+    }
+
+    @Override
+    public void buildComputeServiceAndTemplate() {
+        // builds and sets Compute Service
+        ComputeServiceBuilderUtil.buildDefaultComputeService(getIaasProvider());
+        // builds and sets Template
+        buildTemplate();
+    }
+
+    @Override
+    public void buildTemplate() {
+
+        IaasProvider iaasInfo = getIaasProvider();
+
+        //if compute service is not available
+        if (iaasInfo.getComputeService() == null) {
+            String msg = "Compute service is null for IaaS provider: "
+                    + iaasInfo.getName();
+            log.error(msg);
+            throw new CloudControllerException(msg);
+        }
+
+        //create templateBuilder
+        TemplateBuilder templateBuilder = iaasInfo.getComputeService()
+                .templateBuilder();
+
+        //**SET PROPERTIES TO templateBuilder OBJECT**//
+
+        /**
+         * PROPERTY - 1
+         * set image id specified
+         */
+        templateBuilder.imageId(iaasInfo.getImage());
+
+        /**
+         *  PROPERTY-2
+         *  if user has specified a zone in cloud-controller.xml, set the zone into templateBuilder object
+         *  (user should provide the zone id for this, because zone name is not unique in cloudstack)
+         */
+        if (iaasInfo.getProperty(CloudControllerConstants.AVAILABILITY_ZONE) != null) {
+            Set<? extends Location> locations = iaasInfo.getComputeService().listAssignableLocations();
+            for (Location location : locations) {
+                if (location.getId().equals(iaasInfo.getProperty(CloudControllerConstants.AVAILABILITY_ZONE))) {
+                    //if the zone is valid set the zone to templateBuilder Object
+                    templateBuilder.locationId(location.getId());
+                    log.info("Zone has been set as " + iaasInfo.getProperty(CloudControllerConstants.AVAILABILITY_ZONE)
+                            + " with id: " + location.getId());
+                    break;
+                }
+            }
+        }
+
+        /**
+         * PROPERTY-3
+         * if user has specified an instance type in cloud-controller.xml, set the instance type into templateBuilder
+         * object.(service offering)
+         *Important:Specify the Service Offering type ID. Not the name. Because the name is not unique in cloudstack.
+         */
+        if (iaasInfo.getProperty(CloudControllerConstants.INSTANCE_TYPE) != null) {
+            templateBuilder.hardwareId(iaasInfo.getProperty(CloudControllerConstants.INSTANCE_TYPE));
+        }
+
+        //build the template
+        Template template = templateBuilder.build();
+
+        /**if you wish to auto assign IPs, instance spawning call should be
+         * blocking, but if you
+         * wish to assign IPs manually, it can be non-blocking.
+         * is auto-assign-ip mode or manual-assign-ip mode?
+         */
+        boolean blockUntilRunning = Boolean.parseBoolean(iaasInfo
+                .getProperty(CloudControllerConstants.AUTO_ASSIGN_IP));
+        template.getOptions().as(TemplateOptions.class)
+                .blockUntilRunning(blockUntilRunning);
+
+        // this is required in order to avoid creation of additional security
+        // groups by Jclouds.
+        template.getOptions().as(TemplateOptions.class)
+                .inboundPorts(new int[]{});
+
+
+        //**SET CLOUDSTACK SPECIFIC PROPERTIES TO TEMPLATE OBJECT**//
+
+        //set security group - If you are using basic zone
+        if (iaasInfo.getProperty(CloudControllerConstants.SECURITY_GROUP_IDS) != null) {
+            template.getOptions()
+                    .as(CloudStackTemplateOptions.class)
+                    .securityGroupIds(Arrays.asList(iaasInfo.getProperty(CloudControllerConstants.SECURITY_GROUP_IDS)
+                            .split(CloudControllerConstants.ENTRY_SEPARATOR)));
+        }
+
+
+        /**
+         * set network ID - If you are using advanced zone
+         * in cloudstack sometimes we get unautorized exception if we didn't specify the
+         * domain ID and user name
+         */
+        if (iaasInfo.getProperty(CloudControllerConstants.NETWORK_IDS) != null) {
+            template.getOptions()
+                    .as(CloudStackTemplateOptions.class)
+                    .networks(Arrays.asList(iaasInfo.getProperty(CloudControllerConstants.NETWORK_IDS)
+                            .split(CloudControllerConstants.ENTRY_SEPARATOR)));
+        }
+
+        //set user name
+        if (iaasInfo.getProperty(CloudControllerConstants.USER_NAME) != null) {
+            template.getOptions().as(CloudStackTemplateOptions.class)
+                    .account(iaasInfo.getProperty(CloudControllerConstants.USER_NAME));
+        }
+        //set domain ID
+        if (iaasInfo.getProperty(CloudControllerConstants.DOMAIN_ID) != null) {
+            template.getOptions().as(CloudStackTemplateOptions.class)
+                    .domainId(iaasInfo.getProperty(CloudControllerConstants.DOMAIN_ID));
+        }
+
+        /**
+         *Set key pair
+         * in cloudstack sometimes we get unauthorized exception if we didn't specify the
+         * domain ID and user name
+         */
+        if (iaasInfo.getProperty(CloudControllerConstants.KEY_PAIR) != null) {
+            template.getOptions().as(CloudStackTemplateOptions.class)
+                    .keyPair(iaasInfo.getProperty(CloudControllerConstants.KEY_PAIR));
+        }
+
+        // ability to define tags
+        if (iaasInfo.getProperty(CloudControllerConstants.TAGS) != null) {
+            template.getOptions()
+                    .as(CloudStackTemplateOptions.class)
+                    .tags(Arrays.asList(iaasInfo.getProperty(CloudControllerConstants.TAGS)
+                            .split(CloudControllerConstants.ENTRY_SEPARATOR)));
+        }
+        //set disk offering to the instance
+        if (iaasInfo.getProperty(CloudControllerConstants.DISK_OFFERING) != null) {
+            template.getOptions()
+                    .as(CloudStackTemplateOptions.class)
+                    .diskOfferingId(iaasInfo.getProperty(CloudControllerConstants.DISK_OFFERING));
+        }
+
+        // set Template
+        iaasInfo.setTemplate(template);
+    }
+
+    @Override
+    public void setDynamicPayload() {
+        IaasProvider iaasInfo = getIaasProvider();
+        if (iaasInfo.getTemplate() != null && iaasInfo.getPayload() != null) {
+            iaasInfo.getTemplate().getOptions().as(CloudStackTemplateOptions.class)
+                    .userMetadata(convertByteArrayToHashMap(iaasInfo.getPayload()));
+        }
+    }
+
+    /**
+     * IMPORTANT
+     * In cloudstack we can assign public IPs, if we are using an advanced zone only. If we are using a basic zone
+     * we cannot assign public ips.
+     * <p/>
+     * When we use an advanced zone, a public IP address will get automatically assigned to the vm. So we don't need
+     * to find an unallocated IP address and assign that address to the vm. If you are using a basic zone you cannot
+     * assign public IPs
+     * <p/>
+     * So  this method will find the IP that has been assigned to the vm and return it.
+     */
+    @Override
+    public String associateAddress(NodeMetadata node) {
+
+        IaasProvider iaasInfo = getIaasProvider();
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+        CloudStackApi cloudStackApi = context.unwrapApi(CloudStackApi.class);
+        String ip = null;
+
+        // get all allocated IPs
+        ListPublicIPAddressesOptions listPublicIPAddressesOptions = new ListPublicIPAddressesOptions();
+        listPublicIPAddressesOptions.zoneId(iaasInfo.getProperty(CloudControllerConstants.AVAILABILITY_ZONE));
+
+        Set<PublicIPAddress> publicIPAddresses = cloudStackApi.getAddressApi()
+                .listPublicIPAddresses(listPublicIPAddressesOptions);
+
+        String id = node.getProviderId(); //vm ID
+
+        for (PublicIPAddress publicIPAddress : publicIPAddresses) {
+            if (publicIPAddress.getVirtualMachineId().equals(id)) { //check whether this instance has
+                // already got an public ip or not
+                ip = publicIPAddress.getIPAddress(); //A public ip has been successfully assigned to the vm
+                log.info("Successfully associated an IP address " + ip
+                        + " for node with id: " + node.getId());
+                break;
+            }
+
+        }
+
+        if (ip == null || ip.isEmpty()) { //IP has not been successfully assigned to VM(That means there are
+            //  no more IPs  available for the VM)
+            String msg = "No address associated for node with id: " + node.getId();
+            log.warn(msg);
+            throw new CloudControllerException(msg);
+        }
+
+        return ip;
+    }
+
+    @Override
+    public String associatePredefinedAddress(NodeMetadata node, String ip) {
+        return "";
+    }
+
+    @Override
+    public void releaseAddress(String ip) {
+        IaasProvider iaasInfo = getIaasProvider();
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+        CloudStackApi cloudStackApi = context.unwrapApi(CloudStackApi.class);
+        cloudStackApi.getAddressApi().disassociateIPAddress(ip);
+    }
+
+    @Override
+    public boolean createKeyPairFromPublicKey(String region, String keyPairName, String publicKey) {
+
+        IaasProvider iaasInfo = getIaasProvider();
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+        CloudStackApi cloudStackApi = context.unwrapApi(CloudStackApi.class);
+        SshKeyPair sshKeyPair = cloudStackApi.getSSHKeyPairApi().createSSHKeyPair(keyPairName);
+
+        if (sshKeyPair != null) {
+
+            iaasInfo.getTemplate().getOptions().as(CloudStackTemplateOptions.class)
+                    .keyPair(sshKeyPair.getName());
+
+            log.info("A key-pair is created successfully - Key Pair Name: " + sshKeyPair.getName());
+            return true;
+        }
+        log.error("Key-pair is unable to create");
+        return false;
+    }
+
+    @Override
+    public boolean isValidRegion(String region) throws InvalidRegionException {
+
+        IaasProvider iaasInfo = getIaasProvider();
+        //no such method in Jclouds cloudstack api
+        String msg = "Invalid region: " + region + " in the iaas: " + iaasInfo.getType();
+        log.error(msg);
+        throw new InvalidRegionException(msg);
+    }
+
+    @Override
+    public boolean isValidZone(String region, String zone) throws InvalidZoneException {
+
+        IaasProvider iaasInfo = getIaasProvider();
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+        CloudStackApi cloudStackApi = context.unwrapApi(CloudStackApi.class);
+        ListZonesOptions listZonesOptions = new ListZonesOptions();
+        listZonesOptions.available(true);
+        Set<Zone> zoneSet = cloudStackApi.getZoneApi().listZones(listZonesOptions);
+
+        for (org.jclouds.cloudstack.domain.Zone configuredZone : zoneSet) {
+            if (configuredZone.getName().equalsIgnoreCase(zone)) {
+                return true;
+            }
+        }
+        String msg = "Invalid zone: " + zone + " in the iaas: " + iaasInfo.getType();
+        log.error(msg);
+        throw new InvalidZoneException(msg);
+    }
+
+    @Override
+    public boolean isValidHost(String zone, String host) throws InvalidHostException {
+
+        IaasProvider iaasInfo = getIaasProvider();
+        // there's no such method in jclouds cloustack api
+        String msg = "Invalid host: " + host + " in the zone: " + zone + " and of the iaas: " + iaasInfo.getType();
+        log.error(msg);
+        throw new InvalidHostException(msg);
+
+    }
+
+    @Override
+    public PartitionValidator getPartitionValidator() {
+        return new CloudstackPartitionValidator();
+    }
+
+    @Override
+    public String createVolume(int sizeGB, String snapshotId) {
+
+        // Snapshot id is not there in IaaS.createVolume() method in stratos 4.0.0
+        //todo return volume ID if volume is created
+        IaasProvider iaasInfo = getIaasProvider();
+        ComputeServiceContext context = iaasInfo.getComputeService()
+                .getContext();
+
+        String zone = ComputeServiceBuilderUtil.extractZone(iaasInfo);
+        String diskOfferingID = iaasInfo.getTemplate().getOptions().as(CloudStackTemplateOptions.class)
+                .getDiskOfferingId();
+        if (zone == null && diskOfferingID == null) {
+            log.error("Could not create a volume in the , [zone] : " + zone + " of Iaas : " + iaasInfo);
+            return null;
+        }
+
+        VolumeApi volumeApi = context.unwrapApi(CloudStackApi.class).getVolumeApi();
+
+        Volume volume;
+        if (StringUtils.isEmpty(snapshotId)) {
+            if (log.isInfoEnabled()) {
+                log.info("Creating a volume in the zone " + zone);
+            }
+
+            //cloudstack jcloud api does not return a volume object
+            volumeApi.createVolumeFromCustomDiskOfferingInZone(null, diskOfferingID, zone, sizeGB);
+
+            //  volume = blockStoreApi.createVolumeInAvailabilityZone(zone, sizeGB);
+        } else {
+            if (log.isInfoEnabled()) {
+                log.info("Creating a volume in the zone " + zone + " from the snapshot " + snapshotId);
+            }
+            volumeApi.createVolumeFromSnapshotInZone(null, diskOfferingID, zone);
+        }
+
+        return null;
+    }
+
+    @Override
+    public String attachVolume(String instanceId, String volumeId, String deviceName) {
+        IaasProvider iaasInfo = getIaasProvider();
+        ComputeServiceContext context = iaasInfo.getComputeService()
+                .getContext();
+        CloudStackApi cloudStackApi = context.unwrapApi(CloudStackApi.class);
+
+        //get volume
+        org.jclouds.cloudstack.domain.Volume volume = cloudStackApi.getVolumeApi().getVolume(volumeId);
+
+        //get current volume state
+        Volume.State volumeState = volume.getState();
+
+        if (log.isDebugEnabled()) {
+            log.debug("Volume " + volumeId + " is in state " + volumeState);
+        }
+
+        //if volume is not available, not allocated or cannot use
+        //volume state ALLOCATED   means that volume has not been attached to any instance.
+
+        //TODO there is an error with logic.
+        if (!(volumeState == Volume.State.ALLOCATED || volumeState == Volume.State.CREATING
+                || volumeState == Volume.State.READY)) {
+            log.error(String.format("Volume %s can not be attached. Volume status is %s", volumeId, volumeState));
+        }
+
+        //check whether the account of volume and instance is same
+        if (!volume.getAccount().equals(cloudStackApi.getVirtualMachineApi()
+                .getVirtualMachine(instanceId).getAccount())) {
+            log.error(String.format("Volume %s can not be attached. Instance account and Volume account " +
+                    "are not the same ", volumeId));
+        }
+
+        boolean volumeBecameAvailable = false, volumeBecameAttached = false;
+
+        try {
+            if (volumeState == Volume.State.CREATING) {
+
+                volumeBecameAvailable = waitForStatus(volumeId, Volume.State.ALLOCATED, 5);
+
+            } else if (volumeState == Volume.State.READY) {
+                volumeBecameAvailable = true;
+            }
+
+        } catch (TimeoutException e) {
+            log.error("[Volume ID] " + volumeId + "did not become ALLOCATED within expected timeout");
+        }
+
+        //if volume state is 'ALLOCATED'
+        if (volumeBecameAvailable) {
+
+            //attach volume into instance
+            cloudStackApi.getVolumeApi().attachVolume(volumeId, instanceId);
+
+            try {
+                volumeBecameAttached = waitForStatus(volumeId, Volume.State.READY, 2);
+            } catch (TimeoutException e) {
+                log.error("[Volume ID] " + volumeId + "did not become READY within expected timeout");
+            }
+        }
+
+        try {
+            // waiting 5seconds till volumes are actually attached.
+            Thread.sleep(5000);
+        } catch (InterruptedException ignored) {
+
+        }
+
+        //If volume state is not 'READY'
+        if (!volumeBecameAttached) {
+            log.error(String.format("[Volume ID] %s attachment is called, but not yet became attached", volumeId));
+        }
+
+        log.info(String.format("Volume [id]: %s attachment for instance [id]: %s was successful [status]: Attaching." +
+                " of Iaas : %s", volumeId, instanceId, iaasInfo));
+
+        return "Attaching";
+
+    }
+
+    @Override
+    public void detachVolume(String instanceId, String volumeId) {
+
+
+        IaasProvider iaasInfo = getIaasProvider();
+
+        ComputeServiceContext context = iaasInfo.getComputeService()
+                .getContext();
+
+        if (log.isDebugEnabled()) {
+            log.debug(String.format("Starting to detach volume %s from the instance %s", volumeId, instanceId));
+        }
+
+        CloudStackApi cloudStackApi = context.unwrapApi(CloudStackApi.class);
+
+        cloudStackApi.getVolumeApi().detachVolume(volumeId);
+
+        try {
+            //TODO this is true only for newly created volumes
+            if (waitForStatus(volumeId, Volume.State.ALLOCATED, 5)) {
+                log.info(String.format("Detachment of Volume [id]: %s from instance [id]: %s was successful of Iaas : %s", volumeId, instanceId, iaasInfo));
+            }
+        } catch (TimeoutException e) {
+            log.error(String.format("Detachment of Volume [id]: %s from instance [id]: %s was unsuccessful. [volume Status] : %s", volumeId, instanceId, iaasInfo));
+        }
+
+    }
+
+    @Override
+    public void deleteVolume(String volumeId) {
+        IaasProvider iaasInfo = getIaasProvider();
+        ComputeServiceContext context = iaasInfo.getComputeService()
+                .getContext();
+        CloudStackApi cloudStackApi = context.unwrapApi(CloudStackApi.class);
+        cloudStackApi.getVolumeApi().deleteVolume(volumeId);
+        log.info("Deletion of Volume [id]: " + volumeId + " was successful. "
+                + " of Iaas : " + iaasInfo);
+    }
+
+    @Override
+    public String getIaasDevice(String device) {//todo implement this method(auto generated method)
+        return null;
+    }
+
+    private boolean waitForStatus(String volumeId, Volume.State expectedStatus, int timeoutInMilliseconds) throws TimeoutException {
+        int timeout = 1000 * 60 * timeoutInMilliseconds;
+        long timout = System.currentTimeMillis() + timeout;
+
+        IaasProvider iaasInfo = getIaasProvider();
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+        CloudStackApi cloudStackApi = context.unwrapApi(CloudStackApi.class);
+
+        //get volume
+        org.jclouds.cloudstack.domain.Volume volume = cloudStackApi.getVolumeApi().getVolume(volumeId);
+
+        Volume.State volumeState = volume.getState();
+
+        while (volumeState != expectedStatus) {
+            try {
+                if (log.isDebugEnabled()) {
+                    log.debug(String.format("Volume %s is still NOT in %s. Current State=%s", volumeId, expectedStatus, volumeState));
+                }
+                if (volumeState == Volume.State.FAILED || volumeState == Volume.State.DESTROYED || volumeState == Volume.State.UNRECOGNIZED) {
+                    log.error("Volume " + volumeId + " is in state" + volumeState);
+                    return false;
+                }
+
+                Thread.sleep(1000);
+                volumeState = volume.getState();
+                if (System.currentTimeMillis() > timout) {
+                    throw new TimeoutException();
+                }
+            } catch (InterruptedException e) {
+                // Ignoring the exception
+            }
+        }
+        if (log.isDebugEnabled()) {
+            log.debug(String.format("Volume %s status became %s", volumeId, expectedStatus));
+        }
+
+        return true;
+    }
+
+    private Map<String, String> convertByteArrayToHashMap(byte[] byteArray) {
+
+        Map<String, String> map = new HashMap<String, String>();
+
+        String stringFromByteArray = new String(byteArray);
+        String[] keyValuePairs = stringFromByteArray.split(",");
+
+        for (String keyValuePair : keyValuePairs) {
+            String[] keyValue = keyValuePair.split("=");
+            if (keyValue.length > 1) {
+                map.put(keyValue[0], keyValue[1]);
+            }
+        }
+
+        return map;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/stratos/blob/0984bcef/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/DockerIaas.java
----------------------------------------------------------------------
diff --git a/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/DockerIaas.java b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/DockerIaas.java
new file mode 100644
index 0000000..da2916b
--- /dev/null
+++ b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/DockerIaas.java
@@ -0,0 +1,151 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.stratos.cloud.controller.iaases;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.stratos.cloud.controller.exception.CloudControllerException;
+import org.apache.stratos.cloud.controller.exception.InvalidHostException;
+import org.apache.stratos.cloud.controller.exception.InvalidRegionException;
+import org.apache.stratos.cloud.controller.exception.InvalidZoneException;
+import org.apache.stratos.cloud.controller.util.ComputeServiceBuilderUtil;
+import org.apache.stratos.cloud.controller.domain.IaasProvider;
+import org.apache.stratos.cloud.controller.iaases.validators.DockerPartitionValidator;
+import org.apache.stratos.cloud.controller.iaases.validators.PartitionValidator;
+import org.jclouds.compute.ComputeService;
+import org.jclouds.compute.domain.Image;
+import org.jclouds.compute.domain.NodeMetadata;
+import org.jclouds.compute.domain.Template;
+
+import java.util.Set;
+
+/**
+ * Docker iaas provider definition.
+ */
+public class DockerIaas extends Iaas {
+
+    private static final Log log = LogFactory.getLog(AWSEC2Iaas.class);
+
+    public DockerIaas(IaasProvider iaasProvider) {
+        super(iaasProvider);
+    }
+
+    @Override
+    public void buildComputeServiceAndTemplate() {
+        // builds and sets Compute Service
+        ComputeServiceBuilderUtil.buildDefaultComputeService(getIaasProvider());
+
+        // builds and sets Template
+        buildTemplate();
+    }
+
+    @Override
+    public void setDynamicPayload() {
+        log.warn("Not implemented: DockerIaas.setDynamicPayload()");
+    }
+
+    @Override
+    public String associateAddress(NodeMetadata node) {
+        log.warn("Not implemented: DockerIaas.associateAddress()");
+        return null;
+    }
+
+    @Override
+    public String associatePredefinedAddress(NodeMetadata node, String ip) {
+        log.warn("Not implemented: DockerIaas.associatePredefinedAddress()");
+        return null;
+    }
+
+    @Override
+    public void releaseAddress(String ip) {
+        log.warn("Not implemented: DockerIaas.releaseAddress()");
+    }
+
+    @Override
+    public boolean createKeyPairFromPublicKey(String region, String keyPairName, String publicKey) {
+        return false;
+    }
+
+    @Override
+    public boolean isValidRegion(String region) throws InvalidRegionException {
+        return true;
+    }
+
+    @Override
+    public boolean isValidZone(String region, String zone) throws InvalidZoneException {
+        return true;
+    }
+
+    @Override
+    public boolean isValidHost(String zone, String host) throws InvalidHostException {
+        return true;
+    }
+
+    @Override
+    public PartitionValidator getPartitionValidator() {
+        return new DockerPartitionValidator();
+    }
+
+    @Override
+    public void buildTemplate() {
+        IaasProvider iaasProvider = getIaasProvider();
+        ComputeService computeService = iaasProvider.getComputeService();
+        Set<? extends Image> images = computeService.listImages();
+        Image image = findImage(images, iaasProvider.getImage());
+        if(image == null) {
+            throw new CloudControllerException(String.format("Docker image not found: %s", iaasProvider.getImage()));
+        }
+        Template template = computeService.templateBuilder().fromImage(image).build();
+        iaasProvider.setTemplate(template);
+    }
+
+    private Image findImage(Set<? extends Image> images, String name) {
+        for(Image image : images) {
+            if(image.getDescription().contains(name))
+                return image;
+        }
+        return null;
+    }
+
+    @Override
+    public String createVolume(int sizeGB, String snapshotId) {
+        return null;
+    }
+
+    @Override
+    public String attachVolume(String instanceId, String volumeId, String deviceName) {
+        return null;
+    }
+
+    @Override
+    public void detachVolume(String instanceId, String volumeId) {
+
+    }
+
+    @Override
+    public void deleteVolume(String volumeId) {
+
+    }
+
+    @Override
+    public String getIaasDevice(String device) {
+        return null;
+    }
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/0984bcef/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/GCEIaas.java
----------------------------------------------------------------------
diff --git a/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/GCEIaas.java b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/GCEIaas.java
new file mode 100644
index 0000000..ba186b2
--- /dev/null
+++ b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/GCEIaas.java
@@ -0,0 +1,459 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one 
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
+ * KIND, either express or implied.  See the License for the 
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.stratos.cloud.controller.iaases;
+
+import java.util.*;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.stratos.cloud.controller.exception.CloudControllerException;
+import org.apache.stratos.cloud.controller.util.ComputeServiceBuilderUtil;
+import org.apache.stratos.cloud.controller.domain.IaasProvider;
+import org.apache.stratos.cloud.controller.domain.NetworkInterface;
+import org.apache.stratos.cloud.controller.iaases.validators.GCEPartitionValidator;
+import org.apache.stratos.cloud.controller.iaases.validators.PartitionValidator;
+import org.apache.stratos.cloud.controller.exception.InvalidHostException;
+import org.apache.stratos.cloud.controller.exception.InvalidRegionException;
+import org.apache.stratos.cloud.controller.exception.InvalidZoneException;
+import org.jclouds.ContextBuilder;
+import org.jclouds.compute.ComputeServiceContext;
+import org.jclouds.compute.domain.NodeMetadata;
+import org.jclouds.compute.domain.Template;
+import org.jclouds.compute.domain.TemplateBuilder;
+import org.jclouds.compute.options.TemplateOptions;
+import org.jclouds.domain.Location;
+import org.apache.stratos.cloud.controller.util.CloudControllerConstants;
+import org.jclouds.collect.IterableWithMarker;
+import org.jclouds.googlecomputeengine.GoogleComputeEngineApi;
+import org.jclouds.googlecomputeengine.features.DiskApi;
+import org.jclouds.googlecomputeengine.features.InstanceApi;
+import org.jclouds.googlecomputeengine.features.RegionApi;
+import org.jclouds.googlecomputeengine.features.ZoneApi;
+import org.jclouds.googlecomputeengine.domain.Disk;
+import org.jclouds.googlecomputeengine.domain.Instance;
+import org.jclouds.googlecomputeengine.domain.Region;
+import org.jclouds.googlecomputeengine.domain.Zone;
+import org.jclouds.googlecomputeengine.domain.Operation;
+import org.jclouds.googlecomputeengine.options.AttachDiskOptions;
+import org.jclouds.googlecomputeengine.options.AttachDiskOptions.DiskType;
+
+import com.google.inject.Key;
+import com.google.inject.Injector;
+import com.google.inject.TypeLiteral;
+import com.google.inject.name.Names;
+
+import static org.jclouds.util.Predicates2.retry;
+import static java.util.concurrent.TimeUnit.SECONDS;
+
+import com.google.common.base.Predicate;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+import com.google.common.util.concurrent.Atomics;
+
+public class GCEIaas extends Iaas {
+
+
+	private static final Log log = LogFactory.getLog(GCEIaas.class);
+	
+	private static final String PROJECTNAME = "projectName";
+	
+	public GCEIaas(IaasProvider iaasProvider) {
+		super(iaasProvider);
+	}
+
+	@Override
+	public void buildComputeServiceAndTemplate() {
+
+		IaasProvider iaasInfo = getIaasProvider();
+		
+		// builds and sets Compute Service
+		ComputeServiceBuilderUtil.buildDefaultComputeService(iaasInfo);
+
+
+		// builds and sets Template
+		buildTemplate();
+
+	}
+
+	public void buildTemplate() {
+		IaasProvider iaasInfo = getIaasProvider();
+		
+		if (iaasInfo.getComputeService() == null) {
+			String msg = "Compute service is null for IaaS provider: "
+					+ iaasInfo.getName();
+			log.fatal(msg);
+			throw new CloudControllerException(msg);
+		}
+
+		log.info("gce buildTemplate");
+
+		TemplateBuilder templateBuilder = iaasInfo.getComputeService()
+				.templateBuilder();
+
+		// set image id specified
+		templateBuilder.imageId(iaasInfo.getImage());
+
+		String zone = iaasInfo.getProperty(CloudControllerConstants.AVAILABILITY_ZONE);
+		if(zone != null) {
+			Set<? extends Location> locations = iaasInfo.getComputeService().listAssignableLocations();
+			for(Location location : locations) {
+				if(location.getScope().toString().equalsIgnoreCase(CloudControllerConstants.ZONE_ELEMENT) &&
+					location.getId().equals(zone)) {
+					templateBuilder.locationId(location.getId());
+					log.info("ZONE has been set as " + zone
+						+ " with id: " + location.getId());
+					break;
+				}
+			}
+		}
+
+		if (iaasInfo.getProperty(CloudControllerConstants.INSTANCE_TYPE) != null) {
+			// set instance type eg: m1.large
+			templateBuilder.hardwareId(iaasInfo.getProperty(CloudControllerConstants.INSTANCE_TYPE));
+		}
+
+		// build the Template
+		Template template = templateBuilder.build();
+
+		if(zone != null) {
+			if(!template.getLocation().getId().equals(zone)) {
+				log.warn("couldn't find assignable ZONE of id :" + zone +
+				" in the IaaS. Hence using the default location as " + template.getLocation().getScope().toString() +
+				" with the id " + template.getLocation().getId());
+			}
+		}
+
+		// if you wish to auto assign IPs, instance spawning call should be
+		// blocking, but if you
+		// wish to assign IPs manually, it can be non-blocking.
+		// is auto-assign-ip mode or manual-assign-ip mode? - default mode is
+		// non-blocking
+		boolean blockUntilRunning = Boolean.parseBoolean(iaasInfo
+				.getProperty("autoAssignIp"));
+		template.getOptions().as(TemplateOptions.class)
+				.blockUntilRunning(blockUntilRunning);
+
+		// this is required in order to avoid creation of additional security
+		// groups by Jclouds.
+		template.getOptions().as(TemplateOptions.class)
+                                .inboundPorts(22, 80, 8080, 443, 8243);
+
+		if (zone != null) {
+			templateBuilder.locationId(zone);
+			log.debug("setting location to " + zone);
+		}
+
+		// ability to define tags with Key-value pairs
+		Map<String, String> keyValuePairTagsMap = new HashMap<String, String>();
+
+		for (String propertyKey : iaasInfo.getProperties().keySet()){
+			if(propertyKey.startsWith(CloudControllerConstants.TAGS_AS_KEY_VALUE_PAIRS_PREFIX)) {
+				keyValuePairTagsMap.put(propertyKey.substring(CloudControllerConstants.TAGS_AS_KEY_VALUE_PAIRS_PREFIX.length()),
+					iaasInfo.getProperties().get(propertyKey));
+				template.getOptions()
+				    .userMetadata(keyValuePairTagsMap);
+			}
+			log.info("usermeta data key:"+ propertyKey + " value: " + iaasInfo.getProperties().get(propertyKey));
+		}
+
+		if (iaasInfo.getNetworkInterfaces() != null) {
+			List<String> networks = new ArrayList<String>(iaasInfo.getNetworkInterfaces().length);
+			for (NetworkInterface ni:iaasInfo.getNetworkInterfaces()) {
+				networks.add(ni.getNetworkUuid());
+				log.info("using network interface " + ni.getNetworkUuid());
+			}
+			template.getOptions().as(TemplateOptions.class).networks(networks);
+			log.info("using network interface " + networks);
+		}
+
+		// set Template
+		iaasInfo.setTemplate(template);
+	}
+
+	@Override
+	public void setDynamicPayload() {
+		// in vCloud case we need to run a script
+		IaasProvider iaasInfo = getIaasProvider();
+
+		if (iaasInfo.getTemplate() == null || iaasInfo.getPayload() == null) {
+			if (log.isDebugEnabled()) {
+				log.debug("Payload for GCE not found");
+			}
+			return;
+		}
+
+		// Payload is a String value
+		String payload = new String(iaasInfo.getPayload());
+
+		log.info("setDynamicPayload " + payload);
+
+		Map<String, String> keyValuePairTagsMap = new HashMap<String, String>();
+		keyValuePairTagsMap.put("stratos_usermetadata", payload);
+		iaasInfo.getTemplate().getOptions().userMetadata(keyValuePairTagsMap);
+	}
+
+	@Override
+	public boolean createKeyPairFromPublicKey(String region, String keyPairName, String publicKey) {
+
+		// Not applicable for GCE - Not called by stratos cloud controller as well
+		return false;
+	}
+
+	@Override
+	public String associateAddress(NodeMetadata node) {
+
+		// TODO
+		return "";
+
+	}
+
+	@Override
+	public String associatePredefinedAddress(NodeMetadata node, String ip) {
+		return "";
+	}
+
+	@Override
+	public void releaseAddress(String ip) {
+		// TODO
+	}
+
+	@Override
+	public boolean isValidRegion(String region) throws InvalidRegionException {
+		IaasProvider iaasInfo = getIaasProvider();
+
+		if (region == null || iaasInfo == null) {
+			String msg = "Region or IaaSProvider is null: region: " + region + " - IaaSProvider: " + iaasInfo;
+			log.error(msg);
+			throw new InvalidRegionException(msg);
+		}
+
+		GoogleComputeEngineApi api = getGCEApi();
+		RegionApi regionApi = api.getRegionApiForProject(iaasInfo.getProperty(PROJECTNAME));
+
+		for(IterableWithMarker<Region> page : regionApi.list()) {
+			for(Region r : page) {
+				if (region.equalsIgnoreCase(r.getName())) {
+					log.debug("Found a matching region: " + region);
+					return true;
+				}
+			}
+		}
+
+		String msg = "Invalid region: " + region +" in the iaas: "+iaasInfo.getType();
+		log.error(msg);
+		throw new InvalidRegionException(msg);
+	}
+
+	@Override
+	public boolean isValidZone(String region, String zone) throws InvalidZoneException {
+		IaasProvider iaasInfo = getIaasProvider();
+
+		if (zone == null || iaasInfo == null) {
+			String msg = "Zone or IaaSProvider is null: region: " + region + 
+				     " zone: " + zone + " - IaaSProvider: " + iaasInfo;
+			log.error(msg);
+			throw new InvalidZoneException(msg);
+		}
+
+		GoogleComputeEngineApi api = getGCEApi();
+		ZoneApi zoneApi = api.getZoneApiForProject(iaasInfo.getProperty(PROJECTNAME));
+
+		for(IterableWithMarker<Zone> page : zoneApi.list()) {
+			for(Zone z : page) {
+				if (zone.equalsIgnoreCase(z.getName())) {
+					log.debug("Found a matching zone: " + zone);
+					return true;
+				}
+			}
+		}
+
+		String msg = "Invalid zone: " + zone + " in the region: " + region + " and of the iaas: " + iaasInfo.getType();
+		log.error(msg);
+		throw new InvalidZoneException(msg);
+	}
+
+	@Override
+	public boolean isValidHost(String zone, String host) throws InvalidHostException {
+		IaasProvider iaasInfo = getIaasProvider();
+
+		// Not called by cloud controller
+		// there's no such concept in GCE
+
+		String msg = "Invalid host: " + host + " in the zone: " + zone + " and of the iaas: " + iaasInfo.getType();
+		log.error(msg);
+		throw new InvalidHostException(msg);
+	}
+
+	@Override
+	public PartitionValidator getPartitionValidator() {
+		return new GCEPartitionValidator();
+	}
+
+	@Override
+        public String createVolume(int sizeGB, String snapshotId) {
+		// generate a random diskname
+		Random rand = new Random();
+		String diskName = "stratos-disk-" + rand.nextInt(100000);
+		DiskApi diskApi = getGCEDiskApi();
+		String zone = getZone();
+
+		log.debug("Creating volume: " + diskName + " in zone: " + zone + " of size: " + sizeGB);
+
+		Operation oper = diskApi.createInZone(diskName, sizeGB, zone);
+
+		oper = waitGCEOperationDone(oper);
+		if (oper.getStatus() != Operation.Status.DONE) {
+			log.error("Failed to create volume: " + diskName + " of size: " + sizeGB +
+				  " in zone: " + zone + " operation: " + oper);
+			return null;
+		}
+
+		return diskName;
+	}
+
+	@Override
+	public String attachVolume(String instanceId, String volumeId, String deviceName) {
+		DiskApi diskApi = getGCEDiskApi();
+		InstanceApi instApi = getGCEInstanceApi();
+		String zone = getZone();
+
+		log.debug("Trying to attach volume: " + volumeId + " to instance: " + instanceId +
+			  " in zone: " + zone + " at devicename: " + deviceName);
+
+		Disk disk = diskApi.getInZone(zone, volumeId);
+		if (disk == null) {
+			log.error("Failed to get volume: " + volumeId + " in zone: " + zone);
+			return null;
+		}
+
+		log.debug("Found volumeId: " + volumeId + " volume: " + disk);
+
+		Operation oper = instApi.attachDiskInZone(zone, instanceId,
+						new AttachDiskOptions().type(DiskType.PERSISTENT)
+							.source(disk.getSelfLink())
+							.mode(AttachDiskOptions.DiskMode.READ_WRITE)
+							.deviceName(deviceName));
+		oper = waitGCEOperationDone(oper);
+		if (oper.getStatus() != Operation.Status.DONE) {
+			log.error("Failed to attach volume: " + volumeId + " to instance: " + instanceId +
+				  " in zone: " + zone + " at device: " + deviceName + " operation: " + oper);
+			return null;
+		}
+
+		return volumeId;
+	}
+
+	@Override
+	public void detachVolume(String instanceId, String volumeId) {
+		InstanceApi instApi = getGCEInstanceApi();
+		String zone = getZone();
+		Instance inst = instApi.getInZone(zone, instanceId);
+
+		log.debug("Trying to detach volume: " + volumeId + " from instance: " + instanceId +
+			  " " + inst + " in zone: " + zone);
+
+		if (inst == null) {
+			log.error("Failed to find instance: " + instanceId + " in zone: " + zone);
+			return;
+		}
+
+		for(Instance.AttachedDisk disk : inst.getDisks()) {
+			Instance.PersistentAttachedDisk persistentDisk = (Instance.PersistentAttachedDisk)disk;
+
+			log.debug("Found disk - src: " + persistentDisk.getSourceDiskName() +
+				  " devicename: " + persistentDisk.getDeviceName());
+
+			if (persistentDisk.getSourceDiskName().equals(volumeId)) {
+				Operation oper = instApi.detachDiskInZone(zone, instanceId, persistentDisk.getDeviceName().get());
+				oper = waitGCEOperationDone(oper);
+				if (oper.getStatus() != Operation.Status.DONE) {
+					log.error("Failed to detach volume: " + volumeId + " to instance: " + instanceId +
+						  " in zone: " + zone + " at device: " + persistentDisk.getDeviceName() +
+						  " result operation: " + oper);
+				}
+				return;
+			}
+		}
+
+		log.error("Cannot find volume: " + volumeId + " in instance: " + instanceId);
+	}
+
+	@Override
+	public void deleteVolume(String volumeId) {
+		DiskApi diskApi = getGCEDiskApi();
+		String zone = getZone();
+
+		log.debug("Deleting volume: " + volumeId + " in zone: " + zone);
+
+		Operation oper = diskApi.deleteInZone(zone, volumeId);
+
+		oper = waitGCEOperationDone(oper);
+		if (oper.getStatus() != Operation.Status.DONE) {
+			log.error("Failed to delete volume: " + volumeId + " in zone: " + zone +
+				  " operation: " + oper);
+		}
+	}
+
+	@Override
+	public String getIaasDevice(String device) {
+		return device;
+	}
+
+	private String getZone() {
+                IaasProvider iaasInfo = getIaasProvider();
+		return iaasInfo.getProperty(CloudControllerConstants.AVAILABILITY_ZONE);
+	}
+
+	private GoogleComputeEngineApi getGCEApi() {
+		IaasProvider iaasInfo = getIaasProvider();
+		ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+		GoogleComputeEngineApi api = context.unwrapApi(GoogleComputeEngineApi.class);
+
+		return api;
+	}
+
+	private DiskApi getGCEDiskApi() {
+		IaasProvider iaasInfo = getIaasProvider();
+		String projectName = iaasInfo.getProperty(PROJECTNAME);
+		return getGCEApi().getDiskApiForProject(projectName);
+	}
+
+	private InstanceApi getGCEInstanceApi() {
+		IaasProvider iaasInfo = getIaasProvider();
+		String projectName = iaasInfo.getProperty(PROJECTNAME);
+		return getGCEApi().getInstanceApiForProject(projectName);
+	}
+
+	private Operation waitGCEOperationDone(Operation operation) {
+		int maxWaitTime = 15; // 15 seconds
+                IaasProvider iaasInfo = getIaasProvider();
+		Injector injector = ContextBuilder.newBuilder(iaasInfo.getProvider())
+					  .credentials(iaasInfo.getIdentity(), iaasInfo.getCredential())
+					  .buildInjector();
+		Predicate<AtomicReference<Operation>> zoneOperationDonePredicate =
+			    injector.getInstance(Key.get(new TypeLiteral<Predicate<AtomicReference<Operation>>>() {
+				}, Names.named("zone")));
+		AtomicReference<Operation> operationReference = Atomics.newReference(operation);
+		retry(zoneOperationDonePredicate, maxWaitTime, 1, SECONDS).apply(operationReference);
+
+		return operationReference.get();
+	}
+}
+

http://git-wip-us.apache.org/repos/asf/stratos/blob/0984bcef/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/Iaas.java
----------------------------------------------------------------------
diff --git a/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/Iaas.java b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/Iaas.java
new file mode 100644
index 0000000..5faeca1
--- /dev/null
+++ b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/Iaas.java
@@ -0,0 +1,173 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one 
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
+ * KIND, either express or implied.  See the License for the 
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.stratos.cloud.controller.iaases;
+
+import org.jclouds.compute.ComputeService;
+import org.jclouds.compute.domain.NodeMetadata;
+import org.jclouds.compute.domain.Template;
+import org.apache.stratos.cloud.controller.exception.InvalidHostException;
+import org.apache.stratos.cloud.controller.exception.InvalidRegionException;
+import org.apache.stratos.cloud.controller.exception.InvalidZoneException;
+import org.apache.stratos.cloud.controller.domain.IaasProvider;
+import org.apache.stratos.cloud.controller.iaases.validators.PartitionValidator;
+
+/**
+ * All IaaSes that are going to support by Cloud Controller, should extend this abstract class.
+ */
+public abstract class Iaas {
+	/**
+	 * Reference to the corresponding {@link IaasProvider}
+	 */
+	private IaasProvider iaasProvider;
+	
+	public Iaas(IaasProvider iaasProvider) {
+		this.setIaasProvider(iaasProvider);
+	}
+	
+	public IaasProvider getIaasProvider() {
+		return iaasProvider;
+	}
+
+	public void setIaasProvider(IaasProvider iaasProvider) {
+		this.iaasProvider = iaasProvider;
+	}
+	
+    /**
+     * This should build the {@link ComputeService} object and the {@link Template} object,
+     * using the information from {@link IaasProvider} and should set the built 
+     * {@link ComputeService} object in the {@link IaasProvider#setComputeService(ComputeService)}
+     * and also should set the built {@link Template} object in the 
+     * {@link IaasProvider#setTemplate(Template)}.
+     */
+    public abstract void buildComputeServiceAndTemplate();
+    
+    /**
+     * This method provides a way to set payload that can be obtained from {@link IaasProvider#getPayload()}
+     * in the {@link Template} of this IaaS.
+     */
+    public abstract void setDynamicPayload();
+    
+    /**
+     * This will obtain an IP address from the allocated list and associate that IP with this node.
+     * @param node Node to be associated with an IP.
+     * @return associated public IP.
+     */
+    public abstract String associateAddress(NodeMetadata node);
+    
+    /**
+     * This will obtain a predefined IP address and associate that IP with this node, if ip is already in use allocate ip from pool 
+     * (through associateAddress())
+     * @param node Node to be associated with an IP.
+     * @ip preallocated floating Ip
+     * @return associated public IP.
+     */
+    public abstract String associatePredefinedAddress(NodeMetadata node, String ip);
+    
+    /**
+     * This will deallocate/release the given IP address back to pool.
+     * @param iaasInfo corresponding {@link IaasProvider}
+     * @param ip public IP address to be released.
+     */
+    public abstract void releaseAddress(String ip);
+    
+    /**
+     * This method should create a Key Pair corresponds to a given public key in the respective region having the name given.
+     * Also should override the value of the key pair in the {@link Template} of this IaaS.
+     * @param region region that the key pair will get created.
+     * @param keyPairName name of the key pair. NOTE: Jclouds adds a prefix : <code>jclouds#</code>
+     * @param publicKey public key, from which the key pair will be created.
+     * @return whether the key pair creation is successful or not.
+     */
+    public abstract boolean createKeyPairFromPublicKey(String region, String keyPairName, String publicKey);
+    
+    /**
+     * Validate a given region name against a particular IaaS.
+     * If a particular IaaS doesn't have a concept called region, it can simply throw {@link InvalidRegionException}.
+     * @param region name of the region.
+     * @return whether the region is valid.
+     * @throws InvalidRegionException if the region is invalid.
+     */
+    public abstract boolean isValidRegion(String region) throws InvalidRegionException;
+    
+    /**
+     * Validate a given zone name against a particular region in an IaaS.
+     * If a particular IaaS doesn't have a concept called zone, it can simply throw {@link InvalidZoneException}.
+     * @param region region of the IaaS that the zone belongs to.
+     * @param zone 
+     * @return whether the zone is valid in the given region or not.
+     * @throws InvalidZoneException if the zone is invalid in a given region.
+     */
+    public abstract boolean isValidZone(String region, String zone) throws InvalidZoneException, InvalidRegionException;
+    
+    /**
+     * Validate a given host id against a particular zone in an IaaS.
+     * If a particular IaaS doesn't have a concept called hosts, it can simply throw {@link InvalidHostException}.
+     * @param zone zone of the IaaS that the host belongs to.
+     * @param host
+     * @return whether the host is valid in the given zone or not.
+     * @throws InvalidHostException if the host is invalid in a given zone.
+     */
+    public abstract boolean isValidHost(String zone, String host) throws InvalidHostException;
+    
+    /**
+     * provides the {@link PartitionValidator} corresponds to this particular IaaS.
+     * @return {@link PartitionValidator}
+     */
+    public abstract PartitionValidator getPartitionValidator();
+
+    /**
+     * Builds only the jclouds {@link Template}
+     */
+    public abstract void buildTemplate();
+    
+    /**
+     * Create a new volume in the respective Iaas.
+     * @param sizeGB size of the volume in Giga Bytes.
+     * @return Id of the created volume.
+     */
+    public abstract String createVolume(int sizeGB, String snapshotId);
+   
+    /**
+     * Attach a given volume to an instance at the specified device path.
+     * @param instanceId of the instance.
+     * @param volumeId volume id of the volume to be attached.
+     * @param deviceName name of the device that the volume would bind to.
+     * @return the status of the attachment.
+     */
+    public abstract String attachVolume(String instanceId, String volumeId, String deviceName);
+    
+    /**
+     * Detach a given volume from the given instance.
+     * @param instanceId of the instance.
+     * @param volumeId volume id of the volume to be detached.
+     */
+    public abstract void detachVolume(String instanceId, String volumeId);
+    
+    /**
+     * Delete a given volume.
+     * @param volumeId volume id of the volume to be detached.
+     */
+    public abstract void deleteVolume(String volumeId);
+
+    /**
+     * This returns the device of the volume specified by the user. This is depends on IAAS. 
+     * For an instance /dev/sdf maps to /dev/xvdf in EC2.
+     */
+    public abstract String getIaasDevice(String device);
+}

http://git-wip-us.apache.org/repos/asf/stratos/blob/0984bcef/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/OpenstackNovaIaas.java
----------------------------------------------------------------------
diff --git a/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/OpenstackNovaIaas.java b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/OpenstackNovaIaas.java
new file mode 100644
index 0000000..46edca8
--- /dev/null
+++ b/components/org.apache.stratos.cloud.controller/src/main/java/org/apache/stratos/cloud/controller/iaases/OpenstackNovaIaas.java
@@ -0,0 +1,740 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one 
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
+ * KIND, either express or implied.  See the License for the 
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.stratos.cloud.controller.iaases;
+
+import com.google.common.base.Optional;
+import com.google.common.base.Predicate;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+
+import org.apache.commons.lang.StringUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.stratos.cloud.controller.exception.CloudControllerException;
+import org.apache.stratos.cloud.controller.exception.InvalidHostException;
+import org.apache.stratos.cloud.controller.exception.InvalidRegionException;
+import org.apache.stratos.cloud.controller.exception.InvalidZoneException;
+import org.apache.stratos.cloud.controller.util.ComputeServiceBuilderUtil;
+import org.apache.stratos.cloud.controller.domain.IaasProvider;
+import org.apache.stratos.cloud.controller.domain.NetworkInterface;
+import org.apache.stratos.cloud.controller.util.CloudControllerConstants;
+import org.apache.stratos.cloud.controller.util.CloudControllerUtil;
+import org.apache.stratos.cloud.controller.iaases.validators.OpenstackNovaPartitionValidator;
+import org.apache.stratos.cloud.controller.iaases.validators.PartitionValidator;
+import org.jclouds.compute.ComputeServiceContext;
+import org.jclouds.compute.domain.NodeMetadata;
+import org.jclouds.compute.domain.NodeMetadataBuilder;
+import org.jclouds.compute.domain.Template;
+import org.jclouds.compute.domain.TemplateBuilder;
+import org.jclouds.compute.options.TemplateOptions;
+import org.jclouds.openstack.nova.v2_0.NovaApi;
+import org.jclouds.openstack.nova.v2_0.compute.options.NovaTemplateOptions;
+import org.jclouds.openstack.nova.v2_0.domain.FloatingIP;
+import org.jclouds.openstack.nova.v2_0.domain.HostAggregate;
+import org.jclouds.openstack.nova.v2_0.domain.KeyPair;
+import org.jclouds.openstack.nova.v2_0.domain.Network;
+import org.jclouds.openstack.nova.v2_0.domain.Volume;
+import org.jclouds.openstack.nova.v2_0.domain.VolumeAttachment;
+import org.jclouds.openstack.nova.v2_0.domain.zonescoped.AvailabilityZone;
+import org.jclouds.openstack.nova.v2_0.extensions.AvailabilityZoneApi;
+import org.jclouds.openstack.nova.v2_0.extensions.FloatingIPApi;
+import org.jclouds.openstack.nova.v2_0.extensions.HostAggregateApi;
+import org.jclouds.openstack.nova.v2_0.extensions.KeyPairApi;
+import org.jclouds.openstack.nova.v2_0.extensions.VolumeApi;
+import org.jclouds.openstack.nova.v2_0.extensions.VolumeAttachmentApi;
+import org.jclouds.openstack.nova.v2_0.options.CreateVolumeOptions;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.concurrent.TimeoutException;
+
+public class OpenstackNovaIaas extends Iaas {
+
+	private static final Log log = LogFactory.getLog(OpenstackNovaIaas.class);
+	private static final String SUCCESSFUL_LOG_LINE = "A key-pair is created successfully in ";
+	private static final String FAILED_LOG_LINE = "Key-pair is unable to create in ";
+
+	public OpenstackNovaIaas(IaasProvider iaasProvider) {
+		super(iaasProvider);
+	}
+	
+	@Override
+	public void buildComputeServiceAndTemplate() {
+
+		IaasProvider iaasInfo = getIaasProvider();
+		
+		// builds and sets Compute Service
+		ComputeServiceBuilderUtil.buildDefaultComputeService(iaasInfo);
+
+		// builds and sets Template
+		buildTemplate();
+
+	}
+
+	public void buildTemplate() {
+		IaasProvider iaasInfo = getIaasProvider();
+		
+		if (iaasInfo.getComputeService() == null) {
+			throw new CloudControllerException(
+					"Compute service is null for IaaS provider: "
+							+ iaasInfo.getName());
+		}
+
+		TemplateBuilder templateBuilder = iaasInfo.getComputeService()
+				.templateBuilder();
+		templateBuilder.imageId(iaasInfo.getImage());
+        if(!(iaasInfo instanceof IaasProvider)) {
+           templateBuilder.locationId(iaasInfo.getType());
+        }
+        
+        // to avoid creation of template objects in each and every time, we
+        // create all at once!
+
+		String instanceType;
+
+		// set instance type
+		if (((instanceType = iaasInfo.getProperty(CloudControllerConstants.INSTANCE_TYPE)) != null)) {
+
+			templateBuilder.hardwareId(instanceType);
+		}
+
+		Template template = templateBuilder.build();
+
+		// In Openstack the call to IaaS should be blocking, in order to retrieve 
+		// IP addresses.
+		boolean blockUntilRunning = true;
+		if(iaasInfo.getProperty(CloudControllerConstants.BLOCK_UNTIL_RUNNING) != null) {
+			blockUntilRunning = Boolean.parseBoolean(iaasInfo.getProperty(
+					CloudControllerConstants.BLOCK_UNTIL_RUNNING));
+		}
+		template.getOptions().as(TemplateOptions.class)
+				.blockUntilRunning(blockUntilRunning);
+
+		// this is required in order to avoid creation of additional security
+		// groups by Jclouds.
+		template.getOptions().as(TemplateOptions.class)
+				.inboundPorts(new int[] {});
+
+		if (iaasInfo.getProperty(CloudControllerConstants.SECURITY_GROUPS) != null) {
+			template.getOptions()
+					.as(NovaTemplateOptions.class)
+					.securityGroupNames(
+							iaasInfo.getProperty(CloudControllerConstants.SECURITY_GROUPS).split(
+									CloudControllerConstants.ENTRY_SEPARATOR));
+		}
+
+		if (iaasInfo.getProperty(CloudControllerConstants.KEY_PAIR) != null) {
+			template.getOptions().as(NovaTemplateOptions.class)
+					.keyPairName(iaasInfo.getProperty(CloudControllerConstants.KEY_PAIR));
+		}
+		
+        if (iaasInfo.getNetworkInterfaces() != null) {
+            Set<Network> novaNetworksSet = new LinkedHashSet<Network>(iaasInfo.getNetworkInterfaces().length);
+            for (NetworkInterface ni:iaasInfo.getNetworkInterfaces()) {
+                novaNetworksSet.add(Network.builder().networkUuid(ni.getNetworkUuid()).fixedIp(ni.getFixedIp())
+                        .portUuid(ni.getPortUuid()).build());
+            }
+            template.getOptions().as(NovaTemplateOptions.class).novaNetworks(novaNetworksSet);
+        }
+		
+		if (iaasInfo.getProperty(CloudControllerConstants.AVAILABILITY_ZONE) != null) {
+			template.getOptions().as(NovaTemplateOptions.class)
+					.availabilityZone(iaasInfo.getProperty(CloudControllerConstants.AVAILABILITY_ZONE));
+		}
+		
+		//TODO
+//		if (iaas.getProperty(CloudControllerConstants.HOST) != null) {
+//            template.getOptions().as(NovaTemplateOptions.class)
+//                    .(CloudControllerConstants.HOST);
+//        }
+
+		// set Template
+		iaasInfo.setTemplate(template);
+	}
+
+    @Override
+	public void setDynamicPayload() {
+
+    	IaasProvider iaasInfo = getIaasProvider();
+    	
+		if (iaasInfo.getTemplate() != null && iaasInfo.getPayload() != null) {
+
+			iaasInfo.getTemplate().getOptions().as(NovaTemplateOptions.class)
+					.userData(iaasInfo.getPayload());
+		}
+
+	}
+
+	@Override
+	public synchronized boolean createKeyPairFromPublicKey(String region, String keyPairName,
+			String publicKey) {
+
+		IaasProvider iaasInfo = getIaasProvider();
+		
+		String openstackNovaMsg = " Openstack-nova. Region: " + region
+				+ " - Name: ";
+
+		ComputeServiceContext context = iaasInfo.getComputeService()
+				.getContext();
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+		KeyPairApi api = novaApi.getKeyPairExtensionForZone(region).get();
+
+		KeyPair keyPair = api.createWithPublicKey(keyPairName, publicKey);
+
+		if (keyPair != null) {
+
+			iaasInfo.getTemplate().getOptions().as(NovaTemplateOptions.class)
+					.keyPairName(keyPair.getName());
+
+			log.info(SUCCESSFUL_LOG_LINE + openstackNovaMsg + keyPair.getName());
+			return true;
+		}
+
+		log.error(FAILED_LOG_LINE + openstackNovaMsg);
+		return false;
+
+	}
+
+	@Override
+	public synchronized String associateAddress(NodeMetadata node) {
+		
+		IaasProvider iaasInfo = getIaasProvider();
+
+		ComputeServiceContext context = iaasInfo.getComputeService()
+				.getContext();
+
+		String region = ComputeServiceBuilderUtil.extractRegion(iaasInfo);
+
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+		FloatingIPApi floatingIp = novaApi.getFloatingIPExtensionForZone(
+				region).get();
+
+		String ip = null;
+		// first try to find an unassigned IP.
+		ArrayList<FloatingIP> unassignedIps = Lists.newArrayList(Iterables
+				.filter(floatingIp.list(),
+						new Predicate<FloatingIP>() {
+
+							@Override
+							public boolean apply(FloatingIP arg0) {
+								return arg0.getInstanceId() == null;
+							}
+
+						}));
+
+		if (!unassignedIps.isEmpty()) {
+			// try to prevent multiple parallel launches from choosing the same
+			// ip.
+			Collections.shuffle(unassignedIps);
+			ip = Iterables.getLast(unassignedIps).getIp();
+		}
+
+		// if no unassigned IP is available, we'll try to allocate an IP.
+		if (ip == null || ip.isEmpty()) {
+			String defaultFloatingIpPool = iaasInfo.getProperty(CloudControllerConstants.DEFAULT_FLOATING_IP_POOL);
+			FloatingIP allocatedFloatingIP;
+			if ((defaultFloatingIpPool == null) || "".equals(defaultFloatingIpPool)) {
+				allocatedFloatingIP = floatingIp.create();
+			} else {
+				allocatedFloatingIP = floatingIp.allocateFromPool(defaultFloatingIpPool);
+			}
+			if (allocatedFloatingIP == null) {
+				String msg = "Failed to allocate an IP address.";
+				log.error(msg);
+				throw new CloudControllerException(msg);
+			}
+			ip = allocatedFloatingIP.getIp();
+		}
+
+		// wait till the fixed IP address gets assigned - this is needed before
+		// we associate a public IP
+		while (node.getPrivateAddresses() == null) {
+			CloudControllerUtil.sleep(1000);
+		}
+		
+		if (node.getPublicAddresses() != null
+				&& node.getPublicAddresses().iterator().hasNext()) {
+			log.info("A public IP ("
+					+ node.getPublicAddresses().iterator().next()
+					+ ") is already allocated to the instance [id] : "
+					+ node.getId());
+			return null;
+		}
+
+		int retries = 0;
+		//TODO make 5 configurable
+		while (retries < 5
+				&& !associateIp(floatingIp, ip, node.getProviderId())) {
+
+			// wait for 5s
+			CloudControllerUtil.sleep(5000);
+			retries++;
+		}
+
+		log.info("Successfully associated an IP address " + ip
+				+ " for node with id: " + node.getId());
+
+		return ip;
+	}
+	
+	@Override
+	public synchronized String associatePredefinedAddress (NodeMetadata node, String ip) {
+		if(log.isDebugEnabled()) {
+			log.debug("OpenstackNovaIaas:associatePredefinedAddress:ip:" + ip);
+		}
+		
+		IaasProvider iaasInfo = getIaasProvider();
+		
+		ComputeServiceContext context = iaasInfo.getComputeService()
+				.getContext();
+
+		String region = ComputeServiceBuilderUtil.extractRegion(iaasInfo);
+
+		FloatingIPApi floatingIp = context.unwrapApi(NovaApi.class).getFloatingIPExtensionForZone(
+                region).get();
+
+		if(log.isDebugEnabled()) {
+			log.debug("OpenstackNovaIaas:associatePredefinedAddress:floatingip:" + floatingIp);
+		}
+		
+		// get the list of all unassigned IP.
+		ArrayList<FloatingIP> unassignedIps = Lists.newArrayList(Iterables
+				.filter(floatingIp.list(),
+						new Predicate<FloatingIP>() {
+
+							@Override
+							public boolean apply(FloatingIP arg0) {
+								// FIXME is this the correct filter?
+								return arg0.getFixedIp() == null;
+							}
+
+						}));
+		
+		boolean isAvailable = false;
+		for (FloatingIP fip : unassignedIps) {
+			if(log.isDebugEnabled()) {
+				log.debug("OpenstackNovaIaas:associatePredefinedAddress:iterating over available floatingip:" + fip);
+			}
+			if (ip.equals(fip.getIp())) {
+				if(log.isDebugEnabled()) {
+					log.debug(String.format("OpenstackNovaIaas:associatePredefinedAddress:floating ip in use:%s /ip:%s", fip, ip));
+				}
+				isAvailable = true;
+				break;
+			}
+		}
+		
+		if (isAvailable) {
+			// assign ip
+			if(log.isDebugEnabled()) {
+				log.debug("OpenstackNovaIaas:associatePredefinedAddress:assign floating ip:" + ip);
+			}
+			// exercise same code as in associateAddress()
+			// wait till the fixed IP address gets assigned - this is needed before
+			// we associate a public IP
+
+			while (node.getPrivateAddresses() == null) {
+				CloudControllerUtil.sleep(1000);
+			}
+
+			int retries = 0;
+			while (retries < 5
+					&& !associateIp(floatingIp, ip, node.getProviderId())) {
+
+				// wait for 5s
+				CloudControllerUtil.sleep(5000);
+				retries++;
+			}
+
+			NodeMetadataBuilder.fromNodeMetadata(node)
+					.publicAddresses(ImmutableSet.of(ip)).build();
+
+			log.info("OpenstackNovaIaas:associatePredefinedAddress:Successfully associated an IP address " + ip
+					+ " for node with id: " + node.getId());
+		} else {
+			// unable to allocate predefined ip,
+			log.info("OpenstackNovaIaas:associatePredefinedAddress:Unable to allocate predefined ip:" 
+					+ " for node with id: " + node.getId());
+			return "";
+		}
+
+		
+		NodeMetadataBuilder.fromNodeMetadata(node)
+				.publicAddresses(ImmutableSet.of(ip)).build();
+
+		log.info("OpenstackNovaIaas:associatePredefinedAddress::Successfully associated an IP address " + ip
+				+ " for node with id: " + node.getId());
+
+		return ip;
+		
+	}	
+
+	@Override
+	public synchronized void releaseAddress(String ip) {
+
+		IaasProvider iaasInfo = getIaasProvider();
+		
+		ComputeServiceContext context = iaasInfo.getComputeService()
+				.getContext();
+
+		String region = ComputeServiceBuilderUtil.extractRegion(iaasInfo);
+
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+		FloatingIPApi floatingIPApi = novaApi.getFloatingIPExtensionForZone(region).get();
+
+		for (FloatingIP floatingIP : floatingIPApi.list()) {
+			if (floatingIP.getIp().equals(ip)) {
+				floatingIPApi.delete(floatingIP.getId());
+				break;
+			}
+		}
+
+	}
+
+	private boolean associateIp(FloatingIPApi api, String ip, String id) {
+		try {
+			api.addToServer(ip, id);
+			return true;
+		} catch (RuntimeException ex) {
+			return false;
+		}
+	}
+
+    @Override
+    public boolean isValidRegion(String region) throws InvalidRegionException {
+    	IaasProvider iaasInfo = getIaasProvider();
+    	
+        // jclouds' zone = region in openstack
+        if (region == null || iaasInfo == null) {
+            String msg =
+                         "Region or IaaSProvider is null: region: " + region + " - IaaSProvider: " +
+                                 iaasInfo;
+            log.error(msg);
+            throw new InvalidRegionException(msg);
+        }
+        
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+        Set<String> zones = novaApi.getConfiguredZones();
+        for (String configuredZone : zones) {
+            if (region.equalsIgnoreCase(configuredZone)) {
+                if (log.isDebugEnabled()) {
+                    log.debug("Found a matching region: " + region);
+                }
+                return true;
+            }
+        }
+        
+        String msg = "Invalid region: " + region +" in the iaas: "+iaasInfo.getType();
+        log.error(msg);
+        throw new InvalidRegionException(msg);
+    }
+
+    @Override
+    public boolean isValidZone(String region, String zone) throws InvalidZoneException {
+    	IaasProvider iaasInfo = getIaasProvider();
+    	
+    	// jclouds availability zone = stratos zone
+    	if (region == null || zone == null || iaasInfo == null) {
+            String msg = "Host or Zone or IaaSProvider is null: region: " + region + " - zone: " +
+                    zone + " - IaaSProvider: " + iaasInfo;
+            log.error(msg);
+            throw new InvalidZoneException(msg);
+        }
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+        Optional<? extends AvailabilityZoneApi> availabilityZoneApi = novaApi.getAvailabilityZoneApi(region);
+        for (AvailabilityZone z : availabilityZoneApi.get().list()) {
+			
+        	if (zone.equalsIgnoreCase(z.getName())) {
+        		if (log.isDebugEnabled()) {
+        			log.debug("Found a matching availability zone: " + zone);
+        		}
+        		return true;
+        	}
+		}
+        
+        String msg = "Invalid zone: " + zone +" in the region: "+region+ " and of the iaas: "+iaasInfo.getType();
+        log.error(msg);
+        throw new InvalidZoneException(msg);
+        
+    }
+
+    @Override
+    public boolean isValidHost(String zone, String host) throws InvalidHostException {
+    	IaasProvider iaasInfo = getIaasProvider();
+    	
+        if (host == null || zone == null || iaasInfo == null) {
+            String msg = String.format("Host or Zone or IaaSProvider is null: host: %s - zone: %s - IaaSProvider: %s", host, zone, iaasInfo);
+            log.error(msg);
+            throw new InvalidHostException(msg);
+        }
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+        HostAggregateApi hostApi = novaApi.getHostAggregateExtensionForZone(zone).get();
+        for (HostAggregate hostAggregate : hostApi.list()) {
+            for (String configuredHost : hostAggregate.getHosts()) {
+                if (host.equalsIgnoreCase(configuredHost)) {
+                    if (log.isDebugEnabled()) {
+                        log.debug("Found a matching host: " + host);
+                    }
+                    return true;
+                }
+            }
+        }
+        
+        String msg = String.format("Invalid host: %s in the zone: %s and of the iaas: %s", host, zone, iaasInfo.getType());
+        log.error(msg);
+        throw new InvalidHostException(msg);
+    }
+
+    @Override
+    public PartitionValidator getPartitionValidator() {
+        return new OpenstackNovaPartitionValidator();
+    }
+
+	@Override
+	public String createVolume(int sizeGB, String snapshotId) {
+		IaasProvider iaasInfo = getIaasProvider();
+		
+		if (iaasInfo == null) {
+		    log.fatal(String.format("Cannot create a new volume with snapshot ID : %s", snapshotId));
+		    return null;
+		}
+		
+		String region = ComputeServiceBuilderUtil.extractRegion(iaasInfo);
+		String zone = ComputeServiceBuilderUtil.extractZone(iaasInfo);
+		
+        if (region == null) {
+        	log.fatal(String.format("Cannot create a new volume. Extracted region is null for Iaas : %s", iaasInfo));
+            return null;
+        }
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();
+
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+        VolumeApi volumeApi = novaApi.getVolumeExtensionForZone(region).get();
+        Volume volume;
+        if(StringUtils.isEmpty(snapshotId)){
+        	if(log.isDebugEnabled()){
+        		log.info("Creating a volume in the zone " + zone);
+        	}
+        	volume = volumeApi.create(sizeGB, CreateVolumeOptions.Builder.availabilityZone(zone));
+        }else{
+        	if(log.isDebugEnabled()){
+        		log.info("Creating a volume in the zone " + zone + " from the shanpshot " + snapshotId);
+        	}
+        	volume = volumeApi.create(sizeGB, CreateVolumeOptions.Builder.availabilityZone(zone).snapshotId(snapshotId));
+        }
+
+        if (volume == null) {
+            log.fatal(String.format("Volume creation was unsuccessful. [region] : %s [zone] : %s of Iaas : %s", region, zone, iaasInfo));
+            return null;
+        }
+
+        String volumeId = volume.getId();
+        /*
+        Volume.Status volumeStatus = this.getVolumeStatus(volumeApi, volumeId);
+
+        if(!(volumeStatus == Volume.Status.AVAILABLE || volumeStatus == Volume.Status.CREATING)){
+            log.error(String.format("Error while creating [volume id] %s. Volume status is %s", volumeId, volumeStatus));
+            return volumeId;
+        }
+        try {
+            if(!waitForStatus(volumeApi, volumeId, Volume.Status.AVAILABLE)){
+                log.error("Volume did not become AVAILABLE. Current status is " + volume.getStatus());
+            }
+        } catch (TimeoutException e) {
+            log.error("[Volume ID] " + volumeId + "did not become AVAILABLE within expected timeout");
+            return volumeId;
+        }
+        */
+		log.info(String.format("Successfully created a new volume [id]: %s in [region] : %s [zone] : %s of Iaas : %s [Volume ID]%s", volume.getId(), region, zone, iaasInfo, volume.getId()));
+		return volumeId;
+	}
+
+    private boolean waitForStatus(String volumeId, Volume.Status expectedStatus, int timeoutInMins) throws TimeoutException {
+        int timeout = 1000 * 60 * timeoutInMins;
+        long timout = System.currentTimeMillis() + timeout;
+
+        IaasProvider iaasInfo = getIaasProvider();
+        String region = ComputeServiceBuilderUtil.extractRegion(iaasInfo);
+        ComputeServiceContext context = iaasInfo.getComputeService().getContext();;
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+        VolumeApi volumeApi = novaApi.getVolumeExtensionForZone(region).get();
+        Volume.Status volumeStatus = this.getVolumeStatus(volumeApi, volumeId);
+
+        while(volumeStatus != expectedStatus){
+            try {
+                if(log.isDebugEnabled()){
+                    log.debug(String.format("Volume %s is still NOT in %s. Current State=%s", volumeId, expectedStatus, volumeStatus));
+                }
+                if(volumeStatus == Volume.Status.ERROR){
+                    log.error("Volume " + volumeId + " is in state ERROR");
+                    return false;
+                }
+                Thread.sleep(1000);
+                volumeStatus = this.getVolumeStatus(volumeApi, volumeId);
+                if (System.currentTimeMillis()> timout) {
+                    throw new TimeoutException();
+                }
+            } catch (InterruptedException e) {
+                // Ignoring the exception
+            }
+        }
+        if(log.isDebugEnabled()){
+            log.debug(String.format("Volume %s status became %s", volumeId, expectedStatus));
+        }
+
+        return true;
+    }
+
+    @Override
+	public String attachVolume(String instanceId, String volumeId, String deviceName) {
+        IaasProvider iaasInfo = getIaasProvider();
+
+        if (StringUtils.isEmpty(volumeId)) {
+            log.error("Volume provided to attach can not be null");
+        }
+
+        if (StringUtils.isEmpty(instanceId)) {
+            log.error("Instance provided to attach can not be null");
+        }
+
+        ComputeServiceContext context = iaasInfo.getComputeService()
+                .getContext();
+        String region = ComputeServiceBuilderUtil.extractRegion(iaasInfo);
+        String device = deviceName == null ? "/dev/vdc" : deviceName;
+
+        if (region == null) {
+            log.fatal(String.format("Cannot attach the volume [id]: %s. Extracted region is null for Iaas : %s", volumeId, iaasInfo));
+            return null;
+        }
+
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+        VolumeApi volumeApi = novaApi.getVolumeExtensionForZone(region).get();
+        VolumeAttachmentApi volumeAttachmentApi = novaApi.getVolumeAttachmentExtensionForZone(region).get();
+
+        Volume.Status volumeStatus = this.getVolumeStatus(volumeApi, volumeId);
+
+        if (log.isDebugEnabled()) {
+            log.debug("Volume " + volumeId + " is in state " + volumeStatus);
+        }
+
+        if (!(volumeStatus == Volume.Status.AVAILABLE || volumeStatus == Volume.Status.CREATING)) {
+            log.error(String.format("Volume %s can not be attached. Volume status is %s", volumeId, volumeStatus));
+            return null;
+        }
+
+        boolean volumeBecameAvailable = false, volumeBecameAttached = false;
+        try {
+            volumeBecameAvailable = waitForStatus(volumeId, Volume.Status.AVAILABLE, 5);
+        } catch (TimeoutException e) {
+            log.error("[Volume ID] " + volumeId + "did not become AVAILABLE within expected timeout");
+        }
+
+        VolumeAttachment attachment = null;
+        if (volumeBecameAvailable) {
+            attachment = volumeAttachmentApi.attachVolumeToServerAsDevice(volumeId, instanceId, device);
+
+            try {
+                volumeBecameAttached = waitForStatus(volumeId, Volume.Status.IN_USE, 2);
+            } catch (TimeoutException e) {
+                log.error("[Volume ID] " + volumeId + "did not become IN_USE within expected timeout");
+            }
+        }
+        try {
+            // waiting 5seconds till volumes are actually attached.
+            Thread.sleep(5000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        if (attachment == null) {
+			log.fatal(String.format("Volume [id]: %s attachment for instance [id]: %s was unsuccessful. [region] : %s of Iaas : %s", volumeId, instanceId, region, iaasInfo));
+			return null;
+		}
+
+        if(! volumeBecameAttached){
+           log.error(String.format("[Volume ID] %s attachment is called, but not yet became attached", volumeId));
+        }
+
+		log.info(String.format("Volume [id]: %s attachment for instance [id]: %s was successful [status]: Attaching. [region] : %s of Iaas : %s", volumeId, instanceId, region, iaasInfo));
+		return "Attaching";
+	}
+
+	@Override
+	public void detachVolume(String instanceId, String volumeId) {
+		IaasProvider iaasInfo = getIaasProvider();
+
+		ComputeServiceContext context = iaasInfo.getComputeService()
+				.getContext();
+		
+		String region = ComputeServiceBuilderUtil.extractRegion(iaasInfo);
+		
+		if(region == null) {
+			log.fatal(String.format("Cannot detach the volume [id]: %s from the instance [id]: %s. Extracted region is null for Iaas : %s", volumeId, instanceId, iaasInfo));
+			return;
+		}
+        if(log.isDebugEnabled()) {
+            log.debug(String.format("Starting to detach volume %s from the instance %s", volumeId, instanceId));
+        }
+
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+        VolumeAttachmentApi api = novaApi.getVolumeAttachmentExtensionForZone(region).get();
+        if (api.detachVolumeFromServer(volumeId, instanceId)) {
+        	log.info(String.format("Detachment of Volume [id]: %s from instance [id]: %s was successful. [region] : %s of Iaas : %s", volumeId, instanceId, region, iaasInfo));
+        }else{
+            log.error(String.format("Detachment of Volume [id]: %s from instance [id]: %s was unsuccessful. [volume Status] : %s", volumeId, instanceId, region, iaasInfo));
+        }
+        
+	}
+
+	@Override
+	public void deleteVolume(String volumeId) {
+		IaasProvider iaasInfo = getIaasProvider();
+
+		ComputeServiceContext context = iaasInfo.getComputeService()
+				.getContext();
+		
+		String region = ComputeServiceBuilderUtil.extractRegion(iaasInfo);
+		
+		if(region == null) {
+			log.fatal(String.format("Cannot delete the volume [id]: %s. Extracted region is null for Iaas : %s", volumeId, iaasInfo));
+			return;
+		}
+
+        NovaApi novaApi = context.unwrapApi(NovaApi.class);
+		VolumeApi api = novaApi.getVolumeExtensionForZone(region).get();
+        if (api.delete(volumeId)) {
+        	log.info(String.format("Deletion of Volume [id]: %s was successful. [region] : %s of Iaas : %s", volumeId, region, iaasInfo));
+        }
+	}
+
+    @Override
+    public String getIaasDevice(String device) {
+        return device;
+    }
+
+    private Volume.Status getVolumeStatus(VolumeApi volumeApi, String volumeId){
+        return volumeApi.get(volumeId).getStatus();
+    }
+}