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Posted to commits@airavata.apache.org by sc...@apache.org on 2015/06/07 19:00:52 UTC

[11/44] airavata git commit: Adding mongo-registry WIP

http://git-wip-us.apache.org/repos/asf/airavata/blob/e13d90da/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/resources/WorkerResource.java
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diff --git a/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/resources/WorkerResource.java b/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/resources/WorkerResource.java
new file mode 100644
index 0000000..fbf7855
--- /dev/null
+++ b/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/resources/WorkerResource.java
@@ -0,0 +1,908 @@
+/*
+ *
+ * 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.airavata.persistance.registry.jpa.resources;
+
+import org.apache.airavata.model.workspace.experiment.ExperimentState;
+import org.apache.airavata.persistance.registry.jpa.Resource;
+import org.apache.airavata.persistance.registry.jpa.ResourceType;
+import org.apache.airavata.persistance.registry.jpa.ResourceUtils;
+import org.apache.airavata.persistance.registry.jpa.model.*;
+import org.apache.airavata.persistance.registry.jpa.utils.QueryGenerator;
+import org.apache.airavata.registry.cpi.ResultOrderType;
+import org.apache.airavata.registry.cpi.utils.Constants;
+import org.apache.airavata.registry.cpi.utils.StatusType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.airavata.registry.cpi.RegistryException;
+
+import javax.persistence.EntityManager;
+import javax.persistence.Query;
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+public class WorkerResource extends AbstractResource {
+    private final static Logger logger = LoggerFactory.getLogger(WorkerResource.class);
+    private String user;
+	private GatewayResource gateway;
+
+    /**
+     *
+     */
+    public WorkerResource() {
+    }
+
+    /**
+     *
+     * @param user username
+     * @param gateway  gatewayResource
+     */
+    public WorkerResource(String user, GatewayResource gateway) {
+		this.setUser(user);
+		this.gateway=gateway;
+	}
+
+    /**
+     * Gateway worker can create child data structures such as projects and user workflows
+     * @param type child resource type
+     * @return  child resource
+     */
+	public Resource create(ResourceType type) throws RegistryException{
+		Resource result = null;
+		switch (type) {
+			case PROJECT:
+				ProjectResource projectResource = new ProjectResource();
+				projectResource.setWorker(this);
+				projectResource.setGateway(gateway);
+				result=projectResource;
+				break;
+            case EXPERIMENT:
+                ExperimentResource experimentResource = new ExperimentResource();
+                experimentResource.setExecutionUser(user);
+                experimentResource.setGateway(gateway);
+                result = experimentResource;
+                break;
+			default:
+                logger.error("Unsupported resource type for worker resource.", new IllegalArgumentException());
+                throw new IllegalArgumentException("Unsupported resource type for worker resource.");
+
+		}
+		return result;
+	}
+
+    /**
+     *
+     * @param type child resource type
+     * @param name child resource name
+     */
+	public void remove(ResourceType type, Object name) throws RegistryException{
+        EntityManager em = null;
+        try {
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            Query q;
+            QueryGenerator generator;
+            switch (type) {
+                case PROJECT:
+                    generator = new QueryGenerator(PROJECT);
+                    generator.setParameter(ProjectConstants.PROJECT_ID, name);
+                    q = generator.deleteQuery(em);
+                    q.executeUpdate();
+                    break;
+                case EXPERIMENT:
+                    generator = new QueryGenerator(EXPERIMENT);
+                    generator.setParameter(ExperimentConstants.EXPERIMENT_ID, name);
+                    q = generator.deleteQuery(em);
+                    q.executeUpdate();
+                    break;
+                default:
+                    logger.error("Unsupported resource type for worker resource.", new IllegalArgumentException());
+                    break;
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e.getMessage());
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+    }
+
+    /**
+     *
+     * @param type child resource type
+     * @param name child resource name
+     * @return child resource
+     */
+	public Resource get(ResourceType type, Object name) throws RegistryException{
+        Resource result = null;
+        EntityManager em = null;
+        try {
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            QueryGenerator generator;
+            Query q;
+            switch (type) {
+                case PROJECT:
+                    generator = new QueryGenerator(PROJECT);
+                    generator.setParameter(ProjectConstants.PROJECT_ID, name);
+                    q = generator.selectQuery(em);
+                    Project project = (Project) q.getSingleResult();
+                    result = Utils.getResource(ResourceType.PROJECT, project);
+                    break;
+                case EXPERIMENT:
+                    generator = new QueryGenerator(EXPERIMENT);
+                    generator.setParameter(ExperimentConstants.EXPERIMENT_ID, name);
+                    q = generator.selectQuery(em);
+                    Experiment experiment = (Experiment) q.getSingleResult();
+                    result = Utils.getResource(ResourceType.EXPERIMENT, experiment);
+                    break;
+                default:
+                    logger.error("Unsupported resource type for worker resource.", new IllegalArgumentException());
+                    break;
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+        return result;
+    }
+
+//	public List<GFacJobDataResource> getGFacJobs(String serviceDescriptionId, String hostDescriptionId, String applicationDescriptionId){
+//		List<GFacJobDataResource> result = new ArrayList<GFacJobDataResource>();
+//        EntityManager em = ResourceUtils.getEntityManager();
+//        em.getTransaction().begin();
+//        QueryGenerator generator;
+//        Query q;
+//        generator = new QueryGenerator(GFAC_JOB_DATA);
+//        generator.setParameter(GFacJobDataConstants.SERVICE_DESC_ID, serviceDescriptionId);
+//        generator.setParameter(GFacJobDataConstants.HOST_DESC_ID, hostDescriptionId);
+//        generator.setParameter(GFacJobDataConstants.APP_DESC_ID, applicationDescriptionId);
+//        q = generator.selectQuery(em);
+//        for (Object o : q.getResultList()) {
+//            GFac_Job_Data gFacJobData = (GFac_Job_Data)o;
+//            result.add((GFacJobDataResource)Utils.getResource(ResourceType.GFAC_JOB_DATA, gFacJobData));
+//        }
+//        em.getTransaction().commit();
+//        em.close();
+//		return result;
+//	}
+//
+//	public List<GFacJobStatusResource> getGFacJobStatuses(String jobId){
+//		List<GFacJobStatusResource> resourceList = new ArrayList<GFacJobStatusResource>();
+//        EntityManager em = ResourceUtils.getEntityManager();
+//        em.getTransaction().begin();
+//        QueryGenerator generator;
+//        Query q;
+//        generator = new QueryGenerator(GFAC_JOB_STATUS);
+//        generator.setParameter(GFacJobStatusConstants.LOCAL_JOB_ID, jobId);
+//        q = generator.selectQuery(em);
+//        for (Object result : q.getResultList()) {
+//            GFac_Job_Status gFacJobStatus = (GFac_Job_Status) result;
+//            GFacJobStatusResource gFacJobStatusResource =
+//                    (GFacJobStatusResource)Utils.getResource(ResourceType.GFAC_JOB_STATUS, gFacJobStatus);
+//            resourceList.add(gFacJobStatusResource);
+//        }
+//        return resourceList;
+//	}
+
+    /**
+     * Method getExperiment all results of the given child resource type
+     *
+     * @param type child resource type
+     * @return list of child resources
+     */
+    public List<Resource> get(ResourceType type) throws RegistryException{
+        return get(type, -1, -1, null, null);
+    }
+
+    /**
+     * Method getExperiment all results of the given child resource type with paginaltion and ordering
+     *
+     * @param type child resource type
+     * @param limit
+     * @param offset
+     * @param orderByIdentifier
+     * @param resultOrderType
+     * @return list of child resources
+     * @throws RegistryException
+     */
+    public List<Resource> get(ResourceType type, int limit, int offset, Object orderByIdentifier,
+                              ResultOrderType resultOrderType) throws RegistryException{
+        List<Resource> result = new ArrayList<Resource>();
+        EntityManager em = null;
+        try {
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            QueryGenerator generator;
+            Query q;
+            switch (type) {
+                case PROJECT:
+                    generator = new QueryGenerator(PROJECT);
+                    Users users = em.find(Users.class, getUser());
+                    Gateway gatewayModel = em.find(Gateway.class, gateway.getGatewayId());
+                    generator.setParameter("users", users);
+                    generator.setParameter("gateway", gatewayModel);
+
+                    //ordering - only supported only by CREATION_TIME
+                    if(orderByIdentifier != null && resultOrderType != null
+                            && orderByIdentifier.equals(Constants.FieldConstants.ProjectConstants.CREATION_TIME)) {
+                        q = generator.selectQuery(em, ProjectConstants.CREATION_TIME, resultOrderType);
+                    }else{
+                        q = generator.selectQuery(em);
+                    }
+
+                    //pagination
+                    if(limit>0 && offset>=0){
+                        q.setFirstResult(offset);
+                        q.setMaxResults(limit);
+                    }
+
+                    for (Object o : q.getResultList()) {
+                        Project project = (Project) o;
+                        ProjectResource projectResource = (ProjectResource) Utils.getResource(ResourceType.PROJECT, project);
+                        result.add(projectResource);
+                    }
+                    break;
+                case EXPERIMENT:
+                    generator = new QueryGenerator(EXPERIMENT);
+                    generator.setParameter(ExperimentConstants.EXECUTION_USER, getUser());
+
+                    //ordering - only supported only by CREATION_TIME
+                    if(orderByIdentifier != null && resultOrderType != null
+                            && orderByIdentifier.equals(Constants.FieldConstants.ProjectConstants.CREATION_TIME)) {
+                        q = generator.selectQuery(em, ExperimentConstants.CREATION_TIME, resultOrderType);
+                    }else{
+                        q = generator.selectQuery(em);
+                    }
+
+                    //pagination
+                    if(limit>0 && offset>=0){
+                        q.setFirstResult(offset);
+                        q.setMaxResults(limit);
+                    }
+                    for (Object o : q.getResultList()) {
+                        Experiment experiment = (Experiment) o;
+                        ExperimentResource experimentResource = (ExperimentResource) Utils.getResource(ResourceType.EXPERIMENT, experiment);
+                        result.add(experimentResource);
+                    }
+
+                    break;
+                default:
+                    logger.error("Unsupported resource type for worker resource.", new IllegalArgumentException());
+                    break;
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+        return result;
+    }
+
+    /**
+     * saveExperiment gateway worker to database
+     */
+	public void save() throws RegistryException{
+        EntityManager em = null;
+        try {
+            em = ResourceUtils.getEntityManager();
+            Gateway_Worker existingWorker = em.find(Gateway_Worker.class, new Gateway_Worker_PK(gateway.getGatewayId(), user));
+            em.close();
+
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            Gateway_Worker gatewayWorker = new Gateway_Worker();
+            Users existingUser = em.find(Users.class, this.user);
+            gatewayWorker.setUser(existingUser);
+            gatewayWorker.setUser_name(existingUser.getUser_name());
+            Gateway gatewaymodel = em.find(Gateway.class, gateway.getGatewayId());
+            gatewayWorker.setGateway(gatewaymodel);
+            gatewayWorker.setGateway_id(gatewaymodel.getGateway_id());
+            if (existingWorker != null) {
+                existingWorker.setUser_name(existingUser.getUser_name());
+                existingWorker.setUser(existingUser);
+                existingWorker.setGateway(gatewaymodel);
+                existingWorker.setGateway_id(gatewaymodel.getGateway_id());
+                gatewayWorker = em.merge(existingWorker);
+            } else {
+                em.persist(gatewayWorker);
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+    }
+
+    /**
+     *
+     * @return user name
+     */
+	public String getUser() {
+		return user;
+	}
+
+    /**
+     *
+     * @param user user name
+     */
+    public void setUser(String user) {
+		this.user = user;
+	}
+
+    /**
+     *
+     * @return gateway resource
+     */
+    public GatewayResource getGateway() {
+        return gateway;
+    }
+
+    /**
+     *
+     * @param gateway  gateway resource
+     */
+    public void setGateway(GatewayResource gateway) {
+        this.gateway = gateway;
+    }
+
+    /**
+     *
+     * @param id  project id
+     * @return whether the project is available under the user
+     */
+    public boolean isProjectExists(String id) throws RegistryException{
+		return isExists(ResourceType.PROJECT, id);
+	}
+
+    /**
+     *
+     * @param projectId project id
+     * @return project resource for the user
+     */
+	public ProjectResource createProject(String projectId) throws RegistryException{
+		ProjectResource project=(ProjectResource)create(ResourceType.PROJECT);
+        project.setId(projectId);
+		return project;
+	}
+
+    public String getProjectId(String projectName) {
+        String pro = projectName.replaceAll("\\s", "");
+        return pro + "_" + UUID.randomUUID();
+    }
+
+    /**
+     *
+     * @param id project id
+     * @return project resource
+     */
+	public ProjectResource getProject(String id) throws RegistryException{
+		return (ProjectResource)get(ResourceType.PROJECT, id);
+	}
+
+    /**
+     *
+     * @param id project id
+     */
+	public void removeProject(String id) throws RegistryException{
+		remove(ResourceType.PROJECT, id);
+	}
+
+    /**
+     * Get projects list of user
+     * @return  list of projects for the user
+     */
+    public List<ProjectResource> getProjects() throws RegistryException{
+		return getProjects(-1, -1, null, null);
+	}
+
+
+    /**
+     * Get projects list of user with pagination and ordering
+     *
+     * @return  list of projects for the user
+     */
+    public List<ProjectResource> getProjects(int limit, int offset, Object orderByIdentifier,
+                                             ResultOrderType resultOrderType) throws RegistryException{
+        List<ProjectResource> result=new ArrayList<ProjectResource>();
+        List<Resource> list = get(ResourceType.PROJECT, limit, offset, orderByIdentifier, resultOrderType);
+        for (Resource resource : list) {
+            result.add((ProjectResource) resource);
+        }
+        return result;
+    }
+
+    /**
+     *
+     * @param name experiment name
+     * @return whether experiment is already exist for the given user
+     */
+	public boolean isExperimentExists(String name) throws RegistryException{
+		return isExists(ResourceType.EXPERIMENT, name);
+	}
+	
+
+    /**
+     *
+     * @param name experiment name
+     * @return experiment resource
+     */
+    public ExperimentResource getExperiment(String name) throws RegistryException{
+		return (ExperimentResource)get(ResourceType.EXPERIMENT, name);
+	}
+//
+//    public GFacJobDataResource getGFacJob(String jobId){
+//    	return (GFacJobDataResource)getExperiment(ResourceType.GFAC_JOB_DATA,jobId);
+//    }
+
+    /**
+     * Method to getExperiment list of expeirments of user
+     * @return list of experiments for the user
+     */
+	public List<ExperimentResource> getExperiments() throws RegistryException{
+		return getExperiments(-1, -1, null, null);
+	}
+
+    /**
+     * Method to getExperiment list of experiments of user with pagination and ordering
+     * @param limit
+     * @param offset
+     * @param orderByIdentifier
+     * @param resultOrderType
+     * @return
+     * @throws RegistryException
+     */
+    public List<ExperimentResource> getExperiments(int limit, int offset, Object orderByIdentifier,
+                                                   ResultOrderType resultOrderType) throws RegistryException{
+        List<ExperimentResource> result=new ArrayList<ExperimentResource>();
+        List<Resource> list = get(ResourceType.EXPERIMENT, limit, offset, orderByIdentifier, resultOrderType);
+        for (Resource resource : list) {
+            result.add((ExperimentResource) resource);
+        }
+        return result;
+    }
+
+    /**
+     *
+     * @param experimentId  experiment name
+     */
+	public void removeExperiment(String experimentId) throws RegistryException{
+		remove(ResourceType.EXPERIMENT, experimentId);
+	}
+
+    /**
+     * To search projects of user with the given filter criteria. All the matching results will be sent.
+     * Results are not ordered in any order
+     * @param filters
+     * @return
+     * @throws RegistryException
+     */
+    public List<ProjectResource> searchProjects (Map<String, String> filters) throws RegistryException{
+        return searchProjects(filters, -1, -1, null, null);
+    }
+
+    /**
+     * To search the projects of user with the given filter criteria and retrieve the results with
+     * pagination support. Results can be ordered based on an identifier (i.e column) either ASC or
+     * DESC. But in the current implementation ordering is only supported based on the project
+     * creation time
+     *
+     * @param filters
+     * @param limit
+     * @param offset
+     * @param orderByIdentifier
+     * @param resultOrderType
+     * @return
+     * @throws RegistryException
+     */
+    public List<ProjectResource> searchProjects(Map<String, String> filters, int limit,
+             int offset, Object orderByIdentifier, ResultOrderType resultOrderType) throws RegistryException {
+        List<ProjectResource> result = new ArrayList<ProjectResource>();
+        EntityManager em = null;
+        try {
+            String query = "SELECT p from Project p WHERE ";
+            if (filters != null && filters.size() != 0) {
+                for (String field : filters.keySet()) {
+                    String filterVal = filters.get(field);
+                    if (field.equals(ProjectConstants.USERNAME)) {
+                        query += "p." + field + "= '" + filterVal + "' AND ";
+                    }else if (field.equals(ProjectConstants.GATEWAY_ID)) {
+                        query += "p." + field + "= '" + filterVal + "' AND ";
+                    }else {
+                        if (filterVal.contains("*")){
+                            filterVal = filterVal.replaceAll("\\*", "");
+                        }
+                        query += "p." + field + " LIKE '%" + filterVal + "%' AND ";
+                    }
+                }
+            }
+            query = query.substring(0, query.length() - 5);
+
+            //ordering
+            if( orderByIdentifier != null && resultOrderType != null
+                    && orderByIdentifier.equals(Constants.FieldConstants.ProjectConstants.CREATION_TIME)){
+                String order = (resultOrderType == ResultOrderType.ASC) ? "ASC" : "DESC";
+                query += " ORDER BY p." + ProjectConstants.CREATION_TIME + " " + order;
+            }
+
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            Query q;
+
+            //pagination
+            if(offset>=0 && limit >=0){
+                q = em.createQuery(query).setFirstResult(offset).setMaxResults(limit);
+            }else{
+                q = em.createQuery(query);
+            }
+
+            List resultList = q.getResultList();
+            for (Object o : resultList) {
+                Project project = (Project) o;
+                ProjectResource projectResource =
+                        (ProjectResource) Utils.getResource(ResourceType.PROJECT, project);
+                result.add(projectResource);
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+        return result;
+    }
+
+    /**
+     * To search experiments of user with the given filter criteria. All the matching results will be sent.
+     * Results are not ordered in any order
+     * @param filters
+     * @return
+     * @throws RegistryException
+     */
+    public List<ExperimentResource> searchExperiments (Map<String, String> filters) throws RegistryException{
+        return searchExperiments(filters, -1, -1, null, null);
+    }
+
+    /**
+     * To search the experiments of user with the given filter criteria and retrieve the results with
+     * pagination support. Results can be ordered based on an identifier (i.e column) either ASC or
+     * DESC. But in the current implementation ordering is only supported based on creationTime
+     *
+     * @param filters
+     * @param limit
+     * @param offset
+     * @param orderByIdentifier
+     * @param resultOrderType
+     * @return
+     * @throws RegistryException
+     */
+    public List<ExperimentResource> searchExperiments(Map<String, String> filters, int limit,
+                                                      int offset, Object orderByIdentifier, ResultOrderType resultOrderType) throws RegistryException {
+
+        List<ExperimentResource> result = new ArrayList<ExperimentResource>();
+        EntityManager em = null;
+        try {
+            String query = "SELECT e from Experiment e WHERE ";
+            if (filters != null && filters.size() != 0) {
+                for (String field : filters.keySet()) {
+                    String filterVal = filters.get(field);
+                    if (field.equals(ExperimentConstants.EXECUTION_USER)) {
+                        query += "e." + field + "= '" + filterVal + "' AND ";
+                    }else if (field.equals(ExperimentConstants.GATEWAY_ID)) {
+                        query += "e." + field + "= '" + filterVal + "' AND ";
+                    } else if (field.equals(ExperimentConstants.PROJECT_ID)) {
+                        query += "e." + field + "= '" + filterVal + "' AND ";
+                    } else {
+                        if (filterVal.contains("*")){
+                            filterVal = filterVal.replaceAll("\\*", "");
+                        }
+                        query += "e." + field + " LIKE '%" + filterVal + "%' AND ";
+                    }
+                }
+            }
+            query = query.substring(0, query.length() - 5);
+
+            //ordering
+            if( orderByIdentifier != null && resultOrderType != null
+                    && orderByIdentifier.equals(Constants.FieldConstants.ExperimentConstants.CREATION_TIME)){
+                String order = (resultOrderType == ResultOrderType.ASC) ? "ASC" : "DESC";
+                query += " ORDER BY e." + ExperimentConstants.CREATION_TIME + " " + order;
+            }
+
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            Query q;
+
+            //pagination
+            if(offset>=0 && limit >=0){
+                q = em.createQuery(query).setFirstResult(offset).setMaxResults(limit);
+            }else{
+                q = em.createQuery(query);
+            }
+
+            List resultList = q.getResultList();
+            for (Object o : resultList) {
+                Experiment experiment = (Experiment) o;
+                ExperimentResource experimentResource =
+                        (ExperimentResource) Utils.getResource(ResourceType.EXPERIMENT, experiment);
+                result.add(experimentResource);
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Method to getExperiment experiments by state
+     * @param filters
+     * @return
+     * @throws RegistryException
+     */
+    public List<ExperimentResource> searchExperimentsByState (Map<String, String> filters) throws RegistryException{
+        return searchExperimentsByState(filters, -1, -1, null, null);
+    }
+
+    /**
+     * Method to getExperiment experiments of the given state with pagination and ordering
+     * @param filters
+     * @param limit
+     * @param offset
+     * @param orderByIdentifier
+     * @param resultOrderType
+     * @return
+     * @throws RegistryException
+     */
+    public List<ExperimentResource> searchExperimentsByState (Map<String, String> filters, int limit, int offset,
+            Object orderByIdentifier, ResultOrderType resultOrderType) throws RegistryException{
+        List<ExperimentResource> result = new ArrayList<ExperimentResource>();
+        EntityManager em = null;
+        try {
+            String experimentState = ExperimentState.valueOf(filters.get(StatusConstants.STATE)).toString();
+            String query = "SELECT e FROM Status s " +
+                    "JOIN s.experiment e " +
+                    "WHERE s.state='" + experimentState +  "' " +
+                    "AND s.statusType='" + StatusType.EXPERIMENT + "' AND ";
+
+            filters.remove(StatusConstants.STATE);
+            if (filters.size() != 0) {
+                for (String field : filters.keySet()) {
+                    String filterVal = filters.get(field);
+                    if (field.equals(ExperimentConstants.EXECUTION_USER)) {
+                        query += "e." + field + "= '" + filterVal + "' AND ";
+                    }else if (field.equals(ExperimentConstants.GATEWAY_ID)) {
+                        query += "e." + field + "= '" + filterVal + "' AND ";
+                    } else if (field.equals(ExperimentConstants.PROJECT_ID)) {
+                        query += "e." + field + "= '" + filterVal + "' AND ";
+                    } else {
+                        if (filterVal.contains("*")){
+                            filterVal = filterVal.replaceAll("\\*", "");
+                        }
+                        query += "e." + field + " LIKE '%" + filterVal + "%' AND ";
+                    }
+                }
+            }
+            query = query.substring(0, query.length() - 5);
+
+            //ordering
+            if( orderByIdentifier != null && resultOrderType != null
+                    && orderByIdentifier.equals(Constants.FieldConstants.ExperimentConstants.CREATION_TIME)){
+                String order = (resultOrderType == ResultOrderType.ASC) ? "ASC" : "DESC";
+                query += " ORDER BY e." + ExperimentConstants.CREATION_TIME + " " + order;
+            }
+
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            Query q;
+
+            //pagination
+            if(offset>=0 && limit >=0){
+                q = em.createQuery(query).setFirstResult(offset).setMaxResults(limit);
+            }else{
+                q = em.createQuery(query);
+            }
+
+            List resultList = q.getResultList();
+            for (Object o : resultList) {
+                Experiment experiment = (Experiment) o;
+                ExperimentResource experimentResource = (ExperimentResource) Utils.getResource(ResourceType.EXPERIMENT, experiment);
+                result.add(experimentResource);
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Search experiments from creation time between interval. Returns all results
+     * @param fromTime
+     * @param toTime
+     * @return
+     * @throws RegistryException
+     */
+    public List<ExperimentResource> searchExperimentsByCreationTime (Timestamp fromTime, Timestamp toTime) throws RegistryException{
+        return  searchExperimentsByCreationTime(fromTime, toTime, -1, -1, null, null);
+    }
+
+
+    /**
+     * Search experiments from creation time between interval. Results are ordered creation time DESC.
+     * Supports pagination
+     *
+     * @param fromTime
+     * @param toTime
+     * @param limit
+     * @param offset
+     * @param orderByIdentifier
+     * @param resultOrderType
+     * @return
+     * @throws RegistryException
+     */
+    public List<ExperimentResource> searchExperimentsByCreationTime(
+            Timestamp fromTime, Timestamp toTime, int limit, int offset, Object orderByIdentifier,
+            ResultOrderType resultOrderType) throws RegistryException{
+
+        List<ExperimentResource> result = new ArrayList<ExperimentResource>();
+        EntityManager em = null;
+        try {
+            String query = "SELECT e FROM Experiment e " +
+                    "WHERE e.creationTime > '" + fromTime +  "' " +
+                    "AND e.creationTime <'" + toTime + "'";
+
+            //ordering
+            if( orderByIdentifier != null && resultOrderType != null
+                    && orderByIdentifier.equals(Constants.FieldConstants.ExperimentConstants.CREATION_TIME)){
+                String order = (resultOrderType == ResultOrderType.ASC) ? "ASC" : "DESC";
+                query += " ORDER BY e." + ExperimentConstants.CREATION_TIME + " " + order;
+            }
+
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            Query q;
+
+            //pagination
+            if(offset>=0 && limit >=0){
+                q = em.createQuery(query).setFirstResult(offset).setMaxResults(limit);
+            }else{
+                q = em.createQuery(query);
+            }
+
+            List resultList = q.getResultList();
+            for (Object o : resultList) {
+                Experiment experiment = (Experiment) o;
+                ExperimentResource experimentResource = (ExperimentResource) Utils.getResource(ResourceType.EXPERIMENT, experiment);
+                result.add(experimentResource);
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+        return result;
+    }
+
+    /**
+     *
+     * @return list of experiments for the user
+     */
+    public List<ExperimentResource> getExperimentsByCaching(String user) throws RegistryException{
+        List<ExperimentResource> result = new ArrayList<ExperimentResource>();
+        EntityManager em = null;
+        try {
+            String query = "SELECT e from Experiment e WHERE e.executionUser = '" + user + "'";
+            em = ResourceUtils.getEntityManager();
+//        OpenJPAEntityManagerFactory oemf = OpenJPAPersistence.cast(em.getEntityManagerFactory());
+//        QueryResultCache qcache = oemf.getQueryResultCache();
+            // qcache.evictAll(Experiment.class);
+            em.getTransaction().begin();
+            Query q = em.createQuery(query);
+            List resultList = q.getResultList();
+            for (Object o : resultList) {
+                Experiment experiment = (Experiment) o;
+                ExperimentResource experimentResource = (ExperimentResource) Utils.getResource(ResourceType.EXPERIMENT, experiment);
+                result.add(experimentResource);
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+        return result;
+    }
+}

http://git-wip-us.apache.org/repos/asf/airavata/blob/e13d90da/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/resources/WorkflowNodeDetailResource.java
----------------------------------------------------------------------
diff --git a/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/resources/WorkflowNodeDetailResource.java b/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/resources/WorkflowNodeDetailResource.java
new file mode 100644
index 0000000..9d2869d
--- /dev/null
+++ b/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/resources/WorkflowNodeDetailResource.java
@@ -0,0 +1,473 @@
+/*
+ *
+ * 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.airavata.persistance.registry.jpa.resources;
+
+import org.apache.airavata.persistance.registry.jpa.Resource;
+import org.apache.airavata.persistance.registry.jpa.ResourceType;
+import org.apache.airavata.persistance.registry.jpa.ResourceUtils;
+import org.apache.airavata.persistance.registry.jpa.model.*;
+import org.apache.airavata.persistance.registry.jpa.utils.QueryGenerator;
+import org.apache.airavata.registry.cpi.utils.StatusType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.airavata.registry.cpi.RegistryException;
+
+import javax.persistence.EntityManager;
+import javax.persistence.Query;
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.List;
+
+public class WorkflowNodeDetailResource extends AbstractResource {
+    private static final Logger logger = LoggerFactory.getLogger(WorkflowNodeDetailResource.class);
+    private ExperimentResource experimentResource;
+    private String nodeInstanceId;
+    private Timestamp creationTime;
+    private String nodeName;
+    private String executionUnit;
+    private String executionUnitData;
+
+    public ExperimentResource getExperimentResource() {
+        return experimentResource;
+    }
+
+    public void setExperimentResource(ExperimentResource experimentResource) {
+        this.experimentResource = experimentResource;
+    }
+
+    public String getNodeInstanceId() {
+        return nodeInstanceId;
+    }
+
+    public void setNodeInstanceId(String nodeInstanceId) {
+        this.nodeInstanceId = nodeInstanceId;
+    }
+
+    public Timestamp getCreationTime() {
+        return creationTime;
+    }
+
+    public void setCreationTime(Timestamp creationTime) {
+        this.creationTime = creationTime;
+    }
+
+    public String getNodeName() {
+        return nodeName;
+    }
+
+    public void setNodeName(String nodeName) {
+        this.nodeName = nodeName;
+    }
+
+    public Resource create(ResourceType type) throws RegistryException{
+        switch (type){
+            case TASK_DETAIL:
+                TaskDetailResource taskDetailResource = new TaskDetailResource();
+                taskDetailResource.setWorkflowNodeDetailResource(this);
+                return taskDetailResource;
+            case ERROR_DETAIL:
+                ErrorDetailResource errorDetailResource = new ErrorDetailResource();
+                errorDetailResource.setNodeDetail(this);
+                return errorDetailResource;
+            case NODE_INPUT:
+                NodeInputResource nodeInputResource = new NodeInputResource();
+                nodeInputResource.setNodeDetailResource(this);
+                return nodeInputResource;
+            case NODE_OUTPUT:
+                NodeOutputResource nodeOutputResource = new NodeOutputResource();
+                nodeOutputResource.setNodeDetailResource(this);
+                return nodeOutputResource;
+            case STATUS:
+                StatusResource statusResource = new StatusResource();
+                statusResource.setWorkflowNodeDetail(this);
+                return statusResource;
+            default:
+                logger.error("Unsupported resource type for workflow node detail resource.", new IllegalArgumentException());
+                throw new IllegalArgumentException("Unsupported resource type for workflow node detail resource.");
+        }
+    }
+
+    public void remove(ResourceType type, Object name) throws RegistryException{
+        EntityManager em = null;
+        try {
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            Query q;
+            QueryGenerator generator;
+            switch (type) {
+                case TASK_DETAIL:
+                    generator = new QueryGenerator(TASK_DETAIL);
+                    generator.setParameter(TaskDetailConstants.TASK_ID, name);
+                    q = generator.deleteQuery(em);
+                    q.executeUpdate();
+                    break;
+                case ERROR_DETAIL:
+                    generator = new QueryGenerator(ERROR_DETAIL);
+                    generator.setParameter(ErrorDetailConstants.NODE_INSTANCE_ID, name);
+                    q = generator.deleteQuery(em);
+                    q.executeUpdate();
+                    break;
+                case NODE_INPUT:
+                    generator = new QueryGenerator(NODE_INPUT);
+                    generator.setParameter(NodeInputConstants.NODE_INSTANCE_ID, name);
+                    q = generator.deleteQuery(em);
+                    q.executeUpdate();
+                    break;
+                case NODE_OUTPUT:
+                    generator = new QueryGenerator(NODE_OUTPUT);
+                    generator.setParameter(NodeOutputConstants.NODE_INSTANCE_ID, name);
+                    q = generator.deleteQuery(em);
+                    q.executeUpdate();
+                    break;
+                case STATUS:
+                    generator = new QueryGenerator(STATUS);
+                    generator.setParameter(StatusConstants.NODE_INSTANCE_ID, name);
+                    generator.setParameter(StatusConstants.STATUS_TYPE, StatusType.WORKFLOW_NODE.toString());
+                    q = generator.deleteQuery(em);
+                    q.executeUpdate();
+                    break;
+                default:
+                    logger.error("Unsupported resource type for experiment resource.", new IllegalArgumentException());
+                    break;
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+    }
+
+    public Resource get(ResourceType type, Object name) throws RegistryException{
+        EntityManager em = null;
+        try {
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            QueryGenerator generator;
+            Query q;
+            switch (type) {
+                case TASK_DETAIL:
+                    generator = new QueryGenerator(TASK_DETAIL);
+                    generator.setParameter(TaskDetailConstants.TASK_ID, name);
+                    q = generator.selectQuery(em);
+                    TaskDetail taskDetail = (TaskDetail) q.getSingleResult();
+                    TaskDetailResource taskDetailResource = (TaskDetailResource) Utils.getResource(ResourceType.TASK_DETAIL, taskDetail);
+                    em.getTransaction().commit();
+                    em.close();
+                    return taskDetailResource;
+                case ERROR_DETAIL:
+                    generator = new QueryGenerator(ERROR_DETAIL);
+                    generator.setParameter(ErrorDetailConstants.NODE_INSTANCE_ID, name);
+                    q = generator.selectQuery(em);
+                    ErrorDetail errorDetail = (ErrorDetail) q.getSingleResult();
+                    ErrorDetailResource errorDetailResource = (ErrorDetailResource) Utils.getResource(ResourceType.ERROR_DETAIL, errorDetail);
+                    em.getTransaction().commit();
+                    em.close();
+                    return errorDetailResource;
+                case NODE_INPUT:
+                    generator = new QueryGenerator(NODE_INPUT);
+                    generator.setParameter(NodeInputConstants.NODE_INSTANCE_ID, name);
+                    q = generator.selectQuery(em);
+                    NodeInput nodeInput = (NodeInput) q.getSingleResult();
+                    NodeInputResource nodeInputResource = (NodeInputResource) Utils.getResource(ResourceType.NODE_INPUT, nodeInput);
+                    em.getTransaction().commit();
+                    em.close();
+                    return nodeInputResource;
+                case NODE_OUTPUT:
+                    generator = new QueryGenerator(NODE_OUTPUT);
+                    generator.setParameter(NodeOutputConstants.NODE_INSTANCE_ID, name);
+                    q = generator.selectQuery(em);
+                    NodeOutput nodeOutput = (NodeOutput) q.getSingleResult();
+                    NodeOutputResource nodeOutputResource = (NodeOutputResource) Utils.getResource(ResourceType.NODE_OUTPUT, nodeOutput);
+                    em.getTransaction().commit();
+                    em.close();
+                    return nodeOutputResource;
+                case STATUS:
+                    generator = new QueryGenerator(STATUS);
+                    generator.setParameter(StatusConstants.NODE_INSTANCE_ID, name);
+                    generator.setParameter(StatusConstants.STATUS_TYPE, StatusType.WORKFLOW_NODE.toString());
+                    q = generator.selectQuery(em);
+                    Status status = (Status) q.getSingleResult();
+                    StatusResource statusResource = (StatusResource) Utils.getResource(ResourceType.STATUS, status);
+                    em.getTransaction().commit();
+                    em.close();
+                    return statusResource;
+                default:
+                    em.getTransaction().commit();
+                    em.close();
+                    logger.error("Unsupported resource type for workflow node resource.", new IllegalArgumentException());
+                    throw new IllegalArgumentException("Unsupported resource type for workflow node resource.");
+            }
+        } catch (Exception e) {
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+    }
+
+    public List<Resource> get(ResourceType type) throws RegistryException{
+        List<Resource> resourceList = new ArrayList<Resource>();
+        EntityManager em = null;
+        try {
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            Query q;
+            QueryGenerator generator;
+            List results;
+            switch (type) {
+                case TASK_DETAIL:
+                    generator = new QueryGenerator(TASK_DETAIL);
+                    generator.setParameter(TaskDetailConstants.NODE_INSTANCE_ID, nodeInstanceId);
+                    q = generator.selectQuery(em);
+                    results = q.getResultList();
+                    if (results.size() != 0) {
+                        for (Object result : results) {
+                            TaskDetail taskDetail = (TaskDetail) result;
+                            TaskDetailResource taskDetailResource =
+                                    (TaskDetailResource) Utils.getResource(ResourceType.TASK_DETAIL, taskDetail);
+                            resourceList.add(taskDetailResource);
+                        }
+                    }
+                    break;
+                case ERROR_DETAIL:
+                    generator = new QueryGenerator(ERROR_DETAIL);
+                    generator.setParameter(ErrorDetailConstants.NODE_INSTANCE_ID, nodeInstanceId);
+                    q = generator.selectQuery(em);
+                    results = q.getResultList();
+                    if (results.size() != 0) {
+                        for (Object result : results) {
+                            ErrorDetail errorDetail = (ErrorDetail) result;
+                            ErrorDetailResource errorDetailResource =
+                                    (ErrorDetailResource) Utils.getResource(ResourceType.ERROR_DETAIL, errorDetail);
+                            resourceList.add(errorDetailResource);
+                        }
+                    }
+                    break;
+                case NODE_INPUT:
+                    generator = new QueryGenerator(NODE_INPUT);
+                    generator.setParameter(NodeInputConstants.NODE_INSTANCE_ID, nodeInstanceId);
+                    q = generator.selectQuery(em);
+                    results = q.getResultList();
+                    if (results.size() != 0) {
+                        for (Object result : results) {
+                            NodeInput nodeInput = (NodeInput) result;
+                            NodeInputResource nodeInputResource =
+                                    (NodeInputResource) Utils.getResource(ResourceType.NODE_INPUT, nodeInput);
+                            resourceList.add(nodeInputResource);
+                        }
+                    }
+                    break;
+                case NODE_OUTPUT:
+                    generator = new QueryGenerator(NODE_OUTPUT);
+                    generator.setParameter(NodeOutputConstants.NODE_INSTANCE_ID, nodeInstanceId);
+                    q = generator.selectQuery(em);
+                    results = q.getResultList();
+                    if (results.size() != 0) {
+                        for (Object result : results) {
+                            NodeOutput nodeOutput = (NodeOutput) result;
+                            NodeOutputResource nodeOutputResource =
+                                    (NodeOutputResource) Utils.getResource(ResourceType.NODE_OUTPUT, nodeOutput);
+                            resourceList.add(nodeOutputResource);
+                        }
+                    }
+                    break;
+                case STATUS:
+                    generator = new QueryGenerator(STATUS);
+                    generator.setParameter(StatusConstants.NODE_INSTANCE_ID, nodeInstanceId);
+                    q = generator.selectQuery(em);
+                    results = q.getResultList();
+                    if (results.size() != 0) {
+                        for (Object result : results) {
+                            Status status = (Status) result;
+                            StatusResource statusResource =
+                                    (StatusResource) Utils.getResource(ResourceType.STATUS, status);
+                            resourceList.add(statusResource);
+                        }
+                    }
+                    break;
+                default:
+                    em.getTransaction().commit();
+                    em.close();
+                    logger.error("Unsupported resource type for workflow node details resource.", new UnsupportedOperationException());
+                    throw new UnsupportedOperationException();
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+//            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+        return resourceList;
+    }
+
+    public void save() throws RegistryException{
+        EntityManager em = null;
+        try {
+            em = ResourceUtils.getEntityManager();
+            WorkflowNodeDetail existingNode = em.find(WorkflowNodeDetail.class, nodeInstanceId);
+            em.close();
+
+            em = ResourceUtils.getEntityManager();
+            em.getTransaction().begin();
+            WorkflowNodeDetail workflowNodeDetail = new WorkflowNodeDetail();
+            workflowNodeDetail.setNodeId(nodeInstanceId);
+            Experiment experiment = em.find(Experiment.class, experimentResource.getExpID());
+            workflowNodeDetail.setExperiment(experiment);
+            workflowNodeDetail.setExpId(experimentResource.getExpID());
+            workflowNodeDetail.setCreationTime(creationTime);
+            workflowNodeDetail.setNodeName(nodeName);
+            workflowNodeDetail.setExecutionUnit(getExecutionUnit());
+            workflowNodeDetail.setExecutionUnitData(getExecutionUnitData());
+
+            if (existingNode != null) {
+                existingNode.setExperiment(experiment);
+                existingNode.setExpId(experimentResource.getExpID());
+                existingNode.setCreationTime(creationTime);
+                existingNode.setNodeName(nodeName);
+                existingNode.setExecutionUnit(getExecutionUnit());
+                existingNode.setExecutionUnitData(getExecutionUnitData());
+                workflowNodeDetail = em.merge(existingNode);
+            } else {
+                em.persist(workflowNodeDetail);
+            }
+            em.getTransaction().commit();
+            em.close();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+            throw new RegistryException(e);
+        } finally {
+            if (em != null && em.isOpen()) {
+                if (em.getTransaction().isActive()){
+                    em.getTransaction().rollback();
+                }
+                em.close();
+            }
+        }
+    }
+
+    public List<NodeInputResource> getNodeInputs() throws RegistryException{
+        List<NodeInputResource> nodeInputResourceList = new ArrayList<NodeInputResource>();
+        List<Resource> resources = get(ResourceType.NODE_INPUT);
+        for (Resource resource : resources) {
+            NodeInputResource nodeInputResource = (NodeInputResource) resource;
+            nodeInputResourceList.add(nodeInputResource);
+        }
+        return nodeInputResourceList;
+    }
+
+    public List<NodeOutputResource> getNodeOutputs() throws RegistryException{
+        List<NodeOutputResource> outputResources = new ArrayList<NodeOutputResource>();
+        List<Resource> resources = get(ResourceType.NODE_OUTPUT);
+        for (Resource resource : resources) {
+            NodeOutputResource nodeOutputResource = (NodeOutputResource) resource;
+            outputResources.add(nodeOutputResource);
+        }
+        return outputResources;
+    }
+
+    public StatusResource getWorkflowNodeStatus() throws RegistryException{
+        List<Resource> resources = get(ResourceType.STATUS);
+        for (Resource resource : resources) {
+            StatusResource nodeStatus = (StatusResource) resource;
+            if(nodeStatus.getStatusType().equals(StatusType.WORKFLOW_NODE.toString())){
+                if (nodeStatus.getState() == null || nodeStatus.getState().equals("") ){
+                    nodeStatus.setState("UNKNOWN");
+                }
+                return nodeStatus;
+            }
+        }
+        return null;
+    }
+
+    public StatusResource getTaskStatus(String taskId) throws RegistryException{
+        List<Resource> resources = get(ResourceType.STATUS);
+        for (Resource resource : resources) {
+            StatusResource taskStatus = (StatusResource) resource;
+            if(taskStatus.getStatusType().equals(StatusType.TASK.toString()) && taskStatus.getTaskDetailResource().getTaskId().equals(taskId)){
+                if (taskStatus.getState() == null || taskStatus.getState().equals("") ){
+                    taskStatus.setState("UNKNOWN");
+                }
+                return taskStatus;
+            } 
+        }
+        return null;
+    }
+
+    public List<TaskDetailResource> getTaskDetails() throws RegistryException{
+        List<TaskDetailResource> taskDetailResources = new ArrayList<TaskDetailResource>();
+        List<Resource> resources = get(ResourceType.TASK_DETAIL);
+        for (Resource resource : resources) {
+            TaskDetailResource taskDetailResource = (TaskDetailResource) resource;
+            taskDetailResources.add(taskDetailResource);
+        }
+        return taskDetailResources;
+    }
+
+    public List<ErrorDetailResource> getErrorDetails() throws RegistryException{
+        List<ErrorDetailResource> errorDetails = new ArrayList<ErrorDetailResource>();
+        List<Resource> resources = get(ResourceType.ERROR_DETAIL);
+        for (Resource resource : resources) {
+            ErrorDetailResource errorDetailResource = (ErrorDetailResource) resource;
+            errorDetails.add(errorDetailResource);
+        }
+        return errorDetails;
+    }
+
+    public TaskDetailResource getTaskDetail(String taskId) throws RegistryException{
+        return (TaskDetailResource)get(ResourceType.TASK_DETAIL, taskId);
+    }
+
+	public String getExecutionUnit() {
+		return executionUnit;
+	}
+
+	public void setExecutionUnit(String executionUnit) {
+		this.executionUnit = executionUnit;
+	}
+
+	public String getExecutionUnitData() {
+		return executionUnitData;
+	}
+
+	public void setExecutionUnitData(String executionUnitData) {
+		this.executionUnitData = executionUnitData;
+	}
+}

http://git-wip-us.apache.org/repos/asf/airavata/blob/e13d90da/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/utils/QueryGenerator.java
----------------------------------------------------------------------
diff --git a/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/utils/QueryGenerator.java b/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/utils/QueryGenerator.java
new file mode 100644
index 0000000..b0ebe45
--- /dev/null
+++ b/modules/registry/airavata-mongo-registry/src/main/java/org/apache/airavata/persistance/registry/jpa/utils/QueryGenerator.java
@@ -0,0 +1,128 @@
+/*
+ *
+ * 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.airavata.persistance.registry.jpa.utils;
+
+import org.apache.airavata.registry.cpi.ResultOrderType;
+
+import javax.persistence.EntityManager;
+import javax.persistence.Query;
+import java.util.HashMap;
+import java.util.Map;
+
+public class QueryGenerator {
+	private String tableName;
+	private Map<String,Object> matches=new HashMap<String, Object>();
+	private static final String SELECT_OBJ="p";
+	private static final String DELETE_OBJ="p";
+	private static final String TABLE_OBJ="p";
+//	
+//	public QueryGenerator(String tableName) {
+//		setTableName(tableName);
+//	}
+	
+	public QueryGenerator(String tableName, Object[]...params) {
+		setTableName(tableName);
+		for (Object[] param : params) {
+			addMatch(param[0].toString(), param[1]);
+		}
+	}
+	
+	public String getTableName() {
+		return tableName;
+	}
+	public void setTableName(String tableName) {
+		this.tableName = tableName;
+	}
+	public void addMatch(String colName, Object matchValue){
+		matches.put(colName, matchValue);
+	}
+	
+	public void setParameter(String colName, Object matchValue){
+		addMatch(colName, matchValue);
+	}
+
+    /**
+     * Select query
+     * @param entityManager
+     * @return
+     */
+	public Query selectQuery(EntityManager entityManager){
+        String queryString="SELECT "+ SELECT_OBJ + " FROM " +getTableName()+" "+TABLE_OBJ;
+        return generateQueryWithParameters(entityManager, queryString);
+    }
+
+    /**
+     * Select query with pagination
+     * @param entityManager
+     * @param orderByColumn
+     * @param resultOrderType
+     * @return
+     */
+    public Query selectQuery(EntityManager entityManager, String orderByColumn,
+                             ResultOrderType resultOrderType){
+        String order = (resultOrderType == ResultOrderType.ASC) ? "ASC" : "DESC";
+        String orderByClause = " ORDER BY " + SELECT_OBJ + "." + orderByColumn + " " + order;
+        String queryString="SELECT "+ SELECT_OBJ + " FROM " +getTableName()+" "+TABLE_OBJ;
+        return generateQueryWithParameters(entityManager, queryString, orderByClause);
+    }
+
+//    public Query countQuery(EntityManager entityManager){
+//        SELECT COUNT(p.host_descriptor_ID) FROM Host_Descriptor p WHERE p.gateway_name =:gate_ID and p.host_descriptor_ID =:host_desc_name")
+//        String queryString="SELECT COUNT("+ SELECT_OBJ + " FROM " +getTableName()+" "+TABLE_OBJ;
+//        return generateQueryWithParameters(entityManager, queryString);
+//    }
+	
+	public Query deleteQuery(EntityManager entityManager){
+		String queryString="Delete FROM "+getTableName()+" "+TABLE_OBJ;
+		return generateQueryWithParameters(entityManager, queryString);
+	}
+
+	private Query generateQueryWithParameters(EntityManager entityManager,
+			String queryString) {
+		return generateQueryWithParameters(entityManager, queryString, "");
+	}
+
+    private Query generateQueryWithParameters(EntityManager entityManager,
+                                              String queryString, String orderByClause) {
+        Map<String,Object> queryParameters=new HashMap<String, Object>();
+        if (matches.size()>0){
+            String matchString = "";
+            int paramCount=0;
+            for (String colName : matches.keySet()) {
+                String paramName="param"+paramCount;
+                queryParameters.put(paramName, matches.get(colName));
+                if (!matchString.equals("")){
+                    matchString+=" AND ";
+                }
+                matchString+=TABLE_OBJ+"."+colName+" =:"+paramName;
+                paramCount++;
+            }
+            queryString+=" WHERE "+matchString;
+        }
+        queryString += orderByClause;
+        Query query = entityManager.createQuery(queryString);
+        for (String paramName : queryParameters.keySet()) {
+            query.setParameter(paramName, queryParameters.get(paramName));
+        }
+        return query;
+    }
+}