[GitHub] rafaelweingartner commented on a change in pull request #2500: Restrict the number of managed clustered file systems per compute cluster

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rafaelweingartner commented on a change in pull request #2500: Restrict the number of managed clustered file systems per compute cluster
URL: https://github.com/apache/cloudstack/pull/2500#discussion_r178529766
 
 

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 File path: engine/components-api/src/main/java/com/cloud/storage/StorageUtil.java
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 @@ -0,0 +1,112 @@
+package com.cloud.storage;
+
+import com.cloud.dc.ClusterVO;
+import com.cloud.dc.dao.ClusterDao;
+import com.cloud.host.HostVO;
+import com.cloud.host.dao.HostDao;
+import com.cloud.hypervisor.Hypervisor;
+import com.cloud.storage.dao.VolumeDao;
+import com.cloud.vm.VMInstanceVO;
+import com.cloud.vm.dao.VMInstanceDao;
+
+import org.apache.cloudstack.storage.datastore.db.PrimaryDataStoreDao;
+import org.apache.cloudstack.storage.datastore.db.StoragePoolVO;
+
+import java.util.List;
+import javax.inject.Inject;
+
+public class StorageUtil {
+    @Inject private ClusterDao clusterDao;
+    @Inject private HostDao hostDao;
+    @Inject private PrimaryDataStoreDao storagePoolDao;
+    @Inject private VMInstanceDao vmInstanceDao;
+    @Inject private VolumeDao volumeDao;
+
+    private Long getClusterId(Long hostId) {
+        if (hostId == null) {
+            return null;
+        }
+
+        HostVO hostVO = hostDao.findById(hostId);
+
+        if (hostVO == null) {
+            return null;
+        }
+
+        return hostVO.getClusterId();
+    }
+
+    public boolean managedStoragePoolCanScale(StoragePool storagePool, Long clusterId, Long hostId) {
+        if (clusterId == null) {
+            clusterId = getClusterId(hostId);
+
+            if (clusterId == null) {
+                return true;
+            }
+        }
+
+        ClusterVO clusterVO = clusterDao.findById(clusterId);
+
+        if (clusterVO == null) {
+            return true;
+        }
+
+        Hypervisor.HypervisorType hypervisorType = clusterVO.getHypervisorType();
+
+        if (hypervisorType == null) {
+            return true;
+        }
+
+        if (Hypervisor.HypervisorType.XenServer.equals(hypervisorType) || Hypervisor.HypervisorType.VMware.equals(hypervisorType)) {
+            int maxValue = StorageManager.MaxNumberOfManagedClusteredFileSystems.valueIn(clusterId);
+
+            return getNumberOfManagedClusteredFileSystemsInComputeCluster(storagePool.getDataCenterId(), clusterId) < maxValue;
+        }
+
+        return true;
+    }
+
+    private int getNumberOfManagedClusteredFileSystemsInComputeCluster(long zoneId, long clusterId) {
+        int numberOfManagedClusteredFileSystemsInComputeCluster = 0;
+
+        List<VolumeVO> volumes = volumeDao.findByDc(zoneId);
+
+        if (volumes == null || volumes.size() == 0) {
 
 Review comment:
   You can use CollectionUtils.isEmpty here

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