add basic storage migration support

api/src/com/cloud/api/commands/MigrateVolumeCmd.java

@@ -0,0 +1,89 @@
+package com.cloud.api.commands;
+
+import com.cloud.api.ApiConstants;
+import com.cloud.api.BaseAsyncCmd;
+import com.cloud.api.BaseCmd;
+import com.cloud.api.Parameter;
+import com.cloud.api.ServerApiException;
+import com.cloud.api.BaseCmd.CommandType;
+import com.cloud.api.response.VolumeResponse;
+import com.cloud.event.EventTypes;
+import com.cloud.exception.ConcurrentOperationException;
+import com.cloud.exception.InsufficientCapacityException;
+import com.cloud.exception.ResourceAllocationException;
+import com.cloud.exception.ResourceUnavailableException;
+import com.cloud.storage.Volume;
+import com.cloud.user.Account;
+import com.cloud.uservm.UserVm;
+
+public class MigrateVolumeCmd extends BaseAsyncCmd {
+	private static final String s_name = "migratevolumeresponse";
+	
+	 /////////////////////////////////////////////////////
+    //////////////// API parameters /////////////////////
+    /////////////////////////////////////////////////////
+
+    @Parameter(name=ApiConstants.VOLUME_ID, type=CommandType.LONG, required=true, description="the ID of the volume")
+    private Long volumeId;
+
+    @Parameter(name=ApiConstants.STORAGE_ID, type=CommandType.LONG, required=false, description="destination storage pool ID to migrate the volume to")
+    private Long storageId;
+    
+    /////////////////////////////////////////////////////
+    /////////////////// Accessors ///////////////////////
+    /////////////////////////////////////////////////////
+
+    public Long getVolumeId() {
+        return volumeId;
+    }
+
+    public Long getStoragePoolId() {
+    	return storageId;
+    }
+    /////////////////////////////////////////////////////
+    /////////////// API Implementation///////////////////
+    /////////////////////////////////////////////////////
+
+    @Override
+    public String getCommandName() {
+        return s_name;
+    }
+    
+    @Override
+    public long getEntityOwnerId() {
+    	  Volume volume = _entityMgr.findById(Volume.class, getVolumeId());
+          if (volume != null) {
+              return volume.getAccountId();
+          }
+
+          return Account.ACCOUNT_ID_SYSTEM; // no account info given, parent this command to SYSTEM so ERROR events are tracked
+    }
+
+    @Override
+    public String getEventType() {
+        return EventTypes.EVENT_VOLUME_MIGRATE;
+    }
+
+    @Override
+    public String getEventDescription() {
+        return  "Attempting to migrate volume Id: " + getVolumeId() + " to storage pool Id: "+ getStoragePoolId();
+    }
+    
+    
+    @Override
+    public void execute(){
+    	Volume result;
+		try {
+			result = _storageService.migrateVolume(getVolumeId(), getStoragePoolId());
+			 if (result != null) {
+	             VolumeResponse response = _responseGenerator.createVolumeResponse(result);
+	             response.setResponseName(getCommandName());
+	             this.setResponseObject(response);
+			 }
+		} catch (ConcurrentOperationException e) {
+			throw new ServerApiException(BaseCmd.INTERNAL_ERROR, "Failed to migrate volume: ");
+		}
+    	
+    }
+
+}