// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License.  Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
// 
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.storage.listener;

import java.util.List;

import org.apache.log4j.Logger;

import com.cloud.agent.Listener;
import com.cloud.agent.api.AgentControlAnswer;
import com.cloud.agent.api.AgentControlCommand;
import com.cloud.agent.api.Answer;
import com.cloud.agent.api.Command;
import com.cloud.agent.api.StartupCommand;
import com.cloud.agent.api.StartupRoutingCommand;
import com.cloud.exception.ConnectionException;
import com.cloud.host.HostVO;
import com.cloud.host.Status;
import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.server.ManagementService;
import com.cloud.storage.OCFS2Manager;
import com.cloud.storage.StorageManagerImpl;
import com.cloud.storage.StoragePoolVO;
import com.cloud.storage.Storage.StoragePoolType;
import com.cloud.storage.dao.StoragePoolDao;
import com.cloud.utils.component.ComponentLocator;
import com.cloud.utils.component.Inject;

public class StoragePoolMonitor implements Listener {
    private static final Logger s_logger = Logger.getLogger(StoragePoolMonitor.class);
	private final StorageManagerImpl _storageManager;
	private final StoragePoolDao _poolDao;
	OCFS2Manager _ocfs2Mgr;
	
    public StoragePoolMonitor(StorageManagerImpl mgr, StoragePoolDao poolDao) {
    	this._storageManager = mgr;
    	this._poolDao = poolDao;
    	
    	ComponentLocator locator = ComponentLocator.getLocator(ManagementService.Name);
    	this._ocfs2Mgr = locator.getManager(OCFS2Manager.class);
    }
    
    
    @Override
    public boolean isRecurring() {
        return false;
    }
    
    @Override
    public synchronized boolean processAnswers(long agentId, long seq, Answer[] resp) {
        return true;
    }
    
    @Override
    public synchronized boolean processDisconnect(long agentId, Status state) {
        return true;
    }
    
    @Override
    public void processConnect(HostVO host, StartupCommand cmd, boolean forRebalance) throws ConnectionException {
    	if (cmd instanceof StartupRoutingCommand) {
    		StartupRoutingCommand scCmd = (StartupRoutingCommand)cmd;
    		if (scCmd.getHypervisorType() == HypervisorType.XenServer || scCmd.getHypervisorType() ==  HypervisorType.KVM ||
				scCmd.getHypervisorType() == HypervisorType.VMware || scCmd.getHypervisorType() ==  HypervisorType.Simulator || scCmd.getHypervisorType() == HypervisorType.Ovm) {
    			List<StoragePoolVO> pools = _poolDao.listBy(host.getDataCenterId(), host.getPodId(), host.getClusterId());
    			for (StoragePoolVO pool : pools) {
    			    if (!pool.getPoolType().isShared()) {
    			        continue;
    			    }
    			    
    			    if (pool.getPoolType() == StoragePoolType.OCFS2 && !_ocfs2Mgr.prepareNodes(pool.getClusterId())) {
    			        throw new ConnectionException(true, "Unable to prepare OCFS2 nodes for pool " + pool.getId());
    			    }
    			    
    				Long hostId = host.getId();
    				s_logger.debug("Host " + hostId + " connected, sending down storage pool information ...");
    				try {
    				    _storageManager.connectHostToSharedPool(hostId, pool);
    					_storageManager.createCapacityEntry(pool);
    				} catch (Exception e) {
    				    throw new ConnectionException(true, "Unable to connect to pool " + pool, e);
    				}
    			}
    		}
    	}
    }
    

    @Override
    public boolean processCommands(long agentId, long seq, Command[] req) {
        return false;
    }
   
    @Override
    public AgentControlAnswer processControlCommand(long agentId, AgentControlCommand cmd) {
    	return null;
    }
    
    @Override
    public boolean processTimeout(long agentId, long seq) {
    	return true;
    }
    
    @Override
    public int getTimeout() {
    	return -1;
    }
    
}