KVMHAMonitor.java

// 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.agent.resource.computing;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.log4j.Logger;
import com.cloud.utils.script.Script;

public class KVMHAMonitor extends KVMHABase implements Runnable {
	private static final Logger s_logger = Logger.getLogger(KVMHAMonitor.class);
	private Map<String, NfsStoragePool> _storagePool = new ConcurrentHashMap<String, NfsStoragePool>();

	private String _hostIP; /* private ip address */

	public KVMHAMonitor(NfsStoragePool pool, String host, String scriptPath) {
		if (pool != null) {
			this._storagePool.put(pool._poolUUID, pool);
		}
		this._hostIP = host;
		this._heartBeatPath = scriptPath;
	}

	public void addStoragePool(NfsStoragePool pool) {
		synchronized (_storagePool) {
			this._storagePool.put(pool._poolUUID, pool);
		}
	}

	public void removeStoragePool(String uuid) {
		synchronized (_storagePool) {
			this._storagePool.remove(uuid);
		}
	}

	public List<NfsStoragePool> getStoragePools() {
		synchronized (_storagePool) {
			return new ArrayList<NfsStoragePool>(_storagePool.values());
		}
	}

	private class Monitor implements Runnable {

		@Override
		public void run() {
			synchronized (_storagePool) {
				for (NfsStoragePool primaryStoragePool : _storagePool.values()) {
					String result = null;
					for (int i = 0; i < 5; i++) {
						Script cmd = new Script(_heartBeatPath,
								_heartBeatUpdateTimeout, s_logger);
						cmd.add("-i", primaryStoragePool._poolIp);
						cmd.add("-p", primaryStoragePool._poolMountSourcePath);
						cmd.add("-m", primaryStoragePool._mountDestPath);
						cmd.add("-h", _hostIP);
						result = cmd.execute();
						if (result != null) {
							s_logger.warn("write heartbeat failed: " + result
									+ ", retry: " + i);
						} else {
							break;
						}
					}

					if (result != null) {
						s_logger.warn("write heartbeat failed: " + result
								+ "; reboot the host");
						Script cmd = new Script(_heartBeatPath,
								_heartBeatUpdateTimeout, s_logger);
						cmd.add("-i", primaryStoragePool._poolIp);
						cmd.add("-p", primaryStoragePool._poolMountSourcePath);
						cmd.add("-m", primaryStoragePool._mountDestPath);
						cmd.add("-c");
						result = cmd.execute();
					}
				}
			}

		}
	}

	@Override
	public void run() {
		// s_logger.addAppender(new org.apache.log4j.ConsoleAppender(new
		// org.apache.log4j.PatternLayout(), "System.out"));
		while (true) {
			Thread monitorThread = new Thread(new Monitor());
			monitorThread.start();
			try {
				monitorThread.join();
			} catch (InterruptedException e) {

			}

			try {
				Thread.sleep(_heartBeatUpdateFreq);
			} catch (InterruptedException e) {

			}
		}
	}

}