// 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.concurrent.Callable;

import org.apache.log4j.Logger;
import org.libvirt.Connect;

import com.cloud.utils.script.OutputInterpreter;
import com.cloud.utils.script.Script;

public class KVMHAChecker extends KVMHABase implements Callable<Boolean> {
	private static final Logger s_logger = Logger.getLogger(KVMHAChecker.class);
	private List<NfsStoragePool> _pools;
	private String _hostIP;
	private long _heartBeatCheckerTimeout = 360000; /* 6 minutes */

	public KVMHAChecker(List<NfsStoragePool> pools, String host) {
		this._pools = pools;
		this._hostIP = host;
	}

	/*
	 * True means heartbeaing is on going, or we can't get it's status. False
	 * means heartbeating is stopped definitely
	 */
	private Boolean checkingHB() {
		List<Boolean> results = new ArrayList<Boolean>();
		for (NfsStoragePool pool : _pools) {

			Script cmd = new Script(_heartBeatPath, _heartBeatCheckerTimeout,
					s_logger);
			cmd.add("-i", pool._poolIp);
			cmd.add("-p", pool._poolMountSourcePath);
			cmd.add("-m", pool._mountDestPath);
			cmd.add("-h", _hostIP);
			cmd.add("-r");
			cmd.add("-t",
					String.valueOf((_heartBeatUpdateFreq + _heartBeatUpdateTimeout) / 1000 * 2));
			OutputInterpreter.OneLineParser parser = new OutputInterpreter.OneLineParser();
			String result = cmd.execute(parser);
			s_logger.debug("pool: " + pool._poolIp);
			s_logger.debug("reture: " + result);
			s_logger.debug("parser: " + parser.getLine());
			if (result == null && parser.getLine().contains("> DEAD <")) {
				s_logger.debug("read heartbeat failed: " + result);
				results.add(false);
			} else {
				results.add(true);
			}
		}

		for (Boolean r : results) {
			if (r) {
				return true;
			}
		}

		return false;
	}

	@Override
	public Boolean call() throws Exception {
		// s_logger.addAppender(new org.apache.log4j.ConsoleAppender(new
		// org.apache.log4j.PatternLayout(), "System.out"));
		return checkingHB();
	}
}