/**
* Copyright 2004-2006 jManage.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with 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.
*/
package org.jmanage.monitoring.downtime;
import java.io.IOException;
import java.util.logging.Logger;
import org.jmanage.core.config.ApplicationConfig;
import org.jmanage.core.config.event.ApplicationEvent;
import org.jmanage.core.management.ServerConnection;
import org.jmanage.core.management.ServerConnector;
import org.jmanage.core.util.Loggers;
import org.jmanage.event.EventSystem;
import org.jmanage.monitoring.downtime.event.ApplicationDownEvent;
import org.jmanage.monitoring.downtime.event.ApplicationUpEvent;
/**
* ApplicationHeartBeatThread tracks downtime of a single application.
* This information is captured as a list of ApplicationDowntime objects.
*
* @author Rakesh Kalra
*/
public class ApplicationHeartBeatThread extends Thread {
private static final Logger logger = Loggers
.getLogger(ApplicationHeartBeatThread.class);
private final ApplicationConfig appConfig;
private boolean end = false;
private boolean wasOpen = true;
protected ApplicationHeartBeatThread(ApplicationConfig appConfig) {
super("ApplicationHeartBeatThread:" + appConfig.getName());
this.appConfig = appConfig;
}
protected ApplicationHeartBeatThread(ApplicationEvent appEvent) {
this(appEvent.getApplicationConfig());
/* check if the application is up */
wasOpen = isOpen();
if(!wasOpen){
EventSystem.getInstance().fireEvent(
new ApplicationDownEvent(appConfig, appEvent.getTime()));
}
}
@Override
public void run() {
logger.info("Thread started: " + this.getName());
while (!end) {
checkApplicationStatus();
try {
sleep(10000);
} catch (InterruptedException e) {
logger.warning("InterruptedException: " + e.getMessage());
}
}
logger.info("Thread finished: " + this.getName());
}
protected void end() {
end = true;
}
private void checkApplicationStatus() {
final boolean isOpen = isOpen();
if(wasOpen && !isOpen){
// application went down
wasOpen = false;
EventSystem.getInstance().fireEvent(
new ApplicationDownEvent(appConfig));
}else if(!wasOpen && isOpen){
// application came pack up
wasOpen = true;
EventSystem.getInstance().fireEvent(
new ApplicationUpEvent(appConfig));
}
}
private boolean isOpen(){
ServerConnection connection = null;
try {
connection = ServerConnector.getServerConnection(appConfig);
return connection.isOpen();
}catch(Exception e){
logger.info("Application is down: " + appConfig.getName());
return false;
} finally {
try {
if (connection != null)
connection.close();
} catch (IOException e) {
logger.warning(e.getMessage());
}
}
}
public ApplicationConfig getApplicationConfig() {
return appConfig;
}
}