org.apache.activemq.artemis.core.server.balancing.targets.TargetMonitor Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.activemq.artemis.core.server.balancing.targets;
import org.apache.activemq.artemis.core.server.ActiveMQScheduledComponent;
import org.jboss.logging.Logger;
import java.util.List;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class TargetMonitor extends ActiveMQScheduledComponent implements TargetListener {
private static final Logger logger = Logger.getLogger(TargetMonitor.class);
private final Target target;
private final List targetProbes;
private volatile boolean targetReady = false;
public Target getTarget() {
return target;
}
public boolean isTargetReady() {
return targetReady;
}
public TargetMonitor(ScheduledExecutorService scheduledExecutorService, int checkPeriod, Target target, List targetProbes) {
super(scheduledExecutorService, 0, checkPeriod, TimeUnit.MILLISECONDS, false);
this.target = target;
this.targetProbes = targetProbes;
}
@Override
public synchronized void start() {
target.setListener(this);
super.start();
}
@Override
public synchronized void stop() {
super.stop();
targetReady = false;
target.setListener(null);
try {
target.disconnect();
} catch (Exception e) {
logger.debug("Error on disconnecting target " + target, e);
}
}
@Override
public void run() {
try {
if (!target.isConnected()) {
if (logger.isDebugEnabled()) {
logger.debug("Connecting to " + target);
}
target.connect();
}
targetReady = target.checkReadiness() && checkTargetProbes();
if (logger.isDebugEnabled()) {
if (targetReady) {
logger.debug(target + " is ready");
} else {
logger.debug(target + " is not ready");
}
}
} catch (Exception e) {
logger.warn("Error monitoring " + target, e);
targetReady = false;
}
}
private boolean checkTargetProbes() {
for (TargetProbe targetProbe : targetProbes) {
if (!targetProbe.check(target)) {
logger.info(targetProbe.getName() + " has failed on " + target);
return false;
}
}
return true;
}
@Override
public void targetConnected() {
}
@Override
public void targetDisconnected() {
targetReady = false;
}
@Override
public String toString() {
return this.getClass().getSimpleName() + " [target=" + target + ", targetReady=" + targetReady + "]";
}
}