org.apache.activemq.artemis.utils.critical.CriticalAnalyzerImpl Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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.utils.critical;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ConcurrentModificationException;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.activemq.artemis.core.server.ActiveMQScheduledComponent;
import org.apache.activemq.artemis.utils.ActiveMQThreadFactory;
import org.apache.activemq.artemis.utils.collections.ConcurrentHashSet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.invoke.MethodHandles;
public class CriticalAnalyzerImpl implements CriticalAnalyzer {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private volatile long timeoutNanoSeconds;
// one minute by default.. the server will change it for sure
private volatile long checkTimeNanoSeconds = TimeUnit.SECONDS.toNanos(60);
private final ActiveMQScheduledComponent scheduledComponent;
private final AtomicBoolean running = new AtomicBoolean(false);
public CriticalAnalyzerImpl() {
// this will make the scheduled component to start its own pool
/* Important: The scheduled component should have its own thread pool...
* otherwise in case of a deadlock, or a starvation of the server the analyzer won't pick up any
* issues and won't be able to shutdown the server or halt the VM
*/
this.scheduledComponent = new ActiveMQScheduledComponent(null, null, checkTimeNanoSeconds, TimeUnit.NANOSECONDS, false) {
@Override
public void run() {
logger.trace("Checking critical analyzer");
check();
}
@Override
protected ActiveMQThreadFactory getThreadFactory() {
return new ActiveMQThreadFactory("CriticalAnalyzer", "Critical-Analyzer-", true, getThisClassLoader());
}
private ClassLoader getThisClassLoader() {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
return CriticalAnalyzerImpl.this.getClass().getClassLoader();
}
});
}
};
}
@Override
public void clear() {
actions.clear();
components.clear();
}
private CopyOnWriteArrayList actions = new CopyOnWriteArrayList<>();
private final ConcurrentHashSet components = new ConcurrentHashSet<>();
@Override
public int getNumberOfComponents() {
return components.size();
}
@Override
public boolean isMeasuring() {
return true;
}
@Override
public void add(CriticalComponent component) {
components.add(component);
}
@Override
public void remove(CriticalComponent component) {
components.remove(component);
}
@Override
public CriticalAnalyzer setCheckTime(long timeout, TimeUnit unit) {
this.checkTimeNanoSeconds = unit.toNanos(timeout);
this.scheduledComponent.setPeriod(timeout, unit);
return this;
}
@Override
public long getCheckTimeNanoSeconds() {
if (checkTimeNanoSeconds == 0) {
checkTimeNanoSeconds = getTimeout(TimeUnit.NANOSECONDS) / 2;
}
return checkTimeNanoSeconds;
}
@Override
public CriticalAnalyzer setTimeout(long timeout, TimeUnit unit) {
if (checkTimeNanoSeconds <= 0) {
this.setCheckTime(timeout / 2, unit);
}
this.timeoutNanoSeconds = unit.toNanos(timeout);
return this;
}
@Override
public long getTimeout(TimeUnit unit) {
if (timeoutNanoSeconds == 0) {
timeoutNanoSeconds = TimeUnit.MINUTES.toNanos(2);
}
return unit.convert(timeoutNanoSeconds, TimeUnit.NANOSECONDS);
}
@Override
public long getTimeoutNanoSeconds() {
return timeoutNanoSeconds;
}
@Override
public CriticalAnalyzer addAction(CriticalAction action) {
this.actions.add(action);
return this;
}
@Override
public void check() {
boolean retry = true;
while (retry) {
try {
for (CriticalComponent component : components) {
if (component.checkExpiration(timeoutNanoSeconds, true)) {
fireActions(component);
// no need to keep running if there's already a component failed
return;
}
}
retry = false; // got to the end of the list, no need to retry
} catch (ConcurrentModificationException dontCare) {
// lets retry on the loop
}
}
}
protected void fireActions(CriticalComponent component) {
for (CriticalAction action : actions) {
try {
action.run(component);
} catch (Throwable e) {
logger.warn(e.getMessage(), e);
}
}
}
@Override
public void start() {
scheduledComponent.start();
}
@Override
public void stop() {
scheduledComponent.stop();
}
@Override
public boolean isStarted() {
return scheduledComponent.isStarted();
}
}