/*
* Copyright 2003-2016 JetBrains s.r.o.
*
* 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 jetbrains.mps.classloading;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
/**
* @author apyshkin
* @since 31/12/16
*/
final class DeadlockDetector {
private static final Logger LOG = LogManager.getLogger(DeadlockDetector.class);
private final ScheduledExecutorService myDeadlockDetector;
private volatile boolean myDeadlockDetected;
public DeadlockDetector(long delayMS) {
myDeadlockDetector = Executors.newSingleThreadScheduledExecutor();
myDeadlockDetector.scheduleAtFixedRate(this::detectDeadLock, delayMS, delayMS, TimeUnit.MILLISECONDS);
}
public void stop() {
myDeadlockDetector.shutdownNow();
}
private void detectDeadLock() {
if (!myDeadlockDetected) {
long[] deadlockedThreads = ManagementFactory.getThreadMXBean().findDeadlockedThreads();
if (deadlockedThreads != null) {
LOG.error("Deadlock is detected:");
for (long deadlockThreadId : deadlockedThreads) {
ThreadInfo threadInfo = ManagementFactory.getThreadMXBean().getThreadInfo(deadlockThreadId);
Thread.getAllStackTraces().keySet().stream()
.filter(thread -> thread.getId() == threadInfo.getThreadId())
.forEach(thread -> {
System.err.println(threadInfo.toString().trim());
for (StackTraceElement ste : thread.getStackTrace()) {
System.err.println("\t" + ste.toString().trim());
}
});
}
myDeadlockDetected = true;
}
}
}
public boolean isDeadlockDetected() {
return myDeadlockDetected;
}
}