/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.heartbeat;
import alluxio.security.LoginUser;
import alluxio.security.authentication.AuthenticatedClientUser;
import alluxio.util.CommonUtils;
import alluxio.util.SecurityUtils;
import com.google.common.base.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import javax.annotation.concurrent.NotThreadSafe;
/**
* Thread class to execute a heartbeat periodically. This thread is daemonic, so it will not prevent
* the JVM from exiting.
*/
@NotThreadSafe
public final class HeartbeatThread implements Runnable {
private static final Logger LOG = LoggerFactory.getLogger(HeartbeatThread.class);
private final String mThreadName;
private final HeartbeatExecutor mExecutor;
private HeartbeatTimer mTimer;
/**
* Creates a {@link Runnable} to execute heartbeats for the given {@link HeartbeatExecutor}.
*
* This class is responsible for closing the given {@link HeartbeatExecutor} when it finishes.
*
* @param threadName identifies the heartbeat thread name
* @param executor identifies the heartbeat thread executor; an instance of a class that
* implements the HeartbeatExecutor interface
* @param intervalMs Sleep time between different heartbeat
*/
public HeartbeatThread(String threadName, HeartbeatExecutor executor, long intervalMs) {
mThreadName = threadName;
mExecutor = Preconditions.checkNotNull(executor, "executor");
Class<? extends HeartbeatTimer> timerClass = HeartbeatContext.getTimerClass(threadName);
try {
mTimer =
CommonUtils.createNewClassInstance(timerClass, new Class[] {String.class, long.class},
new Object[] {threadName, intervalMs});
} catch (Exception e) {
String msg = "timer class could not be instantiated";
LOG.error("{} : {} , {}", msg, threadName, e);
mTimer = new SleepingTimer(threadName, intervalMs);
}
}
@Override
public void run() {
try {
if (SecurityUtils.isSecurityEnabled() && AuthenticatedClientUser.get() == null) {
AuthenticatedClientUser.set(LoginUser.get().getName());
}
} catch (IOException e) {
LOG.error("Failed to set AuthenticatedClientUser in HeartbeatThread.");
}
// set the thread name
Thread.currentThread().setName(mThreadName);
try {
// Thread.interrupted() clears the interrupt status. Do not call interrupt again to clear it.
while (!Thread.interrupted()) {
// TODO(peis): Fix this. The current implementation consumes one thread even when ticking.
mTimer.tick();
mExecutor.heartbeat();
}
} catch (InterruptedException e) {
LOG.info("Hearbeat is interrupted.");
} catch (Exception e) {
LOG.error("Uncaught exception in heartbeat executor, Heartbeat Thread shutting down", e);
} finally {
mExecutor.close();
}
}
}