com.hazelcast.internal.networking.nio.iobalancer.IOBalancerThread Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.internal.networking.nio.iobalancer;
import com.hazelcast.logging.ILogger;
import java.util.concurrent.BlockingQueue;
import static com.hazelcast.internal.util.EmptyStatement.ignore;
import static com.hazelcast.internal.util.ThreadUtil.createThreadName;
import static java.lang.System.currentTimeMillis;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
class IOBalancerThread extends Thread {
private static final String THREAD_NAME_PREFIX = "IO.BalancerThread";
private final IOBalancer ioBalancer;
private final ILogger log;
private final long balancerIntervalMs;
private final BlockingQueue workQueue;
private volatile boolean shutdown;
IOBalancerThread(IOBalancer ioBalancer,
int balancerIntervalSeconds,
String hzName,
ILogger log,
BlockingQueue workQueue) {
super(createThreadName(hzName, THREAD_NAME_PREFIX));
this.ioBalancer = ioBalancer;
this.log = log;
this.balancerIntervalMs = SECONDS.toMillis(balancerIntervalSeconds);
this.workQueue = workQueue;
}
void shutdown() {
shutdown = true;
interrupt();
}
// squid:S2142 is suppressed since Sonar analysis gives false positive for an already handled or known case.
@SuppressWarnings("squid:S2142")
@Override
public void run() {
try {
log.finest("Starting IOBalancer thread");
long nextRebalanceMs = currentTimeMillis() + balancerIntervalMs;
while (!shutdown) {
for (; ; ) {
long maxPollDurationMs = nextRebalanceMs - currentTimeMillis();
Runnable task = maxPollDurationMs <= 0 ? workQueue.poll() : workQueue.poll(maxPollDurationMs, MILLISECONDS);
if (task == null) {
// we are finished with taking task from the queue, lets
// do a bit of rebalancing.
break;
}
task.run();
}
ioBalancer.rebalance();
nextRebalanceMs = currentTimeMillis() + balancerIntervalMs;
}
} catch (InterruptedException e) {
log.finest("IOBalancer thread stopped");
//this thread is about to exit, no reason restoring the interrupt flag
ignore(e);
} catch (Throwable e) {
log.severe("IOBalancer failed", e);
}
}
}