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InfiniteLoopExecutor.java
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InfiniteLoopExecutor.java
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/*
* 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.cassandra.concurrent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.TimeUnit;
import com.google.common.annotations.VisibleForTesting;
public class InfiniteLoopExecutor
{
private static final Logger logger = LoggerFactory.getLogger(InfiniteLoopExecutor.class);
public interface InterruptibleRunnable
{
void run() throws InterruptedException;
}
private final Thread thread;
private final InterruptibleRunnable runnable;
private volatile boolean isShutdown = false;
public InfiniteLoopExecutor(String name, InterruptibleRunnable runnable)
{
this.runnable = runnable;
this.thread = new Thread(this::loop, name);
this.thread.setDaemon(true);
}
private void loop()
{
while (!isShutdown)
{
try
{
runnable.run();
}
catch (InterruptedException ie)
{
if (isShutdown)
return;
logger.error("Interrupted while executing {}, but not shutdown; continuing with loop", runnable, ie);
}
catch (Throwable t)
{
logger.error("Exception thrown by runnable, continuing with loop", t);
}
}
}
public InfiniteLoopExecutor start()
{
thread.start();
return this;
}
public void shutdownNow()
{
isShutdown = true;
thread.interrupt();
}
public boolean awaitTermination(long time, TimeUnit unit) throws InterruptedException
{
thread.join(unit.toMillis(time));
return !thread.isAlive();
}
@VisibleForTesting
public boolean isAlive()
{
return this.thread.isAlive();
}
}