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RATIS-1893. In SegmentedRaftLogCache, start a daemon thread to checkA…
…ndEvictCache. (apache#924)
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ratis-common/src/main/java/org/apache/ratis/util/AwaitToRun.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.ratis.util; | ||
|
|
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.util.concurrent.atomic.AtomicReference; | ||
|
|
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| /** | ||
| * Use a {@link Daemon}, | ||
| * which repeatedly waits for a signal to run a method. | ||
| * <p> | ||
| * This class is threadsafe. | ||
| * | ||
| * @see AwaitForSignal | ||
| */ | ||
| public class AwaitToRun implements AutoCloseable { | ||
| public static final Logger LOG = LoggerFactory.getLogger(AwaitToRun.class); | ||
|
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| private final class RunnableImpl implements Runnable { | ||
| private final Runnable runMethod; | ||
|
|
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| private RunnableImpl(Runnable runMethod) { | ||
| this.runMethod = runMethod; | ||
| } | ||
|
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| @Override | ||
| public void run() { | ||
| for (; ; ) { | ||
| try { | ||
| awaitForSignal.await(); | ||
| } catch (InterruptedException e) { | ||
| LOG.info("{} is interrupted", awaitForSignal); | ||
| Thread.currentThread().interrupt(); | ||
| return; | ||
| } | ||
|
|
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| try { | ||
| runMethod.run(); | ||
| } catch (Throwable t) { | ||
| LOG.error(name + ": runMethod failed", t); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| private final String name; | ||
| private final AwaitForSignal awaitForSignal; | ||
| private final AtomicReference<Daemon> daemon; | ||
|
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| public AwaitToRun(Object namePrefix, Runnable runMethod) { | ||
| this.name = namePrefix + "-" + JavaUtils.getClassSimpleName(getClass()); | ||
| this.awaitForSignal = new AwaitForSignal(name); | ||
| this.daemon = new AtomicReference<>(Daemon.newBuilder() | ||
| .setName(name) | ||
| .setRunnable(new RunnableImpl(runMethod)) | ||
| .build()); | ||
| } | ||
|
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| /** Similar to {@link Thread#start()}. */ | ||
| public AwaitToRun start() { | ||
| final Daemon d = daemon.get(); | ||
| if (d != null) { | ||
| d.start(); | ||
| LOG.info("{} started", d); | ||
| } else { | ||
| LOG.warn("{} is already closed", name); | ||
| } | ||
| return this; | ||
| } | ||
|
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| /** Signal to run. */ | ||
| public void signal() { | ||
| awaitForSignal.signal(); | ||
| } | ||
|
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| @Override | ||
| public void close() { | ||
| final Daemon d = daemon.getAndSet(null); | ||
| if (d == null) { | ||
| return; | ||
| } | ||
|
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| d.interrupt(); | ||
| try { | ||
| d.join(); | ||
| } catch (InterruptedException e) { | ||
| LOG.warn(d + ": join is interrupted", e); | ||
| Thread.currentThread().interrupt(); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public String toString() { | ||
| return name; | ||
| } | ||
| } |
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