io.netty.util.internal.ThreadExecutorMap Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright 2019 The Netty Project
*
* The Netty Project 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:
*
* https://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 io.netty.util.internal;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.FastThreadLocal;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadFactory;
/**
* Allow to retrieve the {@link EventExecutor} for the calling {@link Thread}.
*/
public final class ThreadExecutorMap {
private static final FastThreadLocal mappings = new FastThreadLocal();
private ThreadExecutorMap() { }
/**
* Returns the current {@link EventExecutor} that uses the {@link Thread}, or {@code null} if none / unknown.
*/
public static EventExecutor currentExecutor() {
return mappings.get();
}
/**
* Set the current {@link EventExecutor} that is used by the {@link Thread}.
*/
private static void setCurrentEventExecutor(EventExecutor executor) {
mappings.set(executor);
}
/**
* Decorate the given {@link Executor} and ensure {@link #currentExecutor()} will return {@code eventExecutor}
* when called from within the {@link Runnable} during execution.
*/
public static Executor apply(final Executor executor, final EventExecutor eventExecutor) {
ObjectUtil.checkNotNull(executor, "executor");
ObjectUtil.checkNotNull(eventExecutor, "eventExecutor");
return new Executor() {
@Override
public void execute(final Runnable command) {
executor.execute(apply(command, eventExecutor));
}
};
}
/**
* Decorate the given {@link Runnable} and ensure {@link #currentExecutor()} will return {@code eventExecutor}
* when called from within the {@link Runnable} during execution.
*/
public static Runnable apply(final Runnable command, final EventExecutor eventExecutor) {
ObjectUtil.checkNotNull(command, "command");
ObjectUtil.checkNotNull(eventExecutor, "eventExecutor");
return new Runnable() {
@Override
public void run() {
setCurrentEventExecutor(eventExecutor);
try {
command.run();
} finally {
setCurrentEventExecutor(null);
}
}
};
}
/**
* Decorate the given {@link ThreadFactory} and ensure {@link #currentExecutor()} will return {@code eventExecutor}
* when called from within the {@link Runnable} during execution.
*/
public static ThreadFactory apply(final ThreadFactory threadFactory, final EventExecutor eventExecutor) {
ObjectUtil.checkNotNull(threadFactory, "threadFactory");
ObjectUtil.checkNotNull(eventExecutor, "eventExecutor");
return new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
return threadFactory.newThread(apply(r, eventExecutor));
}
};
}
}