io.netty.util.internal.ThreadExecutorMap Maven / Gradle / Ivy
/*
* 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:
*
* 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 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, "command");
ObjectUtil.checkNotNull(eventExecutor, "eventExecutor");
return new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
return threadFactory.newThread(apply(r, eventExecutor));
}
};
}
}