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/*
* Copyright 2013 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.concurrent;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.util.ArrayDeque;
import java.util.Queue;
import java.util.concurrent.TimeUnit;
/**
* Executes {@link Runnable} objects in the caller's thread. If the {@link #execute(Runnable)} is reentrant it will be
* queued until the original {@link Runnable} finishes execution.
*
* All {@link Throwable} objects thrown from {@link #execute(Runnable)} will be swallowed and logged. This is to ensure
* that all queued {@link Runnable} objects have the chance to be run.
*/
public final class ImmediateEventExecutor extends AbstractEventExecutor {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(ImmediateEventExecutor.class);
public static final ImmediateEventExecutor INSTANCE = new ImmediateEventExecutor();
/**
* A Runnable will be queued if we are executing a Runnable. This is to prevent a {@link StackOverflowError}.
*/
private static final FastThreadLocal> DELAYED_RUNNABLES = new FastThreadLocal>() {
@Override
protected Queue initialValue() throws Exception {
return new ArrayDeque();
}
};
/**
* Set to {@code true} if we are executing a runnable.
*/
private static final FastThreadLocal RUNNING = new FastThreadLocal() {
@Override
protected Boolean initialValue() throws Exception {
return false;
}
};
private final Future> terminationFuture = new FailedFuture