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/*
* Copyright 2012 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.channel;
import io.netty.util.concurrent.RejectedExecutionHandler;
import io.netty.util.concurrent.RejectedExecutionHandlers;
import io.netty.util.concurrent.SingleThreadEventExecutor;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.UnstableApi;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadFactory;
/**
* Abstract base class for {@link EventLoop}s that execute all its submitted tasks in a single thread.
*
*/
public abstract class SingleThreadEventLoop extends SingleThreadEventExecutor implements EventLoop {
protected static final int DEFAULT_MAX_PENDING_TASKS = Math.max(16,
SystemPropertyUtil.getInt("io.netty.eventLoop.maxPendingTasks", Integer.MAX_VALUE));
private final Queue tailTasks;
protected SingleThreadEventLoop(EventLoopGroup parent, ThreadFactory threadFactory, boolean addTaskWakesUp) {
this(parent, threadFactory, addTaskWakesUp, DEFAULT_MAX_PENDING_TASKS, RejectedExecutionHandlers.reject());
}
protected SingleThreadEventLoop(EventLoopGroup parent, Executor executor, boolean addTaskWakesUp) {
this(parent, executor, addTaskWakesUp, DEFAULT_MAX_PENDING_TASKS, RejectedExecutionHandlers.reject());
}
protected SingleThreadEventLoop(EventLoopGroup parent, ThreadFactory threadFactory,
boolean addTaskWakesUp, int maxPendingTasks,
RejectedExecutionHandler rejectedExecutionHandler) {
super(parent, threadFactory, addTaskWakesUp, maxPendingTasks, rejectedExecutionHandler);
tailTasks = newTaskQueue(maxPendingTasks);
}
protected SingleThreadEventLoop(EventLoopGroup parent, Executor executor,
boolean addTaskWakesUp, int maxPendingTasks,
RejectedExecutionHandler rejectedExecutionHandler) {
super(parent, executor, addTaskWakesUp, maxPendingTasks, rejectedExecutionHandler);
tailTasks = newTaskQueue(maxPendingTasks);
}
protected SingleThreadEventLoop(EventLoopGroup parent, Executor executor,
boolean addTaskWakesUp, Queue taskQueue, Queue tailTaskQueue,
RejectedExecutionHandler rejectedExecutionHandler) {
super(parent, executor, addTaskWakesUp, taskQueue, rejectedExecutionHandler);
tailTasks = ObjectUtil.checkNotNull(tailTaskQueue, "tailTaskQueue");
}
@Override
public EventLoopGroup parent() {
return (EventLoopGroup) super.parent();
}
@Override
public EventLoop next() {
return (EventLoop) super.next();
}
@Override
public ChannelFuture register(Channel channel) {
return register(new DefaultChannelPromise(channel, this));
}
@Override
public ChannelFuture register(final ChannelPromise promise) {
ObjectUtil.checkNotNull(promise, "promise");
promise.channel().unsafe().register(this, promise);
return promise;
}
@Deprecated
@Override
public ChannelFuture register(final Channel channel, final ChannelPromise promise) {
ObjectUtil.checkNotNull(promise, "promise");
ObjectUtil.checkNotNull(channel, "channel");
channel.unsafe().register(this, promise);
return promise;
}
/**
* Adds a task to be run once at the end of next (or current) {@code eventloop} iteration.
*
* @param task to be added.
*/
@UnstableApi
public final void executeAfterEventLoopIteration(Runnable task) {
ObjectUtil.checkNotNull(task, "task");
if (isShutdown()) {
reject();
}
if (!tailTasks.offer(task)) {
reject(task);
}
if (wakesUpForTask(task)) {
wakeup(inEventLoop());
}
}
/**
* Removes a task that was added previously via {@link #executeAfterEventLoopIteration(Runnable)}.
*
* @param task to be removed.
*
* @return {@code true} if the task was removed as a result of this call.
*/
@UnstableApi
final boolean removeAfterEventLoopIterationTask(Runnable task) {
return tailTasks.remove(ObjectUtil.checkNotNull(task, "task"));
}
@Override
protected void afterRunningAllTasks() {
runAllTasksFrom(tailTasks);
}
@Override
protected boolean hasTasks() {
return super.hasTasks() || !tailTasks.isEmpty();
}
@Override
public int pendingTasks() {
return super.pendingTasks() + tailTasks.size();
}
/**
* Returns the number of {@link Channel}s registered with this {@link EventLoop} or {@code -1}
* if operation is not supported. The returned value is not guaranteed to be exact accurate and
* should be viewed as a best effort.
*/
@UnstableApi
public int registeredChannels() {
return -1;
}
/**
* @return read-only iterator of active {@link Channel}s registered with this {@link EventLoop}.
* The returned value is not guaranteed to be exact accurate and
* should be viewed as a best effort. This method is expected to be called from within
* event loop.
* @throws UnsupportedOperationException if operation is not supported by implementation.
*/
@UnstableApi
public Iterator registeredChannelsIterator() {
throw new UnsupportedOperationException("registeredChannelsIterator");
}
protected static final class ChannelsReadOnlyIterator implements Iterator {
private final Iterator channelIterator;
public ChannelsReadOnlyIterator(Iterable channelIterable) {
this.channelIterator =
ObjectUtil.checkNotNull(channelIterable, "channelIterable").iterator();
}
@Override
public boolean hasNext() {
return channelIterator.hasNext();
}
@Override
public Channel next() {
return channelIterator.next();
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove");
}
@SuppressWarnings("unchecked")
public static Iterator empty() {
return (Iterator) EMPTY;
}
private static final Iterator
