ChannelGroup.java — netty Source File

Source Code

/*
 * 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.channel.group;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufHolder;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelId;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.EventLoop;
import io.netty.channel.ServerChannel;
import io.netty.util.CharsetUtil;
import io.netty.util.concurrent.GlobalEventExecutor;

import java.util.Set;

/**
 * A thread-safe {@link Set} that contains open {@link Channel}s and provides
 * various bulk operations on them.  Using {@link ChannelGroup}, you can
 * categorize {@link Channel}s into a meaningful group (e.g. on a per-service
 * or per-state basis.)  A closed {@link Channel} is automatically removed from
 * the collection, so that you don't need to worry about the life cycle of the
 * added {@link Channel}.  A {@link Channel} can belong to more than one
 * {@link ChannelGroup}.
 *
 * <h3>Broadcast a message to multiple {@link Channel}s</h3>
 * <p>
 * If you need to broadcast a message to more than one {@link Channel}, you can
 * add the {@link Channel}s associated with the recipients and call {@link ChannelGroup#write(Object)}:
 * <pre>
 * <strong>{@link ChannelGroup} recipients =
 *         new {@link DefaultChannelGroup}({@link GlobalEventExecutor}.INSTANCE);</strong>
 * recipients.add(channelA);
 * recipients.add(channelB);
 * ..
 * <strong>recipients.write({@link Unpooled}.copiedBuffer(
 *         "Service will shut down for maintenance in 5 minutes.",
 *         {@link CharsetUtil}.UTF_8));</strong>
 * </pre>
 *
 * <h3>Simplify shutdown process with {@link ChannelGroup}</h3>
 * <p>
 * If both {@link ServerChannel}s and non-{@link ServerChannel}s exist in the
 * same {@link ChannelGroup}, any requested I/O operations on the group are
// ... (219 more lines)