/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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 org.apache.flink.runtime.io.network.netty;
import io.netty.channel.ChannelHandler;
import org.apache.flink.runtime.io.network.TaskEventDispatcher;
import org.apache.flink.runtime.io.network.partition.ResultPartitionProvider;
import static org.apache.flink.runtime.io.network.netty.NettyMessage.NettyMessageEncoder;
import static org.apache.flink.runtime.io.network.netty.NettyMessage.NettyMessageEncoder.createFrameLengthDecoder;
class PartitionRequestProtocol implements NettyProtocol {
private final NettyMessageEncoder messageEncoder = new NettyMessageEncoder();
private final NettyMessage.NettyMessageDecoder messageDecoder = new NettyMessage.NettyMessageDecoder();
private final ResultPartitionProvider partitionProvider;
private final TaskEventDispatcher taskEventDispatcher;
PartitionRequestProtocol(ResultPartitionProvider partitionProvider, TaskEventDispatcher taskEventDispatcher) {
this.partitionProvider = partitionProvider;
this.taskEventDispatcher = taskEventDispatcher;
}
// +-------------------------------------------------------------------+
// | SERVER CHANNEL PIPELINE |
// | |
// | +----------+----------+ (3) write +----------------------+ |
// | | Queue of queues +----------->| Message encoder | |
// | +----------+----------+ +-----------+----------+ |
// | /|\ \|/ |
// | | (2) enqueue | |
// | +----------+----------+ | |
// | | Request handler | | |
// | +----------+----------+ | |
// | /|\ | |
// | | | |
// | +----------+----------+ | |
// | | Message decoder | | |
// | +----------+----------+ | |
// | /|\ | |
// | | | |
// | +----------+----------+ | |
// | | Frame decoder | | |
// | +----------+----------+ | |
// | /|\ | |
// +---------------+-----------------------------------+---------------+
// | | (1) client request \|/
// +---------------+-----------------------------------+---------------+
// | | | |
// | [ Socket.read() ] [ Socket.write() ] |
// | |
// | Netty Internal I/O Threads (Transport Implementation) |
// +-------------------------------------------------------------------+
@Override
public ChannelHandler[] getServerChannelHandlers() {
PartitionRequestQueue queueOfPartitionQueues = new PartitionRequestQueue();
PartitionRequestServerHandler serverHandler = new PartitionRequestServerHandler(
partitionProvider, taskEventDispatcher, queueOfPartitionQueues);
return new ChannelHandler[] {
messageEncoder,
createFrameLengthDecoder(),
messageDecoder,
serverHandler,
queueOfPartitionQueues
};
}
// +-----------+----------+ +----------------------+
// | Remote input channel | | request client |
// +-----------+----------+ +-----------+----------+
// | | (1) write
// +---------------+-----------------------------------+---------------+
// | | CLIENT CHANNEL PIPELINE | |
// | | \|/ |
// | +----------+----------+ +----------------------+ |
// | | Request handler + | Message encoder | |
// | +----------+----------+ +-----------+----------+ |
// | /|\ \|/ |
// | | | |
// | +----------+----------+ | |
// | | Message decoder | | |
// | +----------+----------+ | |
// | /|\ | |
// | | | |
// | +----------+----------+ | |
// | | Frame decoder | | |
// | +----------+----------+ | |
// | /|\ | |
// +---------------+-----------------------------------+---------------+
// | | (3) server response \|/ (2) client request
// +---------------+-----------------------------------+---------------+
// | | | |
// | [ Socket.read() ] [ Socket.write() ] |
// | |
// | Netty Internal I/O Threads (Transport Implementation) |
// +-------------------------------------------------------------------+
@Override
public ChannelHandler[] getClientChannelHandlers() {
return new ChannelHandler[] {
messageEncoder,
createFrameLengthDecoder(),
messageDecoder,
new PartitionRequestClientHandler()};
}
}