| /** |
| * 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 kafka.network |
| |
| import java.net.InetSocketAddress |
| import java.nio.channels._ |
| |
| import kafka.api.RequestOrResponse |
| import kafka.utils.{Logging, nonthreadsafe} |
| import org.apache.kafka.common.network.NetworkReceive |
| |
| |
| object BlockingChannel{ |
| val UseDefaultBufferSize = -1 |
| } |
| |
| /** |
| * A simple blocking channel with timeouts correctly enabled. |
| * |
| */ |
| @nonthreadsafe |
| class BlockingChannel( val host: String, |
| val port: Int, |
| val readBufferSize: Int, |
| val writeBufferSize: Int, |
| val readTimeoutMs: Int ) extends Logging { |
| private var connected = false |
| private var channel: SocketChannel = null |
| private var readChannel: ReadableByteChannel = null |
| private var writeChannel: GatheringByteChannel = null |
| private val lock = new Object() |
| private val connectTimeoutMs = readTimeoutMs |
| private var connectionId: String = "" |
| |
| def connect() = lock synchronized { |
| if(!connected) { |
| try { |
| channel = SocketChannel.open() |
| if(readBufferSize > 0) |
| channel.socket.setReceiveBufferSize(readBufferSize) |
| if(writeBufferSize > 0) |
| channel.socket.setSendBufferSize(writeBufferSize) |
| channel.configureBlocking(true) |
| channel.socket.setSoTimeout(readTimeoutMs) |
| channel.socket.setKeepAlive(true) |
| channel.socket.setTcpNoDelay(true) |
| channel.socket.connect(new InetSocketAddress(host, port), connectTimeoutMs) |
| |
| writeChannel = channel |
| // Need to create a new ReadableByteChannel from input stream because SocketChannel doesn't implement read with timeout |
| // See: http://stackoverflow.com/questions/2866557/timeout-for-socketchannel-doesnt-work |
| readChannel = Channels.newChannel(channel.socket().getInputStream) |
| connected = true |
| val localHost = channel.socket.getLocalAddress.getHostAddress |
| val localPort = channel.socket.getLocalPort |
| val remoteHost = channel.socket.getInetAddress.getHostAddress |
| val remotePort = channel.socket.getPort |
| connectionId = localHost + ":" + localPort + "-" + remoteHost + ":" + remotePort |
| // settings may not match what we requested above |
| val msg = "Created socket with SO_TIMEOUT = %d (requested %d), SO_RCVBUF = %d (requested %d), SO_SNDBUF = %d (requested %d), connectTimeoutMs = %d." |
| debug(msg.format(channel.socket.getSoTimeout, |
| readTimeoutMs, |
| channel.socket.getReceiveBufferSize, |
| readBufferSize, |
| channel.socket.getSendBufferSize, |
| writeBufferSize, |
| connectTimeoutMs)) |
| |
| } catch { |
| case e: Throwable => disconnect() |
| } |
| } |
| } |
| |
| def disconnect() = lock synchronized { |
| if(channel != null) { |
| swallow(channel.close()) |
| swallow(channel.socket.close()) |
| channel = null |
| writeChannel = null |
| } |
| // closing the main socket channel *should* close the read channel |
| // but let's do it to be sure. |
| if(readChannel != null) { |
| swallow(readChannel.close()) |
| readChannel = null |
| } |
| connected = false |
| } |
| |
| def isConnected = connected |
| |
| def send(request: RequestOrResponse): Long = { |
| if(!connected) |
| throw new ClosedChannelException() |
| |
| val send = new RequestOrResponseSend(connectionId, request) |
| send.writeCompletely(writeChannel) |
| } |
| |
| def receive(): NetworkReceive = { |
| if(!connected) |
| throw new ClosedChannelException() |
| |
| val response = readCompletely(readChannel) |
| response.payload().rewind() |
| |
| response |
| } |
| |
| private def readCompletely(channel: ReadableByteChannel): NetworkReceive = { |
| val response = new NetworkReceive |
| while (!response.complete()) |
| response.readFromReadableChannel(channel) |
| response |
| } |
| |
| } |