| /*
|
| * Copyright 1999-2011 Alibaba Group.
|
| *
|
| * Licensed 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 com.alibaba.dubbo.remoting.transport.netty; |
| |
| import java.io.IOException; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.jboss.netty.buffer.ChannelBuffers; |
| import org.jboss.netty.channel.Channel; |
| import org.jboss.netty.channel.ChannelHandler; |
| import org.jboss.netty.channel.ChannelHandler.Sharable; |
| import org.jboss.netty.channel.ChannelHandlerContext; |
| import org.jboss.netty.channel.Channels; |
| import org.jboss.netty.channel.ExceptionEvent; |
| import org.jboss.netty.channel.MessageEvent; |
| import org.jboss.netty.channel.SimpleChannelUpstreamHandler; |
| import org.jboss.netty.handler.codec.oneone.OneToOneEncoder; |
| |
| import com.alibaba.dubbo.common.Constants; |
| import com.alibaba.dubbo.common.URL; |
| import com.alibaba.dubbo.common.io.Bytes; |
| import com.alibaba.dubbo.common.io.UnsafeByteArrayInputStream; |
| import com.alibaba.dubbo.common.io.UnsafeByteArrayOutputStream; |
| import com.alibaba.dubbo.remoting.Codec; |
| import com.alibaba.dubbo.remoting.exchange.Response; |
| |
| /** |
| * NettyCodecAdapter. |
| * |
| * @author qian.lei |
| */ |
| final class NettyCodecAdapter { |
| |
| private final ChannelHandler encoder = new InternalEncoder(); |
| |
| private final ChannelHandler decoder = new InternalDecoder(); |
| |
| private final Codec upstreamCodec; |
| private final Codec downstreamCodec; |
| |
| private final URL url; |
| |
| private final int bufferSize; |
| |
| private final com.alibaba.dubbo.remoting.ChannelHandler handler; |
| |
| public NettyCodecAdapter(Codec codec, URL url, com.alibaba.dubbo.remoting.ChannelHandler handler){ |
| this(codec, codec, url, handler); |
| } |
| /** |
| * server 端如果有消息发送需要分开codec,默认的上行code是dubbo1兼容的 |
| */ |
| public NettyCodecAdapter(Codec upstreamCodec, Codec downstreamCodec, URL url, com.alibaba.dubbo.remoting.ChannelHandler handler){ |
| this.downstreamCodec = downstreamCodec; |
| this.upstreamCodec = upstreamCodec; |
| this.url = url; |
| this.handler = handler; |
| int b = url.getPositiveParameter(Constants.BUFFER_KEY, Constants.DEFAULT_BUFFER_SIZE);
|
| this.bufferSize = b >= Constants.MIN_BUFFER_SIZE && b <= Constants.MAX_BUFFER_SIZE ? b : Constants.DEFAULT_BUFFER_SIZE; |
| } |
| |
| public ChannelHandler getEncoder() { |
| return encoder; |
| } |
| |
| public ChannelHandler getDecoder() { |
| return decoder; |
| } |
| |
| @Sharable |
| private class InternalEncoder extends OneToOneEncoder { |
| |
| @Override |
| protected Object encode(ChannelHandlerContext ctx, Channel ch, Object msg) throws Exception { |
| UnsafeByteArrayOutputStream os = new UnsafeByteArrayOutputStream(1024); // 不需要关闭 |
| NettyChannel channel = NettyChannel.getOrAddChannel(ch, url, handler); |
| try { |
| if(!(msg instanceof Response)){ |
| downstreamCodec.encode(channel, os, msg); |
| }else { |
| upstreamCodec.encode(channel, os, msg); |
| } |
| |
| } finally { |
| NettyChannel.removeChannelIfDisconnected(ch); |
| } |
| return ChannelBuffers.wrappedBuffer(os.toByteBuffer()); |
| } |
| } |
| |
| private class InternalDecoder extends SimpleChannelUpstreamHandler { |
| |
| private int mOffset = 0, mLimit = 0; |
| |
| private byte[] mBuffer = null; |
| |
| @Override |
| public void messageReceived(ChannelHandlerContext ctx, MessageEvent event) throws Exception { |
| Object o = event.getMessage(); |
| if (! (o instanceof ChannelBuffer)) { |
| ctx.sendUpstream(event); |
| return; |
| } |
| |
| ChannelBuffer input = (ChannelBuffer) o; |
| int readable = input.readableBytes(); |
| if (readable <= 0) { |
| return; |
| } |
| |
| int off, limit; |
| byte[] buf = mBuffer; |
| if (buf == null) { |
| buf = new byte[bufferSize]; |
| off = limit = 0; |
| } else { |
| off = mOffset; |
| limit = mLimit; |
| } |
| |
| NettyChannel channel = NettyChannel.getOrAddChannel(ctx.getChannel(), url, handler); |
| boolean remaining = true; |
| Object msg; |
| UnsafeByteArrayInputStream bis; |
| try { |
| do { |
| // read data into buffer. |
| int read = Math.min(readable, buf.length - limit); |
| input.readBytes(buf, limit, read); |
| limit += read; |
| readable -= read; |
| bis = new UnsafeByteArrayInputStream(buf, off, limit - off); // 不需要关闭 |
| // decode object. |
| do { |
| try { |
| msg = upstreamCodec.decode(channel, bis); |
| } catch (IOException e) { |
| remaining = false; |
| throw e; |
| } |
| if (msg == Codec.NEED_MORE_INPUT) { |
| if (off == 0) { |
| if (readable > 0) { |
| buf = Bytes.copyOf(buf, buf.length << 1); |
| } |
| } else { |
| int len = limit - off; |
| System.arraycopy(buf, off, buf, 0, len); // adjust buffer. |
| off = 0; |
| limit = len; |
| } |
| break; |
| } else { |
| int pos = bis.position(); |
| if (off == pos) { |
| remaining = false; |
| throw new IOException("Decode without read data."); |
| } |
| if (msg != null) { |
| Channels.fireMessageReceived(ctx, msg, event.getRemoteAddress()); |
| } |
| off = pos; |
| } |
| } while (bis.available() > 0); |
| } while (readable > 0); |
| } finally { |
| if (remaining) { |
| int len = limit - off; |
| if (len < buf.length / 2) { |
| System.arraycopy(buf, off, buf, 0, len); |
| off = 0; |
| limit = len; |
| } |
| mBuffer = buf; |
| mOffset = off; |
| mLimit = limit; |
| } else { |
| mBuffer = null; |
| mOffset = mLimit = 0; |
| } |
| NettyChannel.removeChannelIfDisconnected(ctx.getChannel()); |
| } |
| } |
| |
| @Override |
| public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception { |
| ctx.sendUpstream(e); |
| } |
| } |
| } |