| /*
|
| * 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.mina; |
| |
| import java.io.IOException; |
| |
| import org.apache.mina.common.ByteBuffer; |
| import org.apache.mina.common.IoSession; |
| import org.apache.mina.filter.codec.ProtocolCodecFactory; |
| import org.apache.mina.filter.codec.ProtocolDecoder; |
| import org.apache.mina.filter.codec.ProtocolDecoderOutput; |
| import org.apache.mina.filter.codec.ProtocolEncoder; |
| import org.apache.mina.filter.codec.ProtocolEncoderOutput; |
| |
| 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.Channel; |
| import com.alibaba.dubbo.remoting.ChannelHandler; |
| import com.alibaba.dubbo.remoting.Codec; |
| import com.alibaba.dubbo.remoting.exchange.Response; |
| |
| /** |
| * MinaCodecAdapter. |
| * |
| * @author qian.lei |
| */ |
| final class MinaCodecAdapter implements ProtocolCodecFactory { |
| |
| private static final String BUFFER_KEY = MinaCodecAdapter.class.getName() + ".BUFFER"; |
| |
| private final ProtocolEncoder encoder = new InternalEncoder(); |
| |
| private final ProtocolDecoder decoder = new InternalDecoder(); |
| |
| private final Codec upstreamCodec; |
| private final Codec downstreamCodec; |
| |
| private final URL url; |
| |
| private final ChannelHandler handler; |
| |
| private final int bufferSize; |
| |
| public MinaCodecAdapter(Codec codec, URL url, 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 MinaCodecAdapter(Codec upstreamCodec, Codec downstreamCodec, URL url, ChannelHandler handler){ |
| this.upstreamCodec = upstreamCodec; |
| this.downstreamCodec = downstreamCodec; |
| 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 ProtocolEncoder getEncoder() { |
| return encoder; |
| } |
| |
| public ProtocolDecoder getDecoder() { |
| return decoder; |
| } |
| |
| private class InternalEncoder implements ProtocolEncoder { |
| |
| public void dispose(IoSession session) throws Exception { |
| } |
| |
| public void encode(IoSession session, Object msg, ProtocolEncoderOutput out) throws Exception { |
| UnsafeByteArrayOutputStream os = new UnsafeByteArrayOutputStream(1024); // 不需要关闭 |
| MinaChannel channel = MinaChannel.getOrAddChannel(session, url, handler); |
| try { |
| if(!(msg instanceof Response)){ |
| downstreamCodec.encode(channel, os, msg); |
| }else{ |
| upstreamCodec.encode(channel, os, msg); |
| } |
| |
| } finally { |
| MinaChannel.removeChannelIfDisconnectd(session); |
| } |
| out.write(ByteBuffer.wrap(os.toByteArray())); |
| out.flush(); |
| } |
| } |
| |
| private class InternalDecoder implements ProtocolDecoder { |
| |
| public void decode(IoSession session, ByteBuffer in, ProtocolDecoderOutput out) throws Exception { |
| int readable = in.limit(); |
| if (readable <= 0) return; |
| |
| int off, limit; |
| byte[] buf; |
| // load buffer from context. |
| Object[] tmp = (Object[]) session.getAttribute(BUFFER_KEY); |
| if (tmp == null) { |
| buf = new byte[bufferSize]; |
| off = limit = 0; |
| } else { |
| buf = (byte[]) tmp[0]; |
| off = (Integer) tmp[1]; |
| limit = (Integer) tmp[2]; |
| } |
| |
| Channel channel = MinaChannel.getOrAddChannel(session, url, handler); |
| boolean remaining = true; |
| Object msg; |
| UnsafeByteArrayInputStream bis; |
| try { |
| do { |
| // read data into buffer. |
| int read = Math.min(readable, buf.length - limit); |
| in.get(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); |
| off = 0; |
| limit = len; |
| } |
| break; |
| } else { |
| int pos = bis.position(); |
| if (pos == off) { |
| remaining = false; |
| throw new IOException("Decode without read data."); |
| } |
| if (msg != null) { |
| out.write(msg); |
| } |
| 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; |
| } |
| session.setAttribute(BUFFER_KEY, new Object[] { buf, off, limit }); |
| } else { |
| session.removeAttribute(BUFFER_KEY); |
| } |
| MinaChannel.removeChannelIfDisconnectd(session); |
| } |
| } |
| |
| public void dispose(IoSession session) throws Exception { |
| } |
| |
| public void finishDecode(IoSession session, ProtocolDecoderOutput out) throws Exception { |
| } |
| } |
| } |