/*
* 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.rpc.protocol.dubbo;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.io.UnsafeByteArrayInputStream;
import com.alibaba.dubbo.remoting.exchange.support.MultiMessage;
import com.alibaba.dubbo.remoting.Channel;
import com.alibaba.dubbo.remoting.Codec;
import com.alibaba.dubbo.remoting.exchange.Request;
import com.alibaba.dubbo.remoting.exchange.Response;
import com.alibaba.dubbo.remoting.exchange.support.MultiMessage;
import com.alibaba.dubbo.rpc.RpcInvocation;
import com.alibaba.dubbo.rpc.RpcResult;
/**
* @author <a href="mailto:gang.lvg@alibaba-inc.com">kimi</a>
*/
public final class DubboCountCodec implements Codec {
private DubboCodec codec = new DubboCodec();
public void encode(Channel channel, OutputStream output, Object msg) throws IOException {
codec.encode(channel, output, msg);
}
public Object decode(Channel channel, InputStream input) throws IOException {
UnsafeByteArrayInputStream bis = (UnsafeByteArrayInputStream)input;
int save = bis.position();
MultiMessage result = MultiMessage.create();
do {
Object obj = codec.decode(channel, bis);
if (NEED_MORE_INPUT == obj) {
bis.position(save);
break;
} else {
result.addMessage(obj);
logMessageLength(obj, bis.position() - save);
save = bis.position();
}
} while (true);
if (result.isEmpty()) {
return NEED_MORE_INPUT;
}
if (result.size() == 1) {
return result.get(0);
}
return result;
}
private void logMessageLength(Object result, int bytes) {
if (bytes <= 0) { return; }
if (result instanceof Request) {
try {
((RpcInvocation) ((Request) result).getData()).setAttachment(
Constants.INPUT_KEY, String.valueOf(bytes));
} catch (Throwable e) {
/* ignore */
}
} else if (result instanceof Response) {
try {
((RpcResult) ((Response) result).getResult()).setAttachment(
Constants.OUTPUT_KEY, String.valueOf(bytes));
} catch (Throwable e) {
/* ignore */
}
}
}
}