/*
* 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;
import java.io.IOException;
import java.net.InetSocketAddress;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.extension.ExtensionLoader;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.common.serialize.Serialization;
import com.alibaba.dubbo.common.utils.NetUtils;
import com.alibaba.dubbo.remoting.Channel;
import com.alibaba.dubbo.remoting.Codec;
/**
* AbstractCodec
*
* @author william.liangf
*/
public abstract class AbstractCodec implements Codec {
private final Logger logger = LoggerFactory.getLogger(getClass());
protected Serialization getSerialization(Channel channel) {
Serialization serialization = ExtensionLoader.getExtensionLoader(Serialization.class).getExtension(channel.getUrl().getParameter(Constants.SERIALIZATION_KEY, Constants.DEFAULT_REMOTING_SERIALIZATION));
return serialization;
}
protected void checkPayload(Channel channel, long size) throws IOException {
int payload = Constants.DEFAULT_PAYLOAD;
if (channel != null && channel.getUrl() != null) {
payload = channel.getUrl().getPositiveParameter(Constants.PAYLOAD_KEY, Constants.DEFAULT_PAYLOAD);
}
if (size > payload) {
IOException e = new IOException("Data length too large: " + size + ", max payload: " + payload + ", channel: " + channel);
logger.error(e);
throw e;
}
}
protected boolean isClientSide(Channel channel) {
String side = (String) channel.getAttribute(Constants.SIDE_KEY);
if ("client".equals(side)) {
return true;
} else if ("server".equals(side)) {
return false;
} else {
InetSocketAddress address = channel.getRemoteAddress();
URL url = channel.getUrl();
boolean client = url.getPort() == address.getPort() &&
NetUtils.filterLocalHost(url.getIp())
.equals(NetUtils.filterLocalHost(address.getAddress().getHostAddress()));
channel.setAttribute(Constants.SIDE_KEY, client ? "client" : "server");
return client;
}
}
protected boolean isServerSide(Channel channel) {
return ! isClientSide(channel);
}
}