/*
* Copyright 1999-2012 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;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.rpc.Exporter;
import com.alibaba.dubbo.rpc.Invocation;
import com.alibaba.dubbo.rpc.Invoker;
import com.alibaba.dubbo.rpc.ProxyFactory;
import com.alibaba.dubbo.rpc.Result;
import com.alibaba.dubbo.rpc.RpcException;
/**
* AbstractProxyProtocol
*
* @author william.liangf
*/
public abstract class AbstractProxyProtocol extends AbstractProtocol {
private final List<Class<?>> rpcExceptions = new CopyOnWriteArrayList<Class<?>>();;
private ProxyFactory proxyFactory;
public AbstractProxyProtocol() {
}
public AbstractProxyProtocol(Class<?>... exceptions) {
for (Class<?> exception : exceptions) {
addRpcException(exception);
}
}
public void addRpcException(Class<?> exception) {
this.rpcExceptions.add(exception);
}
public void setProxyFactory(ProxyFactory proxyFactory) {
this.proxyFactory = proxyFactory;
}
public ProxyFactory getProxyFactory() {
return proxyFactory;
}
@SuppressWarnings("unchecked")
public <T> Exporter<T> export(final Invoker<T> invoker) throws RpcException {
final String uri = serviceKey(invoker.getUrl());
Exporter<T> exporter = (Exporter<T>) exporterMap.get(uri);
if (exporter != null) {
return exporter;
}
final Runnable runnable = doExport(proxyFactory.getProxy(invoker), invoker.getInterface(), invoker.getUrl());
exporter = new AbstractExporter<T>(invoker) {
public void unexport() {
super.unexport();
exporterMap.remove(uri);
if (runnable != null) {
try {
runnable.run();
} catch (Throwable t) {
logger.warn(t.getMessage(), t);
}
}
}
};
exporterMap.put(uri, exporter);
return exporter;
}
public <T> Invoker<T> refer(final Class<T> type, final URL url) throws RpcException {
final Invoker<T> tagert = proxyFactory.getInvoker(doRefer(type, url), type, url);
Invoker<T> invoker = new AbstractInvoker<T>(type, url) {
@Override
protected Result doInvoke(Invocation invocation) throws Throwable {
try {
Result result = tagert.invoke(invocation);
Throwable e = result.getException();
if (e != null) {
for (Class<?> rpcException : rpcExceptions) {
if (rpcException.isAssignableFrom(e.getClass())) {
throw getRpcException(type, url, invocation, e);
}
}
}
return result;
} catch (RpcException e) {
if (e.getCode() == RpcException.UNKNOWN_EXCEPTION) {
e.setCode(getErrorCode(e.getCause()));
}
throw e;
} catch (Throwable e) {
throw getRpcException(type, url, invocation, e);
}
}
};
invokers.add(invoker);
return invoker;
}
protected RpcException getRpcException(Class<?> type, URL url, Invocation invocation, Throwable e) {
RpcException re = new RpcException("Failed to invoke remote service: " + type + ", method: "
+ invocation.getMethodName() + ", cause: " + e.getMessage(), e);
re.setCode(getErrorCode(e));
return re;
}
protected int getErrorCode(Throwable e) {
return RpcException.UNKNOWN_EXCEPTION;
}
protected abstract <T> Runnable doExport(T impl, Class<T> type, URL url) throws RpcException;
protected abstract <T> T doRefer(Class<T> type, URL url) throws RpcException;
}