/*
* 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.proxy;
import java.lang.reflect.InvocationTargetException;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.rpc.Invoker;
import com.alibaba.dubbo.rpc.RpcException;
import com.alibaba.dubbo.rpc.Invocation;
import com.alibaba.dubbo.rpc.Result;
import com.alibaba.dubbo.rpc.RpcResult;
/**
* InvokerWrapper
*
* @author william.liangf
*/
public abstract class AbstractProxyInvoker<T> implements Invoker<T> {
private final T proxy;
private final Class<T> type;
private final URL url;
public AbstractProxyInvoker(T proxy, Class<T> type, URL url){
if (proxy == null) {
throw new IllegalArgumentException("proxy == null");
}
if (type == null) {
throw new IllegalArgumentException("interface == null");
}
if (! type.isInstance(proxy)) {
throw new IllegalArgumentException(proxy.getClass().getName() + " not implement interface " + type);
}
this.proxy = proxy;
this.type = type;
this.url = url;
}
public Class<T> getInterface() {
return type;
}
public URL getUrl() {
return url;
}
public boolean isAvailable() {
return true;
}
public void destroy() {
}
public Result invoke(Invocation invocation) throws RpcException {
try {
return new RpcResult(doInvoke(proxy, invocation.getMethodName(), invocation.getParameterTypes(), invocation.getArguments()));
} catch (InvocationTargetException e) {
return new RpcResult(e.getTargetException());
} catch (Throwable e) {
throw new RpcException("Failed to invoke remote proxy " + invocation + " to " + getUrl() + ", cause: " + e.getMessage(), e);
}
}
protected abstract Object doInvoke(T proxy, String methodName, Class<?>[] parameterTypes, Object[] arguments) throws Throwable;
@Override
public String toString() {
return getInterface() + " -> " + getUrl()==null?" ":getUrl().toString();
}
}