| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.dubbo.rpc.proxy; |
| |
| import org.apache.dubbo.common.URL; |
| import org.apache.dubbo.common.logger.Logger; |
| import org.apache.dubbo.common.logger.LoggerFactory; |
| import org.apache.dubbo.rpc.AppResponse; |
| import org.apache.dubbo.rpc.AsyncContextImpl; |
| import org.apache.dubbo.rpc.AsyncRpcResult; |
| import org.apache.dubbo.rpc.Invocation; |
| import org.apache.dubbo.rpc.Invoker; |
| import org.apache.dubbo.rpc.Result; |
| import org.apache.dubbo.rpc.RpcContext; |
| import org.apache.dubbo.rpc.RpcException; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.CompletionException; |
| |
| /** |
| * This Invoker works on provider side, delegates RPC to interface implementation. |
| */ |
| public abstract class AbstractProxyInvoker<T> implements Invoker<T> { |
| Logger logger = LoggerFactory.getLogger(AbstractProxyInvoker.class); |
| |
| 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; |
| } |
| |
| @Override |
| public Class<T> getInterface() { |
| return type; |
| } |
| |
| @Override |
| public URL getUrl() { |
| return url; |
| } |
| |
| @Override |
| public boolean isAvailable() { |
| return true; |
| } |
| |
| @Override |
| public void destroy() { |
| } |
| |
| @Override |
| public Result invoke(Invocation invocation) throws RpcException { |
| try { |
| Object value = doInvoke(proxy, invocation.getMethodName(), invocation.getParameterTypes(), invocation.getArguments()); |
| CompletableFuture<Object> future = wrapWithFuture(value); |
| CompletableFuture<AppResponse> appResponseFuture = future.handle((obj, t) -> { |
| AppResponse result = new AppResponse(); |
| if (t != null) { |
| if (t instanceof CompletionException) { |
| result.setException(t.getCause()); |
| } else { |
| result.setException(t); |
| } |
| } else { |
| result.setValue(obj); |
| } |
| return result; |
| }); |
| return new AsyncRpcResult(appResponseFuture, invocation); |
| } catch (InvocationTargetException e) { |
| if (RpcContext.getContext().isAsyncStarted() && !RpcContext.getContext().stopAsync()) { |
| logger.error("Provider async started, but got an exception from the original method, cannot write the exception back to consumer because an async result may have returned the new thread.", e); |
| } |
| return AsyncRpcResult.newDefaultAsyncResult(null, e.getTargetException(), invocation); |
| } catch (Throwable e) { |
| throw new RpcException("Failed to invoke remote proxy method " + invocation.getMethodName() + " to " + getUrl() + ", cause: " + e.getMessage(), e); |
| } |
| } |
| |
| private CompletableFuture<Object> wrapWithFuture(Object value) { |
| if (RpcContext.getContext().isAsyncStarted()) { |
| return ((AsyncContextImpl)(RpcContext.getContext().getAsyncContext())).getInternalFuture(); |
| } else if (value instanceof CompletableFuture) { |
| return (CompletableFuture<Object>) value; |
| } |
| return CompletableFuture.completedFuture(value); |
| } |
| |
| protected abstract Object doInvoke(T proxy, String methodName, Class<?>[] parameterTypes, Object[] arguments) throws Throwable; |
| |
| @Override |
| public String toString() { |
| return getInterface() + " -> " + (getUrl() == null ? " " : getUrl().toString()); |
| } |
| |
| |
| } |