| /* |
| * 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 com.alibaba.dubbo.rpc.protocol.dubbo; |
| |
| import com.alibaba.dubbo.common.Constants; |
| import com.alibaba.dubbo.common.URL; |
| import com.alibaba.dubbo.common.utils.AtomicPositiveInteger; |
| import com.alibaba.dubbo.common.utils.ConfigUtils; |
| import com.alibaba.dubbo.remoting.RemotingException; |
| import com.alibaba.dubbo.remoting.TimeoutException; |
| import com.alibaba.dubbo.remoting.exchange.ExchangeClient; |
| import com.alibaba.dubbo.remoting.exchange.ResponseFuture; |
| import com.alibaba.dubbo.rpc.Invocation; |
| import com.alibaba.dubbo.rpc.Invoker; |
| import com.alibaba.dubbo.rpc.Result; |
| import com.alibaba.dubbo.rpc.RpcContext; |
| import com.alibaba.dubbo.rpc.RpcException; |
| import com.alibaba.dubbo.rpc.RpcInvocation; |
| import com.alibaba.dubbo.rpc.RpcResult; |
| import com.alibaba.dubbo.rpc.protocol.AbstractInvoker; |
| import com.alibaba.dubbo.rpc.support.RpcUtils; |
| |
| import java.util.Set; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| /** |
| * DubboInvoker |
| */ |
| public class DubboInvoker<T> extends AbstractInvoker<T> { |
| |
| private final ExchangeClient[] clients; |
| |
| private final AtomicPositiveInteger index = new AtomicPositiveInteger(); |
| |
| private final String version; |
| |
| private final ReentrantLock destroyLock = new ReentrantLock(); |
| |
| private final Set<Invoker<?>> invokers; |
| |
| public DubboInvoker(Class<T> serviceType, URL url, ExchangeClient[] clients) { |
| this(serviceType, url, clients, null); |
| } |
| |
| public DubboInvoker(Class<T> serviceType, URL url, ExchangeClient[] clients, Set<Invoker<?>> invokers) { |
| super(serviceType, url, new String[]{Constants.INTERFACE_KEY, Constants.GROUP_KEY, Constants.TOKEN_KEY, Constants.TIMEOUT_KEY}); |
| this.clients = clients; |
| // get version. |
| this.version = url.getParameter(Constants.VERSION_KEY, "0.0.0"); |
| this.invokers = invokers; |
| } |
| |
| @Override |
| protected Result doInvoke(final Invocation invocation) throws Throwable { |
| RpcInvocation inv = (RpcInvocation) invocation; |
| final String methodName = RpcUtils.getMethodName(invocation); |
| inv.setAttachment(Constants.PATH_KEY, getUrl().getPath()); |
| inv.setAttachment(Constants.VERSION_KEY, version); |
| |
| ExchangeClient currentClient; |
| if (clients.length == 1) { |
| currentClient = clients[0]; |
| } else { |
| currentClient = clients[index.getAndIncrement() % clients.length]; |
| } |
| try { |
| boolean isAsync = RpcUtils.isAsync(getUrl(), invocation); |
| boolean isOneway = RpcUtils.isOneway(getUrl(), invocation); |
| int timeout = getUrl().getMethodParameter(methodName, Constants.TIMEOUT_KEY, Constants.DEFAULT_TIMEOUT); |
| if (isOneway) { |
| boolean isSent = getUrl().getMethodParameter(methodName, Constants.SENT_KEY, false); |
| currentClient.send(inv, isSent); |
| RpcContext.getContext().setFuture(null); |
| return new RpcResult(); |
| } else if (isAsync) { |
| ResponseFuture future = currentClient.request(inv, timeout); |
| RpcContext.getContext().setFuture(new FutureAdapter<Object>(future)); |
| return new RpcResult(); |
| } else { |
| RpcContext.getContext().setFuture(null); |
| return (Result) currentClient.request(inv, timeout).get(); |
| } |
| } catch (TimeoutException e) { |
| throw new RpcException(RpcException.TIMEOUT_EXCEPTION, "Invoke remote method timeout. method: " + invocation.getMethodName() + ", provider: " + getUrl() + ", cause: " + e.getMessage(), e); |
| } catch (RemotingException e) { |
| throw new RpcException(RpcException.NETWORK_EXCEPTION, "Failed to invoke remote method: " + invocation.getMethodName() + ", provider: " + getUrl() + ", cause: " + e.getMessage(), e); |
| } |
| } |
| |
| @Override |
| public boolean isAvailable() { |
| if (!super.isAvailable()) |
| return false; |
| for (ExchangeClient client : clients) { |
| if (client.isConnected() && !client.hasAttribute(Constants.CHANNEL_ATTRIBUTE_READONLY_KEY)) { |
| //cannot write == not Available ? |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public void destroy() { |
| // in order to avoid closing a client multiple times, a counter is used in case of connection per jvm, every |
| // time when client.close() is called, counter counts down once, and when counter reaches zero, client will be |
| // closed. |
| if (super.isDestroyed()) { |
| return; |
| } else { |
| // double check to avoid dup close |
| destroyLock.lock(); |
| try { |
| if (super.isDestroyed()) { |
| return; |
| } |
| super.destroy(); |
| if (invokers != null) { |
| invokers.remove(this); |
| } |
| for (ExchangeClient client : clients) { |
| try { |
| client.close(ConfigUtils.getServerShutdownTimeout()); |
| } catch (Throwable t) { |
| logger.warn(t.getMessage(), t); |
| } |
| } |
| |
| } finally { |
| destroyLock.unlock(); |
| } |
| } |
| } |
| } |