Java tutorial
/** * 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.ratis.hadooprpc; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.ipc.ProtobufRpcEngineShaded; import org.apache.hadoop.ipc.RPC; import org.apache.hadoop.net.NetUtils; import org.apache.hadoop.security.UserGroupInformation; import java.io.Closeable; import java.io.IOException; public class Proxy<PROTOCOL> implements Closeable { public static <PROTOCOL> PROTOCOL getProxy(Class<PROTOCOL> clazz, String addressStr, Configuration conf) throws IOException { RPC.setProtocolEngine(conf, clazz, ProtobufRpcEngineShaded.class); return RPC.getProxy(clazz, RPC.getProtocolVersion(clazz), org.apache.ratis.util.NetUtils.createSocketAddr(addressStr), UserGroupInformation.getCurrentUser(), conf, NetUtils.getSocketFactory(conf, clazz)); } private final PROTOCOL protocol; public Proxy(Class<PROTOCOL> clazz, String addressStr, Configuration conf) throws IOException { this.protocol = getProxy(clazz, addressStr, conf); } public PROTOCOL getProtocol() { return protocol; } @Override public void close() { RPC.stopProxy(protocol); } }