network/server/NoOpRpcHandler.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package org.apache.spark.network.server;
0019
0020 import java.nio.ByteBuffer;
0021
0022 import org.apache.spark.network.client.RpcResponseCallback;
0023 import org.apache.spark.network.client.TransportClient;
0024
0025 /** An RpcHandler suitable for a client-only TransportContext, which cannot receive RPCs. */
0026 public class NoOpRpcHandler extends RpcHandler {
0027   private final StreamManager streamManager;
0028
0029   public NoOpRpcHandler() {
0030     streamManager = new OneForOneStreamManager();
0031   }
0032
0033   @Override
0034   public void receive(TransportClient client, ByteBuffer message, RpcResponseCallback callback) {
0035     throw new UnsupportedOperationException("Cannot handle messages");
0036   }
0037
0038   @Override
0039   public StreamManager getStreamManager() { return streamManager; }
0040 }