| /** |
| * 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.hadoop.yarn.server.nodemanager.amrmproxy; |
| |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.yarn.server.api.DistributedSchedulingAMProtocol; |
| |
| /** |
| * Defines the contract to be implemented by the request intercepter classes, |
| * that can be used to intercept and inspect messages sent from the application |
| * master to the resource manager. |
| */ |
| public interface RequestInterceptor extends DistributedSchedulingAMProtocol, |
| Configurable { |
| /** |
| * This method is called for initializing the intercepter. This is guaranteed |
| * to be called only once in the lifetime of this instance. |
| * |
| * @param ctx |
| */ |
| void init(AMRMProxyApplicationContext ctx); |
| |
| /** |
| * This method is called to release the resources held by the intercepter. |
| * This will be called when the application pipeline is being destroyed. The |
| * concrete implementations should dispose the resources and forward the |
| * request to the next intercepter, if any. |
| */ |
| void shutdown(); |
| |
| /** |
| * Sets the next intercepter in the pipeline. The concrete implementation of |
| * this interface should always pass the request to the nextInterceptor after |
| * inspecting the message. The last intercepter in the chain is responsible to |
| * send the messages to the resource manager service and so the last |
| * intercepter will not receive this method call. |
| * |
| * @param nextInterceptor |
| */ |
| void setNextInterceptor(RequestInterceptor nextInterceptor); |
| |
| /** |
| * Returns the next intercepter in the chain. |
| * |
| * @return the next intercepter in the chain |
| */ |
| RequestInterceptor getNextInterceptor(); |
| |
| /** |
| * Returns the context. |
| * |
| * @return the context |
| */ |
| AMRMProxyApplicationContext getApplicationContext(); |
| } |