001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.ha; 019 020import java.io.IOException; 021 022import org.apache.hadoop.classification.InterfaceAudience; 023import org.apache.hadoop.classification.InterfaceStability; 024import org.apache.hadoop.ha.HAServiceProtocol.StateChangeRequestInfo; 025import org.apache.hadoop.ipc.RemoteException; 026 027/** 028 * Helper for making {@link HAServiceProtocol} RPC calls. This helper 029 * unwraps the {@link RemoteException} to specific exceptions. 030 */ 031@InterfaceAudience.Public 032@InterfaceStability.Evolving 033public class HAServiceProtocolHelper { 034 public static void monitorHealth(HAServiceProtocol svc, 035 StateChangeRequestInfo reqInfo) 036 throws IOException { 037 try { 038 svc.monitorHealth(); 039 } catch (RemoteException e) { 040 throw e.unwrapRemoteException(HealthCheckFailedException.class); 041 } 042 } 043 044 public static void transitionToActive(HAServiceProtocol svc, 045 StateChangeRequestInfo reqInfo) 046 throws IOException { 047 try { 048 svc.transitionToActive(reqInfo); 049 } catch (RemoteException e) { 050 throw e.unwrapRemoteException(ServiceFailedException.class); 051 } 052 } 053 054 public static void transitionToStandby(HAServiceProtocol svc, 055 StateChangeRequestInfo reqInfo) 056 throws IOException { 057 try { 058 svc.transitionToStandby(reqInfo); 059 } catch (RemoteException e) { 060 throw e.unwrapRemoteException(ServiceFailedException.class); 061 } 062 } 063}