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.hbase.procedure2; 019 020import java.io.IOException; 021import org.apache.yetus.audience.InterfaceAudience; 022import org.apache.yetus.audience.InterfaceStability; 023 024/** 025 * Special procedure used as a chore. Instead of bringing the Chore class in (dependencies reason), 026 * we reuse the executor timeout thread for this special case. The assumption is that procedure is 027 * used as hook to dispatch other procedures or trigger some cleanups. It does not store state in 028 * the ProcedureStore. this is just for in-memory chore executions. 029 */ 030@InterfaceAudience.Private 031@InterfaceStability.Evolving 032public abstract class ProcedureInMemoryChore<TEnvironment> extends Procedure<TEnvironment> { 033 protected ProcedureInMemoryChore(final int timeoutMsec) { 034 setTimeout(timeoutMsec); 035 } 036 037 protected abstract void periodicExecute(final TEnvironment env); 038 039 @Override 040 protected Procedure<TEnvironment>[] execute(final TEnvironment env) { 041 throw new UnsupportedOperationException(); 042 } 043 044 @Override 045 protected void rollback(final TEnvironment env) { 046 throw new UnsupportedOperationException(); 047 } 048 049 @Override 050 protected boolean abort(final TEnvironment env) { 051 throw new UnsupportedOperationException(); 052 } 053 054 @Override 055 protected void serializeStateData(ProcedureStateSerializer serializer) throws IOException { 056 } 057 058 @Override 059 protected void deserializeStateData(ProcedureStateSerializer serializer) throws IOException { 060 } 061}