| /** |
| * 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.hbase.procedure2.store; |
| |
| import java.util.concurrent.CopyOnWriteArrayList; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * Base class for {@link ProcedureStore}s. |
| */ |
| @InterfaceAudience.Private |
| public abstract class ProcedureStoreBase implements ProcedureStore { |
| private final CopyOnWriteArrayList<ProcedureStoreListener> listeners = |
| new CopyOnWriteArrayList<>(); |
| |
| private final AtomicBoolean running = new AtomicBoolean(false); |
| |
| /** |
| * Change the state to 'isRunning', |
| * returns true if the store state was changed, |
| * false if the store was already in that state. |
| * @param isRunning the state to set. |
| * @return true if the store state was changed, otherwise false. |
| */ |
| protected boolean setRunning(boolean isRunning) { |
| return running.getAndSet(isRunning) != isRunning; |
| } |
| |
| @Override |
| public boolean isRunning() { |
| return running.get(); |
| } |
| |
| @Override |
| public void registerListener(ProcedureStoreListener listener) { |
| listeners.add(listener); |
| } |
| |
| @Override |
| public boolean unregisterListener(ProcedureStoreListener listener) { |
| return listeners.remove(listener); |
| } |
| |
| protected final void sendPostSyncSignal() { |
| listeners.forEach(ProcedureStoreListener::postSync); |
| } |
| |
| protected final void sendAbortProcessSignal() { |
| listeners.forEach(ProcedureStoreListener::abortProcess); |
| } |
| |
| protected final void sendForceUpdateSignal(long[] procIds) { |
| listeners.forEach(l -> l.forceUpdate(procIds)); |
| } |
| } |