| /* |
| * 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. |
| */ |
| /* |
| * Written by Doug Lea with assistance from members of JCP JSR-166 Expert Group and released to the |
| * public domain, as explained at http://creativecommons.org/licenses/publicdomain |
| */ |
| |
| package org.apache.geode.internal.util.concurrent; |
| |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| import org.apache.geode.CancelCriterion; |
| import org.apache.geode.internal.Assert; |
| |
| /** |
| * Instances of {@link java.util.concurrent.locks.ReentrantReadWriteLock} that respond to |
| * cancellation |
| * |
| */ |
| public class StoppableReentrantReadWriteLock implements /* ReadWriteLock, */ java.io.Serializable { |
| private static final long serialVersionUID = -1185707921434766946L; |
| |
| /** |
| * The underlying read lock |
| */ |
| private final transient StoppableReadLock readLock; |
| |
| /** |
| * the underlying write lock |
| */ |
| private final transient StoppableWriteLock writeLock; |
| |
| /** |
| * This is how often waiters will wake up to check for cancellation |
| */ |
| private static final long RETRY_TIME = 15 * 1000; // milliseconds |
| |
| /** |
| * Create a new instance |
| * |
| * @param stopper the cancellation criterion |
| */ |
| public StoppableReentrantReadWriteLock(CancelCriterion stopper) { |
| this(new ReentrantReadWriteLock(), stopper); |
| } |
| |
| protected StoppableReentrantReadWriteLock(ReadWriteLock lock, CancelCriterion stopper) { |
| Assert.assertTrue(stopper != null); |
| this.readLock = new StoppableReadLock(lock, stopper); |
| this.writeLock = new StoppableWriteLock(lock, stopper); |
| } |
| |
| /** |
| * @return the read lock |
| */ |
| public StoppableReadLock readLock() { |
| return readLock; |
| } |
| |
| /** |
| * @return the write lock |
| */ |
| public StoppableWriteLock writeLock() { |
| return writeLock; |
| } |
| |
| /** |
| * read locks that are stoppable |
| */ |
| public static class StoppableReadLock { |
| |
| private final Lock lock; |
| private final CancelCriterion stopper; |
| |
| /** |
| * Create a new read lock from the given lock |
| * |
| * @param lock the lock to be used |
| * @param stopper the cancellation criterion |
| */ |
| StoppableReadLock(ReadWriteLock lock, CancelCriterion stopper) { |
| this.lock = lock.readLock(); |
| this.stopper = stopper; |
| } |
| |
| public void lock() { |
| boolean interrupted = Thread.interrupted(); |
| try { |
| for (;;) { |
| try { |
| lockInterruptibly(); |
| break; |
| } catch (InterruptedException e) { |
| interrupted = true; |
| } |
| } // for |
| } finally { |
| if (interrupted) |
| Thread.currentThread().interrupt(); |
| } |
| } |
| |
| public void lockInterruptibly() throws InterruptedException { |
| for (;;) { |
| stopper.checkCancelInProgress(null); |
| if (lock.tryLock(RETRY_TIME, TimeUnit.MILLISECONDS)) |
| break; |
| } |
| } |
| |
| /** |
| * @return true if the lock was acquired |
| */ |
| public boolean tryLock() { |
| stopper.checkCancelInProgress(null); |
| return lock.tryLock(); |
| } |
| |
| /** |
| * @param timeout how long to wait |
| * @return true if the lock was acquired |
| */ |
| public boolean tryLock(long timeout) throws InterruptedException { |
| stopper.checkCancelInProgress(null); |
| return lock.tryLock(timeout, TimeUnit.MILLISECONDS); |
| } |
| |
| public void unlock() { |
| lock.unlock(); |
| } |
| |
| // /** |
| // * @return the new condition |
| // */ |
| // public StoppableCondition newCondition() { |
| // return new StoppableCondition(lock.newCondition(), stopper); |
| // } |
| } |
| |
| public static class StoppableWriteLock { |
| |
| /** |
| * The underlying write lock |
| */ |
| private final Lock lock; |
| |
| /** |
| * the cancellation criterion |
| */ |
| private final CancelCriterion stopper; |
| |
| /** |
| * Create a new instance |
| * |
| * @param lock the underlying lock |
| */ |
| public StoppableWriteLock(ReadWriteLock lock, CancelCriterion stopper) { |
| this.lock = lock.writeLock(); |
| this.stopper = stopper; |
| } |
| |
| public void lock() { |
| boolean interrupted = Thread.interrupted(); |
| try { |
| for (;;) { |
| try { |
| lockInterruptibly(); |
| break; |
| } catch (InterruptedException e) { |
| interrupted = true; |
| } |
| } // for |
| } finally { |
| if (interrupted) |
| Thread.currentThread().interrupt(); |
| } |
| } |
| |
| public void lockInterruptibly() throws InterruptedException { |
| for (;;) { |
| stopper.checkCancelInProgress(null); |
| if (lock.tryLock(RETRY_TIME, TimeUnit.MILLISECONDS)) |
| break; |
| } |
| } |
| |
| /** |
| * @return true if the lock was acquired |
| */ |
| public boolean tryLock() { |
| stopper.checkCancelInProgress(null); |
| return lock.tryLock(); |
| } |
| |
| /** |
| * @param timeout how long to wait |
| * @return true if the lock was required |
| */ |
| public boolean tryLock(long timeout) throws InterruptedException { |
| stopper.checkCancelInProgress(null); |
| return lock.tryLock(timeout, TimeUnit.MILLISECONDS); |
| } |
| |
| public void unlock() { |
| lock.unlock(); |
| } |
| |
| // /** |
| // * @return the new condition |
| // */ |
| // public StoppableCondition newCondition() { |
| // return new StoppableCondition(lock.newCondition(), stopper); |
| // } |
| |
| } |
| } |