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63 changes: 63 additions & 0 deletions
63
client/src/main/java/org/apache/rocketmq/client/lock/ReadWriteCASLock.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /* | ||
| * 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.rocketmq.client.lock; | ||
|
|
||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
|
|
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| public class ReadWriteCASLock { | ||
| //true : can lock ; false : not lock | ||
| private final AtomicBoolean writeLock = new AtomicBoolean(true); | ||
|
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| private final AtomicInteger readLock = new AtomicInteger(0); | ||
|
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| public void acquireWriteLock() { | ||
| boolean isLock = false; | ||
| do { | ||
| isLock = writeLock.compareAndSet(true, false); | ||
| } while (!isLock); | ||
|
|
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| do { | ||
| isLock = readLock.get() == 0; | ||
| } while (!isLock); | ||
| } | ||
|
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| public void releaseWriteLock() { | ||
| this.writeLock.compareAndSet(false, true); | ||
| } | ||
|
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| public void acquireReadLock() { | ||
| boolean isLock = false; | ||
| do { | ||
| isLock = writeLock.get(); | ||
| } while (!isLock); | ||
| readLock.getAndIncrement(); | ||
| } | ||
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| public void releaseReadLock() { | ||
| this.readLock.getAndDecrement(); | ||
| } | ||
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| public boolean getWriteLock() { | ||
| return this.writeLock.get() && this.readLock.get() == 0; | ||
| } | ||
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| public boolean getReadLock() { | ||
| return this.writeLock.get(); | ||
| } | ||
|
|
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| } |
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