/*

* Licensed 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.lance;

import java.util.concurrent.locks.ReentrantReadWriteLock;

/** The LockManager class provides a way to manage read and write locks. */

public class LockManager {

private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();

/**

* Represents a read lock for the LockManager. This lock allows multiple threads to read

* concurrently, but prevents write access.

*/

public class ReadLock implements AutoCloseable {

/** Acquires a read lock on the lock manager. */

public ReadLock() {

lock.readLock().lock();

}

@Override

public void close() {

lock.readLock().unlock();

}

}

/** Represents a write lock that can be acquired and released. */

public class WriteLock implements AutoCloseable {

/** Constructs a new WriteLock and acquires the write lock. */

public WriteLock() {

lock.writeLock().lock();

}

@Override

public void close() {

lock.writeLock().unlock();

}

}

/**

* Acquires a read lock on the LockManager.

*

* @return the acquired ReadLock object

*/

public ReadLock acquireReadLock() {

return new ReadLock();

}

/**

* Acquires a write lock on the LockManager.

*

* @return the acquired WriteLock object

*/

public WriteLock acquireWriteLock() {

return new WriteLock();

}

}