/*
 * 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.zeppelin.notebook.repo;

import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * wrap ReentrantReadWriteLock with Closeable interface, to avoid
 * call lock's close() method every time.
 */
public class AutoReadWriteLock {

  private final ReentrantReadWriteLock rwlock;

  public AutoReadWriteLock() {
    this(new ReentrantReadWriteLock());
  }

  public AutoReadWriteLock(ReentrantReadWriteLock rwlock) {
    this.rwlock = rwlock;
  }

  public AutoLock lockForRead() {
    rwlock.readLock().lock();
    return new AutoLock() {
      @Override
      public void close() {
        rwlock.readLock().unlock();
      }
    };
  }

  public AutoLock lockForWrite() {
    rwlock.writeLock().lock();
    return new AutoLock() {
      @Override
      public void close() {
        rwlock.writeLock().unlock();
      }
    };
  }
}
