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/*
 * 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 wvlet.log

import java.util.concurrent.locks.ReentrantLock

/**
  *
  */
trait Guard {
  private[this] val lock     = new ReentrantLock()
  protected def newCondition = lock.newCondition()

  def guard[U](body: => U): U = {
    lock.lockInterruptibly()
    try {
      body
    } finally {
      lock.unlock()
    }
  }
}