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/**
 * Copyright (c) 2013, impossibl.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of impossibl.com nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
/*-------------------------------------------------------------------------
 *
 * Copyright (c) 2004-2011, PostgreSQL Global Development Group
 *
 *
 *-------------------------------------------------------------------------
 */
package com.impossibl.postgres.utils;

import java.util.concurrent.TimeUnit;

import static java.util.concurrent.TimeUnit.MILLISECONDS;

public class Await {

  public interface InterruptibleTimeoutFunction {
    boolean await(long timeout, TimeUnit timeoutUnits) throws InterruptedException;
  }

  public interface InterruptibleFunction {
    void await() throws InterruptedException;
  }

  public static boolean awaitUninterruptibly(long timeout, TimeUnit timeoutUnits, InterruptibleTimeoutFunction waiter) {

    if (timeout < 1) {
      timeout = Long.MAX_VALUE;
    }

    while (timeout > 0) {

      long start = System.currentTimeMillis();

      try {

        return waiter.await(timeout, timeoutUnits);

      }
      catch (InterruptedException e) {
        // Ignore
      }

      timeout -= timeoutUnits.convert(System.currentTimeMillis() - start, MILLISECONDS);

    }

    return false;
  }

  public static void awaitUninterruptibly(InterruptibleFunction waiter) {

    while (true) {

      try {

        waiter.await();

        return;
      }
      catch (InterruptedException e) {
        // Ignore
      }

    }

  }

}