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/*
 * Copyright 2016 the original author or authors.
 *
 * 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.testifyproject.failsafe.util.concurrent;

import java.util.concurrent.Callable;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

import org.testifyproject.failsafe.internal.util.Assert;

/**
 * {@link Scheduler} utilities.
 * 
 * @author Jonathan Halterman
 * @see org.testifyproject.failsafe.util.concurrent.DefaultScheduledFuture
 */
public final class Schedulers {
  private Schedulers() {
  }

  /**
   * Returns a Scheduler adapted from the {@code executor}.
   * 
   * @throws NullPointerException if {@code executor} is null
   */
  public static Scheduler of(final ScheduledExecutorService executor) {
    Assert.notNull(executor, "executor");
    return new Scheduler() {
      @Override
      public ScheduledFuture schedule(Callable callable, long delay, TimeUnit unit) {
        return executor.schedule(callable, delay, unit);
      }
    };
  }
}