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Miscellaneous utilities for Java 8
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/*
 * Copyright (c) 2019 by Andrew Charneski.
 *
 * The author 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 com.simiacryptus.lang;

import javax.annotation.Nullable;
import java.lang.management.ManagementFactory;

/**
 * The type Timed result.
 *
 * @param  the type parameter
 */
public class TimedResult {
  /**
   * The Obj.
   */
  public final T result;
  /**
   * The Time nanos.
   */
  public final long timeNanos;
  /**
   * The Gc ms.
   */
  public final long gcMs;

  /**
   * Instantiates a new Timed result.
   *
   * @param result    the obj
   * @param timeNanos the time nanos
   * @param gcMs      the gc ms
   */
  public TimedResult(final T result, final long timeNanos, long gcMs) {
    this.result = result;
    this.timeNanos = timeNanos;
    this.gcMs = gcMs;
  }

  /**
   * Time timed result.
   *
   * @param  the type parameter
   * @param fn  the fn
   * @return the timed result
   */
  public static  com.simiacryptus.lang.TimedResult time(@javax.annotation.Nonnull final UncheckedSupplier fn) {
    long priorGcMs = ManagementFactory.getGarbageCollectorMXBeans().stream().mapToLong(x -> x.getCollectionTime()).sum();
    final long start = System.nanoTime();
    @Nullable T result = null;
    try {
      result = fn.get();
    } catch (@javax.annotation.Nonnull final RuntimeException e) {
      throw e;
    } catch (@javax.annotation.Nonnull final Exception e) {
      throw new RuntimeException(e);
    }
    long wallClockTime = System.nanoTime() - start;
    long gcTime = ManagementFactory.getGarbageCollectorMXBeans().stream().mapToLong(x -> x.getCollectionTime()).sum() - priorGcMs;
    return new com.simiacryptus.lang.TimedResult(result, wallClockTime, gcTime);
  }

  /**
   * Time timed result.
   *
   * @param  the type parameter
   * @param fn  the fn
   * @return the timed result
   */
  public static  com.simiacryptus.lang.TimedResult time(@javax.annotation.Nonnull final UncheckedRunnable fn) {
    long priorGcMs = ManagementFactory.getGarbageCollectorMXBeans().stream().mapToLong(x -> x.getCollectionTime()).sum();
    final long start = System.nanoTime();
    try {
      fn.get();
    } catch (@javax.annotation.Nonnull final RuntimeException e) {
      throw e;
    } catch (@javax.annotation.Nonnull final Exception e) {
      throw new RuntimeException(e);
    }
    long wallClockTime = System.nanoTime() - start;
    long gcTime = ManagementFactory.getGarbageCollectorMXBeans().stream().mapToLong(x -> x.getCollectionTime()).sum() - priorGcMs;
    return new com.simiacryptus.lang.TimedResult(null, wallClockTime, gcTime);
  }

  /**
   * Seconds double.
   *
   * @return the double
   */
  public double seconds() {
    return timeNanos / 1e9;
  }

  /**
   * Gc seconds double.
   *
   * @return the double
   */
  public double gc_seconds() {
    return gcMs / 1e3;
  }
}