/*
    * Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com>
    * and other copyright owners as documented in the project's IP log.
    *
    * This program and the accompanying materials are made available
    * under the terms of the Eclipse Distribution License v1.0 which
    * accompanies this distribution, is reproduced below, and is
    * available at http://www.eclipse.org/org/documents/edl-v10.php
    *
   * 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 the Eclipse Foundation, Inc. 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,
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   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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  package org.eclipse.jgit.benchmarks;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.concurrent.TimeUnit;
  
  import org.eclipse.jgit.internal.storage.file.FileSnapshot;
  import org.eclipse.jgit.util.FileUtils;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Measurement;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.Setup;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.TearDown;
  import org.openjdk.jmh.annotations.Warmup;
  import org.openjdk.jmh.runner.Runner;
  import org.openjdk.jmh.runner.RunnerException;
  import org.openjdk.jmh.runner.options.Options;
  import org.openjdk.jmh.runner.options.OptionsBuilder;
  
  @State(Scope.Thread)
  public class CreateFileSnapshotBenchmark {
  
  	Path path;
  
  	Path testDir;
  
  	@Setup
  	public void setupBenchmark() throws IOException {
  		testDir = Files.createTempDirectory("dir");
  		path = testDir.resolve("toSnapshot");
  		Files.createFile(path);
  	}
  
  	@TearDown
  	public void teardown() throws IOException {
  		FileUtils.delete(testDir.toFile(), FileUtils.RECURSIVE | FileUtils.RETRY);
  	}
  
  	@Benchmark
  	@BenchmarkMode({ Mode.AverageTime })
  	@OutputTimeUnit(TimeUnit.NANOSECONDS)
      @Warmup(iterations = 5, time = 100, timeUnit = TimeUnit.MILLISECONDS)
      @Measurement(iterations = 5, time = 100, timeUnit = TimeUnit.MILLISECONDS)
  	public Path testCreateFile() throws IOException {
  		return Files.createTempFile(testDir, "create", "");
  	}
  
  	@Benchmark
  	@BenchmarkMode({ Mode.AverageTime })
  	@OutputTimeUnit(TimeUnit.NANOSECONDS)
  	public FileSnapshot testCreateFileSnapshot() {
  		return FileSnapshot.save(path.toFile());
 	}
 
 	public static void main(String[] args) throws RunnerException {
 		Options opt = new OptionsBuilder()
 				.include(CreateFileSnapshotBenchmark.class.getSimpleName())
 				// .addProfiler(StackProfiler.class)
 				// .addProfiler(GCProfiler.class)
 				.forks(1).jvmArgs("-ea").build();
 		new Runner(opt).run();
 	}
 }