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/* Copyright (c) 2008-2023, Nathan Sweet
 * 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 Esoteric Software 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 HOLDER 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
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package com.esotericsoftware.kryo.benchmarks;

import com.esotericsoftware.kryo.util.CuckooObjectMap;
import com.esotericsoftware.kryo.util.IdentityMap;
import com.esotericsoftware.kryo.util.ObjectMap;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.infra.Blackhole;

import net.bytebuddy.ByteBuddy;

public class MapBenchmark {

	@Benchmark
	public void read (ReadBenchmarkState state, Blackhole blackhole) {
		state.read(blackhole);
	}

	@Benchmark
	public void miss (MissBenchmarkState state, Blackhole blackhole) {
		state.miss(blackhole);
	}

	@Benchmark
	public void write (WriteBenchmarkState state, Blackhole blackhole) {
		state.write(blackhole);
	}

	@Benchmark
	public void writeRead (WriteBenchmarkState state, Blackhole blackhole) {
		state.readWrite(blackhole);
	}

	@State(Scope.Thread)
	public static class AbstractBenchmarkState {
		@Param({"object", "identity", "cuckoo", "hash"}) public MapType mapType;
		@Param({"integers", "strings", "classes"}) public DataSource dataSource;
		@Param({"100", "500", "1000", "2500", "5000", "10000"}) public int numClasses;
		@Param({"51"}) public int initialCapacity;
		@Param({"0.7", "0.75", "0.8"}) public float loadFactor;
		@Param({"8192"}) public int maxCapacity;

		MapAdapter map;
		List data;
	}

	@State(Scope.Thread)
	public static class ReadBenchmarkState extends AbstractBenchmarkState {

		final Random random = new Random(123L);

		@Setup(Level.Trial)
		public void setup () {
			map = createMap(mapType, initialCapacity, loadFactor, maxCapacity);
			data = dataSource.buildData(random, numClasses);
			data.forEach(c -> map.put(c, 1));
			Collections.shuffle(data);
		}

		public void read (Blackhole blackhole) {
			data.stream()
				.limit(numClasses)
				.map(map::get)
				.forEach(blackhole::consume);
		}
	}

	@State(Scope.Thread)
	public static class MissBenchmarkState extends AbstractBenchmarkState {

		final Random random = new Random(123L);
		
		private List moreData;

		@Setup(Level.Trial)
		public void setup () {
			map = createMap(mapType, initialCapacity, loadFactor, maxCapacity);
			data = dataSource.buildData(random, numClasses);
			data.forEach(c -> map.put(c, 1));
			moreData = dataSource.buildData(random, numClasses);
		}

		public void miss (Blackhole blackhole) {
			moreData.stream()
					.map(map::get)
					.forEach(blackhole::consume);
		}
	}

	@State(Scope.Thread)
	public static class WriteBenchmarkState extends AbstractBenchmarkState {

		final Random random = new Random(123L);

		@Setup(Level.Trial)
		public void setup () {
			map = createMap(mapType, initialCapacity, loadFactor, maxCapacity);
			data = dataSource.buildData(random, numClasses);
			Collections.shuffle(data);
		}

		public void write (Blackhole blackhole) {
			data.stream()
				.map(c -> map.put(c, 1))
				.forEach(blackhole::consume);
		}

		public void readWrite (Blackhole blackhole) {
			data.forEach(c -> map.put(c, 1));
			Collections.shuffle(data);

			data.stream()
				.limit(numClasses)
				.map(map::get)
				.forEach(blackhole::consume);
			map.clear();
		}
	}

	public enum MapType {
		object, identity, cuckoo, hash
	}

	public enum DataSource {
		integers {
			Object getData (Random random) {
				return random.nextInt();
			}
		},
		strings {
			Object getData (Random random) {
				int leftLimit = 97; // 'a'
				int rightLimit = 122; // 'z'
				int low = 10;
				int high = 100;
				int length = random.nextInt(high-low) + low;
				return random.ints(leftLimit, rightLimit + 1)
					.limit(length)
					.collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
					.toString();
			}
		},
		classes {
			Object getData (Random random) {
				return new ByteBuddy()
					.subclass(Object.class)
					.make()
					.load(MapBenchmark.class.getClassLoader())
					.getLoaded();
			}
		};

		abstract Object getData (Random random);

		public List buildData (Random random, int numClasses) {
			return IntStream.rangeClosed(0, numClasses).mapToObj(i -> getData(random))
				.collect(Collectors.toList());
		}
	}

	private static MapAdapter createMap(MapType mapType, int initialCapacity, float loadFactor, int maxCapacity) {
		switch (mapType) {
		case cuckoo:
			return new CuckooMapAdapter<>(new CuckooObjectMap<>(initialCapacity, loadFactor), maxCapacity);
		case object:
			return new ObjectMapAdapter<>(new ObjectMap<>(initialCapacity, loadFactor), maxCapacity);
		case identity:
			return new ObjectMapAdapter<>(new IdentityMap<>(initialCapacity, loadFactor), maxCapacity);
		case hash:
			return new HashMapAdapter<>(new HashMap<>(initialCapacity, loadFactor));
		default:
			throw new IllegalStateException("Unexpected value: " + mapType);
		}
	}

	interface MapAdapter {
		V get (K key);

		V put (K key, V value);

		void clear ();
	}

	static class ObjectMapAdapter implements MapAdapter {
		private final ObjectMap delegate;
		private final int maxCapacity;

		public ObjectMapAdapter (ObjectMap delegate, int maxCapacity) {
			this.delegate = delegate;
			this.maxCapacity = maxCapacity;
		}

		@Override
		public Integer get (K key) {
			return delegate.get(key, -1);
		}

		@Override
		public Integer put (K key, Integer value) {
			delegate.put(key, value);
			return null;
		}

		@Override
		public void clear () {
			delegate.clear(maxCapacity);
		}
	}

	static class CuckooMapAdapter implements MapAdapter {
		private final CuckooObjectMap delegate;
		private final int maxCapacity;

		public CuckooMapAdapter (CuckooObjectMap delegate, int maxCapacity) {
			this.delegate = delegate;
			this.maxCapacity = maxCapacity;
		}

		@Override
		public Integer get (K key) {
			return delegate.get(key, -1);
		}

		@Override
		public Integer put (K key, Integer value) {
			delegate.put(key, value);
			return null;
		}

		@Override
		public void clear () {
			delegate.clear(maxCapacity);
		}
	}

	private static class HashMapAdapter implements MapAdapter {
		private final HashMap delegate;

		public HashMapAdapter (HashMap delegate) {
			this.delegate = delegate;
		}

		@Override
		public Integer get (K key) {
			return delegate.get(key);
		}

		@Override
		public Integer put (K key, Integer value) {
			return delegate.put(key, value);
		}

		@Override
		public void clear () {
			delegate.clear();
		}
	}

}
 















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