package org.apache.directmemory.memory;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
 */

import com.carrotsearch.junitbenchmarks.AbstractBenchmark;
import com.carrotsearch.junitbenchmarks.BenchmarkOptions;
import com.carrotsearch.junitbenchmarks.annotation.AxisRange;
import com.carrotsearch.junitbenchmarks.annotation.BenchmarkHistoryChart;
import com.carrotsearch.junitbenchmarks.annotation.BenchmarkMethodChart;
import com.carrotsearch.junitbenchmarks.annotation.LabelType;
import com.google.common.collect.MapMaker;
import org.apache.directmemory.measures.Ram;
import org.apache.directmemory.memory.Pointer;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Random;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicInteger;

@AxisRange( min = 0, max = 1 )
@BenchmarkMethodChart()
@BenchmarkHistoryChart( labelWith = LabelType.CUSTOM_KEY, maxRuns = 5 )

@Ignore
public class ConcurrentTest
    extends AbstractBenchmark
{

    private final static int entries = 100000;

    public static AtomicInteger count = new AtomicInteger();

    private static AtomicInteger got = new AtomicInteger();

    private static AtomicInteger missed = new AtomicInteger();

    private static AtomicInteger good = new AtomicInteger();

    private static AtomicInteger bad = new AtomicInteger();

    private static AtomicInteger read = new AtomicInteger();

    private static MemoryManagerService<Object> mem;

    public static ConcurrentMap<String, Pointer<Object>> map =
        new MapMaker().concurrencyLevel( 4 ).initialCapacity( 100000 ).makeMap();

    @Before
    public void initMMS()
    {
        mem = new MemoryManagerServiceImpl<Object>();
        mem.init( 1, 512 * 1024 * 1024 );
    }
    
    @BenchmarkOptions( benchmarkRounds = 100000, warmupRounds = 0, concurrency = 100 )
    @Test
    public void store()
    {
        final String key = "test-" + count.incrementAndGet();
        map.put( key, mem.store( key.getBytes() ) );
    }

    @BenchmarkOptions( benchmarkRounds = 1000000, warmupRounds = 0, concurrency = 100 )
    @Test
    public void retrieveCatchThemAll()
    {
        String key = "test-" + ( rndGen.nextInt( entries ) + 1 );
        Pointer<Object> p = map.get( key );
        read.incrementAndGet();
        if ( p != null )
        {
            got.incrementAndGet();
            byte[] payload = mem.retrieve( p );
            if ( key.equals( new String( payload ) ) )
            {
                good.incrementAndGet();
            }
            else
            {
                bad.incrementAndGet();
            }
        }
        else
        {
            logger.info( "did not find key " + key );
            missed.incrementAndGet();
        }
    }

    @BenchmarkOptions( benchmarkRounds = 1000000, warmupRounds = 0, concurrency = 100 )
    @Test
    public void retrieveCatchHalfOfThem()
    {
        String key = "test-" + ( rndGen.nextInt( entries * 2 ) + 1 );
        Pointer<Object> p = map.get( key );
        read.incrementAndGet();
        if ( p != null )
        {
            got.incrementAndGet();
            byte[] payload = mem.retrieve( p );
            if ( key.equals( new String( payload ) ) )
            {
                good.incrementAndGet();
            }
            else
            {
                bad.incrementAndGet();
            }
        }
        else
        {
            missed.incrementAndGet();
        }
    }

    private void put( String key )
    {
        map.put( key, mem.store( key.getBytes() ) );
    }

    @BenchmarkOptions( benchmarkRounds = 1000000, warmupRounds = 0, concurrency = 10 )
    @Test
    public void write3Read7()
    {
        String key = "test-" + ( rndGen.nextInt( entries * 2 ) + 1 );

        int what = rndGen.nextInt( 10 );

        switch ( what )
        {
            case 0:
            case 1:
            case 2:
                put( key );
                break;
            default:
                get( key );
                break;

        }

    }

    @BenchmarkOptions( benchmarkRounds = 1000000, warmupRounds = 0, concurrency = 10 )
    @Test
    public void write1Read9()
    {
        String key = "test-" + ( rndGen.nextInt( entries * 2 ) + 1 );

        int what = rndGen.nextInt( 10 );

        switch ( what )
        {
            case 0:
                put( key );
                break;
            default:
                get( key );
                break;

        }

    }

    private void get( String key )
    {
        Pointer<Object> p = map.get( key );
        read.incrementAndGet();
        if ( p != null )
        {
            got.incrementAndGet();
            byte[] payload = mem.retrieve( p );
            if ( key.equals( new String( payload ) ) )
            {
                good.incrementAndGet();
            }
            else
            {
                bad.incrementAndGet();
            }
        }
        else
        {
            missed.incrementAndGet();
        }
    }

    Random rndGen = new Random();

    private static Logger logger = LoggerFactory.getLogger( ConcurrentTest.class );

    @BeforeClass
    @AfterClass
    public static void dump()
    {
        logger.info( "off-heap allocated: " + Ram.inMb( mem.capacity() ) );
        logger.info( "off-heap used:      " + Ram.inMb( mem.used() ) );
        logger.info( "heap - max: " + Ram.inMb( Runtime.getRuntime().maxMemory() ) );
        logger.info( "heap - allocated: " + Ram.inMb( Runtime.getRuntime().totalMemory() ) );
        logger.info( "heap - free : " + Ram.inMb( Runtime.getRuntime().freeMemory() ) );
        logger.info( "************************************************" );
        logger.info( "entries: " + entries );
        logger.info( "inserted: " + map.size() );
        logger.info( "reads: " + read );
        logger.info( "count: " + count );
        logger.info( "got: " + got );
        logger.info( "missed: " + missed );
        logger.info( "good: " + good );
        logger.info( "bad: " + bad );
        logger.info( "************************************************" );
    }

}