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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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 *

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package org.openjdk.micro.jdk.java.util.zip;

import java.nio.ByteBuffer;

import java.util.Random;

import java.util.concurrent.TimeUnit;

import java.util.zip.Checksum;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.OperationsPerInvocation;

import org.openjdk.jmh.annotations.OutputTimeUnit;

import org.openjdk.jmh.annotations.Param;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.Setup;

import org.openjdk.jmh.annotations.State;

/**

 *

 * Base class for benchmarking JDK supported Checksums with unaligned memory

 * accesses.

 *

 * To use the base class extend it and use a setup method configure the checksum

 * field.

 *

 */

@State(Scope.Thread)

@OutputTimeUnit(TimeUnit.MILLISECONDS)

public abstract class ChecksumUnalignedBenchmarks {

    private final byte[] unalignedByteArray_1k = new byte[1034];

    private final ByteBuffer unalignedWrappedByteBuffer_1k = ByteBuffer.wrap(unalignedByteArray_1k);

    private final ByteBuffer unalignedDirectByteBuffer_1k = ByteBuffer.allocateDirect(unalignedByteArray_1k.length);

    @Setup

    final public void setup() {

        Random r = new Random(123456789L);

        r.nextBytes(unalignedByteArray_1k);

        unalignedDirectByteBuffer_1k.put(unalignedByteArray_1k);

    }

    protected Checksum checksum;

    @Param({"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"})

    private int offset;

    @Benchmark

    @OperationsPerInvocation(1024)

    public void byteArray_1K() {

        checksum.update(unalignedByteArray_1k, offset, 1024);

    }

    @Benchmark

    @OperationsPerInvocation(1024)

    public void wrappedByteBuffer_1K() {

        unalignedWrappedByteBuffer_1k.position(offset);

        unalignedWrappedByteBuffer_1k.limit(offset + 1024);

        checksum.update(unalignedWrappedByteBuffer_1k);

    }

    @Benchmark

    @OperationsPerInvocation(1024)

    public void directByteBuffer_1K() {

        unalignedDirectByteBuffer_1k.position(offset);

        unalignedWrappedByteBuffer_1k.limit(offset + 1024);

        checksum.update(unalignedDirectByteBuffer_1k);

    }

}