All Downloads are FREE. Search and download functionalities are using the official Maven repository.

net.openhft.hashing.UnsafeAccess Maven / Gradle / Ivy

Go to download

Zero-allocation implementations of fast non-cryptographic hash functions for byte sequences or blocks of memory

There is a newer version: 0.27ea0
Show newest version
/*
 * Copyright 2014 Higher Frequency Trading http://www.higherfrequencytrading.com
 *
 * Licensed 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 net.openhft.hashing;

import sun.misc.Unsafe;

import java.lang.reflect.Field;
import java.nio.ByteOrder;

import static net.openhft.hashing.Primitives.*;

final class UnsafeAccess extends Access {
    public static final UnsafeAccess INSTANCE = new UnsafeAccess();

    static final Unsafe UNSAFE;
    static final long BOOLEAN_BASE;
    static final long BYTE_BASE;
    static final long CHAR_BASE;
    static final long SHORT_BASE;
    static final long INT_BASE;
    static final long LONG_BASE;

    static {
        try {
            Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
            theUnsafe.setAccessible(true);
            UNSAFE = (Unsafe) theUnsafe.get(null);
            BOOLEAN_BASE = UNSAFE.arrayBaseOffset(boolean[].class);
            BYTE_BASE = UNSAFE.arrayBaseOffset(byte[].class);
            CHAR_BASE = UNSAFE.arrayBaseOffset(char[].class);
            SHORT_BASE = UNSAFE.arrayBaseOffset(short[].class);
            INT_BASE = UNSAFE.arrayBaseOffset(int[].class);
            LONG_BASE = UNSAFE.arrayBaseOffset(long[].class);
        } catch (Exception e) {
            throw new AssertionError(e);
        }
    }

    private UnsafeAccess() {}

    @Override
    public long getLong(Object input, long offset) {
        return UNSAFE.getLong(input, offset);
    }

    @Override
    public long getUnsignedInt(Object input, long offset) {
        return unsignedInt(getInt(input, offset));
    }

    @Override
    public int getInt(Object input, long offset) {
        return UNSAFE.getInt(input, offset);
    }

    @Override
    public int getUnsignedShort(Object input, long offset) {
        return unsignedShort(getShort(input, offset));
    }

    @Override
    public int getShort(Object input, long offset) {
        return UNSAFE.getShort(input, offset);
    }

    @Override
    public int getUnsignedByte(Object input, long offset) {
        return unsignedByte(getByte(input, offset));
    }

    @Override
    public int getByte(Object input, long offset) {
        return UNSAFE.getByte(input, offset);
    }

    @Override
    public ByteOrder byteOrder(Object input) {
        return ByteOrder.nativeOrder();
    }

}
    

    

    

            

    

            



    
    






    
© 2015 - 2024 Weber Informatics LLC | Privacy Policy