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A fast java serialization drop in-replacement and some serialization based utils such as Structs and OffHeap Memory.
There is a newer version: 3.0.4-jdk17
/*
 * Copyright 2014 Ruediger Moeller.
 *
 * 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 org.nustaq.offheap.bytez.malloc;

import org.nustaq.offheap.bytez.BasicBytez;
import org.nustaq.offheap.bytez.Bytez;
import org.nustaq.offheap.bytez.onheap.HeapBytez;
import org.nustaq.serialization.util.FSTUtil;
import sun.misc.Unsafe;

/**
 * Date: 17.11.13
 * Time: 00:01
 *
 * implementation of Bytez interface using unsafe on raw allocated memory
 *
 */
public class MallocBytez implements Bytez {

    static Unsafe unsafe = FSTUtil.getUnsafe();
    static long byteoff = FSTUtil.bufoff;
    static long caoff = FSTUtil.choff;
    static long saoff = FSTUtil.choff;
    static long iaoff = FSTUtil.intoff;
    static long laoff = FSTUtil.longoff;
    static long daoff = FSTUtil.doubleoff;
    static long faoff = FSTUtil.floatoff;


    protected long baseAdress;
    protected long length;
    public MallocBytez(long adr, long len) {
        setBase(adr, len);
    }

    public void setBase(long adr, long len) {
        baseAdress = adr;
        length = len;
    }

    public MallocBytez slice(long off, int len) {
        if (off+len >= length)
            throw new RuntimeException("invalid slice "+off+":"+len+" mylen:"+length);
        return new MallocBytez(baseAdress+off,len);
    }

    @Override
    public byte get(long byteIndex) {
        return unsafe.getByte(baseAdress +byteIndex);
    }

    @Override
    public boolean getBool(long byteIndex) {
        return unsafe.getByte(baseAdress +byteIndex) != 0;
    }

    @Override
    public char getChar(long byteIndex) {
        return unsafe.getChar(baseAdress + byteIndex);
    }

    @Override
    public short getShort(long byteIndex) {
        return unsafe.getShort(baseAdress + byteIndex);
    }

    @Override
    public int getInt(long byteIndex) {
        int res = unsafe.getInt(baseAdress + byteIndex);
        return res;
    }

    @Override
    public long getLong(long byteIndex) {
        return unsafe.getLong(baseAdress + byteIndex);
    }

    @Override
    public float getFloat(long byteIndex) {
        return unsafe.getFloat(baseAdress + byteIndex);
    }

    @Override
    public double getDouble(long byteIndex) {
        return unsafe.getDouble(baseAdress + byteIndex);
    }

    @Override
    public void put(long byteIndex, byte value) {
        unsafe.putByte(baseAdress + byteIndex, value);
    }

    @Override
    public void putBool(long byteIndex, boolean val) {
        put(byteIndex, (byte) (val ? 1 : 0));
    }

    @Override
    public void putChar(long byteIndex, char c) {
        unsafe.putChar(baseAdress + byteIndex, c);
    }

    @Override
    public void putShort(long byteIndex, short s) {
        unsafe.putShort(baseAdress + byteIndex, s);
    }

    @Override
    public void putInt(long byteIndex, int i) {
        unsafe.putInt(baseAdress + byteIndex, i);
    }

    @Override
    public void putLong(long byteIndex, long l) {
        unsafe.putLong(baseAdress + byteIndex, l);
    }

    @Override
    public void putFloat(long byteIndex, float f) {
        unsafe.putFloat(baseAdress + byteIndex, f);
    }

    @Override
    public void putDouble(long byteIndex, double d) {
        unsafe.putDouble( baseAdress + byteIndex, d);
    }

    @Override
    public long length() {
        return length;
    }

    @Override
    public void getArr(long byteIndex, byte[] target, int elemoff, int numElems) {
        unsafe.copyMemory(null,baseAdress+byteIndex,target, byteoff+elemoff,numElems);
    }

    @Override
    public void getCharArr(long byteIndex, char[] target, int elemoff, int numElems) {
        unsafe.copyMemory(null,baseAdress +byteIndex,target,caoff+elemoff*2,numElems*2);
    }

    @Override
    public void getShortArr(long byteIndex, short[] target, int elemoff, int numElems) {
        unsafe.copyMemory(null,baseAdress +byteIndex,target,saoff+elemoff*2,numElems*2);
    }

    @Override
    public void getIntArr(long byteIndex, int[] target, int elemoff, int numElems) {
        unsafe.copyMemory(null,baseAdress +byteIndex,target,iaoff+elemoff*4,numElems*4);
    }

    @Override
    public void getLongArr(long byteIndex, long[] target, int elemoff, int numElems) {
        unsafe.copyMemory(null, baseAdress +byteIndex,target,laoff+elemoff*8,numElems*8);
    }

    @Override
    public void getFloatArr(long byteIndex, float[] target, int elemoff, int numElems) {
        unsafe.copyMemory(null, baseAdress +byteIndex,target,faoff+elemoff*4,numElems*4);
    }

    @Override
    public void getDoubleArr(long byteIndex, double[] target, int elemoff, int numElems) {
        unsafe.copyMemory(null, baseAdress +byteIndex,target,daoff+elemoff*8,numElems*8);
    }

    @Override
    public void getBooleanArr(long byteIndex, boolean[] target, int elemoff, int numElems) {
        for ( int i = 0; i < numElems; i++) {
            target[elemoff+i] = getBool(byteIndex+i);
        }
    }

    @Override
    public void set(long byteIndex, byte[] source, int elemoff, int numElems) {
        unsafe.copyMemory(source, byteoff+elemoff,null, baseAdress +byteIndex,numElems);
    }

    @Override
    public void setChar(long byteIndex, char[] source, int elemoff, int numElems) {
        unsafe.copyMemory(source,caoff+elemoff*2, null, baseAdress +byteIndex,numElems*2);
    }

    @Override
    public void setShort(long byteIndex, short[] source, int elemoff, int numElems) {
        unsafe.copyMemory(source,caoff+elemoff*2, null, baseAdress +byteIndex,numElems*2);
    }

    @Override
    public void setInt(long byteIndex, int[] source, int elemoff, int numElems) {
        unsafe.copyMemory(source,iaoff+elemoff*4,null, baseAdress +byteIndex,numElems*4);
    }

    @Override
    public void setLong(long byteIndex, long[] source, int elemoff, int numElems) {
        unsafe.copyMemory(source,laoff+ elemoff*8, null, baseAdress +byteIndex,numElems*8);
    }

    @Override
    public void setFloat(long byteIndex, float[] source, int elemoff, int numElems) {
        unsafe.copyMemory(source,faoff+elemoff*4, null, baseAdress +byteIndex,numElems*4);
    }

    @Override
    public void setDouble(long byteIndex, double[] source, int elemoff, int numElems) {
        unsafe.copyMemory(source,daoff+elemoff*8,null, baseAdress +byteIndex,numElems*8);
    }

    @Override
    public void setBoolean(long byteIndex, boolean[] o, int elemoff, int numElems) {
        for ( int i = 0; i < numElems; i++) {
            put(byteIndex+i, (byte) (o[i+elemoff] ? 1 : 0));
        }
    }

    @Override
    public void copyTo(BasicBytez other, long otherByteIndex, long myByteIndex, long lenBytes) {
        if ( other instanceof HeapBytez) {
            HeapBytez hp = (HeapBytez) other;
            unsafe.copyMemory(null,baseAdress+myByteIndex, hp.getBase(), hp.getOff()+otherByteIndex,lenBytes);
        } else {
            for ( long i = 0; i < lenBytes; i++ ) {
                other.put(otherByteIndex+i,get(myByteIndex+i));
            }
        }
    }

    @Override
    public BasicBytez newInstance(long size) {
        return new MallocBytez(unsafe.allocateMemory(size),size);
    }

    @Override
    public boolean compareAndSwapInt(long offset, int expect, int newVal) {
        return unsafe.compareAndSwapInt(null, baseAdress + offset, expect, newVal);
    }

    @Override
    public boolean compareAndSwapLong(long offset, long expect, long newVal) {
        return unsafe.compareAndSwapLong(null, baseAdress + offset, expect, newVal);
    }

    @Override
    public byte[] toBytes(long startIndex, int len) {
        byte res[] = new byte[len];
        unsafe.copyMemory(null,baseAdress+startIndex, res, FSTUtil.bufoff, len );
        return res;
    }

    @Override
    public byte[] asByteArray() {
        throw new RuntimeException("malloc bytez do not support this");
    }

    /**
     * @return the start index inside the byte array returned by asByteArray, not supported by MallocBytez
     */
    @Override
    public int getBAOffsetIndex() {
        throw new RuntimeException("malloc bytez do not support this");
    }

    /**
     * @return the length inside the byte array returned by asByteArray, not supported by MallocBytez
     */
    @Override
    public int getBALength() {
        throw new RuntimeException("malloc bytez do not support this");
    }

    @Override
    public int hashCode() {
        return (int) (baseAdress ^ (baseAdress >>> 32));
    }

    @Override
    public boolean equals(Object obj) {
        if ( obj instanceof MallocBytez)
            return baseAdress == ((MallocBytez) obj).baseAdress && length == ((MallocBytez) obj).length;
        return false;
    }

    void free() {
        unsafe.freeMemory(baseAdress);
        MallocBytezAllocator.alloced.addAndGet(-length);
    }

    public long getBaseAdress() {
        return baseAdress;
    }

    public long getLength() {
        return length;
    }

    public void clear() {
        unsafe.setMemory(baseAdress,length, (byte) 0);
    }
}