DirectByteBufferFactory.java

package com.jivesoftware.os.amza.service.filer;

import java.io.IOException;
import java.nio.ByteBuffer;

/**
 *
 */
public class DirectByteBufferFactory implements ByteBufferFactory {

    @Override
    public ByteBuffer allocate(int index, long _size) {
        return ByteBuffer.allocateDirect((int) _size);
    }

    @Override
    public ByteBuffer reallocate(int index, ByteBuffer oldBuffer, long newSize) {
        ByteBuffer newBuffer = allocate(index, newSize);
        if (oldBuffer != null) {
            oldBuffer.position(0);
            newBuffer.put(oldBuffer); // this assume we only grow. Blame Kevin :)
            newBuffer.position(0);
        }
        return newBuffer;
    }

    @Override
    public long length() {
        return 0;
    }

    @Override
    public long nextLength(int index, long oldLength, long position) {
        long newSize = oldLength * 2;
        while (newSize < position) {
            newSize *= 2;
        }
        return newSize;
    }

    @Override
    public void close(ByteBufferBackedFiler[] filers) throws IOException {
        for (ByteBufferBackedFiler filer : filers) {
            filer.close();
        }
    }
}