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QuestDB is High Performance Time Series Database

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 * Copyright (C) 2014-2016 Appsicle
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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package com.questdb.net.ha;

import com.questdb.ex.JournalNetworkException;
import com.questdb.misc.ByteBuffers;
import com.questdb.misc.Unsafe;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.ReadableByteChannel;

public abstract class AbstractObjectConsumer extends AbstractChannelConsumer {

    private final ByteBuffer header = ByteBuffer.allocateDirect(4).order(ByteOrder.LITTLE_ENDIAN);
    private final long headerAddress = ByteBuffers.getAddress(header);
    private ByteBuffer valueBuffer;

    @Override
    public void free() {
        valueBuffer = ByteBuffers.release(valueBuffer);
        ByteBuffers.release(header);
    }

    @Override
    protected final void doRead(ReadableByteChannel channel) throws JournalNetworkException {
        header.position(0);
        ByteBuffers.copy(channel, header);

        int bufSz = Unsafe.getUnsafe().getInt(headerAddress);
        if (valueBuffer == null || valueBuffer.capacity() < bufSz) {
            ByteBuffers.release(valueBuffer);
            valueBuffer = ByteBuffer.allocateDirect(bufSz).order(ByteOrder.LITTLE_ENDIAN);
        } else {
            valueBuffer.rewind();
        }
        valueBuffer.limit(bufSz);
        ByteBuffers.copy(channel, valueBuffer, bufSz);
    }

    final protected ByteBuffer getValueBuffer() {
        return valueBuffer;
    }
}