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QuestDB is High Performance Time Series Database

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 * Copyright (C) 2014-2016 Appsicle
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 * as published by the Free Software Foundation.
 *
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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 java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.WritableByteChannel;

public abstract class AbstractObjectProducer implements ChannelProducer {

    private ByteBuffer buffer;

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

    @Override
    public final boolean hasContent() {
        return buffer != null && buffer.hasRemaining();
    }

    @Override
    public final void write(WritableByteChannel channel) throws JournalNetworkException {
        ByteBuffers.copy(buffer, channel);
    }

    public void setValue(T value) {
        if (value != null) {
            int sz = getBufferSize(value);
            int bufSz = sz + 4;
            if (buffer == null || buffer.capacity() < bufSz) {
                ByteBuffers.release(buffer);
                buffer = ByteBuffer.allocateDirect(bufSz).order(ByteOrder.LITTLE_ENDIAN);
            }
            buffer.limit(bufSz);
            buffer.rewind();
            buffer.putInt(sz);
            write(value, buffer);
            buffer.flip();
        }
    }

    public final void write(WritableByteChannel channel, T value) throws JournalNetworkException {
        setValue(value);
        write(channel);
    }

    abstract protected int getBufferSize(T value);

    abstract protected void write(T value, ByteBuffer buffer);
}