package org.apache.qpid.server.handler;

import org.apache.log4j.Logger;

import org.apache.qpid.framing.BasicRecoverBody;
import org.apache.qpid.framing.ProtocolVersion;
import org.apache.qpid.framing.AMQMethodBody;
import org.apache.qpid.framing.BasicRecoverSyncBody;
import org.apache.qpid.framing.amqp_0_9.MethodRegistry_0_9;
import org.apache.qpid.framing.amqp_8_0.MethodRegistry_8_0;
import org.apache.qpid.server.state.StateAwareMethodListener;
import org.apache.qpid.server.state.AMQStateManager;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.AMQChannel;
import org.apache.qpid.AMQException;

public class BasicRecoverSyncMethodHandler implements StateAwareMethodListener<BasicRecoverSyncBody>
{
    private static final Logger _logger = Logger.getLogger(BasicRecoverSyncMethodHandler.class);

    private static final BasicRecoverSyncMethodHandler _instance = new BasicRecoverSyncMethodHandler();

    public static BasicRecoverSyncMethodHandler getInstance()
    {
        return _instance;
    }

    public void methodReceived(AMQStateManager stateManager, BasicRecoverSyncBody body, int channelId) throws AMQException
    {
        AMQProtocolSession session = stateManager.getProtocolSession();

        _logger.debug("Recover received on protocol session " + session + " and channel " + channelId);
        AMQChannel channel = session.getChannel(channelId);


        if (channel == null)
        {
            throw body.getChannelNotFoundException(channelId);
        }

        channel.resend(body.getRequeue());

        // Qpid 0-8 hacks a synchronous -ok onto recover.
        // In Qpid 0-9 we create a separate sync-recover, sync-recover-ok pair to be "more" compliant
        if(session.getProtocolVersion().equals(ProtocolVersion.v0_9))
        {
            MethodRegistry_0_9 methodRegistry = (MethodRegistry_0_9) session.getMethodRegistry();
            AMQMethodBody recoverOk = methodRegistry.createBasicRecoverSyncOkBody();
            session.writeFrame(recoverOk.generateFrame(channelId));

        }

    }
}
