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Java library for Azure Service Bus. Please note, a newer package com.azure:azure-messaging-servicebus for Azure Service Bus is available as of December 2020. While this package will continue to receive critical bug fixes, we strongly encourage you to upgrade. Read the migration guide at https://aka.ms/azsdk/java/migrate/sb for more details.

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/*
 * Copyright (c) Microsoft. All rights reserved.
 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
 */
package com.microsoft.azure.servicebus.amqp;

import org.apache.qpid.proton.engine.Delivery;
import org.apache.qpid.proton.engine.Event;
import org.apache.qpid.proton.engine.Link;
import org.apache.qpid.proton.engine.Receiver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

// ServiceBus <-> ProtonReactor interaction 
// handles all recvLink - reactor events
public final class ReceiveLinkHandler extends BaseLinkHandler
{
    private static final Logger TRACE_LOGGER = LoggerFactory.getLogger(ReceiveLinkHandler.class);
    
	private final IAmqpReceiver amqpReceiver;
	private final Object firstResponse;
	private boolean isFirstResponse;

	public ReceiveLinkHandler(final IAmqpReceiver receiver)
	{
		super(receiver);

		this.amqpReceiver = receiver;
		this.firstResponse = new Object();
		this.isFirstResponse = true;
	}

	@Override
	public void onLinkLocalOpen(Event evt)
	{
		Link link = evt.getLink();
		if (link instanceof Receiver)
		{
			Receiver receiver = (Receiver) link;			
			TRACE_LOGGER.debug("onLinkLocalOpen: linkName:{}, localSource:{}", receiver.getName(), receiver.getSource());
		}
	}

	@Override
	public void onLinkRemoteOpen(Event event)
	{
		Link link = event.getLink();
		if (link != null && link instanceof Receiver)
		{
			Receiver receiver = (Receiver) link;
			if (link.getRemoteSource() != null)
			{				
				TRACE_LOGGER.debug("onLinkRemoteOpen: linkName:{}, remoteSource:{}", receiver.getName(), receiver.getRemoteSource());

				synchronized (this.firstResponse)
				{
					this.isFirstResponse = false;
					this.amqpReceiver.onOpenComplete(null);
				}
			}
			else
			{				
				TRACE_LOGGER.debug("onLinkRemoteOpen: linkName:{}, remoteTarget:{}, remoteTarget:{}, action:{}", receiver.getName(), null, null, "waitingForError");
			}
		}
	}

	@Override
	public void onDelivery(Event event)
	{
		synchronized (this.firstResponse)
		{
			if (this.isFirstResponse)
			{
				this.isFirstResponse = false;
				this.amqpReceiver.onOpenComplete(null);
			}
		}

		Delivery delivery = event.getDelivery();
		Receiver receiveLink = (Receiver) delivery.getLink();

		TRACE_LOGGER.debug("onDelivery: linkName:{}, updatedLinkCredit:{}, remoteCredit:{}, remoteCondition:{}, delivery.isPartial:{}", 
                receiveLink.getName(), receiveLink.getCredit(), receiveLink.getRemoteCredit(), receiveLink.getRemoteCondition(), delivery.isPartial());
		
		//TODO: What happens when a delivery has no message, but only disposition from the remote link? Like when ServiceBus service sends just a disposition to the receiver?"
		
		// If a message spans across deliveries (for ex: 200k message will be 4 frames (deliveries) 64k 64k 64k 8k), 
		// all until "last-1" deliveries will be partial
		// reactor will raise onDelivery event for all of these - we only need the last one
		if (!delivery.isPartial())
		{	
			this.amqpReceiver.onReceiveComplete(delivery);
		}
	}
}