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Java library for Azure Service Bus
There is a newer version: 3.6.7
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

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:{}, remoteSource:{}, 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);
        }
    }
}