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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
package com.microsoft.azure.eventhubs.impl;
import org.apache.qpid.proton.amqp.transport.ErrorCondition;
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;
import java.util.Locale;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import com.microsoft.azure.eventhubs.EventHubException;
public final class ReceiveLinkHandler extends BaseLinkHandler {
private static final Logger TRACE_LOGGER = LoggerFactory.getLogger(ReceiveLinkHandler.class);
private final AmqpReceiver amqpReceiver;
private final String receiverName;
private final ScheduledExecutorService executor;
private final Object firstResponse;
private boolean isFirstResponse;
public ReceiveLinkHandler(final AmqpReceiver receiver, final String receiverName, final ScheduledExecutorService executor) {
super(receiver, receiverName);
this.amqpReceiver = receiver;
this.receiverName = receiverName;
this.executor = executor;
this.firstResponse = new Object();
this.isFirstResponse = true;
}
@Override
public void onLinkLocalOpen(Event evt) {
Link link = evt.getLink();
if (link instanceof Receiver) {
if (TRACE_LOGGER.isInfoEnabled()) {
TRACE_LOGGER.info(String.format(Locale.US, "onLinkLocalOpen receiverName[%s], linkName[%s], localSource[%s]",
this.receiverName, link.getName(), link.getSource()));
}
}
}
@Override
public void onLinkRemoteOpen(Event event) {
Link link = event.getLink();
if (link instanceof Receiver) {
if (link.getRemoteSource() != null) {
if (TRACE_LOGGER.isInfoEnabled()) {
TRACE_LOGGER.info(String.format(Locale.US, "onLinkRemoteOpen receiverName[%s], linkName[%s], remoteSource[%s]",
this.receiverName, link.getName(), link.getRemoteSource()));
}
synchronized (this.firstResponse) {
this.isFirstResponse = false;
this.amqpReceiver.onOpenComplete(null);
}
} else {
if (TRACE_LOGGER.isInfoEnabled()) {
TRACE_LOGGER.info(String.format(Locale.US, "onLinkRemoteOpen receiverName[%s], linkName[%s], action[waitingForError]",
this.receiverName, link.getName()));
}
}
}
}
@Override
public void onLinkFinal(Event event) {
if (this.isFirstResponse) {
final Link link = event.getLink();
if (TRACE_LOGGER.isWarnEnabled()) {
TRACE_LOGGER.warn(String.format(Locale.US, "onLinkFinal receiverName[%s], linkName[%s] - link never opened",
this.receiverName, link.getName()));
}
final ErrorCondition condition = link.getCondition();
final Exception finalOpenError = (condition != null) ? ExceptionUtil.toException(condition) :
new EventHubException(true, "Link open failed, cause not available");
this.executor.schedule(new Runnable() {
@Override
public void run() {
ReceiveLinkHandler.this.amqpReceiver.onOpenComplete(finalOpenError);
}
}, AmqpConstants.LINK_ERROR_DELAY_MILLIS, TimeUnit.MILLISECONDS);
}
}
@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();
// 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()) {
// One of our customers hit an issue - where duplicate 'Delivery' events are raised to Reactor in proton-j layer
// While processing the duplicate event - reactor hits an IllegalStateException in proton-j layer
// before we fix proton-j - this work around ensures that we ignore the duplicate Delivery event
if (delivery.isSettled()) {
if (TRACE_LOGGER.isWarnEnabled()) {
TRACE_LOGGER.warn(
receiveLink != null
? String.format(Locale.US, "onDelivery receiverName[%s], linkName[%s], updatedLinkCredit[%s], remoteCredit[%s], "
+ "remoteCondition[%s], delivery.isSettled[%s]",
this.receiverName, receiveLink.getName(), receiveLink.getCredit(), receiveLink.getRemoteCredit(), receiveLink.getRemoteCondition(), delivery.isSettled())
: String.format(Locale.US, "delivery.isSettled[%s]", delivery.isSettled()));
}
} else {
this.amqpReceiver.onReceiveComplete(delivery);
}
}
if (TRACE_LOGGER.isTraceEnabled() && receiveLink != null) {
TRACE_LOGGER.trace(
String.format(Locale.US, "onDelivery receiverName[%s], linkName[%s], updatedLinkCredit[%s], remoteCredit[%s], "
+ "remoteCondition[%s], delivery.isPartial[%s]",
this.receiverName, receiveLink.getName(), receiveLink.getCredit(), receiveLink.getRemoteCredit(), receiveLink.getRemoteCondition(), delivery.isPartial()));
}
}
}
