change the way messages are received

Messages used to be "delivered" and pushed right onto the queue, which
is where the requirement for Message to be explicitly shared came from.
Now messages that are incomplete come in and are stored in a "currentMessage"
private member (there is a requirement that messages are delivered in this
fashion, by the spec). Once the message body has come in, it is put into
the local queue and the messageReceived signal is emitted.

Also, modified Queue to be able to track a number of consumer tags. This
was exposed by the "routing" tutorial, where a single consumer can bind
to a number of exchanges with a generated consumer tag. The previous example
did not run into this problem because it used an explicitly set consumer tag
and therefore there were no conflicts.

src/amqp_queue.cpp

@@ -75,22 +75,20 @@ bool QueuePrivate::_q_method(const Frame::Method &frame)
 
 void QueuePrivate::_q_content(const Frame::Content &frame)
 {
-    Q_Q(Queue);
     Q_ASSERT(frame.channel() == channelNumber);
     if (frame.channel() != channelNumber)
         return;
 
-    if (q->isEmpty()) {
-        qErrnoWarning("Received content-header without method frame before");
+    if (!currentMessage.isValid()) {
+        qAmqpDebug() << "received content-header without delivered message";
         return;
     }
 
-    Message message = q->last();
-    message.d->leftSize = frame.bodySize();
+    currentMessage.d->leftSize = frame.bodySize();
     QHash<int, QVariant>::ConstIterator it;
     QHash<int, QVariant>::ConstIterator itEnd = frame.properties_.constEnd();
     for (it = frame.properties_.constBegin(); it != itEnd; ++it)
-        message.d->properties[MessageProperty(it.key())] = it.value();
+        currentMessage.d->properties[MessageProperty(it.key())] = it.value();
 }
 
 void QueuePrivate::_q_body(const Frame::ContentBody &frame)
@@ -100,22 +98,23 @@ void QueuePrivate::_q_body(const Frame::ContentBody &frame)
     if (frame.channel() != channelNumber)
         return;
 
-    if (q->isEmpty()) {
-        qErrnoWarning("Received content-body without method frame before");
+    if (!currentMessage.isValid()) {
+        qAmqpDebug() << "received content-body without delivered message";
         return;
     }
 
-    Message message = q->last();
-    message.d->payload.append(frame.body());
-    message.d->leftSize -= frame.body().size();
-    if (message.d->leftSize == 0 && q->size() == 1)
+    currentMessage.d->payload.append(frame.body());
+    currentMessage.d->leftSize -= frame.body().size();
+    if (currentMessage.d->leftSize == 0) {
+        q->enqueue(currentMessage);
         Q_EMIT q->messageReceived();
+    }
 }
 
 void QueuePrivate::declareOk(const Frame::Method &frame)
 {
     Q_Q(Queue);
-    qAmqpDebug() << "Declared queue: " << name;
+    qAmqpDebug() << "declared queue: " << name;
     declared = true;
 
     QByteArray data = frame.arguments();
@@ -124,7 +123,7 @@ void QueuePrivate::declareOk(const Frame::Method &frame)
     name = Frame::readField('s', stream).toString();
     qint32 messageCount = 0, consumerCount = 0;
     stream >> messageCount >> consumerCount;
-    qAmqpDebug("Message count %d\nConsumer count: %d", messageCount, consumerCount);
+    qAmqpDebug("message count %d\nConsumer count: %d", messageCount, consumerCount);
 
     Q_EMIT q->declared();
 }
@@ -172,13 +171,12 @@ void QueuePrivate::unbindOk(const Frame::Method &frame)
     Q_UNUSED(frame)
 
     Q_Q(Queue);
-    qAmqpDebug() << Q_FUNC_INFO << "unbound exchange";
+    qAmqpDebug() << Q_FUNC_INFO << "unbound from exchange";
     Q_EMIT q->unbound();
 }
 
 void QueuePrivate::getOk(const Frame::Method &frame)
 {
-    Q_Q(Queue);
     QByteArray data = frame.arguments();
     QDataStream in(&data, QIODevice::ReadOnly);
 
@@ -187,27 +185,27 @@ void QueuePrivate::getOk(const Frame::Method &frame)
     message.d->redelivered = Frame::readField('t',in).toBool();
     message.d->exchangeName = Frame::readField('s',in).toString();
     message.d->routingKey = Frame::readField('s',in).toString();
-    q->enqueue(message);
+    currentMessage = message;
 }
 
 void QueuePrivate::consumeOk(const Frame::Method &frame)
 {
-    qAmqpDebug() << "Consume ok: " << name;
+    qAmqpDebug() << "consume ok: " << name;
     QByteArray data = frame.arguments();
     QDataStream stream(&data, QIODevice::ReadOnly);
-    consumerTag = Frame::readField('s',stream).toString();
-    qAmqpDebug("Consumer tag = %s", qPrintable(consumerTag));
+    QString consumerTag = Frame::readField('s',stream).toString();
+    qAmqpDebug("consumer tag = %s", qPrintable(consumerTag));
+    consumerTags.append(consumerTag);
 }
 
 void QueuePrivate::deliver(const Frame::Method &frame)
 {
-    Q_Q(Queue);
     qAmqpDebug() << Q_FUNC_INFO;
     QByteArray data = frame.arguments();
     QDataStream in(&data, QIODevice::ReadOnly);
-    QString consumer_ = Frame::readField('s',in).toString();
-    if (consumer_ != consumerTag) {
-        qAmqpDebug() << Q_FUNC_INFO << "invalid consumer tag: " << consumer_;
+    QString consumer = Frame::readField('s',in).toString();
+    if (!consumerTags.contains(consumer)) {
+        qAmqpDebug() << Q_FUNC_INFO << "invalid consumer tag: " << consumer;
         return;
     }
 
@@ -216,7 +214,7 @@ void QueuePrivate::deliver(const Frame::Method &frame)
     message.d->redelivered = Frame::readField('t',in).toBool();
     message.d->exchangeName = Frame::readField('s',in).toString();
     message.d->routingKey = Frame::readField('s',in).toString();
-    q->enqueue(message);
+    currentMessage = message;
 }
 
 void QueuePrivate::declare()
@@ -429,7 +427,7 @@ void Queue::consume(int options)
 
     out << qint16(0);   //reserved 1
     Frame::writeField('s', out, d->name);
-    Frame::writeField('s', out, d->consumerTag);
+    Frame::writeField('s', out, d->explicitConsumerTag);
 
     out << qint8(options);
     Frame::writeField('F', out, Frame::TableField());
@@ -441,13 +439,13 @@ void Queue::consume(int options)
 void Queue::setConsumerTag(const QString &consumerTag)
 {
     Q_D(Queue);
-    d->consumerTag = consumerTag;
+    d->explicitConsumerTag = consumerTag;
 }
 
 QString Queue::consumerTag() const
 {
     Q_D(const Queue);
-    return d->consumerTag;
+    return d->explicitConsumerTag;
 }
 
 void Queue::get()

src/amqp_queue_p.h

@@ -2,6 +2,8 @@
 #define amqp_queue_p_h__
 
 #include <QQueue>
+#include <QStringList>
+
 #include "amqp_channel_p.h"
 
 namespace QAMQP
@@ -43,9 +45,11 @@ public:
     bool delayedDeclare;
     bool declared;
     bool noAck;
-    QString consumerTag;
+    QString explicitConsumerTag;
+    QStringList consumerTags;
     QQueue<QPair<QString, QString> > delayedBindings;
     bool recievingMessage;
+    Message currentMessage;
 
     Q_DECLARE_PUBLIC(Queue)