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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/broker/amqp/Outgoing.h"
#include "qpid/broker/amqp/Header.h"
#include "qpid/broker/amqp/Translation.h"
#include "qpid/broker/Queue.h"
#include "qpid/broker/TopicKeyNode.h"
#include "qpid/sys/OutputControl.h"
#include "qpid/amqp/MessageEncoder.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace broker {
namespace amqp {
Outgoing::Outgoing(Broker& broker, boost::shared_ptr<Queue> q, pn_link_t* l, ManagedSession& session, qpid::sys::OutputControl& o, bool topic)
: Consumer(pn_link_name(l), /*FIXME*/CONSUMER),
ManagedOutgoingLink(broker, *q, session, pn_link_name(l), topic),
exclusive(topic),
queue(q), deliveries(5000), link(l), out(o),
current(0), outstanding(0),
buffer(1024)/*used only for header at present*/
{
for (size_t i = 0 ; i < deliveries.capacity(); ++i) {
deliveries[i].init(i);
}
}
void Outgoing::init()
{
queue->consume(shared_from_this(), exclusive);//may throw exception
}
bool Outgoing::dispatch()
{
QPID_LOG(trace, "Dispatching to " << getName() << ": " << pn_link_credit(link));
if (canDeliver()) {
if (queue->dispatch(shared_from_this())) {
return true;
} else {
pn_link_drained(link);
QPID_LOG(debug, "No message available on " << queue->getName());
}
} else {
QPID_LOG(debug, "Can't deliver to " << getName() << " from " << queue->getName() << ": " << pn_link_credit(link));
}
return false;
}
void Outgoing::write(const char* data, size_t size)
{
pn_link_send(link, data, size);
}
void Outgoing::handle(pn_delivery_t* delivery)
{
pn_delivery_tag_t tag = pn_delivery_tag(delivery);
size_t i = *reinterpret_cast<const size_t*>(tag.bytes);
Record& r = deliveries[i];
if (pn_delivery_writable(delivery)) {
assert(r.msg);
assert(!r.delivery);
r.delivery = delivery;
//write header
qpid::amqp::MessageEncoder encoder(&buffer[0], buffer.size());
encoder.writeHeader(Header(r.msg));
write(&buffer[0], encoder.getPosition());
Translation t(r.msg);
t.write(*this);
if (pn_link_advance(link)) {
--outstanding;
outgoingMessageSent();
QPID_LOG(debug, "Sent message " << r.msg.getSequence() << " from " << queue->getName() << ", index=" << r.index);
} else {
QPID_LOG(error, "Failed to send message " << r.msg.getSequence() << " from " << queue->getName() << ", index=" << r.index);
}
}
if (pn_delivery_updated(delivery)) {
assert(r.delivery == delivery);
r.disposition = pn_delivery_remote_state(delivery);
if (r.disposition) {
switch (r.disposition) {
case PN_ACCEPTED:
//TODO: only if consuming
queue->dequeue(0, r.cursor);
outgoingMessageAccepted();
break;
case PN_REJECTED:
queue->reject(r.cursor);
outgoingMessageRejected();
break;
case PN_RELEASED:
queue->release(r.cursor, false);//TODO: for PN_RELEASED, delivery count should not be incremented
outgoingMessageRejected();//TODO: not quite true...
break;
case PN_MODIFIED:
queue->release(r.cursor, true);//TODO: proper handling of modified
outgoingMessageRejected();//TODO: not quite true...
break;
default:
QPID_LOG(warning, "Unhandled disposition: " << r.disposition);
}
//TODO: ony settle once any dequeue on store has completed
pn_delivery_settle(delivery);
r.reset();
}
}
}
bool Outgoing::canDeliver()
{
return deliveries[current].delivery == 0 && pn_link_credit(link) > outstanding;
}
void Outgoing::detached()
{
QPID_LOG(debug, "Detaching outgoing link from " << queue->getName());
queue->cancel(shared_from_this());
//TODO: release in a clearer order?
for (size_t i = 0 ; i < deliveries.capacity(); ++i) {
if (deliveries[i].msg) queue->release(deliveries[i].cursor, true);
}
Queue::tryAutoDelete(*queue->getBroker(), queue, "", "");
}
//Consumer interface:
bool Outgoing::deliver(const QueueCursor& cursor, const qpid::broker::Message& msg)
{
Record& r = deliveries[current++];
if (current >= deliveries.capacity()) current = 0;
r.cursor = cursor;
r.msg = msg;
pn_delivery(link, r.tag);
QPID_LOG(debug, "Requested delivery of " << r.msg.getSequence() << " from " << queue->getName() << ", index=" << r.index);
++outstanding;
return true;
}
void Outgoing::notify()
{
QPID_LOG(trace, "Notification received for " << queue->getName());
out.activateOutput();
}
bool Outgoing::accept(const qpid::broker::Message&)
{
return true;
}
void Outgoing::setSubjectFilter(const std::string& f)
{
subjectFilter = f;
}
namespace {
bool match(TokenIterator& filter, TokenIterator& target)
{
bool wild = false;
while (!filter.finished())
{
if (filter.match1('*')) {
if (target.finished()) return false;
//else move to next word in filter target
filter.next();
target.next();
} else if (filter.match1('#')) {
// i.e. filter word is '#' which can match a variable number of words in the target
filter.next();
if (filter.finished()) return true;
else if (target.finished()) return false;
wild = true;
} else {
//filter word needs to match target exactly
if (target.finished()) return false;
std::string word;
target.pop(word);
if (filter.match(word)) {
wild = false;
filter.next();
} else if (!wild) {
return false;
}
}
}
return target.finished();
}
bool match(const std::string& filter, const std::string& target)
{
TokenIterator lhs(filter);
TokenIterator rhs(target);
return match(lhs, rhs);
}
}
bool Outgoing::filter(const qpid::broker::Message& m)
{
return subjectFilter.empty() || subjectFilter == m.getRoutingKey() || match(subjectFilter, m.getRoutingKey());
}
void Outgoing::cancel() {}
void Outgoing::acknowledged(const qpid::broker::DeliveryRecord&) {}
qpid::broker::OwnershipToken* Outgoing::getSession()
{
return 0;
}
Outgoing::Record::Record() : delivery(0), disposition(0), index(0) {}
void Outgoing::Record::init(size_t i)
{
index = i;
tag.bytes = reinterpret_cast<const char*>(&index);
tag.size = sizeof(index);
}
void Outgoing::Record::reset()
{
cursor = QueueCursor();
msg = qpid::broker::Message();
delivery = 0;
disposition = 0;
}
}}} // namespace qpid::broker::amqp
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