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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 "FailoverListener.h"
#include "SessionBase_0_10Access.h"
#include "qpid/client/SubscriptionManager.h"
#include "qpid/framing/Uuid.h"
#include "qpid/log/Statement.h"
#include "qpid/log/Helpers.h"
namespace qpid {
namespace client {
static const std::string AMQ_FAILOVER("amq.failover");
static Session makeSession(boost::shared_ptr<SessionImpl> si) {
// Hold only a weak pointer to the ConnectionImpl so a
// FailoverListener in a ConnectionImpl won't createa a shared_ptr
// cycle.
//
si->setWeakPtr(true);
Session s;
SessionBase_0_10Access(s).set(si);
return s;
}
FailoverListener::FailoverListener(const boost::shared_ptr<ConnectionImpl>& c, const std::vector<Url>& initUrls)
: knownBrokers(initUrls)
{
// Special versions used to mark cluster catch-up connections
// which do not need a FailoverListener
if (c->getVersion().getMajor() >= 0x80) {
QPID_LOG(debug, "No failover listener for catch-up connection.");
return;
}
Session session = makeSession(c->newSession(AMQ_FAILOVER+framing::Uuid(true).str(), 0));
if (session.exchangeQuery(arg::name=AMQ_FAILOVER).getNotFound()) {
session.close();
return;
}
subscriptions.reset(new SubscriptionManager(session));
std::string qname=session.getId().getName();
session.queueDeclare(arg::queue=qname, arg::exclusive=true, arg::autoDelete=true);
session.exchangeBind(arg::queue=qname, arg::exchange=AMQ_FAILOVER);
subscriptions->subscribe(*this, qname, SubscriptionSettings(FlowControl::unlimited(), ACCEPT_MODE_NONE));
thread = sys::Thread(*this);
}
void FailoverListener::run()
{
try {
subscriptions->run();
} catch (const TransportFailure&) {
} catch (const std::exception& e) {
QPID_LOG(error, QPID_MSG(e.what()));
}
}
FailoverListener::~FailoverListener() {
try { stop(); }
catch (const std::exception& /*e*/) {}
}
void FailoverListener::stop() {
if (subscriptions.get())
subscriptions->stop();
if (thread.id() == sys::Thread::current().id()) {
// FIXME aconway 2008-10-16: this can happen if ConnectionImpl
// dtor runs when my session drops its weak pointer lock.
// For now, leak subscriptions to prevent a core if we delete
// without joining.
subscriptions.release();
}
else if (thread.id()) {
thread.join();
thread=sys::Thread();
subscriptions.reset(); // Safe to delete after join.
}
}
void FailoverListener::received(Message& msg) {
sys::Mutex::ScopedLock l(lock);
knownBrokers.clear();
framing::Array urlArray;
msg.getHeaders().getArray("amq.failover", urlArray);
for (framing::Array::ValueVector::const_iterator i = urlArray.begin(); i != urlArray.end(); ++i )
knownBrokers.push_back(Url((*i)->get<std::string>()));
QPID_LOG(info, "Known-brokers update: " << log::formatList(knownBrokers));
}
std::vector<Url> FailoverListener::getKnownBrokers() const {
sys::Mutex::ScopedLock l(lock);
return knownBrokers;
}
}} // namespace qpid::client
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