src/qpid/messaging/FailoverUpdates.cpp

/*
 *
 * 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.
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#include "qpid/messaging/FailoverUpdates.h"
#include "qpid/messaging/Connection.h"
#include "qpid/messaging/Message.h"
#include "qpid/messaging/Receiver.h"
#include "qpid/messaging/Session.h"
#include "qpid/sys/Runnable.h"
#include "qpid/sys/Thread.h"
#include "qpid/log/Statement.h"
#include "qpid/Exception.h"
#include "qpid/Url.h"
#include "qpid/framing/Uuid.h"
#include <vector>

namespace qpid {
namespace messaging {
using framing::Uuid;

struct FailoverUpdatesImpl : qpid::sys::Runnable
{
    Connection connection;
    Session session;
    Receiver receiver;
    qpid::sys::Thread thread;

    FailoverUpdatesImpl(Connection& c) : connection(c)
    {
        session = connection.createSession("failover-updates."+Uuid(true).str());
        receiver = session.createReceiver("amq.failover");
        thread = qpid::sys::Thread(*this);
    }

    ~FailoverUpdatesImpl() {
        try {
            session.close();
        } catch(...) {}         // Squash exceptions in a destructor.
        thread.join();
    }

    void run()
    {
        try {
            Message message;
            while (receiver.fetch(message)) {
                connection.setOption("reconnect-urls", message.getProperties()["amq.failover"]);
                QPID_LOG(debug, "Set reconnect-urls to " << message.getProperties()["amq.failover"]);
                session.acknowledge();
            }
        }
        catch (const ClosedException&) {}
        catch (const qpid::TransportFailure& e) {
            QPID_LOG(warning, "Failover updates stopped on loss of connection. " << e.what());
        }
        catch (const std::exception& e) {
            QPID_LOG(warning, "Failover updates stopped due to exception: " << e.what());
        }
    }
};

FailoverUpdates::FailoverUpdates(Connection& connection) : impl(new FailoverUpdatesImpl(connection)) {}
FailoverUpdates::~FailoverUpdates() { if (impl) { delete impl; } }
FailoverUpdates::FailoverUpdates(const FailoverUpdates&) : impl(0) {}
FailoverUpdates& FailoverUpdates::operator=(const FailoverUpdates&) { return *this; }


}} // namespace qpid::messaging