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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 "ReplicationExchange.h"
#include "constants.h"
#include "qpid/Plugin.h"
#include "qpid/broker/Broker.h"
#include "qpid/broker/ExchangeRegistry.h"
#include "qpid/framing/reply_exceptions.h"
#include "qpid/log/Statement.h"
#include <boost/bind.hpp>
namespace qpid {
namespace replication {
using namespace qpid::broker;
using namespace qpid::framing;
using namespace qpid::replication::constants;
ReplicationExchange::ReplicationExchange(const std::string& name, bool durable,
const FieldTable& args,
QueueRegistry& qr,
Manageable* parent)
: Exchange(name, durable, args, parent), queues(qr), init(false) {}
std::string ReplicationExchange::getType() const { return typeName; }
void ReplicationExchange::route(Deliverable& msg, const std::string& /*routingKey*/, const FieldTable* args)
{
if (args) {
int eventType = args->getAsInt(REPLICATION_EVENT_TYPE);
if (eventType) {
if (isDuplicate(args)) return;
switch (eventType) {
case ENQUEUE:
handleEnqueueEvent(args, msg);
return;
case DEQUEUE:
handleDequeueEvent(args);
return;
default:
throw IllegalArgumentException(QPID_MSG("Illegal value for " << REPLICATION_EVENT_TYPE << ": " << eventType));
}
}
} else {
QPID_LOG(warning, "Dropping unexpected message with no headers");
}
}
void ReplicationExchange::handleEnqueueEvent(const FieldTable* args, Deliverable& msg)
{
std::string queueName = args->getAsString(REPLICATION_TARGET_QUEUE);
Queue::shared_ptr queue = queues.find(queueName);
FieldTable& headers = msg.getMessage().getProperties<MessageProperties>()->getApplicationHeaders();
headers.erase(REPLICATION_TARGET_QUEUE);
headers.erase(REPLICATION_EVENT_SEQNO);
headers.erase(REPLICATION_EVENT_TYPE);
msg.deliverTo(queue);
QPID_LOG(debug, "Enqueued replicated message onto " << queue);
}
void ReplicationExchange::handleDequeueEvent(const FieldTable* args)
{
std::string queueName = args->getAsString(REPLICATION_TARGET_QUEUE);
Queue::shared_ptr queue = queues.find(queueName);
SequenceNumber position(args->getAsInt(DEQUEUED_MESSAGE_POSITION));
QueuedMessage dequeued;
if (queue->acquireMessageAt(position, dequeued)) {
queue->dequeue(0, dequeued);
QPID_LOG(debug, "Processed replicated 'dequeue' event from " << queueName << " at position " << position);
} else {
QPID_LOG(warning, "Could not acquire message " << position << " from " << queueName);
}
}
bool ReplicationExchange::isDuplicate(const FieldTable* args)
{
SequenceNumber seqno(args->getAsInt(REPLICATION_EVENT_SEQNO));
if (!init) {
init = true;
sequence = seqno;
return false;
} else if (seqno > sequence) {
if (seqno - sequence > 1) {
QPID_LOG(error, "Gap in replication event sequence between: " << sequence << " and " << seqno);
}
sequence = seqno;
return false;
} else {
QPID_LOG(info, "Duplicate detected: seqno=" << seqno << " (last seqno=" << sequence << ")");
return true;
}
}
bool ReplicationExchange::bind(Queue::shared_ptr /*queue*/, const std::string& /*routingKey*/, const FieldTable* /*args*/)
{
throw NotImplementedException("Replication exchange does not support bind operation");
}
bool ReplicationExchange::unbind(Queue::shared_ptr /*queue*/, const std::string& /*routingKey*/, const FieldTable* /*args*/)
{
throw NotImplementedException("Replication exchange does not support unbind operation");
}
bool ReplicationExchange::isBound(Queue::shared_ptr /*queue*/, const string* const /*routingKey*/, const FieldTable* const /*args*/)
{
return false;
}
const std::string ReplicationExchange::typeName("replication");
struct ReplicationExchangePlugin : Plugin
{
Broker* broker;
ReplicationExchangePlugin();
void earlyInitialize(Plugin::Target& target);
void initialize(Plugin::Target& target);
Exchange::shared_ptr create(const std::string& name, bool durable,
const framing::FieldTable& args,
management::Manageable* parent);
};
ReplicationExchangePlugin::ReplicationExchangePlugin() : broker(0) {}
Exchange::shared_ptr ReplicationExchangePlugin::create(const std::string& name, bool durable,
const framing::FieldTable& args,
management::Manageable* parent)
{
Exchange::shared_ptr e(new ReplicationExchange(name, durable, args, broker->getQueues(), parent));
return e;
}
void ReplicationExchangePlugin::initialize(Plugin::Target& target)
{
broker = dynamic_cast<broker::Broker*>(&target);
if (broker) {
ExchangeRegistry::FactoryFunction f = boost::bind(&ReplicationExchangePlugin::create, this, _1, _2, _3, _4);
broker->getExchanges().registerType(ReplicationExchange::typeName, f);
QPID_LOG(info, "Registered replication exchange");
}
}
void ReplicationExchangePlugin::earlyInitialize(Target&) {}
static ReplicationExchangePlugin exchangePlugin;
}} // namespace qpid::replication
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