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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 "Event.h"
#include "HaBroker.h"
#include "Primary.h"
#include "PrimaryTxObserver.h"
#include "QueueGuard.h"
#include "RemoteBackup.h"
#include "ReplicatingSubscription.h"
#include "QueueReplicator.h"
#include "qpid/broker/Broker.h"
#include "qpid/broker/Queue.h"
#include <boost/lexical_cast.hpp>
#include <algorithm>
namespace qpid {
namespace framing {
class FieldTable;
}
namespace ha {
using namespace std;
using namespace qpid::broker;
using namespace qpid::framing;
using types::Uuid;
// Exchange to receive prepare OK events.
class PrimaryTxObserver::Exchange : public broker::Exchange {
public:
Exchange(const boost::shared_ptr<PrimaryTxObserver>& tx_) :
broker::Exchange(tx_->getExchangeName()),
tx(tx_)
{
dispatch[TxPrepareOkEvent::KEY] =
boost::bind(&PrimaryTxObserver::txPrepareOkEvent, tx, _1);
dispatch[TxPrepareFailEvent::KEY] =
boost::bind(&PrimaryTxObserver::txPrepareFailEvent, tx, _1);
}
void route(Deliverable& deliverable) {
const broker::Message& message(deliverable.getMessage());
DispatchMap::iterator i = dispatch.find(message.getRoutingKey());
if (i != dispatch.end()) i->second(message.getContent());
}
bool bind(boost::shared_ptr<Queue>, const string&, const FieldTable*) { return false; }
bool unbind(boost::shared_ptr<Queue>, const string&, const FieldTable*) { return false; }
bool isBound(boost::shared_ptr<Queue>, const string* const, const FieldTable* const) { return false; }
string getType() const { return TYPE_NAME; }
private:
static const string TYPE_NAME;
typedef boost::function<void(const std::string&)> DispatchFn;
typedef qpid::sys::unordered_map<std::string, DispatchFn> DispatchMap;
DispatchMap dispatch;
boost::shared_ptr<PrimaryTxObserver> tx;
};
const string PrimaryTxObserver::Exchange::TYPE_NAME(string(QPID_HA_PREFIX)+"primary-tx-observer");
PrimaryTxObserver::PrimaryTxObserver(
Primary& p, HaBroker& hb, const boost::intrusive_ptr<broker::TxBuffer>& tx
) :
primary(p), haBroker(hb), broker(hb.getBroker()),
replicationTest(hb.getSettings().replicateDefault.get()),
txBuffer(tx),
id(true),
exchangeName(TRANSACTION_REPLICATOR_PREFIX+id.str()),
complete(false)
{
logPrefix = "Primary transaction "+shortStr(id)+": ";
// The brokers known at this point are the ones that will be included
// in the transaction. Brokers that join later are not included.
//
BrokerInfo::Set backups(haBroker.getMembership().otherBackups());
std::transform(backups.begin(), backups.end(), inserter(members, members.begin()),
boost::bind(&BrokerInfo::getSystemId, _1));
QPID_LOG(debug, logPrefix << "Started TX " << id);
QPID_LOG(debug, logPrefix << "Members: " << members);
unprepared = unfinished = members;
pair<QueuePtr, bool> result =
broker.getQueues().declare(
exchangeName, QueueSettings(/*durable*/false, /*autodelete*/true));
assert(result.second);
txQueue = result.first;
txQueue->deliver(TxMembersEvent(members).message());
}
PrimaryTxObserver::~PrimaryTxObserver() {
QPID_LOG(debug, logPrefix << "Ended");
}
void PrimaryTxObserver::initialize() {
boost::shared_ptr<Exchange> ex(new Exchange(shared_from_this()));
FieldTable args = ex->getArgs();
args.setString(QPID_REPLICATE, printable(NONE).str()); // Set replication arg.
broker.getExchanges().registerExchange(ex);
}
void PrimaryTxObserver::enqueue(const QueuePtr& q, const broker::Message& m)
{
sys::Mutex::ScopedLock l(lock);
if (replicationTest.useLevel(*q) == ALL) { // Ignore unreplicated queues.
QPID_LOG(trace, logPrefix << "Enqueue: " << LogMessageId(*q, m));
enqueues[q] += m.getReplicationId();
txQueue->deliver(TxEnqueueEvent(q->getName(), m.getReplicationId()).message());
txQueue->deliver(m);
}
}
void PrimaryTxObserver::dequeue(
const QueuePtr& q, QueuePosition pos, ReplicationId id)
{
sys::Mutex::ScopedLock l(lock);
if (replicationTest.useLevel(*q) == ALL) { // Ignore unreplicated queues.
QPID_LOG(trace, logPrefix << "Dequeue: " << LogMessageId(*q, pos, id));
txQueue->deliver(TxDequeueEvent(q->getName(), id).message());
}
else {
QPID_LOG(warning, logPrefix << "Dequeue skipped, queue not replicated: "
<< LogMessageId(*q, pos, id));
}
}
namespace {
struct Skip {
Uuid backup;
boost::shared_ptr<broker::Queue> queue;
ReplicationIdSet ids;
Skip(const Uuid& backup_,
const boost::shared_ptr<broker::Queue>& queue_,
const ReplicationIdSet& ids_) :
backup(backup_), queue(queue_), ids(ids_) {}
void skip(Primary& p) const { p.skip(backup, queue, ids); }
};
} // namespace
bool PrimaryTxObserver::prepare() {
QPID_LOG(debug, logPrefix << "Prepare " << members);
vector<Skip> skips;
{
sys::Mutex::ScopedLock l(lock);
for (size_t i = 0; i < members.size(); ++i) txBuffer->startCompleter();
// Tell replicating subscriptions to skip IDs in the transaction.
for (UuidSet::iterator b = members.begin(); b != members.end(); ++b)
for (QueueIdsMap::iterator q = enqueues.begin(); q != enqueues.end(); ++q)
skips.push_back(Skip(*b, q->first, q->second));
}
// Outside lock
for_each(skips.begin(), skips.end(),
boost::bind(&Skip::skip, _1, boost::ref(primary)));
txQueue->deliver(TxPrepareEvent().message());
return true;
}
void PrimaryTxObserver::commit() {
QPID_LOG(debug, logPrefix << "Commit");
sys::Mutex::ScopedLock l(lock);
txQueue->deliver(TxCommitEvent().message());
complete = true;
end(l);
}
void PrimaryTxObserver::rollback() {
QPID_LOG(debug, logPrefix << "Rollback");
sys::Mutex::ScopedLock l(lock);
txQueue->deliver(TxRollbackEvent().message());
complete = true;
end(l);
}
void PrimaryTxObserver::end(sys::Mutex::ScopedLock&) {
// Don't destroy the tx-queue until the transaction is complete and there
// are no connected subscriptions.
if (txBuffer && complete && unfinished.empty()) {
txBuffer = 0; // Break pointer cycle.
try {
haBroker.getBroker().deleteQueue(txQueue->getName(), haBroker.getUserId(), string());
} catch (const std::exception& e) {
QPID_LOG(error, logPrefix << "Deleting transaction queue: " << e.what());
}
try {
broker.getExchanges().destroy(getExchangeName());
} catch (const std::exception& e) {
QPID_LOG(error, logPrefix << "Deleting transaction exchange: " << e.what());
}
}
}
void PrimaryTxObserver::txPrepareOkEvent(const string& data) {
sys::Mutex::ScopedLock l(lock);
types::Uuid backup = decodeStr<TxPrepareOkEvent>(data).broker;
if (unprepared.erase(backup)) {
QPID_LOG(debug, logPrefix << "Backup prepared ok: " << backup);
txBuffer->finishCompleter();
}
}
void PrimaryTxObserver::txPrepareFailEvent(const string& data) {
sys::Mutex::ScopedLock l(lock);
types::Uuid backup = decodeStr<TxPrepareFailEvent>(data).broker;
if (unprepared.erase(backup)) {
QPID_LOG(error, logPrefix << "Prepare failed on backup: " << backup);
txBuffer->setError(
QPID_MSG(logPrefix << "Prepare failed on backup: " << backup));
txBuffer->finishCompleter();
}
}
void PrimaryTxObserver::cancel(const ReplicatingSubscription& rs) {
sys::Mutex::ScopedLock l(lock);
types::Uuid backup = rs.getBrokerInfo().getSystemId();
if (unprepared.erase(backup) ){
complete = true; // Cancelled before prepared.
txBuffer->setError(
QPID_MSG(logPrefix << "Backup disconnected: " << rs.getBrokerInfo()));
txBuffer->finishCompleter();
}
unfinished.erase(backup);
end(l);
}
}} // namespace qpid::ha
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