QPID-4327: HA TX transactions: basic replication.

On primary a PrimaryTxObserver observes a transaction's TxBuffer and generates
transaction events on a tx-replication-queue. On the backup a TxReplicator
receives the events and constructs a TxBuffer equivalent to the one in the
primary.

Unfinished:
- Primary does not wait for backups to prepare() before committing.
- All connected backups are assumed to be in the transaction, there are race
  conditions around brokers joining/leavinv where this assumption is invalid.
- Need more tests.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1509423 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 39 insertions, 2 deletions

diff --git a/qpid/cpp/src/qpid/ha/Primary.cpp b/qpid/cpp/src/qpid/ha/Primary.cpp
index bae651a3fc..5fd7814d62 100644
--- a/qpid/cpp/src/qpid/ha/Primary.cpp
+++ b/qpid/cpp/src/qpid/ha/Primary.cpp
@@ -27,6 +27,7 @@
 #include "RemoteBackup.h"
 #include "ConnectionObserver.h"
 #include "QueueReplicator.h"
+#include "PrimaryTxObserver.h"
 #include "qpid/assert.h"
 #include "qpid/broker/Broker.h"
 #include "qpid/broker/BrokerObserver.h"
@@ -34,16 +35,19 @@
 #include "qpid/broker/Queue.h"
 #include "qpid/framing/FieldTable.h"
 #include "qpid/framing/FieldValue.h"
-#include "qpid/framing/Uuid.h"
 #include "qpid/log/Statement.h"
+#include "qpid/types/Uuid.h"
 #include "qpid/sys/Timer.h"
 #include <boost/bind.hpp>
+#include <boost/make_shared.hpp>
+#include <boost/shared_ptr.hpp>
 
 namespace qpid {
 namespace ha {
 
 using sys::Mutex;
 using boost::shared_ptr;
+using boost::make_shared;
 using namespace std;
 using namespace framing;
 
@@ -67,7 +71,10 @@ class PrimaryBrokerObserver : public broker::BrokerObserver
     void queueDestroy(const Primary::QueuePtr& q) { primary.queueDestroy(q); }
     void exchangeCreate(const Primary::ExchangePtr& q) { primary.exchangeCreate(q); }
     void exchangeDestroy(const Primary::ExchangePtr& q) { primary.exchangeDestroy(q); }
-  private:
+    void startTx(const shared_ptr<broker::TxBuffer>& tx) { primary.startTx(tx); }
+    void startDtx(const shared_ptr<broker::DtxBuffer>& dtx) { primary.startDtx(dtx); }
+
+ private:
     Primary& primary;
 };
 
@@ -208,6 +215,26 @@ void Primary::readyReplica(const ReplicatingSubscription& rs) {
     if (backup) checkReady(backup);
 }
 
+void Primary::addReplica(ReplicatingSubscription& rs) {
+    sys::Mutex::ScopedLock l(lock);
+    replicas[make_pair(rs.getBrokerInfo().getSystemId(), rs.getQueue())] = &rs;
+}
+
+void Primary::skip(
+    const types::Uuid& backup,
+    const boost::shared_ptr<broker::Queue>& queue,
+    const ReplicationIdSet& ids)
+{
+    sys::Mutex::ScopedLock l(lock);
+    ReplicaMap::const_iterator i = replicas.find(make_pair(backup, queue));
+    if (i != replicas.end()) i->second->addSkip(ids);
+}
+
+void Primary::removeReplica(const ReplicatingSubscription& rs) {
+    sys::Mutex::ScopedLock l(lock);
+    replicas.erase(make_pair(rs.getBrokerInfo().getSystemId(), rs.getQueue()));
+}
+
 // NOTE: Called with queue registry lock held.
 void Primary::queueCreate(const QueuePtr& q) {
     // Set replication argument.
@@ -361,4 +388,14 @@ void Primary::setCatchupQueues(const RemoteBackupPtr& backup, bool createGuards)
     backup->startCatchup();
 }
 
+void Primary::startTx(const boost::shared_ptr<broker::TxBuffer>& tx) {
+    QPID_LOG(trace, logPrefix << "Started TX transaction");
+    tx->setObserver(make_shared<PrimaryTxObserver>(boost::ref(haBroker)));
+}
+
+void Primary::startDtx(const boost::shared_ptr<broker::DtxBuffer>& dtx) {
+    QPID_LOG(trace, logPrefix << "Started DTX transaction");
+    dtx->setObserver(make_shared<PrimaryTxObserver>(boost::ref(haBroker)));
+}
+
 }} // namespace qpid::ha