QPID-3603: Introduced RemoteBackup to track backup status.

The primary creates RemoteBackup object for each connected or expected
backup. On first being promoted, the new primary has a RemoteBackup
for each of the known backups at the time of the failure.

The RemoteBackup manages queue guards for its backup and
tracks it's readiness.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@1349540 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 81 insertions, 0 deletions

diff --git a/cpp/src/qpid/ha/RemoteBackup.cpp b/cpp/src/qpid/ha/RemoteBackup.cpp
new file mode 100644
index 0000000000..94e60d7ed8
--- /dev/null
+++ b/cpp/src/qpid/ha/RemoteBackup.cpp
@@ -0,0 +1,81 @@
+/*
+ *
+ * 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 "RemoteBackup.h"
+#include "QueueGuard.h"
+#include "qpid/broker/Broker.h"
+#include "qpid/broker/Queue.h"
+#include "qpid/broker/QueueRegistry.h"
+#include <boost/bind.hpp>
+
+namespace qpid {
+namespace ha {
+
+using sys::Mutex;
+
+RemoteBackup::RemoteBackup(
+    const BrokerInfo& info, broker::Broker& broker, ReplicationTest rt) :
+    logPrefix("HA backup "+info.getLogId()+": "), brokerInfo(info), replicationTest(rt)
+{
+    QPID_LOG(debug, logPrefix << "Guarding queues for backup broker. ");
+    broker.getQueues().eachQueue(boost::bind(&RemoteBackup::initialQueue, this, _1));
+}
+
+bool RemoteBackup::isReady() {
+    return initialQueues.empty();
+}
+
+void RemoteBackup::initialQueue(const QueuePtr& q) {
+    initialQueues.insert(q);
+    queueCreate(q);
+}
+
+RemoteBackup::GuardPtr RemoteBackup::guard(const QueuePtr& q) {
+    GuardMap::iterator i = guards.find(q);
+    if (i == guards.end()) {
+        assert(0);
+        throw Exception(logPrefix+": Guard cannot find queue guard: "+q->getName());
+    }
+    GuardPtr guard = i->second;
+    guards.erase(i);
+    return guard;
+}
+
+void RemoteBackup::ready(const QueuePtr& q) {
+    initialQueues.erase(q);
+}
+
+void RemoteBackup::queueCreate(const QueuePtr& q) {
+    if (replicationTest.isReplicated(ALL, *q)) {
+        QPID_LOG(debug, logPrefix << "Setting guard on " << q->getName());
+        guards[q].reset(new QueueGuard(*q, brokerInfo));
+    }
+}
+
+void RemoteBackup::queueDestroy(const QueuePtr& q) {
+    initialQueues.erase(q);
+    GuardMap::iterator i = guards.find(q);
+    if (i != guards.end()) {
+        i->second->cancel();
+        guards.erase(i);
+    }
+}
+
+}} // namespace qpid::ha