1 files changed, 133 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/ha/FailoverExchange.cpp b/qpid/cpp/src/qpid/ha/FailoverExchange.cpp
new file mode 100644
index 0000000000..9bda5ea5bf
--- /dev/null
+++ b/qpid/cpp/src/qpid/ha/FailoverExchange.cpp
@@ -0,0 +1,133 @@
+/*
+ *
+ * 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 "FailoverExchange.h"
+#include "Event.h"
+#include "qpid/broker/amqp_0_10/MessageTransfer.h"
+#include "qpid/broker/Message.h"
+#include "qpid/broker/DeliverableMessage.h"
+#include "qpid/broker/Queue.h"
+#include "qpid/framing/MessageProperties.h"
+#include "qpid/framing/AMQFrame.h"
+#include "qpid/framing/AMQHeaderBody.h"
+#include "qpid/framing/MessageTransferBody.h"
+#include "qpid/log/Statement.h"
+#include "qpid/framing/Array.h"
+#include "qpid/RefCounted.h"
+#include "qpid/UrlArray.h"
+#include <boost/bind.hpp>
+#include <algorithm>
+
+
+namespace qpid {
+namespace ha {
+
+using namespace std;
+
+using namespace broker;
+using namespace framing;
+using broker::amqp_0_10::MessageTransfer;
+
+const string FailoverExchange::typeName("amq.failover");
+
+namespace {
+struct OstreamUrls {
+    OstreamUrls(const FailoverExchange::Urls& u) : urls(u) {}
+    FailoverExchange::Urls urls;
+};
+
+ostream& operator<<(ostream& o, const OstreamUrls& urls) {
+    ostream_iterator<qpid::Url> out(o, " ");
+    copy(urls.urls.begin(), urls.urls.end(), out);
+    return o;
+}
+}
+
+FailoverExchange::FailoverExchange(management::Manageable& parent, Broker& b)
+    : Exchange(typeName, &parent, &b)
+{
+    if (mgmtExchange != 0)
+        mgmtExchange->set_type(typeName);
+}
+
+void FailoverExchange::setUrls(const vector<Url>& u) {
+    QPID_LOG(debug, typeName << " URLs set to " << OstreamUrls(u));
+    Lock l(lock);
+    urls = u;
+}
+
+void FailoverExchange::updateUrls(const vector<Url>& u) {
+    QPID_LOG(debug, typeName << " Updating URLs " << OstreamUrls(u) << " to "
+             << queues.size() << " subscribers.");
+    Lock l(lock);
+    urls=u;
+    if (!urls.empty() && !queues.empty()) {
+        for (Queues::const_iterator i = queues.begin(); i != queues.end(); ++i)
+            sendUpdate(*i, l);
+    }
+}
+
+string FailoverExchange::getType() const { return typeName; }
+
+bool FailoverExchange::bind(Queue::shared_ptr queue, const string&,
+                            const framing::FieldTable*) {
+    QPID_LOG(debug, typeName << " binding " << queue->getName());
+    Lock l(lock);
+    sendUpdate(queue, l);
+    return queues.insert(queue).second;
+}
+
+bool FailoverExchange::unbind(Queue::shared_ptr queue, const string&,
+                              const framing::FieldTable*) {
+    QPID_LOG(debug, typeName << " un-binding " << queue->getName());
+    Lock l(lock);
+    return queues.erase(queue);
+}
+
+bool FailoverExchange::isBound(Queue::shared_ptr queue, const string* const,
+                               const framing::FieldTable*) {
+    Lock l(lock);
+    return queues.find(queue) != queues.end();
+}
+
+bool FailoverExchange::hasBindings() {
+    Lock l(lock);
+    return !queues.empty();
+}
+
+void FailoverExchange::route(Deliverable&) {
+    QPID_LOG(warning, typeName << " unexpected message, ignored.");
+}
+
+void FailoverExchange::sendUpdate(const Queue::shared_ptr& queue, sys::Mutex::ScopedLock&) {
+    QPID_LOG(debug, typeName << " sending " << OstreamUrls(urls) << " to " << queue->getName());
+    if (urls.empty()) return;
+    framing::Array array = vectorToUrlArray(urls);
+    const ProtocolVersion v;
+    broker::Message message(makeMessage(std::string(), typeName, typeName));
+    MessageTransfer& transfer = MessageTransfer::get(message);
+    MessageProperties* props =
+        transfer.getFrames().getHeaders()->get<framing::MessageProperties>(true);
+    props->setContentLength(0);
+    props->getApplicationHeaders().setArray(typeName, array);
+    DeliverableMessage(message, 0).deliverTo(queue);
+}
+
+}} // namespace ha