broker: Fixed incorrect pass-by-reference of Queue::shared_ptr in several files.

cluster: added FailoverExchange - send cluster membership to clients.
client: added FailoverListener - receive cluster updates from failover exchange.


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@702552 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 99 insertions, 0 deletions

diff --git a/cpp/src/qpid/cluster/FailoverExchange.cpp b/cpp/src/qpid/cluster/FailoverExchange.cpp
new file mode 100644
index 0000000000..abc7f5df6f
--- /dev/null
+++ b/cpp/src/qpid/cluster/FailoverExchange.cpp
@@ -0,0 +1,99 @@
+/*
+ *
+ * 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 "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 <boost/bind.hpp>
+#include <algorithm>
+
+namespace qpid {
+namespace cluster {
+using namespace std;
+
+using namespace broker;
+using namespace framing;
+
+const string FailoverExchange::TYPE_NAME("amq.failover");
+
+FailoverExchange::FailoverExchange(management::Manageable* parent) : Exchange(TYPE_NAME, parent) {
+    if (mgmtExchange != 0)
+        mgmtExchange->set_type(TYPE_NAME);
+}
+
+
+void FailoverExchange::setUrls(const vector<Url>& u) {
+    Lock l(lock);
+    urls=u;
+    if (urls.empty()) return;
+    std::for_each(queues.begin(), queues.end(),
+                  boost::bind(&FailoverExchange::sendUpdate, this, _1));
+}
+
+string FailoverExchange::getType() const { return TYPE_NAME; }
+
+bool FailoverExchange::bind(Queue::shared_ptr queue, const string&, const framing::FieldTable*) {
+    Lock l(lock);
+    sendUpdate(queue);
+    return queues.insert(queue).second;
+}
+
+bool FailoverExchange::unbind(Queue::shared_ptr queue, const string&, const framing::FieldTable*) {
+    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();
+}
+
+void FailoverExchange::route(Deliverable&, const string& , const framing::FieldTable* ) {
+    QPID_LOG(warning, "Message received by exchange " << TYPE_NAME << " ignoring");
+}
+
+void FailoverExchange::sendUpdate(const Queue::shared_ptr& queue) {
+    // Called with lock held.
+    if (urls.empty()) return;
+    framing::Array array(0x95); // FIXME aconway 2008-10-06: Array is unusable like this. Need type constants or better mapping.
+    for (Urls::const_iterator i = urls.begin(); i != urls.end(); ++i) 
+        array.add(boost::shared_ptr<Str16Value>(new Str16Value(i->str())));
+    const ProtocolVersion v;
+    boost::intrusive_ptr<Message> msg(new Message);
+    AMQFrame command(MessageTransferBody(v, TYPE_NAME, 1, 0));
+    command.setLastSegment(false);
+    msg->getFrames().append(command);
+    AMQHeaderBody header;
+    header.get<MessageProperties>(true)->setContentLength(0);
+    header.get<MessageProperties>(true)->getApplicationHeaders().setArray(TYPE_NAME, array);
+    AMQFrame headerFrame(header);
+    headerFrame.setFirstSegment(false);
+    msg->getFrames().append(headerFrame);    
+    DeliverableMessage(msg).deliverTo(queue);
+}
+
+}} // namespace cluster