1 files changed, 82 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/cluster/exp/Multicaster.cpp b/qpid/cpp/src/qpid/cluster/exp/Multicaster.cpp
new file mode 100644
index 0000000000..bdf6c33387
--- /dev/null
+++ b/qpid/cpp/src/qpid/cluster/exp/Multicaster.cpp
@@ -0,0 +1,82 @@
+/*
+ *
+ * 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 "Multicaster.h"
+#include "qpid/cluster/Cpg.h"
+#include "qpid/log/Statement.h"
+
+namespace qpid {
+namespace cluster {
+
+namespace {
+const size_t MAX_IOV = 60;  // Limit imposed by CPG
+
+struct ::iovec bufToIov(const BufferRef& buf) {
+    ::iovec iov;
+    iov.iov_base = buf.begin();
+    iov.iov_len = buf.size();
+    return iov;
+}
+}
+
+Multicaster::Multicaster(Cpg& cpg_,
+                         const boost::shared_ptr<sys::Poller>& poller,
+                         boost::function<void()> onError_) :
+    onError(onError_), cpg(cpg_),
+    queue(boost::bind(&Multicaster::sendMcast, this, _1), poller),
+    ioVector(MAX_IOV),
+    buffers(64*1024)           // TODO aconway 2011-03-15: optimum size?
+{
+    queue.start();
+}
+
+void Multicaster::mcast(const framing::AMQDataBlock& data) {
+    BufferRef bufRef = buffers.get(data.encodedSize());
+    framing::Buffer buf(bufRef.begin(), bufRef.size());
+    data.encode(buf);
+    queue.push(bufRef);
+}
+
+Multicaster::PollableEventQueue::Batch::const_iterator
+Multicaster::sendMcast(const PollableEventQueue::Batch& buffers) {
+    try {
+        PollableEventQueue::Batch::const_iterator i = buffers.begin();
+        while( i != buffers.end()) {
+            size_t len = std::min(size_t(buffers.end() - i), MAX_IOV);
+            PollableEventQueue::Batch::const_iterator j = i + len;
+            std::transform(i, j, ioVector.begin(), &bufToIov);
+            if (!cpg.mcast(&ioVector[0], len)) {
+                // CPG didn't send because of CPG flow control.
+                return i;
+            }
+            i = j;
+        }
+        return i;
+    }
+    catch (const std::exception& e) {
+        QPID_LOG(critical, "Multicast error: " << e.what());
+        queue.stop();
+        onError();
+        return buffers.end();
+    }
+}
+
+}} // namespace qpid::cluster