Added queue policy class for controlling when message content should be released from memory.

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@482639 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 49 insertions, 0 deletions

diff --git a/cpp/lib/broker/QueuePolicy.cpp b/cpp/lib/broker/QueuePolicy.cpp
new file mode 100644
index 0000000000..3cf0882695
--- /dev/null
+++ b/cpp/lib/broker/QueuePolicy.cpp
@@ -0,0 +1,49 @@
+/*
+ *
+ * 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 <QueuePolicy.h>
+
+using namespace qpid::broker;
+
+QueuePolicy::QueuePolicy(u_int32_t _maxCount, u_int64_t _maxSize) : maxCount(_maxCount), maxSize(_maxSize) {}
+
+void QueuePolicy::enqueued(Message::shared_ptr& msg, MessageStore* store)
+{
+    if (checkCount(msg) || checkSize(msg)) {
+        msg->releaseContent(store);
+    }
+}
+
+void QueuePolicy::dequeued(Message::shared_ptr& msg, MessageStore* /*store*/)
+{
+    if (maxCount) count--;
+    if (maxSize) size -= msg->contentSize();
+}
+
+bool QueuePolicy::checkCount(Message::shared_ptr& /*msg*/)
+{
+    return maxCount && ++count > maxCount;
+}
+
+bool QueuePolicy::checkSize(Message::shared_ptr& msg)
+{
+    return maxSize && (size += msg->contentSize()) > maxSize;
+}
+