1 files changed, 74 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/broker/QueueDepth.h b/qpid/cpp/src/qpid/broker/QueueDepth.h
new file mode 100644
index 0000000000..d93acb2a7a
--- /dev/null
+++ b/qpid/cpp/src/qpid/broker/QueueDepth.h
@@ -0,0 +1,74 @@
+#ifndef QPID_BROKER_QUEUEDEPTH_H
+#define QPID_BROKER_QUEUEDEPTH_H
+
+/*
+ *
+ * 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 "qpid/broker/BrokerImportExport.h"
+#include "qpid/sys/IntegerTypes.h"
+#include <ostream>
+
+namespace qpid {
+namespace broker {
+
+/**
+ * Represents a queue depth in message count and/or aggregate message
+ * size.
+ */
+class QueueDepth
+{
+  public:
+    QPID_BROKER_EXTERN QueueDepth();
+    QPID_BROKER_EXTERN QueueDepth(uint32_t count, uint64_t size);
+    QPID_BROKER_EXTERN QueueDepth& operator+=(const QueueDepth&);
+    QPID_BROKER_EXTERN QueueDepth& operator-=(const QueueDepth&);
+    QPID_BROKER_EXTERN bool operator==(const QueueDepth&) const;
+    QPID_BROKER_EXTERN bool operator!=(const QueueDepth&) const;
+    QPID_BROKER_EXTERN bool operator<(const QueueDepth& other) const;
+    QPID_BROKER_EXTERN bool operator>(const QueueDepth& other) const;
+    QPID_BROKER_EXTERN operator bool() const;
+    QPID_BROKER_EXTERN bool hasCount() const;
+    QPID_BROKER_EXTERN uint32_t getCount() const;
+    QPID_BROKER_EXTERN void setCount(uint32_t);
+    QPID_BROKER_EXTERN bool hasSize() const;
+    QPID_BROKER_EXTERN uint64_t getSize() const;
+    QPID_BROKER_EXTERN void setSize(uint64_t);
+  friend QPID_BROKER_EXTERN QueueDepth operator-(const QueueDepth&, const QueueDepth&);
+  friend QPID_BROKER_EXTERN QueueDepth operator+(const QueueDepth&, const QueueDepth&);
+    template <typename T> struct Optional
+    {
+        T value;
+        bool valid;
+
+        Optional(T v) : value(v), valid(true) {}
+        Optional() : value(0), valid(false) {}
+    };
+  private:
+    Optional<uint32_t> count;
+    Optional<uint64_t> size;
+};
+
+QPID_BROKER_EXTERN QueueDepth operator-(const QueueDepth&, const QueueDepth&);
+QPID_BROKER_EXTERN QueueDepth operator+(const QueueDepth&, const QueueDepth&);
+std::ostream& operator<<(std::ostream&, const QueueDepth&);
+
+}} // namespace qpid::broker
+
+#endif  /*!QPID_BROKER_QUEUEDEPTH_H*/