1 files changed, 121 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/client/CompletionTracker.cpp b/qpid/cpp/src/qpid/client/CompletionTracker.cpp
new file mode 100644
index 0000000000..76ea9dec51
--- /dev/null
+++ b/qpid/cpp/src/qpid/client/CompletionTracker.cpp
@@ -0,0 +1,121 @@
+/*
+ *
+ * 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 "CompletionTracker.h"
+#include <algorithm>
+
+using qpid::client::CompletionTracker;
+using namespace qpid::framing;
+using namespace boost;
+
+namespace 
+{
+const std::string empty;
+}
+
+CompletionTracker::CompletionTracker() : closed(false) {}
+CompletionTracker::CompletionTracker(const SequenceNumber& m) : mark(m) {}
+
+void CompletionTracker::close()
+{   
+    sys::Mutex::ScopedLock l(lock);
+    closed=true;
+    while (!listeners.empty()) {
+        Record r(listeners.front());
+        {
+            sys::Mutex::ScopedUnlock u(lock);
+            r.completed();
+        }
+        listeners.pop_front();
+    }
+}
+
+
+void CompletionTracker::completed(const SequenceNumber& _mark)
+{   
+    sys::Mutex::ScopedLock l(lock);
+    mark = _mark;
+    while (!listeners.empty() && !(listeners.front().id > mark)) {
+        Record r(listeners.front());
+        listeners.pop_front();
+        {
+            sys::Mutex::ScopedUnlock u(lock);
+            r.completed();
+        }
+    }
+}
+
+void CompletionTracker::received(const SequenceNumber& id, const std::string& result)
+{
+    sys::Mutex::ScopedLock l(lock);
+    Listeners::iterator i = seek(id);
+    if (i != listeners.end() && i->id == id) {
+        i->received(result);
+        listeners.erase(i);
+    }
+}
+
+void CompletionTracker::listenForCompletion(const SequenceNumber& point, CompletionListener listener)
+{
+    if (!add(Record(point, listener))) {
+        listener();
+    }
+}
+
+void CompletionTracker::listenForResult(const SequenceNumber& point, ResultListener listener)
+{
+    if (!add(Record(point, listener))) {
+        listener(empty);
+    }
+}
+
+bool CompletionTracker::add(const Record& record)
+{
+    sys::Mutex::ScopedLock l(lock);
+    if (record.id <= mark || closed) {
+        return false;
+    } else {
+        //insert at the correct position
+        Listeners::iterator i = seek(record.id);
+        if (i == listeners.end()) i = listeners.begin();
+        listeners.insert(i, record);
+        return true;
+    }
+}
+
+CompletionTracker::Listeners::iterator CompletionTracker::seek(const framing::SequenceNumber& point)
+{
+    Listeners::iterator i = listeners.begin(); 
+    while (i != listeners.end() && i->id < point) i++;
+    return i;
+}
+
+
+void CompletionTracker::Record::completed() 
+{ 
+    if (f)     f(); 
+    else if(g) g(empty);//won't get a result if command is now complete
+}
+
+void CompletionTracker::Record::received(const std::string& result) 
+{ 
+    if (g) g(result);
+}