Created new Timer code in qpid::sys

- Necessary for a timer accessible to the client code
- The interface is slightly different from the existing
  Timer code in an attempt to fix some issues with it


git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@734216 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 93 insertions, 0 deletions

diff --git a/cpp/src/qpid/sys/Timer.h b/cpp/src/qpid/sys/Timer.h
new file mode 100644
index 0000000000..2561e41034
--- /dev/null
+++ b/cpp/src/qpid/sys/Timer.h
@@ -0,0 +1,93 @@
+/*
+ *
+ * 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.
+ *
+ */
+#ifndef sys_Timer
+#define sys_Timer
+
+#include "qpid/sys/Monitor.h"
+#include "qpid/sys/Thread.h"
+#include "qpid/sys/Runnable.h"
+#include "qpid/RefCounted.h"
+
+#include <memory>
+#include <queue>
+
+#include <boost/intrusive_ptr.hpp>
+
+namespace qpid {
+namespace sys {
+
+class Timer;
+
+class TimerTask : public RefCounted {
+    friend class Timer;
+    friend bool operator<(const boost::intrusive_ptr<TimerTask>&,
+                const boost::intrusive_ptr<TimerTask>&);
+
+    Duration period;
+    AbsTime nextFireTime;
+    volatile bool cancelled;
+
+    bool readyToFire() const;
+    void fireTask();
+
+public:
+    TimerTask(Duration period);
+    TimerTask(AbsTime fireTime);
+    virtual ~TimerTask();
+
+    void setupNextFire();
+    void restart();
+    void delayTill(AbsTime fireTime);
+    void cancel();
+    bool isCancelled() const;
+
+protected:
+    // Must be overridden with callback
+    virtual void fire() = 0;
+};
+
+// For the priority_queue order
+bool operator<(const boost::intrusive_ptr<TimerTask>& a,
+                const boost::intrusive_ptr<TimerTask>& b);
+
+class Timer : private Runnable {
+    qpid::sys::Monitor monitor;            
+    std::priority_queue<boost::intrusive_ptr<TimerTask> > tasks;
+    qpid::sys::Thread runner;
+    bool active;
+
+    // Runnable interface
+    void run();
+
+public:
+    Timer();
+    ~Timer();
+
+    void add(boost::intrusive_ptr<TimerTask> task);
+    void start();
+    void stop();
+};
+
+
+}}
+
+
+#endif