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+/*
+ *
+ * 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/TimerWarnings.h"
+#include "qpid/sys/Monitor.h"
+#include "qpid/sys/Mutex.h"
+#include "qpid/sys/Thread.h"
+#include "qpid/sys/Runnable.h"
+#include "qpid/RefCounted.h"
+#include "qpid/CommonImportExport.h"
+#include <memory>
+#include <queue>
+
+#include <boost/intrusive_ptr.hpp>
+
+namespace qpid {
+namespace sys {
+
+class Timer;
+
+class TimerTask : public RefCounted {
+ friend class Timer;
+ friend class TimerTaskCallbackScope;
+ friend bool operator<(const boost::intrusive_ptr<TimerTask>&,
+ const boost::intrusive_ptr<TimerTask>&);
+
+ std::string name;
+ AbsTime sortTime;
+ Duration period;
+ AbsTime nextFireTime;
+ qpid::sys::Monitor stateMonitor;
+ enum {WAITING, CALLING, CANCELLED} state;
+
+ bool prepareToFire();
+ void finishFiring();
+ bool readyToFire() const;
+ void fireTask();
+
+ public:
+ /** Create a periodic TimerTask
+ *
+ * This TimerTask type will trigger after the specified duration
+ * and can also be retriggered again after the same duration
+ * by using setupNextFire() after it has been fired.
+ *
+ * Before it has been triggered you can use restart() to push off
+ * triggering the TimerTask by the specified duration.
+ */
+ QPID_COMMON_EXTERN TimerTask(Duration period, const std::string& name);
+
+ /** Create a TimerTask that fires at a given absolute time
+ *
+ * This is a once only Timer and cannot be restarted after it has fired.
+ */
+ QPID_COMMON_EXTERN TimerTask(AbsTime fireTime, const std::string& name);
+
+ QPID_COMMON_EXTERN virtual ~TimerTask();
+
+ /** Adjust a periodic TimerTask for next firing time
+ *
+ * Called after a TimerTask has been triggered - probably in the fire()
+ * callback function itself. This will set up a TimerTask for the next
+ * triggering.
+ *
+ * Note that the TimerTask will need to be added again to the Timer.
+ */
+ QPID_COMMON_EXTERN void setupNextFire();
+
+ /** Restart a TimerTask so to delay it being firing
+ *
+ * This can be called either with the TimerTask already added to a Timer
+ * or after the task has been triggered. It has the effect of delaying
+ * the task triggering by the initially specified duration.
+ */
+ QPID_COMMON_EXTERN void restart();
+
+ /** Cancel a TimerTask so that it is no longer triggered
+ *
+ * After cancelling the only thing you can do nothing further
+ * with a TimerTask.
+ *
+ * The Timer will delete the cancelled TimerTask.
+ */
+ QPID_COMMON_EXTERN void cancel();
+
+ std::string getName() const { return name; }
+
+ 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:
+ QPID_COMMON_EXTERN Timer();
+ QPID_COMMON_EXTERN virtual ~Timer();
+
+ /** Add an TimerTask to the Timer queue
+ *
+ * Once a TimerTask has been triggered by (calling its fire() function)
+ * the TimerTask is no longer on the Timer queue and needs to be added again.
+ *
+ * Note that TimerTasks must never be added more than once to a Timer
+ * and must never be added simultaneuosly to multiple Timers.
+ */
+ QPID_COMMON_EXTERN virtual void add(boost::intrusive_ptr<TimerTask> task);
+
+ /** Start the Timer
+ *
+ * This will start a new thread that runs the Timer and the fire callbacks.
+ */
+ QPID_COMMON_EXTERN virtual void start();
+
+ /** Stop the Timer
+ *
+ * This will stop the Timer and its thread.
+ */
+ QPID_COMMON_EXTERN virtual void stop();
+
+ protected:
+ QPID_COMMON_EXTERN virtual void fire(boost::intrusive_ptr<TimerTask> task);
+
+ // Allow derived classes to change the late/overran thresholds.
+ Duration late;
+ Duration overran;
+ Duration lateCancel;
+ TimerWarnings warn;
+};
+
+
+}}
+
+
+#endif