103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
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#ifndef __TaskManager_h
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#define __TaskManager_h
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#include <ctime>
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#include <list>
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namespace b2bua
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{
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/**
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* The TaskManager keeps a record of all recurring tasks, and
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* also tasks scheduled to take place at a specified time.
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* It provides an efficient way of giving CPU time to each task.
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* TaskManager is expected to be used with tasks that do not block
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* or run for extended periods of time.
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* TaskManager runs all tasks in a single thread.
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*/
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class TaskManager {
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public:
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typedef enum TaskResult {
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TaskComplete, // the task doesn't need to run again
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TaskNotComplete, // the task would like to run again shortly
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TaskIndefinite // the task can be run again, but doesn't
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// object if the TaskManager stops
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};
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class RecurringTask {
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public:
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virtual ~RecurringTask() {};
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virtual TaskResult doTaskProcessing() = 0;
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virtual void stop() = 0;
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};
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class ScheduledTask {
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public:
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virtual ~ScheduledTask() {};
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virtual void doTaskSchedule() = 0;
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};
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TaskManager();
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/**
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* Start the task manager - blocks until complete.
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* Exits when all recurring tasks exit and no scheduled tasks remain.
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*/
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void start();
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void addRecurringTask(RecurringTask *t);
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void scheduleTask(ScheduledTask *t, time_t& executionTime);
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void stop();
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protected:
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std::list<RecurringTask *> recurringTasks;
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std::list<ScheduledTask *> scheduleTasks;
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};
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}
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#endif
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/* ====================================================================
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*
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* Copyright 2012 Daniel Pocock. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. Neither the name of the author(s) nor the names of any contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* ====================================================================
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*
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*
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*/
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