1 | // |
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2 | // TaskManager.h |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/include/Poco/TaskManager.h#1 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Tasks |
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8 | // Module: Tasks |
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9 | // |
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10 | // Definition of the TaskManager class. |
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11 | // |
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12 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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13 | // and Contributors. |
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14 | // |
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15 | // Permission is hereby granted, free of charge, to any person or organization |
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16 | // obtaining a copy of the software and accompanying documentation covered by |
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17 | // this license (the "Software") to use, reproduce, display, distribute, |
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18 | // execute, and transmit the Software, and to prepare derivative works of the |
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19 | // Software, and to permit third-parties to whom the Software is furnished to |
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20 | // do so, all subject to the following: |
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21 | // |
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22 | // The copyright notices in the Software and this entire statement, including |
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23 | // the above license grant, this restriction and the following disclaimer, |
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24 | // must be included in all copies of the Software, in whole or in part, and |
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25 | // all derivative works of the Software, unless such copies or derivative |
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26 | // works are solely in the form of machine-executable object code generated by |
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27 | // a source language processor. |
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28 | // |
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29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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35 | // DEALINGS IN THE SOFTWARE. |
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36 | // |
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37 | |
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38 | |
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39 | #ifndef Foundation_TaskManager_INCLUDED |
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40 | #define Foundation_TaskManager_INCLUDED |
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41 | |
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42 | |
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43 | #include "Poco/Foundation.h" |
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44 | #include "Poco/Mutex.h" |
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45 | #include "Poco/Task.h" |
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46 | #include "Poco/AutoPtr.h" |
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47 | #include "Poco/NotificationCenter.h" |
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48 | #include "Poco/Timestamp.h" |
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49 | #include <list> |
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50 | |
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51 | |
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52 | namespace Poco { |
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53 | |
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54 | |
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55 | class Notification; |
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56 | class ThreadPool; |
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57 | class Exception; |
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58 | |
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59 | |
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60 | class Foundation_API TaskManager |
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61 | /// The TaskManager manages a collection of tasks |
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62 | /// and monitors their lifetime. |
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63 | /// |
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64 | /// A TaskManager has a built-in NotificationCenter that |
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65 | /// is used to send out notifications on task progress |
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66 | /// and task states. See the TaskNotification class and its |
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67 | /// subclasses for the various events that result in a notification. |
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68 | /// To keep the number of notifications small, a TaskProgressNotification |
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69 | /// will only be sent out once in 100 milliseconds. |
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70 | { |
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71 | public: |
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72 | typedef AutoPtr<Task> TaskPtr; |
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73 | typedef std::list<TaskPtr> TaskList; |
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74 | |
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75 | TaskManager(); |
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76 | /// Creates the TaskManager, using the |
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77 | /// default ThreadPool. |
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78 | |
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79 | TaskManager(ThreadPool& pool); |
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80 | /// Creates the TaskManager, using the |
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81 | /// given ThreadPool. |
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82 | |
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83 | ~TaskManager(); |
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84 | /// Destroys the TaskManager. |
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85 | |
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86 | void start(Task* pTask); |
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87 | /// Starts the given task in a thread obtained |
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88 | /// from the thread pool. |
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89 | /// |
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90 | /// The TaskManager takes ownership of the Task object |
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91 | /// and deletes it when it it finished. |
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92 | |
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93 | void cancelAll(); |
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94 | /// Requests cancellation of all tasks. |
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95 | |
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96 | void joinAll(); |
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97 | /// Waits for the completion of all the threads |
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98 | /// in the TaskManager's thread pool. |
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99 | |
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100 | TaskList taskList() const; |
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101 | /// Returns a copy of the internal task list. |
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102 | |
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103 | int count() const; |
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104 | /// Returns the number of tasks in the internal task list. |
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105 | |
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106 | void addObserver(const AbstractObserver& observer); |
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107 | /// Registers an observer with the NotificationCenter. |
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108 | /// Usage: |
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109 | /// Observer<MyClass, MyNotification> obs(*this, &MyClass::handleNotification); |
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110 | /// notificationCenter.addObserver(obs); |
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111 | |
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112 | void removeObserver(const AbstractObserver& observer); |
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113 | /// Unregisters an observer with the NotificationCenter. |
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114 | |
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115 | static const int MIN_PROGRESS_NOTIFICATION_INTERVAL; |
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116 | |
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117 | protected: |
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118 | void postNotification(Notification* pNf); |
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119 | /// Posts a notification to the task manager's |
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120 | /// notification center. |
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121 | |
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122 | void taskStarted(Task* pTask); |
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123 | void taskProgress(Task* pTask, float progress); |
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124 | void taskCancelled(Task* pTask); |
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125 | void taskFinished(Task* pTask); |
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126 | void taskFailed(Task* pTask, const Exception& exc); |
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127 | |
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128 | private: |
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129 | ThreadPool& _threadPool; |
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130 | TaskList _taskList; |
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131 | Timestamp _lastProgressNotification; |
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132 | NotificationCenter _nc; |
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133 | mutable FastMutex _mutex; |
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134 | |
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135 | friend class Task; |
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136 | }; |
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137 | |
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138 | |
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139 | // |
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140 | // inlines |
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141 | // |
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142 | inline int TaskManager::count() const |
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143 | { |
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144 | FastMutex::ScopedLock lock(_mutex); |
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145 | |
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146 | return (int) _taskList.size(); |
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147 | } |
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148 | |
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149 | |
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150 | } // namespace Poco |
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151 | |
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152 | |
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153 | #endif // Foundation_TaskManager_INCLUDED |
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