{"id":8701,"date":"2022-03-22T03:49:40","date_gmt":"2022-03-22T03:49:40","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=8701"},"modified":"2023-08-23T12:57:35","modified_gmt":"2023-08-23T07:27:35","slug":"fsm-lecture-83-exercise-008-implementation-active-object-in-clock_alarm-system","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/fsm-lecture-83-exercise-008-implementation-active-object-in-clock_alarm-system\/","title":{"rendered":"FSM Lecture 83| Exercise-008: Implementation part 2"},"content":{"rendered":"
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 <\/p>\n<\/div>\n

\n

Exercise-008: Implementation part 2<\/span><\/strong><\/h1>\n
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 <\/p>\n

<\/div>\n

 <\/p>\n<\/div>\n<\/div>\n<\/div>\n

Now, select Clock_Alarm:QHsm and convert this class into an active object. You have to go to the right-hand side and change the superclass from QHsm to QActive. That’s the first change you have to make.<\/span><\/p>\n

\"Figure
Figure 1. Convert the Class into an Active object<\/span><\/figcaption><\/figure>\n

 <\/p>\n

After that, we have got another active object called Button. Let’s create that. Click on the package name AOs, Right-click, Add a class. We will call this a Button and select superclass as QActive, as shown in Figure 2. Now there are two active objects. <\/span><\/p>\n

\"Figure
Figure 2. Creating a class Button: QActive<\/span><\/figcaption><\/figure>\n

 <\/p>\n

And we should also create one component class for this Alarm region.<\/span> <\/span><\/p>\n

\"Figure
Figure 3. Exercise using the active objects approach<\/span><\/figcaption><\/figure>\n

 <\/p>\n

Let’s create one class. Select the package name AOs\u2192 right-click\u2192  Add class\u2192  I’ll call this Alarm. Its superclass could be QActive, QHsm, or it could be anything. I will select QHsm for this Alarm class. <\/span><\/p>\n

\"Figure
Figure 4. Creating a class Alarm: QHsm<\/span><\/figcaption><\/figure>\n

 <\/p>\n

And we have to use the composition of classes. Clock_Alarm is a container of this Alarm class. An alarm is a component class. Whenever Clock_Alarm comes into existence, the memory for Alarm also should come into existence. That’s why you must create an object of Alarm class inside this Clock_Alarm. <\/span><\/p>\n

That’s why now select the Clock_Alarm class and add attribute. Attribute name is \u2018alarm’, type is ‘Alarm’, and it is ‘private’.<\/span> (Figure 5)<\/span><\/span><\/p>\n

\"Exercise-008:
Figure 5. Creating an object of Alarm class inside the Clock_Alarm class<\/span><\/figcaption><\/figure>\n

 <\/p>\n

For the Alarm class, let’s define a constructor and other things later.<\/span><\/p>\n

Now, let’s create some <\/span>opec<\/span> pointers.<\/span> <\/span><\/span><\/p>\n

\/*.${HSMs::Clock_Alarm} ....................................................*\/<\/span>\r\n\r\ntypedef struct <\/span>Clock_Alarm<\/span> {\r\n\/* protected: *\/<\/span>\r\nQActive super;\r\n\r\n\/* private: *\/<\/span>\r\nuint32_t<\/span> temp_time;\r\nuint8_t<\/span> time_mode;\r\nuint8_t<\/span> temp_format;\r\nuint8_t<\/span> temp_digit;\r\nuint8_t<\/span> curr_setting;\r\nAlarm alarm;\r\n\r\n\r\n\/* private state histories *\/<\/span>\r\nQStateHandler hist_Clock;\r\n} Clock_Alarm<\/span>;<\/pre>\n
When you generate the code, your main class, the Clock_Alarm ack class, looks like this. Now, it is derived from QActive. That’s how this class becomes an active object class. And this QActive provides all the Event queues, methods of context, etc. That’s why to post-event to the Event queue such things you need now a pointer to this QActive super class.<\/span><\/p>\n
 So, just like what you did previously. In the previous exercise, it was QHsm. Now it is QActive. That’s why now we have to create a pointer to this superclass, and you have to make that public.<\/span><\/p>\n
 <\/p>\n
Let’s click on the AOs package name, and we will add a free attribute. Select Add Attribute. I’ll name it AO_ClockAlarm. Type is QActive *const; visibility is  ‘global.’  AO_ClockAlarm is an opec pointer to access this Clock_Alarm active object. <\/span><\/p>\n
\"active
Figure 6. Creating a pointer<\/span><\/figcaption><\/figure>\n
 <\/p>\n
Let’s create another opec pointer for the button. Select the package AOs\u2192 Add attribute\u2192 Name is  AO_Button; the type is QActive *const;  Visibility is global.<\/span><\/p>\n
\"active
Figure 7. Creating an another pointer for Button<\/span><\/figcaption><\/figure>\n
 <\/p>\n
What is an initializer for this? Select the Clock_Alarm, add attribute, the initializer will be <\/span>= &Clock_Alarm_obj.super<\/b>. And for the AO button, the initializer is the same <\/span> = &Button_obj.super<\/b>.<\/span><\/span><\/p>\n
\"active
Figure 8. Initializer for Both Clock_alarm<\/span><\/figcaption><\/figure>\n
 <\/p>\n
We have not created any object for the Button. Let’s create an object. Select Button\u2192 right-click\u2192  Add attribute. I’ll name it as ‘obj,’ type is Button, visibility is ‘private,’  it is a static variable, let’s select ‘static’ here. <\/span><\/p>\n
\"active
Figure 9. Creating an object for Button<\/span><\/figcaption><\/figure>\n
 <\/p>\n
In the following article, we will create the constructors for the button active object and the Alarm component. <\/span><\/p>\n
 <\/p>\n
FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n
Click here:<\/span> <\/span><\/span>https:\/\/fastbitlab.com\/course1<\/span><\/a><\/span><\/p>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
  Exercise-008: Implementation part 2     Now, select Clock_Alarm:QHsm and convert this class into an active object. You have to go to the right-hand side and change the superclass from QHsm to QActive. That’s the first change you have to make.   After that, we have got another active object called Button. Let’s create 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Active Object in Clock_Alarm System | FSM<\/title>\n<meta name=\"description\" content=\"Learn how to transform the Clock_Alarm class into an active object in this implementation guide.Understand the process of changing superclass\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fastbitlab.com\/blog\/fsm-lecture-83-exercise-008-implementation-active-object-in-clock_alarm-system\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Implementing Active Object in Clock_Alarm System | FSM\" \/>\n<meta property=\"og:description\" content=\"Learn how to transform the Clock_Alarm class into an active object in this implementation guide.Understand the process of changing superclass\" \/>\n<meta property=\"og:url\" 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