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Command and Adapter Pattern

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Jonathan Simon
Jonathan Simon

This is Class 4 on a 6 week course I taught on Software Design Patterns. This course goes over Command and Adapter pattern. Class based on "Head First Design Patterns."

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Design Patterns 05/28/10 Week 4: Command and Adapter Jonathan Simon [email_address]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Remote Control ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
First Thoughts ,[object Object],[object Object],[object Object],05/28/10
What Varies? What stays the same? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
The Vendor Classes (pg 194) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
One possible solution… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Problems: The Remote needs to be aware of all the details about turning a device on (or off). If device On/Off mechanism changes, the Remote code will need to be changed. If a new device is added, this code would need to be changed. Is this Open for Extension?? Also…what about undo????
Separation of Concerns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
The Command Pattern ,[object Object],[object Object],[object Object],05/28/10
Command Interface (pg203) ,[object Object],[object Object],[object Object],[object Object],05/28/10
LightOnCommand (pg203) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 The command is composed of a vendor class. Constructor takes the vendor class as parameter. Here the command delegates execution to the vendor class. Note : This is a simple example..there could be more steps.
SimpleRemoteControl (pg204) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 This version of the remote just has one slot. setCommand assigns a Command to a slot. Tells the command to execute. Note that any command would work here. The remote doesn’t know anything about the specific vendor class.
RemoteControlTest (pg204) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Create two vendor classes. Create two commands based on these vendor classes. Set the command and press button
The Command Pattern ,[object Object],[object Object],[object Object],[object Object],05/28/10
Definitions (see Diagram on pg 207) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Lab Part I ,[object Object],[object Object],05/28/10
Lab Part II ,[object Object],[object Object],05/28/10
Lab Part III (Design Challenge!) ,[object Object],[object Object],[object Object],05/28/10
Lab Part I Answer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab Part I Answer (cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab Part II Answer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab Part III (Answer) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab Part III (Answer) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],We don’t want on(), off(), and undo() to be overridden.
Lab Part III ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab Part III ,[object Object],[object Object],[object Object],[object Object],05/28/10
History of Undo Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
History of Undo Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Simple Logging ,[object Object],[object Object],05/28/10
Simple Logging ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Advantage: We can add logging in the Invoker. No change is needed in any of the Command or Receiver objects!
Complex Logging ,[object Object],[object Object],[object Object],05/28/10
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Complex Logging 05/28/10 Once again, we can make these changes in one place (the Invoker)
Case Study: Command Management 05/28/10 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Question ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Possible Solutions ,[object Object],[object Object],[object Object],05/28/10
Disadvantages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Command Management Framework ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Command Manager 05/28/10 The Commands property contains a list of all possible Commands. CommandsList contains a List object internally for storing each possible Command. It also has a reference to CommandManager.
Command Object ExecuteHandler = delegate that represents the logic for executing the actual Command logic. Triggered when the command is executed. Gets associated with OnExecute event. UpdateHandler = delegate that represents the logic for executing the logic to update the state of a command. (For example, Edit  Copy should be enabled if text has been selected). Associated with OnUpdate event.
Command Constructor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Associates events to delegates
Command: Execute() and ProcessUpdates() ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Will call the function passed in as ExecuteHandler Will call the function passed in as UpdateHandler How is this Command.Execute() different than the RemoteControl example??
Re-look at EditCopy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Will discuss later
So far.. 05/28/10 Command #1 Tag = “Edit Copy” OnExecute = OnCopy OnUpdate = UpdateCopyCommand Command #2 Tag = “File Open” OnExecute = OnFileOpen OnUpdate = null
Associating UI Elements to a Command ,[object Object],[object Object],[object Object],[object Object],05/28/10 What object contains the CommandInstances property??
CommandInstances 05/28/10 Contain a list of all UI Elements associated with a Command
So far.. 05/28/10 Command #1 Tag = “Edit Copy” OnExecute = OnCopy OnUpdate = UpdateCopyCommand Two items: mnuEditCopy tlbMain.Buttons[4] All we have done so far is store information…
How do we enable a Command??? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Are you enabled???
Command.ProcessUpdates() ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 If we do need to enable (or disable) the Command, who do we need to tell to “go enable/disable yourself?”
Command.Enabled Property ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Command.Enabled (Psuedo-Code) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Question: Any problems with this code???
Command.Enabled (Psuedo-Code) ,[object Object],[object Object],[object Object],[object Object],05/28/10
CommandExecutor 05/28/10 Enable() is abstract. Toolbar and Menu subclasses must define how Enable needs to work.
CommandExecutor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Command.Enabled (Real Code) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CommandManager actually contains all possible CommandExecutors. These are registered during start-up for each possible type of UI element. (CommandManager constructor)
CommandExecutor - Execution ,[object Object],[object Object],05/28/10
MenuCommandExecutor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Called when we added UI element to Command
Example (Again) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Confused? ,[object Object],[object Object],05/28/10
Distributed Command Pattern ,[object Object],[object Object],05/28/10
Adapter Pattern ,[object Object],[object Object],05/28/10
Real Life Examples ,[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Drawback ,[object Object],[object Object],05/28/10
Example 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10 Generated Code!!!
Example 1 ,[object Object],[object Object],[object Object],[object Object],05/28/10 Imagine these lines of code were in different parts of the system. What happens when SaveCustomer gets re-generated?
Example 1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Lab ,[object Object],[object Object],05/28/10
Answer: Two Way Adapter ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Answer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Answer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10
Answer: Reworked Code ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/28/10

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Command and Adapter Pattern

  • 1. Design Patterns 05/28/10 Week 4: Command and Adapter Jonathan Simon [email_address]
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  • 39. Command Manager 05/28/10 The Commands property contains a list of all possible Commands. CommandsList contains a List object internally for storing each possible Command. It also has a reference to CommandManager.
  • 40. Command Object ExecuteHandler = delegate that represents the logic for executing the actual Command logic. Triggered when the command is executed. Gets associated with OnExecute event. UpdateHandler = delegate that represents the logic for executing the logic to update the state of a command. (For example, Edit  Copy should be enabled if text has been selected). Associated with OnUpdate event.
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  • 44. So far.. 05/28/10 Command #1 Tag = “Edit Copy” OnExecute = OnCopy OnUpdate = UpdateCopyCommand Command #2 Tag = “File Open” OnExecute = OnFileOpen OnUpdate = null
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  • 46. CommandInstances 05/28/10 Contain a list of all UI Elements associated with a Command
  • 47. So far.. 05/28/10 Command #1 Tag = “Edit Copy” OnExecute = OnCopy OnUpdate = UpdateCopyCommand Two items: mnuEditCopy tlbMain.Buttons[4] All we have done so far is store information…
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  • 53. CommandExecutor 05/28/10 Enable() is abstract. Toolbar and Menu subclasses must define how Enable needs to work.
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Editor's Notes

  1. 13 November 2008
  2. Note: In the RemoteControl example, each Command wrapped a Receiver object and told the Reciever to do something. In this example, the Command is given the logic externally. 13 November 2008
  3. Possible Side Discussion on Factory? 13 November 2008