Adapter Design Pattern
Videos
| Section | Video Links |
|---|---|
| Adapter Overview |    |
| Adapter Use Case | |
| Python isinstance() Function | |
| Python time Module | |
Book
Overview
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Terminology
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Adapter UML Diagram
Source Code
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Output
python ./adapter/adapter_concept.py method A method B method A method B
Example Use Case
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Example UML Diagram
Output
python ./adapter/client.py Company A is busy, trying company B Company B is busy, trying company A Company A is busy, trying company B Company B is busy, trying company A Company A building Cube id:2968196317136, 2x3x7 Company A is busy, trying company B Company B building Cube id:2968196317136, 8x2x8 Company A building Cube id:2968196317040, 4x6x4 Company A is busy, trying company B Company B is busy, trying company A Company A building Cube id:2968196317136, 5x4x8 Company A is busy, trying company B Company B building Cube id:2968196317136, 2x2x9 5 cubes have been manufactured
New Coding Concepts
Python isinstance() Function
Syntax: isinstance(object, type)
Returns: True or False
You can use the inbuilt function isinstance() to conditionally check the type of an object.
>>> isinstance(1,int) True >>> isinstance(1,bool) False >>> isinstance(True,bool) True >>> isinstance("abc",str) True >>> isinstance("abc",(int,list,dict,tuple,set)) False >>> isinstance("abc",(int,list,dict,tuple,set,str)) True
You can also test your custom classes.
class my_class: "nothing to see here" CLASS_A = my_class() print(type(CLASS_A)) print(isinstance(CLASS_A, bool)) print(isinstance(CLASS_A, my_class))
Outputs
<class '__main__.my_class'>
False
True
You can use it in logical statements as I do in /adapter/adapter_concept.py.
Python time Module
The time module provides time related functions, most notably in my case, the current epoch (ticks) since January 1, 1970, 00:00:00 (UTC) .
The time module provides many options that are outlined in more detail at https://docs.python.org/3/library/time.html
In /adapter/cube_a.py, I check the time.time() at various intervals to compare how long a task took.
now = int(time.time()) if now > int(CubeA.last_time + 1): CubeA.last_time = now return True
I also use the time module to sleep for a second between loops to simulate a 1 second delay. See /adapter/client.py
# wait some time before manufacturing a new cube time.sleep(1)
When executing /adapter/cube_a.py you will notice that the process will run for about 10 seconds outputting the gradual progress of the construction of each cube.
Summary
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