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Analysis

Overview

The aim of this task is to identify irregular uses of Properties Library that could be either frequent or hard to find. An example of irregular use is :

public RwProp<Integer> fish() {

return getBean().makeValueProp("fish", Integer.class, complextMethodToComputeFish());

} because the third argument must be a constant.

Task requirements

1. Write a list with irregular uses - at least 3
   
2. Add some checks or asserts to protect from irregular uses
   
3. Make tests, which identify irregular uses.
   

Task result

The result of this task should be source code

Implementation idea

Prolib is a complex library. It is easy to use it irregular . It is hard to find the irregular uses, so it must have lots of conversations between teams. There is some ways to protect from irregular uses :

1. using a compilator
   

2. using exceptions
   

Related

PRO_LIB_CORE_COMMONS_R0

How to demo

Explain the misuses to the team

Design

• Irregular pro lib uses:
  • create method of resource property should not be dependent on any property except for final properties and resource properties.
  • value properties that are initialized at their invocation - for example:

        public RwProp<String> text() {
    	return getBean().makeValueProp("text", String.class, "this is a string.");
        }
    

    • should be initialized with ONLY the following:
      • constant primitive types or literals.
      • public static final things.
    • should not set their value by a complex code invocation:

         public RwProp<Integer> fish() {
             return getBean().makeValueProp("fish", Integer.class, complextMethodToComputeFish());
         }
      

    • should not create new objects.

          public RwProp<Dummy> dummy() {
      	return getBean().makeValueProp("dummy", Dummy.class, new Dummy());
          }
      
      

• properties of objects that are alike properties of other objects should create the former instead of returning them directly:

        class Dummy extends BaseProObject{
  		public RwProp<String> text() {
  			return getBean().makeValueProp("text", String.class, new String("this is a string."));
  		}
  	}
  	
  	class DummyDependent extends BaseProObject{
  		
  		public DummyDependent(Dummy dummy) {
  			dummy().set(dummy);
  		}
  		
  		public RwProp<Dummy> dummy() {
  			return getBean().makeValueProp("dummy", Dummy.class);
  		}
  		
                  //THIS SHOULD NOT BE POSSIBLE
  		public RwProp<String> textOfDummy() {
  			return dummy().get().text();
  		}
  		
  	}
  

• Misuse detection shall be done through checks and exception throwing.
  • create method of resource property should not be dependent on any property except for final properties - the check should be made on ResourceProperty creation. It appears that the code is commented. It should be un-commented and things should be fixed and refactored.
  • value properties that are initialized at their invocation - things should be checked and exception thrown:
    • should check that the value is the same every time the property is got.
    • should check that on initializing of the property, nothing else is read.
  • properties of objects that are alike properties of other objects should create the former instead of returning them directly - should check in ProObject's methods that return properties that they construct new ones instead of reusing others. The check should be done at creation.
• A unit test for the 3 types of irregular use will be written.

Implementation

• done according to design - one more improper use imeplemented since it is part of another task but it is still an improper usage. See unit test for more information.
• a unit test for the misuse detection - PropertyMisuseDetection
• chages:
  • 1209
  • 1210
  • 1236
  • 1246

Testing

Comments

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