Boundaries.txt

Intro :

    We do not often control all softwares in our system,
    some times we use third party apps in our system 
    Other times we depend on our own team to create a componunants 
    or subsystems for us .

    In this chapter we will see the practice and techiniques to keep our software clean 

Using-Third Party Code :

    Providers of a third party app or a software they provide broad usabiiity 
    where as we may need only a particular portion of it this tension can causes a 
    problem in a boundaries of our system.

    Eg Consider java.utill.map it contains clear() to delete but if we want to use this users 
    may delete them with this clear method 

    Also if we want only sepcific types to be added it is also not possible as the map method 
    contains all the methods to change the data 

    If you use a boundary interface like Map, keep it inside the class, or close family
    of classes, where it is used. Avoid returning it from, or accepting it as an argument to,
    public APIs


Exploring and Learning boundaries :

    We must know completely about our third party apps before using them or else if we get an error in 
    our application we may not know which causes the error if it is from our code or if it is from 
    the third party api 

    so to avoid this confusions we may need to make a test cases on our third party aps to see
    if it passes all the tests that we needed to use 

    Jim Nukrik calls such a test "Learning test"

Learning Tests are better than free :

    Learing test are always better than to face them so we must make sure to make a learning test
    to learn about the third party app like wise it is also usefull if the third party app gets 
    updated as we can check to see if the test still passes or we can modify the test as per the 
    needs.

Using code that does not yet exists :

We can create our own code with that of third party api if the api does not have the 
fy=unctionality that we needed it to do 


Clean Boundaries :

A good software is the one that accomodates change 
so we must use make sure our code is more dependant from the third party api 
and also make sure that wa test the third party api so that it does not fails