JAVA Spring IOC Module

8/11/2019 JAVA Spring IOC Module

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Apex T. G. India Pvt. Ltd

Inversion of ControlSpring Framework
http://apextgi.in/http://apextgi.in/


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IOC Dependency Injection is the act of injecting

dependencies into an Object.

Inversion of Contro is the genera stye of !sing

dependency Injection to "ire together appication

ayers.

#ence $pring is an Inversion of Contro container.

That is% it is a container that handes Dependency

Injection for yo!.


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IOC An Inversion of Contro &IoC' Container is !tiities

that provide a consistent &and si(pe)' API to

(any other technoogies &*D+C% O,-%AOP%

Decarative Transactions% etc'.

-ini(ie dependencies on $pring.

-ini(ie dependencies bet"een a ayers of an

appication.


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IOC A appication code sho!d be testabe% "itho!t an

appication server or other co(pex environ(ent.

/!y factor the APIs &the 02 case sho!d be

acco(pished in one ine of code)'.

A appication code sho!d be testabe% "itho!t an

appication server or other co(pex environ(ent.


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IOC /!y factor the APIs &the 02 case sho!d be

acco(pished in one ine of code)'.

IOC is a abo!t Object dependencies. Traditiona 3P!3 approach4

Direct instantiation As5ing a /actory for an i(pe(entation Loo5ing !p a service via *6DI.


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IOC 7 P!sh Approach 74 $o(ething o!tside of the

Object 3p!shes3 its dependencies into it. The

Object has no 5no"edge of ho" it gets its

dependencies% it j!st ass!(es they are there.

The 3P!sh3 approach is caed 3Dependency

Injection3.

There is t"o reason to !se dependency injection

1st Loose Co!ping and 8nd is Testabity.


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Loose Co!ping Loose Co!ping is i(proved beca!se it isn9t hard:

code dependencies bet"een ayers and (od!es.

Instead It con;g!re the(&$pring +ean object'

o!tside of the code. This (a5es it easy to s"ap in

a ne" i(pe(entation of a service% or brea5 o< a

(od!e and re!se it ese"here.


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Testabity Testabiity is i(proved beca!se yo!r Objects don9t

5no" or care "hat environ(ent they9re in as ong

as so(eone injects their dependencies. #ence yo!

can depoy Objects into a test environ(ent and

inject -oc5 Objects for their dependencies "ith

ease.


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IOC I(pe(entation create a con;g!ration ;e in "hich de;ne concrete

3beans3 for the interfaces bet"een ayers.

Then "ire the appication together by stating

"hich beans are dependent on each other.

6o"% instantiate a $pring object by !sing IOC

container +ean/actory and AppicationContext. It is

a type of bean factory that "i instantiate a other

beans and hande dependency injection.


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JAVA Spring IOC Module

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