aop asjectj

8/18/2019 Aop Asjectj

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Aspect OrientedProgramingAspectJ & Spring AOP

present by toan.do


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Agenda• Aspect Orient Programing

•

AspectJ

• Java Dynamic Programing• Bytecode

• Class Loader

•

Java Refection• Dynamic Proy

• Spring AOP• !"L Base

• AspectJ Annotation

• AOP #amespace

• AOP Alliance


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Cross$c%tting concern

. Concern

. Cross$c%tting concern

. A concern is a specic re'%irement or consideration t(at m%st addressed in order to satis)y t(e overall system goal.

. Cross-cutting concerns are aspects o) a program t(at a*ectconcerns

. A system$+ide concerns t(at span m%ltiple mod%les are called

ting concerns.


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Cross$c%tting concern


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"od%lari,ation


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Cross$c%tting problems

. Code tangling

. Code scattering

Poor traceability- lo+er prod%ctivity- lo+er code re%se- poor '%ality- aevol%tion.


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Aspect oriented programing

. Decomposite core concerns +it( cross$c%tting c

. Red%ce code tangling and code scattering


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Aspect oriented programing


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•

Dynamic Java Proy• (e bytecode manip%lation library AS"

• JBoss Javassist

• AspectJ

• Spring AOP/proies

• Java 00 interceptors

(ttp1//+++.2avacodegee3s.com/4566/57/practical$introd%ctcode.(tml

http://asm.ow2.org/http://asm.ow2.org/


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AOP Lang%age

. AOP lang%age specication. Constr%cts

. Synta

. AOP lang%age implementation

. 8eri)y code

. ranslate t(e code to eec%table )orm


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AOP Lang%age


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Benets

. Cleaner responsibilities o) t(e individ%al mod%le

. 9ig(er mod%lari,ation

. 0asier system evol%tion

. Late binding o) design decisions

. "ore code re%se

. Red%ced costs o) )eat%re implementation


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AspectJ

. 0tension Java programing lang%age

. Lang%age specication & Lang%age implementa

. AspectJ Complier


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AOP terminologies

. Join point

. Aspect

. Point C%t

. Advice

. :ntrod%ction


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Join point

A 2oin point is +ell$dened point in t(e application at +(iccan insert additional logic

. "et(od

. Constr%ctor

. Property


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Advice

(e code t(at is eec%ted at a partic%lar 2oin poinadvice

. Be)ore

. A)ter

. A)ter Ret%rning

. A)ter (ro+

. Aro%nd


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Point C%tPoint c%t is a collection o) 2oin points t(at +e %se to dene +(en advice s(oeec%ted.

. "et(od eec%tion

. "et(od call

. Constr%ctor eec%tion

. Constr%ctor call

. Class initiali,ation

. ;ield +rite access

. ;ield read access

. 0ception (ander eec%tion

. Ob2ect initiali,ation

. Ob2ect pre$initiali,ation

. Advice eec%tion


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Aspect

An aspect is t(e combination o) advices and point


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Re)erences

•

(ttp1//eclipse.org/aspect2/• AspectJ in Action

• (ttp1//+++.r%ntime$verication.org/co%rse57/lect%re6/'%ic3.pd)


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0ample aspect in AspectJAspectJ Compiler

Concepts 1 aspect- point c%t- advice


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Point C%t

. (at is a +eaving r%les t(at is collected 2oin poin


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Point C%t

. denotes any s%bclass or s%binter)ace o) a give. Operators ? ecepting t(ose specied t(ings

@@ matc(ing eit(er o) t(e pointc%ts

&& matc(ing bot( t(e pointc%ts.


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ype Signat%re

Acco%nt

ype o) name Acco%nt.

=Acco%nt

ypes +it( a name ending +it( Acco%nt s%c( as SavingsAccoC(ec3ingAcco%nt.

2ava.=.Date ype

Date in any o) t(e direct s%bpac3ages o) t(e 2ava pac3age- s 2ava.%til.Date and 2ava.s'l.Date.


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Signat%re "et(odp%blic void Collection.clear

(e met(od clear in t(e Collection class t(at (as p%blic access- ret%rns void- and ta3es

p%blic void Acco%nt.debitfoat t(ro+s :ns%cientBalance0ception

(e p%blic met(od debit in t(e Acco%nt class t(at ret%rns void- ta3es a single foat arg%declares

t(at it can t(ro+ :ns%cientBalance0ception.

p%blic void Acco%nt.set==

All p%blic met(ods in t(e Acco%nt class +it( a name starting +it( set and ta3ing a single any type.

p%blic void Acco%nt.=

All p%blic met(ods in t(e Acco%nt class t(at ret%rn void and ta3e no arg%ments.

p%blic = Acco%nt.=

All p%blic met(ods in t(e Acco%nt class t(at ta3e no arg%ments and ret%rn any type.


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Signat%re "et(odp%blic = Acco%nt.=..

All p%blic met(ods in t(e Acco%nt class ta3ing any n%mber and type o) arg%ments.

Acco%nt.=..

All met(ods in t(e Acco%nt class. (is +ill even matc( met(ods +it( private access.

?p%blic = Acco%nt.=..

All met(ods +it( nonp%blic access in t(e Acco%nt class. (is +ill matc( t(e met(ods +de)a%lt- and protected access.

p%blic static void est.mainStringE args

(e static main met(od o) a est class +it( p%blic access.

Acco%nt>.=..

All met(ods in t(e Acco%nt class or its s%bclasses. (is +ill matc( any ne+ met(od intrAcco%ntFs s%bclasses.


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Signat%re Constr%ctorp%blic Acco%nt.ne+

A p%blic constr%ctor o) t(e Acco%nt class ta3ing no arg%ments.

p%blic Acco%nt.ne+int

A p%blic constr%ctor o) t(e Acco%nt class ta3ing a single integer arg%ment.

p%blic Acco%nt.ne+..

All p%blic constr%ctors o) t(e Acco%nt class ta3ing any n%mber and type o) arg%ments.

p%blic Acco%nt>.ne+..

Any p%blic constr%ctor o) t(e Acco%nt class or its s%bclasses.

p%blic =Acco%nt.ne+..

Any p%blic constr%ctor o) classes +it( names ending +it( Acco%nt.

p%blic Acco%nt.ne+.. t(ro+s :nvalidAcco%nt#%mber0ception

Any p%blic constr%ctors o) t(e Acco%nt class t(at declare t(ey can t(ro+:nvalidAcco%nt#%mber0ception.


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Signat%re ;ield

private foat Acco%nt.Gbalance

Private eld Gbalance o) t(e Acco%nt class

Acco%nt.=

All elds o) t(e Acco%nt class regardless o) an access modier- type- or name

?p%blic static = ban3ing..=.=

All nonp%blic static elds o) ban3ing and its direct and indirect s%bpac3ages

p%blic ?nal =.=

#onnal p%blic elds o) any class


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PointC%t ype

• "et(od call

callp%blic = Acco%nt.=

• "et(od eec%tion

eec%tep%blic = Acco%nt.=

• Constr%ctor call

callp%blic = Acco%nt.ne+

• Constr%ctor eec%tion

eec%tep%blic = Acco%nt.ne+


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• ;ield Set Access

set;ield Signat%re

• ;ield Het Access

get;ield Signat%re

• 0ception (andler eec%tion

(andlerype signat%re

• Ob2ect initiali,ation

initiali,ationConstr%ctor Signat%re

• Ob2ect pre$initiali,ation

preinitiali,ationConstr%ctor Signat%re


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t(is - target- args- +it(in-

. t(istype- instance o) ob2ect

. targettype- instance o) ob2ect

. args..


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Advice

(e code t(at is eec%ted at a partic%lar 2oin poinadvice

. Be)ore

. A)ter

. A)ter Ret%rning

. A)ter (ro+

. Aro%nd


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Be)ore advice0ec%te code be)ore 2oin points t(at point c%t collect +it( +eaving r%

A)ter advice0ec%te code a)ter t(e 2oin points t(at point c%t collect +it( +eaving


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A)ter t(ro+


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A)ter t(ro+0ec%te code +(en 2oin points t(at point c%t collect +it( +eaving r%leeception

DonFt eec%te i) t(e 2oin point donFt t(ro+ eception

Capt%re t(e type o) eception

Aro%nd


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Aro%nd0ec%te code be)ore and a)ter 2oin points t(at point c%t collect +it( +

process


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Passing contet into advice


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:ntrod%ction

:ntrod%ce s%c( members elds- met(ods into spclass

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