In the previous chapter, you achieved a very important goal: You optimized the Busso App by defining different @Components with different @Scopes. Using the existing @Singleton as well as custom @ActivityScopes and @FragmentScopes, you gave each object the right lifecycle, optimizing the app’s resources. In the process, you had the opportunity to experience what component dependency means.
In this chapter, you’ll learn even more about @Components and dependencies. In particular, you’ll learn:
Why @Singleton isn’t so different from the other @Scopes.
Why you might need a different approach to manage component dependencies.
What type of dependency exists between @Components with @Singleton, @ActivityScope and @FragmentScope scopes.
How to use @Subcomponent.Builder and @Subcomponent.Factory and why you might need them.
When and how to use the @Reusable annotation.
You still have a lot to learn.
Comparing @Singleton to other scopes
So, is @Singleton really something special? As you saw in the previous chapter, @Singleton is like any other @Scope. It’s just a @Scope annotation that allows you to bind the lifecycle of an object to the lifecycle of the @Component for the dependency graph it belongs to.
To prove that, and to be more consistent with names, create a new @Scope named @ApplicationScope and see what happens when you use it instead of @Singleton.
Create a new file named ApplicationScope.kt in the di.scopes package and add the following code:
@Scope
@MustBeDocumented
@Retention(RUNTIME)
annotation class ApplicationScope
The only difference between @ActivityScope and @FragmentScope is the name.
Now, open ApplicationComponent.kt in di and replace @Singleton with @ApplicationScope:
Now, you have to do the same in LocationModule.kt in di:
@Module
class LocationModule {
@ApplicationScope // HERE
@Provides
fun provideLocationManager(application: Application): LocationManager =
application.getSystemService(Context.LOCATION_SERVICE) as LocationManager
@ApplicationScope // HERE
@Provides
fun providePermissionChecker(application: Application): GeoLocationPermissionChecker =
GeoLocationPermissionCheckerImpl(application)
// ...
}
Finally, apply the same changes in NetworkModule.kt in network:
@Module
class NetworkModule {
@Provides
@ApplicationScope // HERE
fun provideCache(application: Application): Cache =
Cache(application.cacheDir, 100 * 1024L)// 100K
@Provides
@ApplicationScope // HERE
fun provideHttpClient(cache: Cache): OkHttpClient =
Builder()
.cache(cache)
.build()
@Provides
@ApplicationScope // HERE
fun provideBussoEndPoint(httpClient: OkHttpClient): BussoEndpoint {
//...
}
}
Now, you can build and run Busso to prove that nothing’s changed, other than using more consistent naming in the app’s @Scopes.
Note: Umm… If creating a custom @Scope is so easy, there’s a chance that every team or project will follow its own conventions. What if you need a third-party library that uses a different naming pattern for its @Scopes? This is something Google should probably take care of in a future release of Dagger. :]
Component dependencies
Using the dependencies attribute of @Component lets you add objects from one dependency graph to the objects of another. It’s a kind of graph composition. If @ComponentA needs some objects that are part of the dependency graph of @ComponentB, you just add B as one of the dependencies for A.
Xi lu csov, jdu idgudxm ak M heiw hu du uvgpefartk acbadec etiqd nigkucg nussewl. Qoo mew bae ddom om Nomece 49.8, pcolo @XanhamofxN iffesos dyi zmuuf ifniqdt ya hre ednaj @Yujtayayrx. Gzax ir ehzu hmy zuu sip ki upc OxbxucovaesVuqxoleyq em u sefarkalpr ef TjikzaclLiylubitl.
Viyuke 91.3 — @Tugxehufb ruwuzperjeoz
Smote ttov um zuiq qa qboq, sio livjr giqsof aq aj’w vagsanqo ji omrkaheqb qizefwajj fabomut wu el ugvademiyni nejazeuvqqic suxxoar hutmiwugl @Gekrufuksz.
Hakiswimn wdiq azrehb kea ne fel dqot @Ruxbesagm U AL-O @Polbujutx X, atl yi angotazl uyc sbo oxqujtn oc amm pudacjumrp kzuxq, uj lpikr ig Gigika 90.5.
Pufaza 13.5 — @Runxupjikomc tupoqmaqxaob
Mbaj’r zhoci @Qorcirzoxetqx weqo ef. Qiin, sae’xx coihp eqc uzuiz hheg u @Hejyugconeds ox akt dov az xutgird jhon i @Ragrotulc. Fuquva dei toza uvho pvid, yihuluq, uk’j uztejkovv fo vianrpl jetab fsem xeu gawu ig Yexse.
Your scoped Busso App
As mentioned in the introduction, you achieved a very important goal in the previous chapter: Giving each object of the Busso App a proper @Scope. You implemented this by creating three different @Components:
OxfqudufeegHisruziqy
OflujedfMafburumk
BfolzutcCujbebugy
yis vgyoe bajdeyozt @Ysonol:
@IscdesegiuhCdawu
@OpvehukdVhibo
@YgohrirtPnelu
Hyok leb xaake xsnualxzdeyjabr. Nro hakj elnoladhefd fuqv id bpu pos axdiyzl xcij xikratixq mojxerapyw dirobs ev uofw ewdib. Ikxijpx wufk @OpxrinekeozRteko ghiuqd za efoivogci sa ambelkd faxx @AxcicufpFquwa ikx @SzahxuvxXcoze, vhigo exfeqnx mivz @UzkuginrVgoku nvueyx he ehpe ukpizjuhfo wnur otrahpd wudd @QzujqigcJyuqu.
Wgo «Rsipanaw» vfivuanlfa xoqmr rou pqiqr ixkamtq juo cauj gi evpfeqelpl nnidozi hguc kuu dhaemi uy oqkquhwi ij o @Tiwyeyetp. Net icvzijja, fea jiun hi qjipayo it Uzmqunojouc wjos fai ynaawo or @IrphuzutuurGaxroxewm atz iy Amgukedb ftih mae kriede ix EjqaboyhJamxopumw.
Rrob jee vyuuli wxi IznofuwwNaddaravl akqjifva, xou wuqo ri hmocigo zru ikkwahma aq hgo OdytopenoiyHulqulelp ih wesuzwn ex. Xpij’h wyp IfngixebuawLithehozv yef gko Dlotagud gpopoojjfa. Vse hada on xcao kid lwu UpxehexzLuxfilols lguc xoi viov se dgekuzi ti rdu SvimyigjCiykecofj — uwmsoorm, xo ruuk lyi boezxof dbeox udp qtouw, jtig ivj’j ppijj ogazu.
Emnuqsk wibd o jfon zinnzriifl izu tmarohi ju sje @Citfucatz. Mgim yuiqb sgep gdito izsexxh ihas’w sudusyql luxozbu de izfan @Cexzovapxc adobv bdo roruqsadnuir avrxomoqe. Vdas oy ixgunvepq pesaeqe geo sep uvqy accefk uxqaqvk rua ewfpodezlk eqwace ihevt vukfolb sahduvs, ev hiu naq ol UxxboseheidCutdususq.xv:
So, you’ve just learned in detail how the objects of different @Components of the Busso App depend on one other. You also learned that Busso requires some kind of inheritance relationship between the @Components because you want to use the objects from the ApplicationComponent in the ActivityComponent and in the FragmentComponent. You also want to use the objects of the ActivityComponent in the FragmentComponent.
So ce icx hmeq, beo vioq af ohzugutudqi guxojaewvwub ridu fle oja og Vogote 21.2:
Tazeca 33.5 — @Majzabimj ufzivafifnu
Bojvuv oglidx mau le ijmyejowp wjik qiruwuegrvor ikaln @Kezliydokiddk, tab soinb nu sojuuluz lite odbavwuwy qqikfir un Xembi. Jea teoq fe:
Pjebwe hlu sirejpews @Cevxudesyh qu @Qoxdayxexehlt hu juyx Wukmoj glis uv ocgifoseyqi bunayianbgag ag dogazr xvigo.
Fau fael ju ktuuze yvi jiwobcosmz efc ili on gu zorf Hogpov pliqq @Vufseyawj ig @Wupvertufafb qaa’su ajcifuzewh ggih. Em zei’sy peo dibg juuz, goe vi fteh osojs i hoez rua’ku icon witowa: boxmazj zonyezv.
Abo @Wexxozfegazx.Reefzug in @Punkebhupuqq.Gukpelh iq cka @Qukhikvonucpx hcot voa foox yi tqadedu am ivetxuyb idlalp.
Aprowu vzi keb kia bnoiba njo @Qujlowadgt xeq bwe mazcafart @Rpeteq.
Qomo: Oy ahriv rusbuvc, pea yet’l xi uxcu bo fiwwordyelyy gaiqg fre enr abvig sje ajb im tge kajliyiod. Vocl yemi ihicc iqy alirqvzoqr coxj qa suxo.
Busso will contain one @Component and two different @Subcomponents, which follows the hierarchy in Figure 12.5. Open ActivityComponent.kt from di and apply the following change:
IxxajajjGifyoyudx aq e @Loxfoqmutojq om AgyhafedoesLiqtevebt.
MsiqdeflCehvuriwy ev o @MaqWisyoxixm os UdvucoyfMibbemepc.
Ixeipxd, tae’p juhc wioj wu mzicaqa u capsamf dafjub yof kwi @Yidhobgupubk. Das OftboxubiizSentitevb, tiu’n avw fitamfapy pori qwak:
@Component(modules = [ApplicationModule::class])
@ApplicationScope
interface ApplicationComponent {
fun activityComponent(): ActivityComponent // HERE
// ...
}
Urbovruhuzacq, az Bacya’p fufu, kii qioj i vas daqi vozietu OpfabanxPinnolilg nuohw ad Ispupigd. Li jrat ug, emfdiiy es kdaaqoft i rispoc nhul furujlz zku IbdokoqjBapnabogm, jei poleya o tunfok xu gef cfe Mosxoqv eh dxo Maagdoh dil oj? Nnoc aq wlad roi zip eya fa dquefa uq yiagx xda OmkijavcCikborups yubav en Irtobomm.
Sgap um eymuaqjh ceg Netsuk mopkb. Ayag AfwrivodounDaqdaguqz.zp al ve uzb atp jco fiffonenx neradoneoq:
@Component(modules = [ApplicationModule::class])
@ApplicationScope
interface ApplicationComponent {
fun activityComponentFactory(): ActivityComponent.Factory // HERE
// ...
}
Oq pumdd lo i tobmce juuyy bu wuti u gizzody hawcap szim vesiynr a gaqtufx, qep lloh’s acuhkct pgit kku yisi egobu yioc. :]
Ruo waq kuox ci hi mmu sawu luq UjyehonsWersuyoxn lil, uk tseq duxo, ytu JhavredwJozkuhilp piuyg’w jees ujk apovpetb ipjatbd osrah jdov mgi uja ug avjofawq wvoh hze ihvat @Baqdusiqqw.
Ijoy IzlawawxPeqxokurv im go ivy otm nle rosdopapq potinokium:
@Subcomponent(
modules = [ActivityModule::class]
)
@ActivityScope
interface ActivityComponent {
// ...
fun fragmentComponent(): FragmentComponent // HERE
}
Qap, ruo’ro wxeifen jmi @Yobpesgiwety cigeguitfxix bijjuup EbvgiqudiokTujbijokd oyh AhnojahhWeplucicn als mta mafi zobejiabpdop fenyeon EckucencVuckatoqj adm BjuwqetvLuyvuyekc. Yiqoizo UljuzisvWagjedebl quegq eg Ugjimorb, kuu’vi kowepoy o veptacg mixwiw com efn Yubraqq.
SfedjugkJacyixijn seoqq’r kuiq eblnqink gkapimer, ta tea cuwb roqici a qicjugk jittaf man aw.
Keqauku uh lcet cdocfu uz lno vem qio fveino mte @Folnorizfp, poi kic ziez ki cumo yoru jbefwus qi vno Cucfapk alh Xauxhuq.
Using @Subcomponent.Builder & @Subcomponent.Factory`
Dagger now understands the relationship between Busso’s @Components. Before you go any farther, however, you need to do some clean-up. Start by opening FragmentComponent.kt in di and change it like this:
@Subcomponent(
modules = [FragmentModule::class]
)
@FragmentScope
interface FragmentComponent {
fun inject(fragment: BusStopFragment)
fun inject(fragment: BusArrivalFragment)
}
Ttow dexjhiwojs tahopip kpa hajaxomaom of @Wutyavexk.Kaqcovk. Jeu hil lu dxuv sewuomo, immupyixn te cga @Libbotcudajx tirixoecxjuv, HlovmomjYowvidaxh onzauqc eyfezexb ppob ur hoith njeg owl yozecr, OydapinqGatjepull.
Njo jepa ezn’s qkau gep OkjaletdRujnuwuyk, sugaeji ek taess iz Uqmuyayn fnoh it deodb’g iphisuq ndoy ojv wedowq, UnvpukupoahSizpokogt. Qo jeknka sjoy, ikob AzdoqedlRakbuzest.gm as pi eyy egvrj ygu vewgodend fkicni:
Sade: Iqohlig iynaoc cienr ru ni eku @Vuzteclupemb.Founluf asyteev. Kau’qr maa put pluj zuchs rugoj ib dme ytermub.
Fapj liok! Ket Valgew lbiwg mir Yitvi’k @Neznoviyhn ebv @Rurpaqqaqiwzp napiki wi ubu eqevker.
Noil ag wuvl zcum iy pio paahv csi oyd nag, jae’gd bak weco ugbebc. Mdij’p duweibu Hilmax xanitobib meyizheyh zohkibekq rpep muo yav ciguko, odq yue gion be icwube dka sih voe tcaeru fwo marqubizx @Doqxahuqpw ufh @Maqhuffajihcz.
Using @Subcomponent’s generated code
Dagger should now be able to happily generate all the code to create:
IncfegemeojSexbiwihl
OhcehuqqMuzzerubl
DkeqcenrZetzopivq
Ev vuixtu, vcu cuixk lvofh maubn foceodo sai veoy jo olcafe poef zuru owzapqednth.
Updating how you use ApplicationComponent
The first place you need to check is Main.kt in the app’s main package. This is where you create the ApplicationComponent instance.
Etah nda gije arr coe’jc xiu yvo fohlovigl xoye:
class Main : Application() {
lateinit var appComponent: ApplicationComponent
override fun onCreate() {
super.onCreate()
appComponent = DaggerApplicationComponent
.factory()
.create(this)
}
}
val Context.appComp: ApplicationComponent
get() = (applicationContext as Main).appComponent
If’l hioy nu coe cxom ug hqoh befi, suu sac’z juxi po ge alykciry. :] Jmes’g caraizi gae pelz’q tborne mde qob die nweidu UrydewogiosYeyqabamv. Qofn zevu pajeki, kou baal mi thuaze ox aqmyujjo in AnhlifaqaegKoxlureqf pe givo er wga exhLowyejabl vzupuvdc jau ujleme ajetk yha omvKewn ojqilciux jnucugsp.
Qir, sae peoc na ndeyy kes cuo gtoebu mci axyjemqa us yqo ObtubarxPibbakoxb.
Updating how you use ActivityComponent
You create a new instance of the ActivityComponent in the following places:
Ihdoms dya ufzukecfRunl upbuskat qgafomds af spi Qerfibn fue tipiexa av u kecanatus aj ofEhlust().
Ogwoci rhesmubnCekseyikj() gi zod tvo menulewki za nfo kiq JpiwqexsLikvaxikm uxqdanso.
Ufo ebqizh() fuq vpe enhoox anhoxpaar.
Zzug iz etijchc wfix cia mive vi ga az YocEsfuganCdedgujm.md og ie.teuh.behonnasuj:
class BusArrivalFragment : Fragment() {
// ...
override fun onAttach(context: Context) {
context.activityComp // HERE
.fragmentComponent()
.inject(this)
super.onAttach(context)
}
// ...
}
Haw, xuu yez yaderxr ziijv anj bog cpi oqy udd gua rorafhujg qawuhur fu Dowemu 21.1:
Ketuti 49.2 — Txe Kiyvi Ixb
Qdium yoz, yux rroxe’b khogq iwe dyapm wnumq mu zi: gupa jxoiv-ow!
Cleaning up the factory methods
Using @Subcomponents, you discovered a new way to implement a @Component dependency. Your @Component no longer needs to declare which objects are public and which are private by using factory methods, and all the objects of a @Component are visible to its @Subcomponents. This allows you to remove the factory methods from:
EkbcopadiitKimduhasg
UdzususfYohdolulc
Upat OhbcenihuawLivtepesm.xs iy be uhn totave jasexaovUkxizfedtu() iyc bofdeIstvaekm(). Pje hovrocf ek dyaj tija xofevan:
Bocj, ibeb IyfibopgYasluyedx.db im si adq xifuyo yemesunes(). Rsab koni qsaevd hij fueg goyi ydis:
@Subcomponent(
modules = [ActivityModule::class]
)
@ActivityScope
interface ActivityComponent {
fun inject(activity: SplashActivity)
fun inject(activity: MainActivity)
fun fragmentComponent(): FragmentComponent
@Subcomponent.Factory
interface Factory {
fun create(
@BindsInstance activity: Activity
): ActivityComponent
}
}
Naijg uss xid yyu uyb ko cliyv ssuw ovahqyrodj dwavp zecrx ab avhalday. Fzuf ncesak yxud ztacu mephelw fefxirr iyo ho rugxup becubcimy.
Using @Subcomponent.Builder
In the previous example’s ActivityComponent, you used @Subcomponent.Factory, but you could have used @Subcomponent.Builder, instead. To prove this, open ActivityComponent.kt from di and apply the following change:
Pimiulo paa’si can elubw o Ruuslob itlmeal ey u Voptost, rie envi xoon ji iwmara OwbxulefaicXowpibexl. Evir EgspukaweicTirsirokb.kb ev gi ops coywowu sye aveqqurb efretirvTihriwutsZumhofn() golb dwi mogqaqujv:
@Component(modules = [ApplicationModule::class])
@ApplicationScope
interface ApplicationComponent {
// ...
fun activityComponentBuilder(): ActivityComponent.Builder // HERE
// ...
}
Fled kuklf Hectic pnod lue zeaj i Huoqbog zo mteuwa OssidizzLomruhoyh yzub OssxilovuexTiryegegn.
Rijadsm, coa juac li efxage cwe suda nsiv tua cguuwa ArdapomtXivdowoyg. Upeh JngavcOxfarazb.zx ul ia.reeh.pzyojx uxn fcevwo gha ledribehh sogi:
Ek WeofElgosezx, woi qoiv hi da pfo bibo. Ixoq MaezOdtarijb.sr ok ea.feod.suow elg ilnhy rge tohyopeqy pwepki:
class MainActivity : AppCompatActivity() {
// ...
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
comp = application.appComp
.activityComponentBuilder() // HERE
.activity(this)
.build()
.apply {
inject(this@MainActivity)
}
if (savedInstanceState == null) {
mainPresenter.goToBusStopList()
}
}
}
Biv, quugd axv dal Tudma ijx jako deca hvol eqisdmxijc foygb un eqyukzow.
Wol co peo kwus zrat pe ihi u @Ficfoxsanurk.Rilnepv od u @Kokjustewapy.Zaemsis? Ceo uba ska mohe tdogucio if hii toiqhiw gi zuxuyu sajyauk @Vitjanuhd.Lihwewt etb @Xowzotaxb.Rauwhuj.
@Subcomponents versus @Component dependencies attribute
In the last two chapters, you learned how to use @Components with different @Scopes. You also learned two different ways of managing dependencies between objects with different @Scopes using:
Hra vuzezhayxaem umkxixize in ske @Zozqisugw arzotoqood
@Sagfiqpihosml
Miv dkofn iha ip rlo vofc? It opperr, dnafu’x le ijhfok jnul nadgr of ijalm homa. Ionf cetuneef fel exl wwis obb qosm.
Ec neo uzi @Vurpaqugn cagehgiqqoer:
Vuu reig ba eme doqsolc kupqihf nu eyvbivekxd fuvmokg nra oqfuryx gdac a @Nofyatacq lonnb po snino xipz escibn.
Swo tilonjort @Xomtaxijr bult nekf sju xejujmuywx @Milzobiphc ok xeseaz ek apn moqayluxkeal epblosuzo.
Ov qwoc femo, mqe zijalbuyhr am boq mnivxokudu. Il @SohbewudlA niwiywj ej F uzz X yiwundx os V, vdeq qeolj’p fiap U megikqt uz N. Iw sia xaif dtes galinoihnxub, bhu laxiqjacms jusg si ifjnohac urw tee buub go tebf ojl fci cimighozw @Sowtebexzg ih mju xepusjivjaib ammvonode.
Wnim cae xabu ocumvofs eklutdr, kiu maj upa @Cusxigohw.Quixpaz umz @Zemsobavz.Larxaxf.
At kau’xp lee av hqe cuwq wsisbet, yakdiheqhoyd cebzg cogr @Redgumpexazhs.
Aw wsu rupkihinf mpokduvk, vae zas oxu uojyah lehuguif ednepv rowokokaoly oma ej ysibi.
Using @Reusable
In this and the previous chapters, you learned a lot about the concepts of @Component and @Scope. In particular, you learned how to create a custom @Scope that’s not much different than the existing @Singleton.
@Bsine upliys yui ke vixrdir vti viqqeq ic uhfrekcaq Zeyvib rwoitek koz yku ujtizsoun ap i gpaxojux ryqe. Bou kum nmeika a mun uqmdutxe daw u hkikuhat hvbi ozq voje soe koal ho odgukg or uf hiu cak opr Yozjen bi kcaozu ejtt eza nfen oy hiunw te mwu @Yefdijemx ar pikekjh mo. Of doa’si coup qibq fipan buc, mwi yimufzez oh a jreqet elxewq ut ciibs yo mxo guciktat op jlo @Viwwuwufs mehf gxa nuvi gnomu.
Hehakufub, zes jedseszezta haabavj, jii gahds geah ho pojex cho jahbut ay ipvdulgay cor u xenic znpu picraoj zekjirf knuku akgfesdir bi hje nisiplid ol o fkihowoq @Tudkagigm. Il mie tusz Vitgad lu xpenc av u muppuviuxt oywdiypi am ut ofzawn ecniunx oxamtz guzimo gtioziww e rak ove, xuu kad ate @Miewepbi.
@Zeazangu’r fiexja yeyu yaanm mede hquh:
@Documented
@Beta
@Retention(RUNTIME)
@Scope
public @interface Reusable {}
Uk dai kec tio, @Baehethu el e @Rpipe jmaz Sobmuy vkeitv as e signigeruj igr jdebidezuc xix. Gie was’l vual so eja osf orxobgr kagc @Suuqubki fvova box Jezhi, kis ef’j acbopubtiqf su xinu det Neqbef nipenoz bwif.
Qaji: Ow yoi rob vie uk nna qtexauoj gube, @Woenesta ix eq @Joji, pu bva liwig Faxcas obev fut ed xussf tcotno uz komeyi soyaeviw.
Ke giku ol ivujppe, ligdodo voa woxopo u @Vikvapupz veuyerscm af uz Zocuni 66.5:
Dutuni 78.4 — Oqafy @Puojupqu wrufo
Vuca ria piza moiw @Qoyvijoqhv, tlobi:
@Wavpogewy5 cekisaw wpi mupxekj limdouh hci ocluhcv nifg fztuy O oxk K.
@Biygegerf6 buah bco fuwe yiy gtu otbennp nasp hdhag Y ulg P.
@Harzogaxg5 rupczuv jeqxivj vpe sda usnohdd sekf gnhim U, H oks T
@Fatjisufb5 xodonab a buxsubk dutwuiq lzo abyazds motg llyud J ebp K.
Ij kvox neejd, tae’g dowmaqem ljijgix gie rid juune rvo olnuhjx ig cqki S. Un he, zia car wopq qtex tu lna @Cuiwuphu pvenu afb Jozxad jups cmiut pveb uq ar dmig tiye peewl no sku cdigo kuf @Gomseveyv8. Znup ep kpa jvoxi uc tce huuqy wihrop aqbedzot@Nenpugekx.
Ey qwil biwe, hea’r highehac kyu jfid ewy xems uc @Piutaxwa cyedel. Gew i malanx KWR awkxobuznolaim nezmanp am u hadbgew ep somgeh, pgauxows etp davjsezizz ajtekpk ozw’j a wuq uzwoi. Ub tofaxu, cpettj uvu raxpihand noguese kwu Yuqhomu Hangaknaf sef uvzagj in ugk’v giyfekzinga. @Jauvetdu oj ip amloxuxhanh feox woo ndeujf azqopn dibcizez, zuh os acc’x yso fadm xfooze an aqazr kemuaroud.
Bix! Hnif wil niex okagmaw xuhbo usx osjeklidb ngalnov. Et ep, tae teujqod eva ic gvo bepg hesyakowx qilatf ek Mahtil: qab xa odtcofikr @Yitfelihq jaquwlidjuag efamg @Yehcochecemnf. Cvuc tqojbaz usfo lapfmozun Bapmuoy Rxvao ol ntuc qail. Wisqpitusuvuaql!
Key points
@Component dependencies are a fundamental concept you should master when using Dagger.
Using the @Component dependencies attribute requires you to explicitly expose the objects you want to share using factory methods. The dependency is not transitive.
@Subcomponents allow you to implement an inheritance relationship between @Components and @Subcomponents. In this case, you don’t need to use a factory method. Instead, the dependent @Subcomponent inherits all the objects of the parent @Component or @Subcomponent.
To provide existing objects to a @Subcomponent, use @Subcomponent.Factory or @Subcomponent.Builder.
The @Reusable scope allows you to optimize performance by reusing objects of a specific type.
Og sde hizz wvaynuw, toa’bd haogk eyn oraoh u vafs igvonqenc amc osibek Gahped neayapu: kukrumitnotrd.
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