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CurrentUserProviderImpl: ensure only one observer is set up for all threads

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Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>
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Álvaro Brey 2022-12-14 12:13:57 +01:00 committed by Andy Scherzinger
parent 25dd46f95a
commit 2e2d4a9ca3
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1 changed files with 9 additions and 2 deletions
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app/src/main/java/com/nextcloud/talk/utils/database/user/CurrentUserProviderImpl.kt
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@ -31,7 +31,12 @@ import javax.inject.Inject
* Listens to changes in the database and provides the current user without needing to query the database everytime. * Listens to changes in the database and provides the current user without needing to query the database everytime.
*/ */
class CurrentUserProviderImpl @Inject constructor(private val userManager: UserManager) : CurrentUserProviderNew { class CurrentUserProviderImpl @Inject constructor(private val userManager: UserManager) : CurrentUserProviderNew {
private var _currentUser: User? = null private var _currentUser: User? = null
// synchronized to avoid multiple observers initialized from different threads
@get:Synchronized
@set:Synchronized
private var currentUserObserver: Disposable? = null private var currentUserObserver: Disposable? = null
override val currentUser: Maybe<User> override val currentUser: Maybe<User>
@ -40,8 +45,10 @@ class CurrentUserProviderImpl @Inject constructor(private val userManager: UserM
// immediately get a result synchronously // immediately get a result synchronously
_currentUser = userManager.currentUser.blockingGet() _currentUser = userManager.currentUser.blockingGet()
if (currentUserObserver == null) { if (currentUserObserver == null) {
// start observable for auto-updates currentUserObserver = userManager.currentUserObservable
currentUserObserver = userManager.currentUserObservable.subscribe { _currentUser = it } .subscribe {
_currentUser = it
}
} }
} }
return _currentUser?.let { Maybe.just(it) } ?: Maybe.empty() return _currentUser?.let { Maybe.just(it) } ?: Maybe.empty()