Move cache management to a dedicated class and in the setting module, for clarity.

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/auth/MatrixAuthenticationService.kt

@@ -29,13 +29,6 @@ interface MatrixAuthenticationService {
     suspend fun setHomeserver(homeserver: String): Result<Unit>
     suspend fun login(username: String, password: String): Result<SessionId>
 
-    /*
-     * Cache index
-     */
-
-    fun cacheIndex(): Flow<Int>
-    fun incrementCacheIndex()
-
     /*
      * OIDC part.
      */

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/auth/RustMatrixAuthenticationService.kt

@@ -58,8 +58,6 @@ class RustMatrixAuthenticationService @Inject constructor(
     private val clock: SystemClock,
 ) : MatrixAuthenticationService {
 
-    private val cacheIndexState = MutableStateFlow(0)
-
     private val authService: RustAuthenticationService = RustAuthenticationService(
         basePath = baseDirectory.absolutePath,
         passphrase = null,
@@ -73,14 +71,6 @@ class RustMatrixAuthenticationService @Inject constructor(
         return sessionStore.isLoggedIn()
     }
 
-    override fun incrementCacheIndex() {
-        cacheIndexState.value++
-    }
-
-    override fun cacheIndex(): Flow<Int> {
-        return cacheIndexState
-    }
-
     override suspend fun getLatestSessionId(): SessionId? = withContext(coroutineDispatchers.io) {
         sessionStore.getLatestSession()?.userId?.let { SessionId(it) }
     }

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/auth/FakeAuthenticationService.kt

@@ -65,16 +65,6 @@ class FakeAuthenticationService : MatrixAuthenticationService {
         loginError?.let { Result.failure(it) } ?: Result.success(A_USER_ID)
     }
 
-    private val cacheIndexFlow = MutableStateFlow(0)
-
-    override fun cacheIndex(): Flow<Int> {
-        return cacheIndexFlow
-    }
-
-    override fun incrementCacheIndex() {
-        cacheIndexFlow.value++
-    }
-
     override suspend fun getOidcUrl(): Result<OidcDetails> = simulateLongTask {
         oidcError?.let { Result.failure(it) } ?: Result.success(A_OIDC_DATA)
     }