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+/*
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+ * Nextcloud Talk application
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+ *
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+ * @author Álvaro Brey
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+ * Copyright (C) 2022 Álvaro Brey
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+ * Copyright (C) 2022 Nextcloud GmbH
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
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+ */
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+
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+package com.nextcloud.talk.utils.database.user
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+
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+import com.nextcloud.talk.data.user.model.User
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+import com.nextcloud.talk.users.UserManager
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+import io.reactivex.Maybe
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+import io.reactivex.disposables.Disposable
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+import javax.inject.Inject
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+
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+/**
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+ * Listens to changes in the database and provides the current user without needing to query the database everytime.
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+ */
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+class CurrentUserProviderImpl @Inject constructor(private val userManager: UserManager) : CurrentUserProviderNew {
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+ private var _currentUser: User? = null
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+ private var currentUserObserver: Disposable? = null
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+
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+ override val currentUser: Maybe<User>
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+ get() {
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+ if (_currentUser == null) {
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+ // immediately get a result synchronously
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+ _currentUser = userManager.currentUser.blockingGet()
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+ if (currentUserObserver == null) {
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+ // start observable for auto-updates
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+ currentUserObserver = userManager.currentUserObservable.subscribe { _currentUser = it }
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+ }
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+ }
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+ return _currentUser?.let { Maybe.just(it) } ?: Maybe.empty()
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+ }
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+}
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