forked from GitHub-Mirror/riotX-android
75 lines
2.5 KiB
Kotlin
75 lines
2.5 KiB
Kotlin
/*
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* Copyright 2019 New Vector Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package im.vector.matrix.android.internal.database
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import com.zhuinden.monarchy.Monarchy
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import im.vector.matrix.android.internal.util.createBackgroundHandler
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import io.realm.OrderedCollectionChangeSet
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import io.realm.OrderedRealmCollectionChangeListener
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import io.realm.Realm
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import io.realm.RealmConfiguration
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import io.realm.RealmObject
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import io.realm.RealmResults
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import java.util.concurrent.atomic.AtomicBoolean
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import java.util.concurrent.atomic.AtomicReference
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internal interface LiveEntityObserver {
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fun start()
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fun dispose()
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fun isStarted(): Boolean
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}
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internal abstract class RealmLiveEntityObserver<T : RealmObject>(protected val realmConfiguration: RealmConfiguration)
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: LiveEntityObserver, OrderedRealmCollectionChangeListener<RealmResults<T>> {
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private companion object {
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val BACKGROUND_HANDLER = createBackgroundHandler("LIVE_ENTITY_BACKGROUND")
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}
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protected abstract val query: Monarchy.Query<T>
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private val isStarted = AtomicBoolean(false)
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private val backgroundRealm = AtomicReference<Realm>()
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private lateinit var results: AtomicReference<RealmResults<T>>
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override fun start() {
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if (isStarted.compareAndSet(false, true)) {
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BACKGROUND_HANDLER.post {
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val realm = Realm.getInstance(realmConfiguration)
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backgroundRealm.set(realm)
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val queryResults = query.createQuery(realm).findAll()
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queryResults.addChangeListener(this)
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results = AtomicReference(queryResults)
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}
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}
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}
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override fun dispose() {
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if (isStarted.compareAndSet(true, false)) {
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BACKGROUND_HANDLER.post {
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results.getAndSet(null).removeAllChangeListeners()
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backgroundRealm.getAndSet(null).also {
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it.close()
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}
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}
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}
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}
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override fun isStarted(): Boolean {
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return isStarted.get()
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}
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} |