mirror of https://github.com/M66B/FairEmail.git
56 lines
1.7 KiB
Kotlin
56 lines
1.7 KiB
Kotlin
/*
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* Copyright 2018 The Android Open Source Project
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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 androidx.room
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import androidx.lifecycle.LiveData
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import java.util.Collections
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import java.util.IdentityHashMap
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import java.util.concurrent.Callable
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/**
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* A helper class that maintains [RoomTrackingLiveData] instances for an
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* [InvalidationTracker].
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*
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* We keep a strong reference to active LiveData instances to avoid garbage collection in case
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* developer does not hold onto the returned LiveData.
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*/
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internal class InvalidationLiveDataContainer(private val database: RoomDatabase) {
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internal val liveDataSet: MutableSet<LiveData<*>> = Collections.newSetFromMap(IdentityHashMap())
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fun <T> create(
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tableNames: Array<out String>,
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inTransaction: Boolean,
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computeFunction: Callable<T?>
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): LiveData<T> {
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return RoomTrackingLiveData(
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database,
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this,
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inTransaction,
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computeFunction,
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tableNames
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)
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}
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fun onActive(liveData: LiveData<*>) {
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liveDataSet.add(liveData)
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}
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fun onInactive(liveData: LiveData<*>) {
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liveDataSet.remove(liveData)
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}
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}
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