mirror of https://github.com/M66B/FairEmail.git
60 lines
1.9 KiB
Java
60 lines
1.9 KiB
Java
/*
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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.annotation.VisibleForTesting;
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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.Set;
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import java.util.concurrent.Callable;
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/**
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* A helper class that maintains {@link RoomTrackingLiveData} instances for an
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* {@link InvalidationTracker}.
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* <p>
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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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class InvalidationLiveDataContainer {
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@SuppressWarnings("WeakerAccess")
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@VisibleForTesting
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final Set<LiveData> mLiveDataSet = Collections.newSetFromMap(
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new IdentityHashMap<LiveData, Boolean>()
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);
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private final RoomDatabase mDatabase;
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InvalidationLiveDataContainer(RoomDatabase database) {
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mDatabase = database;
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}
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<T> LiveData<T> create(String[] tableNames, boolean inTransaction,
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Callable<T> computeFunction) {
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return new RoomTrackingLiveData<>(mDatabase, this, inTransaction, computeFunction,
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tableNames);
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}
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void onActive(LiveData liveData) {
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mLiveDataSet.add(liveData);
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}
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void onInactive(LiveData liveData) {
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mLiveDataSet.remove(liveData);
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}
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}
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