/*
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* Copyright (C) 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 com.android.launcher3.util;
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import android.content.Context;
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import android.os.Looper;
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import com.android.launcher3.MainThreadExecutor;
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import java.util.concurrent.ExecutionException;
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import androidx.annotation.VisibleForTesting;
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/**
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* Utility class for defining singletons which are initiated on main thread.
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*/
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public class MainThreadInitializedObject<T> {
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private final ObjectProvider<T> mProvider;
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private T mValue;
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public MainThreadInitializedObject(ObjectProvider<T> provider) {
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mProvider = provider;
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}
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public T get(Context context) {
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if (mValue == null) {
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if (Looper.myLooper() == Looper.getMainLooper()) {
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mValue = mProvider.get(context.getApplicationContext());
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} else {
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try {
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return new MainThreadExecutor().submit(() -> get(context)).get();
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} catch (InterruptedException|ExecutionException e) {
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throw new RuntimeException(e);
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}
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}
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}
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return mValue;
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}
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public T getNoCreate() {
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return mValue;
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}
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@VisibleForTesting
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public void initializeForTesting(T value) {
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mValue = value;
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}
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public interface ObjectProvider<T> {
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T get(Context context);
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}
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}
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