Extract RoboApplication object caching to Launcher3 interface.

/*

 * Copyright (C) 2024 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.launcher3

import com.android.launcher3.util.MainThreadInitializedObject

import com.android.launcher3.util.MainThreadInitializedObject.SandboxApplication

import com.android.launcher3.util.SafeCloseable

/**

 * Initializes [MainThreadInitializedObject] instances for Robolectric tests.

 *

 * Unlike instrumentation tests, Robolectric creates a new application instance for each test, which

 * could cause the various static objects defined in [MainThreadInitializedObject] to leak. Thus, a

 * [SandboxApplication] for Robolectric tests can implement this interface to limit the lifecycle of

 * these objects to a single test.

 */

interface RoboObjectInitializer {

    /** Overrides an object with [type] to [value]. */

    fun <T : SafeCloseable> initializeObject(type: MainThreadInitializedObject<T>, value: T)

}