DeviceHolder.kt
/*
* Copyright (C) 2021 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 androidx.test.espresso.device.dagger
import androidx.annotation.RestrictTo
import java.util.concurrent.atomic.AtomicReference
/**
* Holds Espresso's device graph.
*
* @hide
*/
@RestrictTo(RestrictTo.Scope.LIBRARY)
class DeviceHolder {
companion object {
private val instance = AtomicReference<DeviceHolder>(null)
@JvmStatic
fun deviceLayer(): DeviceLayerComponent {
var instanceRef: DeviceHolder? = instance.get()
if (null == instanceRef) {
instanceRef = DeviceHolder(DaggerDeviceLayerComponent.create())
if (instance.compareAndSet(null, instanceRef)) {
return instanceRef.component
} else {
return instance.get().component
}
} else {
return instanceRef.component
}
}
}
private val component: DeviceLayerComponent
private constructor(component: DeviceLayerComponent) {
this.component = component
}
}