InteractiveInstanceManager.kt
/*
* Copyright 2020 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.wear.watchface.control
import android.annotation.SuppressLint
import androidx.annotation.UiThread
internal class InteractiveInstanceManager {
private constructor()
private class RefCountedInteractiveWatchFaceInstance(
val instance: InteractiveWatchFaceInstance,
var refcount: Int
)
companion object {
private val instances = HashMap<String, RefCountedInteractiveWatchFaceInstance>()
@SuppressLint("SyntheticAccessor")
@UiThread
fun addInstance(instance: InteractiveWatchFaceInstance) {
require(!instances.containsKey(instance.instanceId))
instances[instance.instanceId] = RefCountedInteractiveWatchFaceInstance(instance, 1)
}
@SuppressLint("SyntheticAccessor")
@UiThread
fun getAndRetainInstance(instanceId: String): InteractiveWatchFaceInstance ? {
val refCountedInstance = instances[instanceId] ?: return null
refCountedInstance.refcount++
return refCountedInstance.instance
}
@SuppressLint("SyntheticAccessor")
@UiThread
fun releaseInstance(instanceId: String) {
val instance = instances[instanceId]!!
if (--instance.refcount == 0) {
instance.instance.engine.onDestroy()
instances.remove(instanceId)
}
}
}
}