DirectExecutor.kt
/*
* Copyright 2023 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.camera.impl.utils.executor
import java.util.concurrent.Executor
/**
* An [Executor] that runs each task in the thread that invokes [Executor.execute].
*/
internal class DirectExecutor : Executor {
override fun execute(command: Runnable) {
command.run()
}
companion object {
@Volatile
private var directExecutor: DirectExecutor? = null
val instance: Executor
get() {
if (directExecutor != null) {
return directExecutor!!
}
synchronized(DirectExecutor::class.java) {
if (directExecutor == null) {
directExecutor = DirectExecutor()
}
}
return directExecutor!!
}
}
}