room/integration-tests/kotlintestapp/src/androidTest/java/androidx/room/integration/kotlintestapp/NewThreadDispatcher.kt

/*
 * Copyright 2018 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.room.integration.kotlintestapp

import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.InternalCoroutinesApi
import kotlinx.coroutines.Runnable
import java.util.concurrent.atomic.AtomicInteger
import kotlin.concurrent.thread
import kotlin.coroutines.CoroutineContext

/**
 * A CoroutineDispatcher that dispatches every block into a new thread
 */
class NewThreadDispatcher : CoroutineDispatcher() {
    private val idCounter = AtomicInteger(0)
    @InternalCoroutinesApi
    override fun dispatchYield(context: CoroutineContext, block: Runnable) {
        super.dispatchYield(context, block)
    }

    override fun isDispatchNeeded(context: CoroutineContext) = true

    override fun dispatch(context: CoroutineContext, block: Runnable) {
        thread(
            name = "NewThreadDispatcher[${idCounter.incrementAndGet()}]"
        ) {
            block.run()
        }
    }
}