/
Repository.kt
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/
Repository.kt
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/*
* Copyright 2022 Google LLC
*
* 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
*
* https://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.example.android.coroutines.testing
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.async
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import java.util.concurrent.atomic.AtomicBoolean
// [START coroutine_test_repo_dispatcher_injection]
// Example class demonstrating dispatcher use cases
class Repository(private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO) {
private val scope = CoroutineScope(ioDispatcher)
val initialized = AtomicBoolean(false)
// A function that starts a new coroutine on the IO dispatcher
fun initialize() {
scope.launch {
initialized.set(true)
}
}
// A suspending function that switches to the IO dispatcher
suspend fun fetchData(): String = withContext(ioDispatcher) {
require(initialized.get()) { "Repository should be initialized first" }
delay(500L)
"Hello world"
}
}
// [END coroutine_test_repo_dispatcher_injection]
// [START coroutine_test_repo_dispatcher_injection_better]
class BetterRepository(private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO) {
private val scope = CoroutineScope(ioDispatcher)
// [START_EXCLUDE silent]
val initialized = AtomicBoolean(false)
// [END_EXCLUDE]
fun initialize() = scope.async {
// [START_EXCLUDE]
initialized.set(true)
// [END_EXCLUDE]
}
// [START_EXCLUDE silent]
suspend fun fetchData(): String = withContext(ioDispatcher) {
require(initialized.get()) { "Repository should be initialized first" }
delay(500L)
"Hello world"
}
// [END_EXCLUDE]
}
// [END coroutine_test_repo_dispatcher_injection_better]