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• CommonCompletionHandler.kt

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kotlinx.coroutines.experimental.CommonCompletionHandler.kt Maven / Gradle / Ivy

/*
 * Copyright 2016-2017 JetBrains s.r.o.
 *
 * 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 kotlinx.coroutines.experimental

/**
 * Handler for [Job.invokeOnCompletion].
 *
 * Installed handler should not throw any exceptions. If it does, they will get caught,
 * wrapped into [CompletionHandlerException], and rethrown, potentially causing crash of unrelated code.
 *
 * **Note**: This type is a part of internal machinery that supports parent-child hierarchies
 * and allows for implementation of suspending functions that wait on the Job's state.
 * This type should not be used in general application code.
 * Implementations of `CompletionHandler` must be fast and _lock-free_.
 */
public typealias CompletionHandler = (cause: Throwable?) -> Unit