Learn Kotlinx Coroutines Core framework: processing multi -threaded concurrency in the Java library
Learn Kotlinx Coroutines Core framework: processing multi -threaded concurrency in the Java library
introduction:
In Java development, processing multi -threaded concurrency is a common and important task.The traditional Java multi -threaded programming mode uses the Thread and Runnable interfaces, but this method is prone to errors and the code is lengthy.To solve this problem, Kotlin introduced the Kotlinx Coroutines Core framework, which provides a new method of simplifying multi -threaded programming.This article will introduce how to use the Kotlinx Coroutines Core framework to handle multi -threaded concurrency in the Java library.
Introduce Kotlinx Coroutines Core framework:
Kotlinx Coroutines Core framework is a powerful tool for simplifying multi -threaded programming.Based on the concept of the coroutine, it allows developers to write asynchronous code in order without the need to use the callback function or the underlying thread management.The Kotlinx Coroutines Core framework provides many easy -to -use functions and extensions to help developers handle concurrency and simplify the code structure.
Configuration development environment:
Before starting to learn Kotlinx Coroutines Core framework, you need to configure the development environment.The following is the step of installation and configuration development environment:
1. Download Kotlin programming language and Java Development Kit (JDK).
2. Install Kotlin programming language and JDK.
3. Configure the development environment variables to ensure that the Kotlin programming language and JDK can be used in the command line.
Write Kotlinx Coroutines Core example code:
Once the development environment is configured, you can write Kotlinx Coroutish Core example code.The following is a simple example showing how to use Kotlinx Coroutines Core framework to handle multi -threaded concurrency:
kotlin
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.async
import kotlinx.coroutines.runBlocking
fun main() {
Println ("main thread starts")
runBlocking {
val result1 = async(Dispatchers.IO) {
longRunningOperation1()
}
val result2 = async(Dispatchers.Default) {
longRunningOperation2()
}
val combinedResult = "${result1.await()} ${result2.await()}"
Println ("The final result: $ CombinedResult")
}
Println ("The main thread ends")
}
suspend fun longRunningOperation1(): String {
Println ("Operation operated by the Captain for a long time 1 ...")
// Simulates the operation of long -term operation
kotlinx.coroutines.delay(2000)
Return "Result 1"
}
suspend fun longRunningOperation2(): String {
Println ("Operation operated by the Captain for a long time 2 ...")
// Simulates the operation of long -term operation
kotlinx.coroutines.delay(3000)
Return "Result 2"
}
In this example, we use several important components in the Kotlinx.coroutines package.First, we use the RunBlocking function to start the coroutine in the main thread.We then use the async function to create two coroutines to indicate two long -term operations.Each coroutine uses different scheduers.io and dispatches.default to perform operations in the IO thread and the default thread pool, respectively.Finally, we use the AWAIT function to wait for the coroutine to execute and get its results.The final result is combined by string stitching and printed on the console.
Summarize:
Through the Kotlinx Coroutines Core framework, we can achieve multi -threaded concurrency in a simplified way.This framework provides easy -to -use functions and extensions, helps developers handle concurrency, and simplify the code structure.By learning and using the Kotlinx Coroutines Core framework, we can better deal with the needs of multi -threaded concurrency and improve the performance and readability of the Java library.
