Use the Jakarta Concurrency framework to manage in the Java class library
Use the Jakarta Concurrency framework to manage in the Java class library
With the development and performance of computer systems, we often need to handle multiple tasks at the same time.In Java programming, managing concurrent tasks is a common but challenging problem.To solve this problem, the Java library provides the Jakarta Concurrency framework, which is a powerful and easy -to -use tool for managing and scheduling tasks.
Jakarta Concurrency Framework is based on the concept of a thread pool, and manages the execution of tasks by creating a thread pool.The thread pool can adjust the number of threads according to different system resources and needs, so as to control the control of concurrent tasks.It can avoid frequent creation and destruction of threads to improve the performance and resource utilization of applications.
When using the Jakarta Concurrency framework to manage the concurrent task, we first need to create a ThreadPoolexecutor object.ThreadPoolexecutor is a class provided by the ExecutorService interface provided by the Java class library, which is responsible for managing thread pools and execution tasks.You can specify the parameters of the thread pool by constructing methods, such as the number of core threads, the maximum number of threads, and thread free time.
Next, we need to define a task class that implements the Runnable interface.This task class should contain the specific task logic we want to execute.For example, we can write a task class to download multiple files at the same time, or process a large amount of data in parallel.
We then submit the task to the thread pool for execution.The thread pool will create threads to perform the task at the right time, and be responsible for the life cycle of the management thread.You can use the Submit () method of ThreadPoolexecutor to submit the task. This method will return a Future object that indicates the execution result of the task.
Under normal circumstances, we can also use the Future object to obtain the execution result of the task or cancel the execution of the task.By calling the get () method of the Future object, the current thread can be blocked until the task is executed and the result is returned.In addition, you can also call the Cancel () method of the Future object to cancel the execution of the task.This is very useful for tasks that need to be interrupted for a long time or canceling no longer needed.
Finally, at the end of the program execution, you need to call the threadPoolexecutor's shutdown () method to close the thread pool.This method will wait for all tasks to be executed before closing the thread pool and release related resources.
Below is a sample code managed by Jakarta Concurrency framework:
import java.util.concurrent.*;
public class ConcurrentTaskExample {
public static void main(String[] args) {
// Create a thread pool
ThreadPoolExecutor executor = new ThreadPoolExecutor(2, 5, 1, TimeUnit.SECONDS, new LinkedBlockingQueue<>());
// Define tasks
Runnable task1 = () -> {
// Specific logic of task 1
// ...
};
Runnable task2 = () -> {
// Specific logic of task 2
// ...
};
// Submit the task
Future<?> future1 = executor.submit(task1);
Future<?> future2 = executor.submit(task2);
// Get the task execution result
try {
Object result1 = future1.get();
Object result2 = future2.get();
System.out.println("Task 1 Result: " + result1);
System.out.println("Task 2 Result: " + result2);
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
}
// Close the thread pool
executor.shutdown();
}
}
In the above example, we created a ThreadPoolexecutor object with the number of core threads 2, the maximum number of threads is 5, and the thread free time is 1 second.Then we defined two tasks TASK1 and Task2, and submitted them to the thread pool with the Executor.Submit () method.Finally, we obtained the execution results of the task by calling Future1.get () and Future2.get () and printed.
