Detailed analysis of the ‘Cl Cronlike’ framework in the Java class library
Detailed analysis of the ‘Cl Cronlike’ framework in the Java class library
Introduction:
'Clonlike' is a class library written in Java. It provides a simple and powerful way to create and schedule tasks based on CRON expression.The CRON expression is a syntax used to describe regular repeated execution tasks, which is very useful in many application scenarios.This article will analyze the 'Cl Cronlike' framework in detail to introduce its core concepts and usage.
1. Framework structure:
The 'clonlike' framework consists of the following core components:
-CRON task scheduler: Responsible for analysis and scheduling CRON expression, and trigger the corresponding task execution.
-The task interface: Define the specifications and interface methods of tasks that require execution.
-CRON expression generator: used to generate the correct CRON expression.
2. CRON expression:
The CRON expression consists of five time fields and an optional year field, which is separated by spaces.Each time field can contain multiple values and specific passes.For example, "*" indicates any value, "?" Means uncertain value, "0/5" means executing every 5 minutes.
3. Task interface:
In the 'Cl Cronlike' framework, we need to implement the task interface, which contains an Execute method to define the specific operation of the task.The following is an example:
public interface Task {
void execute();
}
4. Use examples:
Below is a sample code that uses the 'Cl Cronlike' framework scheduling task:
import com.cl.cronlike.CronScheduler;
public class App {
public static void main(String[] args) {
// Construct CRON task scheduler
CronScheduler scheduler = new CronScheduler();
// Define a task
Task task = () -> system.out.println ("executing my task");
// Add the task to the scheduler and execute it once a minute
scheduler.schedule(task, "0 * * * * ?");
// Start scheduler
scheduler.start();
// The program stops the scheduler after a period of time
try {
Thread.sleep(60000);
} catch (InterruptedException e) {
e.printStackTrace();
}
scheduler.stop();
}
}
In the above example, we first created a Cronscheduler object, then defined a task, and added the task to the scheduler.Finally, start the scheduler by calling the start method, and stop the scheduler by calling the Stop method after a period of time.
in conclusion:
The 'clonlike' framework provides a simple and powerful way to create and schedule tasks based on CRON expression.By using this framework, we can easily create regular tasks and define the specific operations of the task.Whether in the background task scheduling, or timing data synchronization, the 'Cl Cronlike' framework can help us quickly and flexibly realize their needs.
