Learn from the Arez Annotations framework of the Java class library
Learn from the Arez Annotations framework of the Java class library
Brief introduction
Arez Annotations is a Java library for building a responsive application.It provides a set of annotations that can simplify the processes of managing state and response behavior in applications.Arez Annotations is the core component of the Arez library. By using annotations, developers can easily define the state of statement and deal with changes in the state to trigger the corresponding operation.
Core idea
Before understanding Arez Annotions in -depth, let's first understand some of the core concepts:
1. Observable (Observed Object): Observable is an object with a state, and its changes can be observed.By using @ObServable annotations, a field or method can be marked as an observed object.
2. Autorun (automatic operation): Autorun is a method that will run automatically and reorganize when the dependent observable object changes.By using @Autorun annotations, a method can be marked automatically.
3. Computed (calculation attribute): Computed is a derivative value generated by other observed objects.By using the @Computed annotation, a method can be marked as the calculation attribute.
4. Dispose: Dispose is a method to release resources and cancel observation.By using @DISPOSE annotations, one method can be marked as destroyed.
Exemplary example
Below is a simple example that demonstrates how to use these annotations in the Arez Annotations framework:
import arez.annotations.*;
@ArezComponent
public class Counter {
private int count;
@Observable
public int getCount() {
return count;
}
@Action
public void increment() {
count++;
}
@Autorun
public void logCount() {
System.out.println("Count: " + getCount());
}
}
public class Main {
public static void main(String[] args) {
Counter counter = new Counter();
counter.increment (); // Output: count: 1
}
}
In the above example, the Counter class uses the @arezcomponent annotation to mark it, indicating that it is an Arez component.The field count is marked as @ObServable, indicating that it is an observed object.Methods getCount () is marked as @ObServable, which returns the value of Count.Method increment () is marked as @ACTION, indicating that it is an executable operation.Methods Logcount () are marked as @Autorun, which will run automatically every time the count changes.
in conclusion
By using the ANNOTATIONS framework, developers can easily manage and maintain status and response behaviors in applications.It provides a set of easy -to -use annotations that can define the state of statement and respond to changes in the state.This allows developers to focus more on the business logic of the application without paying too much attention to the details of status management.
