Microprofile Metrics API: Introduction to a lightweight measuring framework
Microprofile Metrics API is a lightweight measuring framework that provides a simple way to collect and disclose data in Java applications.Merture data is the key indicator of application performance and behavior. By collecting and analyzing these data, developers can help developers better understand the operation of the application, optimize performance, and improve user experience.
Microprofile Metrics API provides a set of annotations and interfaces to define the measurement indicators.Developers can mark places where the methods, classes, or fields that apply these annotations to their code are marked where the measurement data needs to be collected.Here are some commonly used annotations:
1. @countted: The number of calls used to calculate a specific method.
2. @Timed: The execution time for measuring a specific method.
3. @gauge: The current value of the return value or field for disclosure of a specific method.
4. @Metered: The number of executions per second and the average execution time used to measure a specific method.
In addition to annotations, the Microprofile Metrics API also provides some interfaces and classes for creating and operating measurement indicators.Developers can use these APIs to define and organize measurement data to meet their own needs.
Below is a simple example, showing how to use Microprofile Metrics API to collect and public call methods::
import org.eclipse.microprofile.metrics.MetricRegistry;
import org.eclipse.microprofile.metrics.annotation.Counted;
public class ExampleClass {
private static final MetricRegistry metricRegistry = MetricRegistry.getDefault();
@Counted(name = "exampleMethodCount")
public void exampleMethod() {
// method logic here
}
public static void main(String[] args) {
ExampleClass example = new ExampleClass();
example.exampleMethod();
long count = metricRegistry.getCounters().get("exampleMethodCount").getCount();
System.out.println("exampleMethod has been called " + count + " times.");
}
}
In the above examples, the annotation of `@Countted` is used to mark the method of labeling` ExampleMethod (). Each time the method is called, the related counter will automatically increase.You can obtain the created counter objects through the `metricRegistry`, and obtain the count value through the method of the` GetCount () `method.
Microprofile Metrics API provides more annotations and interfaces to support more complicated measurement needs, such as aggregation and histogram.Developers can choose the appropriate measurement method according to their own application needs, and make problem diagnosis, performance optimization and decision -making based on the measurement data.
