Realize Microservices monitoring through Spring Boot Actor, including health checks, metrics, etc
Maven coordinates of dependent class libraries:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
This class library is a plugin provided by Spring Boot that can be used to monitor and manage applications. It provides a set of HTTP interfaces through which various monitoring information of the application can be obtained, such as health status, metrics, configuration information, etc.
The following is a complete example to demonstrate how to use the Spring Boot Actor to implement Microservices monitoring:
1. Create a Spring Boot application and add dependent class libraries.
2. Create a Java class as the entry point for the application, such as' DemoApplication '.
3. Add annotation '@ SpringBootApplication' on the 'DemoApplication' class.
4. Create a Java class as the endpoint for health checks, such as' MyHealthEndpoint '.
5. Add annotations' @ RestController 'and' @ Endpoint 'on the' MyHealthEndpoint 'class.
6. In the 'MyHealthEndpoint' class, add a method as the HTTP interface for health checking, such as the 'healthCheck()' method. The method body can return custom health information.
7. Create a Java class as the configuration class for the application, such as' MyConfig '.
8. In the 'MyConfig' class, use the '@ Bean' annotation to define an instance of 'MyHealthEndpoint' and add it as an Endpoint to the Actor.
9. Run the application and access the '/actuator/health' interface to obtain the results of the health check.
The complete Java code is as follows:
// DemoApplication.java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
// MyHealthEndpoint.java
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@Endpoint(id = "customhealth")
public class MyHealthEndpoint implements HealthIndicator {
@Override
public Health health() {
//Customize the logic of health checks
boolean isHealthy = true;
if (isHealthy) {
return Health.up().withDetail("message", "Application is up and running.").build();
} else {
return Health.down().withDetail("message", "Application is not healthy.").build();
}
}
@ReadOperation
@GetMapping("/health")
public Health healthCheck() {
return health();
}
}
// MyConfig.java
import org.springframework.boot.actuate.autoconfigure.endpoint.condition.ConditionalOnAvailableEndpoint;
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.EndpointExtension;
import org.springframework.boot.actuate.endpoint.annotation.WriteOperation;
import org.springframework.boot.actuate.endpoint.web.WebEndpointHttpMethod;
import org.springframework.boot.actuate.health.HealthEndpoint;
import org.springframework.boot.actuate.health.HealthStatusHttpMapper;
import org.springframework.boot.actuate.health.Status;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration(proxyBeanMethods = false)
public class MyConfig {
@Bean
@ConditionalOnAvailableEndpoint
@Endpoint(id = "health")
public MyHealthEndpoint myHealthEndpoint() {
return new MyHealthEndpoint();
}
@Bean
@ConditionalOnAvailableEndpoint
@EndpointExtension(endpoint = HealthEndpoint.class)
public static class MyHealthEndpointExtension {
private final MyHealthEndpoint delegate;
private final HealthStatusHttpMapper httpMapper;
public MyHealthEndpointExtension(MyHealthEndpoint delegate, HealthStatusHttpMapper httpMapper) {
this.delegate = delegate;
this.httpMapper = httpMapper;
}
@WriteOperation
public void setStatus(Status status) {
if (Status.UP.equals(status)) {
delegate.setHealthy(true);
} else {
delegate.setHealthy(false);
}
}
@WriteOperation(method = WebEndpointHttpMethod.POST)
public void setHealthyStatus(@Selector Status status) {
if (Status.UP.equals(status)) {
delegate.setHealthy(true);
} else {
delegate.setHealthy(false);
}
}
}
}
Summary:
The Spring Boot Actuator is a powerful plug-in that can easily monitor and manage Microservices. Through simple configuration and customization, we can easily achieve functions such as health checks and measurement indicators. In addition, the actuator also provides other rich functions and extension points, such as displaying and modifying configuration information, monitoring threads and memory, and so on. By using the Spring Boot Actuator, we can quickly build highly available and easy to manage Microservices applications.
