4.4. MicroProfile Health の開発

import org.eclipse.microprofile.health.HealthCheck;
import org.eclipse.microprofile.health.HealthCheckResponse;
import org.eclipse.microprofile.health.Liveness;

import javax.enterprise.context.ApplicationScoped;

@Liveness
@ApplicationScoped
public class HealthTest implements HealthCheck {

    @Override
    public HealthCheckResponse call() {
        return HealthCheckResponse.named("health-test").up().build();
    }
}

[standalone@localhost:9990 /] /subsystem=microprofile-health-smallrye:check
{
    "outcome" => "success",
    "result" => {
        "status" => "UP",
        "checks" => [
            {
                "name" => "deployments-status",
                "status" => "UP",
                "data" => {"<deployment_name>.war" => "OK"}
            },
            {
                "name" => "server-state",
                "status" => "UP",
                "data" => {"value" => "running"}
            },
            {
                "name" => "boot-errors",
                "status" => "UP"
            },
            {
                "name" => "health-test",
                "status" => "UP"
            },
            {
                "name" => "ready-deployment.<deployment_name>.war,
                "status" => "UP"
            },
            {
                "name" => "started-deployment.<deployment_name>.war",
                "status" => "UP"
            }
        ]
    }
}

@Liveness
@ApplicationScoped
public class DataHealthCheck implements HealthCheck {

    @Override
    public HealthCheckResponse call() {
        return HealthCheckResponse.named("Health check with data")
            .up()
            .withData("foo", "fooValue")
            .withData("bar", "barValue")
            .build();
    }
}

@Readiness
@ApplicationScoped
public class DatabaseConnectionHealthCheck implements HealthCheck {

    @Inject
    @ConfigProperty(name = "database.up", defaultValue = "false")
    private boolean databaseUp;

    @Override
    public HealthCheckResponse call() {

        HealthCheckResponseBuilder responseBuilder = HealthCheckResponse.named("Database connection health check");

        try {
            simulateDatabaseConnectionVerification();
            responseBuilder.up();
        } catch (IllegalStateException e) {
            // cannot access the database
            responseBuilder.down()
                .withData("error", e.getMessage()); // pass the exception message
        }

        return responseBuilder.build();
    }

    private void simulateDatabaseConnectionVerification() {
        if (!databaseUp) {
            throw new IllegalStateException("Cannot contact database");
        }
    }
}

@Startup
@ApplicationScoped
public class StartupHealthCheck implements HealthCheck {

    @Override
    public HealthCheckResponse call() {
        return HealthCheckResponse.up("Application started");
    }
}