io.dropwizard.health.conf.response.HealthServletFactory Maven / Gradle / Ivy

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Provides a health check implementation that performs ongoing monitoring of an application's dependencies and includes an endpoint that can be called by a load balancer to determine if the application is healthy and thus able to retrieve traffic.

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package io.dropwizard.health.conf.response;

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import io.dropwizard.jackson.Discoverable;

import java.util.concurrent.atomic.AtomicBoolean;

import javax.servlet.http.HttpServlet;

/**
 * A factory for building an {@link HttpServlet} instance used for responding to health check requests.
 *
 * @see DefaultHealthServletFactory
 */
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type", defaultImpl = DefaultHealthServletFactory.class)
public interface HealthServletFactory extends Discoverable {
    /**
     * Build a servlet for responding to health check requests (e.g. from load balancer).
     *
     * @param isHealthy a flag indicating whether the application is healthy or not
     * @return a {@link HttpServlet} that responds to health check requests
     */
    HttpServlet build(final AtomicBoolean isHealthy);
}