Package io.vertx.ext.web.healthchecks

Interface HealthCheckHandler

All Superinterfaces:

Handler<RoutingContext>

public interface HealthCheckHandler
extends Handler<RoutingContext>

A Vert.x Web handler on which you register health check procedure. It computes the outcome status (`UP` or `DOWN`) . When the handler process an HTTP request, it computes the global outcome and build a HTTP response as follows:

• 204 - status is `UP` but no procedures installed (no payload)
• 200 - status is `UP`, the payload contains the result of the installed procedures
• 503 - status is `DOWN`, the payload contains the result of the installed procedures
• 500 - status is `DOWN`, the payload contains the result of the installed procedures, one of the procedure has failed

Author:

Clement Escoffier

Method Summary

Modifier and Type	Method	Description
static HealthCheckHandler	create(Vertx vertx)	Creates an instance of the default implementation of the HealthCheckHandler.
static HealthCheckHandler	create(Vertx vertx, AuthenticationProvider provider)	Creates an instance of the default implementation of the HealthCheckHandler.
static HealthCheckHandler	createWithHealthChecks(HealthChecks hc)	Creates an instance of the default implementation of the HealthCheckHandler.
static HealthCheckHandler	createWithHealthChecks(HealthChecks hc, AuthenticationProvider provider)	Creates an instance of the default implementation of the HealthCheckHandler.
HealthCheckHandler	register(String name, long timeout, Handler<Promise<Status>> procedure)	Registers a health check procedure.
HealthCheckHandler	register(String name, Handler<Promise<Status>> procedure)	Registers a health check procedure.
HealthCheckHandler	resultMapper(java.util.function.Function<CheckResult,Future<CheckResult>> resultMapper)	Sets a function which will be invoked before the CheckResult gets written to clients.
HealthCheckHandler	unregister(String name)	Unregisters a procedure.

Methods inherited from interface io.vertx.core.Handler

handle

Method Detail

create

static HealthCheckHandler create(Vertx vertx,
                                 AuthenticationProvider provider)

Creates an instance of the default implementation of the HealthCheckHandler. This function creates a new instance of HealthChecks.

Parameters:

vertx - the Vert.x instance, must not be null

provider - the Authentication provider used to authenticate the HTTP request

Returns:

the created instance

create

static HealthCheckHandler create(Vertx vertx)

Creates an instance of the default implementation of the HealthCheckHandler. This function creates a new instance of HealthChecks.

Parameters:

vertx - the Vert.x instance, must not be null

Returns:

the created instance

createWithHealthChecks

static HealthCheckHandler createWithHealthChecks(HealthChecks hc,
                                                 AuthenticationProvider provider)

Creates an instance of the default implementation of the HealthCheckHandler.

Parameters:

hc - the health checks object to use, must not be null

Returns:

the created instance

createWithHealthChecks

static HealthCheckHandler createWithHealthChecks(HealthChecks hc)

Creates an instance of the default implementation of the HealthCheckHandler.

Parameters:

hc - the health checks object to use

Returns:

the created instance

register

HealthCheckHandler register(String name,
                            Handler<Promise<Status>> procedure)

Registers a health check procedure.

The procedure is a Handler taking a Promise of Status as parameter. Procedures are asynchronous, and must complete or fail the given Promise. If the future object is failed, the procedure outcome is considered as `DOWN`. If the future is completed without any object, the procedure outcome is considered as `UP`. If the future is completed with a (not-null) Status, the procedure outcome is the received status.

This method uses a 1s timeout. To configure the timeout use register(String, long, Handler).

Parameters:

name - the name of the procedure, must not be null or empty

procedure - the procedure, must not be null

Returns:

the current HealthCheckHandler

register

HealthCheckHandler register(String name,
                            long timeout,
                            Handler<Promise<Status>> procedure)

Registers a health check procedure.

The procedure is a Handler taking a Promise of Status as parameter. Procedures are asynchronous, and must complete or fail the given Promise. If the future object is failed, the procedure outcome is considered as `DOWN`. If the future is completed without any object, the procedure outcome is considered as `UP`. If the future is completed with a (not-null) Status, the procedure outcome is the received status.

Parameters:

name - the name of the procedure, must not be null or empty

timeout - the procedure timeout

procedure - the procedure, must not be null

Returns:

the current HealthCheckHandler

unregister

HealthCheckHandler unregister(String name)

Unregisters a procedure.

Parameters:

name - the name of the procedure

Returns:

the current HealthCheckHandler

resultMapper

HealthCheckHandler resultMapper(java.util.function.Function<CheckResult,Future<CheckResult>> resultMapper)

Sets a function which will be invoked before the CheckResult gets written to clients.

Parameters:

resultMapper - the Function used to manipulate the CheckResult, null means no result mapper function enabled.

Returns:

the current HealthCheckHandler