io.grpc.protobuf.services

Class HealthStatusManager

java.lang.Object

io.grpc.protobuf.services.HealthStatusManager

@ExperimentalApi(value="https://github.com/grpc/grpc-java/issues/4696")
public final class HealthStatusManager
extends Object

A HealthStatusManager object manages a health check service. A health check service is created in the constructor of HealthStatusManager, and it can be retrieved by the getHealthService() method. The health status manager can update the health statuses of the server.

The default, empty-string, service name, SERVICE_NAME_ALL_SERVICES, is initialized to HealthCheckResponse.ServingStatus.SERVING.

Field Summary

Fields

Modifier and Type	Field and Description
static String	SERVICE_NAME_ALL_SERVICES The special "service name" that represent all services on a GRPC server.

Constructor Summary

Constructors

Constructor and Description
HealthStatusManager() Creates a new health service instance.

Method Summary

Modifier and Type	Method and Description
void	clearStatus(String service) Clears the health status record of a service.
void	enterTerminalState() enterTerminalState causes the health status manager to mark all services as not serving, and prevents future updates to services.
BindableService	getHealthService() Gets the health check service created in the constructor.
void	setStatus(String service, HealthCheckResponse.ServingStatus status) Updates the status of the server.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SERVICE_NAME_ALL_SERVICES

public static final String SERVICE_NAME_ALL_SERVICES

The special "service name" that represent all services on a GRPC server. It is an empty string.

See Also:

Constant Field Values

Constructor Detail

HealthStatusManager

public HealthStatusManager()

Creates a new health service instance.

Method Detail

getHealthService

public BindableService getHealthService()

Gets the health check service created in the constructor.

setStatus

public void setStatus(String service,
                      HealthCheckResponse.ServingStatus status)

Updates the status of the server.

Parameters:

service - the name of some aspect of the server that is associated with a health status. This name can have no relation with the gRPC services that the server is running with. It can also be an empty String "" per the gRPC specification.

status - is one of the values HealthCheckResponse.ServingStatus.SERVING, HealthCheckResponse.ServingStatus.NOT_SERVING and HealthCheckResponse.ServingStatus.UNKNOWN.

clearStatus

public void clearStatus(String service)

Clears the health status record of a service. The health service will respond with NOT_FOUND error on checking the status of a cleared service.

Parameters:

service - the name of some aspect of the server that is associated with a health status. This name can have no relation with the gRPC services that the server is running with. It can also be an empty String "" per the gRPC specification.

enterTerminalState

public void enterTerminalState()

enterTerminalState causes the health status manager to mark all services as not serving, and prevents future updates to services. This method is meant to be called prior to server shutdown as a way to indicate that clients should redirect their traffic elsewhere.