org.apache.hadoop.service

Class ServiceOperations

java.lang.Object

org.apache.hadoop.service.ServiceOperations

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public final class ServiceOperations
extends Object

This class contains a set of methods to work with services, especially to walk them through their lifecycle.

Method Summary

Modifier and Type	Method and Description
static void	stop(Service service) Stop a service.
static Exception	stopQuietly(org.slf4j.Logger log, Service service) Stop a service; if it is null do nothing.
static Exception	stopQuietly(org.apache.commons.logging.Log log, Service service) Stop a service; if it is null do nothing.
static Exception	stopQuietly(Service service) Stop a service; if it is null do nothing.

Methods inherited from class java.lang.Object

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

Method Detail

stop

public static void stop(Service service)

Stop a service.

Do nothing if the service is null or not in a state in which it can be/needs to be stopped.

The service state is checked before the operation begins. This process is not thread safe.

Parameters:

service - a service or null

stopQuietly

public static Exception stopQuietly(Service service)

Stop a service; if it is null do nothing. Exceptions are caught and logged at warn level. (but not Throwables). This operation is intended to be used in cleanup operations

Parameters:

service - a service; may be null

Returns:

any exception that was caught; null if none was.

stopQuietly

public static Exception stopQuietly(org.apache.commons.logging.Log log,
                                    Service service)

Stop a service; if it is null do nothing. Exceptions are caught and logged at warn level. (but not Throwables). This operation is intended to be used in cleanup operations

Parameters:

log - the log to warn at

service - a service; may be null

Returns:

any exception that was caught; null if none was.

See Also:

stopQuietly(Service)

stopQuietly

public static Exception stopQuietly(org.slf4j.Logger log,
                                    Service service)

Stop a service; if it is null do nothing. Exceptions are caught and logged at warn level. (but not Throwables). This operation is intended to be used in cleanup operations

Parameters:

log - the log to warn at

service - a service; may be null

Returns:

any exception that was caught; null if none was.

See Also:

stopQuietly(Service)