org.jboss.msc.service

Class ValueService<T>

java.lang.Object

org.jboss.msc.service.ValueService<T>

Type Parameters:

T - the service type

All Implemented Interfaces:

Service<T>, Value<T>

public final class ValueService<T>
extends java.lang.Object
implements Service<T>

A service which returns the provided value, which is evaluated once per service start.

Field Summary

Fields

Modifier and Type	Field and Description
private Value<T>	value
private T	valueInstance

Fields inherited from interface org.jboss.msc.service.Service

NULL, NULL_VALUE

Constructor Summary

Constructors

Constructor and Description
ValueService(Value<T> value) Construct a new instance.

Method Summary

Modifier and Type	Method and Description
T	getValue() Get the actual value.
void	start(StartContext context) Start the service.
void	stop(StopContext context) Stop the service.

Methods inherited from class java.lang.Object

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

Field Detail

value

private final Value<T> value

valueInstance

private volatile T valueInstance

Constructor Detail

ValueService

public ValueService(Value<T> value)

Construct a new instance.

Parameters:

value - the value to return

Method Detail

start

public void start(StartContext context)
           throws StartException

Start the service. Do not return until the service has been fully started, unless an asynchronous service start is performed. All injections will be complete before this method is called.

If the service start involves any activities that may block, the asynchronous mechanism provided by the context should be used. See the class javadoc for details.

Specified by:

start in interface Service<T>

Parameters:

context - the context which can be used to trigger an asynchronous service start

Throws:

StartException - if the service could not be started for some reason

stop

public void stop(StopContext context)

Stop the service. Do not return until the service has been fully stopped, unless an asynchronous service stop is performed. All injections will remain intact until the service is fully stopped. This method should not throw an exception.

If the service start involves any activities that may block, the asynchronous mechanism provided by the context should be used. See the class javadoc for details.

Specified by:

stop in interface Service<T>

Parameters:

context - the context which can be used to trigger an asynchronous service stop

getValue

public T getValue()
           throws java.lang.IllegalStateException

Get the actual value.

Specified by:

getValue in interface Value<T>

Returns:

the actual value

Throws:

java.lang.IllegalStateException - if the value is time-sensitive and the current state does not allow retrieval.