uk.ac.ed.epcc.webapp.config

Class CachedConfigService

java.lang.Object

uk.ac.ed.epcc.webapp.config.CachedConfigService

All Implemented Interfaces:

AppContextCleanup, AppContextService<ConfigService>, ConfigService, Contexed

public class CachedConfigService
extends java.lang.Object
implements ConfigService

Cache Properties in a global static variable. This can be turned off with configuration parameters but it has to be done within this class to make sure that the queries to the underlying services to check the feature are not made when the cache IS active. The dependencies between this and the DataBaseConfigService are very fragile so edit this at your own peril.

Field Summary

Fields

Modifier and Type	Field and Description
static Feature	CACHED_CONFIG_FEATURE

Constructor Summary

Constructors

Constructor and Description
CachedConfigService(AppContext c)

Method Summary

Modifier and Type	Method and Description
void	addListener(ConfigServiceListener listener) register a ConfigServiceListener
void	cleanup() AppContext is being closed.
void	clearServiceProperties() clear any cached properties.
AppContext	getContext()
java.util.Properties	getServiceProperties() return the set of properties defined by the service
java.lang.Class<ConfigService>	getType() Returns the type of service the class should be registered under.
static void	invalidate()
void	setProperty(java.lang.String name, java.lang.String value) Set a property This method is for making persistent changes to the configuration.

Methods inherited from class java.lang.Object

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

Field Detail

CACHED_CONFIG_FEATURE

public static final Feature CACHED_CONFIG_FEATURE

Constructor Detail

CachedConfigService

public CachedConfigService(AppContext c)

Method Detail

clearServiceProperties

public void clearServiceProperties()

Description copied from interface: ConfigService

clear any cached properties. This will cause the properties to be re-read the next time getServiceProperties is called. Implementations are permitted not to cache data in which case this is a No-op.

Specified by:

clearServiceProperties in interface ConfigService

invalidate

public static void invalidate()

getServiceProperties

public java.util.Properties getServiceProperties()

Description copied from interface: ConfigService

return the set of properties defined by the service

Specified by:

getServiceProperties in interface ConfigService

Returns:

Properties

getContext

public AppContext getContext()

Specified by:

getContext in interface Contexed

setProperty

public void setProperty(java.lang.String name,
                        java.lang.String value)
                 throws java.lang.UnsupportedOperationException

Description copied from interface: ConfigService

Set a property This method is for making persistent changes to the configuration. if the service is not capable of making persistent changes it should forward the request to a nested service or throw an UnsupportedOperationException

Specified by:

setProperty in interface ConfigService

Throws:

java.lang.UnsupportedOperationException

cleanup

public void cleanup()

Description copied from interface: AppContextCleanup

AppContext is being closed. Only use this for cleanup that can't be handled by normal garbage collection or for state which is never returned by reference.

Specified by:

cleanup in interface AppContextCleanup

addListener

public void addListener(ConfigServiceListener listener)

Description copied from interface: ConfigService

register a ConfigServiceListener

Specified by:

addListener in interface ConfigService

getType

public java.lang.Class<ConfigService> getType()

Description copied from interface: AppContextService

Returns the type of service the class should be registered under.

Specified by:

getType in interface AppContextService<ConfigService>

Returns:

registration type