Package org.apache.felix.framework

Class ServiceRegistry

java.lang.Object

org.apache.felix.framework.ServiceRegistry

public class ServiceRegistry
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	ServiceRegistry.ServiceHolder
static interface	ServiceRegistry.ServiceRegistryCallbacks
(package private) static class	ServiceRegistry.UsageCount

Field Summary

Fields

Modifier and Type	Field	Description
private final HookRegistry	hookRegistry
private final ServiceRegistry.ServiceRegistryCallbacks	m_callbacks
private final AtomicLong	m_currentServiceId	Counter for the service id
private final ConcurrentMap<Bundle,ServiceRegistry.UsageCount[]>	m_inUseMap
private final Logger	m_logger
private final CapabilitySet	m_regCapSet
private final ConcurrentMap<Bundle,List<ServiceRegistration<?>>>	m_regsMap

Constructor Summary

Constructors

Constructor	Description
ServiceRegistry(Logger logger, ServiceRegistry.ServiceRegistryCallbacks callbacks)

Method Summary

Modifier and Type	Method	Description
private void	checkCountOverflow(long c)
(package private) void	flushUsageCount(Bundle bundle, ServiceReference<?> ref, ServiceRegistry.UsageCount uc)	Utility method to flush the specified bundle's usage count for the specified service reference.
HookRegistry	getHookRegistry()
Logger	getLogger()
ServiceReference<?>[]	getRegisteredServices(Bundle bundle)	Get all service references for a bundle
<S> S	getService(Bundle bundle, ServiceReference<S> ref, boolean isServiceObjects)
Collection<ServiceReference<?>>	getServiceReferences(String className, SimpleFilter filter)
ServiceReference<?>[]	getServicesInUse(Bundle bundle)
Bundle[]	getUsingBundles(ServiceReference<?> ref)
private void	incrementToPositiveValue(AtomicLong al)
(package private) ServiceRegistry.UsageCount	obtainUsageCount(Bundle bundle, ServiceReference<?> ref, Object svcObj, Boolean isPrototype)	Obtain a UsageCount object, by looking for an existing one or creating a new one (if possible).
ServiceRegistration<?>	registerService(Bundle bundle, String[] classNames, Object svcObj, Dictionary<?,?> dict)	Register a new service Caller must fire service event as this method is not doing it!
(package private) void	servicePropertiesModified(ServiceRegistration<?> reg, Dictionary<String,?> oldProps)
boolean	ungetService(Bundle bundle, ServiceReference<?> ref, Object svcObj)
void	ungetServices(Bundle bundle)	This is a utility method to release all services being used by the specified bundle.
private void	ungetServices(ServiceReference<?> ref)
void	unregisterService(Bundle bundle, ServiceRegistration<?> reg)	Unregister a service
void	unregisterServices(Bundle bundle)	This method retrieves all services registrations for the specified bundle and invokes ServiceRegistration.unregister() on each one.

Methods inherited from class java.lang.Object

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

Field Details

m_logger

private final Logger m_logger

m_currentServiceId

private final AtomicLong m_currentServiceId

Counter for the service id

m_regsMap

private final ConcurrentMap<Bundle,List<ServiceRegistration<?>>> m_regsMap

m_regCapSet

private final CapabilitySet m_regCapSet

m_inUseMap

private final ConcurrentMap<Bundle,ServiceRegistry.UsageCount[]> m_inUseMap

m_callbacks

private final ServiceRegistry.ServiceRegistryCallbacks m_callbacks

hookRegistry

private final HookRegistry hookRegistry

Constructor Details

ServiceRegistry

public ServiceRegistry(Logger logger,
 ServiceRegistry.ServiceRegistryCallbacks callbacks)

Method Details

getRegisteredServices

public ServiceReference<?>[] getRegisteredServices(Bundle bundle)

Get all service references for a bundle

Parameters:

bundle -

Returns:

List with all valid service references or null.

registerService

public ServiceRegistration<?> registerService(Bundle bundle,
 String[] classNames,
 Object svcObj,
 Dictionary<?,?> dict)

Register a new service Caller must fire service event as this method is not doing it!

Parameters:

bundle - The bundle registering the service

classNames - The service class names

svcObj - The service object

dict - Optional service properties

Returns:

Service registration

unregisterService

public void unregisterService(Bundle bundle,
 ServiceRegistration<?> reg)

Unregister a service

Parameters:

bundle - The bundle unregistering the service

reg - The service registration

ungetServices

private void ungetServices(ServiceReference<?> ref)

unregisterServices

public void unregisterServices(Bundle bundle)

This method retrieves all services registrations for the specified bundle and invokes ServiceRegistration.unregister() on each one. This method is only called be the framework to clean up after a stopped bundle.

Parameters:

bundle - the bundle whose services should be unregistered.

getServiceReferences

public Collection<ServiceReference<?>> getServiceReferences(String className,
 SimpleFilter filter)

getServicesInUse

public ServiceReference<?>[] getServicesInUse(Bundle bundle)

getService

public <S> S getService(Bundle bundle,
 ServiceReference<S> ref,
 boolean isServiceObjects)

incrementToPositiveValue

private void incrementToPositiveValue(AtomicLong al)

checkCountOverflow

private void checkCountOverflow(long c)

ungetService

public boolean ungetService(Bundle bundle,
 ServiceReference<?> ref,
 Object svcObj)

ungetServices

public void ungetServices(Bundle bundle)

This is a utility method to release all services being used by the specified bundle.

Parameters:

bundle - the bundle whose services are to be released.

getUsingBundles

public Bundle[] getUsingBundles(ServiceReference<?> ref)

servicePropertiesModified

void servicePropertiesModified(ServiceRegistration<?> reg,
 Dictionary<String,?> oldProps)

getLogger

public Logger getLogger()

obtainUsageCount

ServiceRegistry.UsageCount obtainUsageCount(Bundle bundle,
 ServiceReference<?> ref,
 Object svcObj,
 Boolean isPrototype)

Obtain a UsageCount object, by looking for an existing one or creating a new one (if possible). This method tries to find a UsageCount object in the m_inUseMap. If one is found then this is returned, otherwise a UsageCount object will be created, but this can only be done if the isPrototype parameter is not null. If isPrototype is TRUE then a new UsageCount object will always be created.

Parameters:

bundle - The bundle using the service.

ref - The Service Reference.

svcObj - A Service Object, if applicable.

isPrototype - TRUE if we know that this is a prototype, invalid input: '{@' FALSE} if we know that it isn't. There are cases where we don't know (the pure lookup case), in that case use null.

Returns:

The UsageCount object if it could be obtained, or null otherwise.

flushUsageCount

void flushUsageCount(Bundle bundle,
 ServiceReference<?> ref,
 ServiceRegistry.UsageCount uc)

Utility method to flush the specified bundle's usage count for the specified service reference. This should be called to completely remove the associated usage count object for the specified service reference. If the goal is to simply decrement the usage, then get the usage count and decrement its counter. This method will also remove the specified bundle from the "in use" map if it has no more usage counts after removing the usage count for the specified service reference.

Parameters:

bundle - The bundle whose usage count should be removed.

ref - The service reference whose usage count should be removed.

getHookRegistry

public HookRegistry getHookRegistry()