Class ServiceLocatorFactory

  • Direct Known Subclasses:
    ServiceLocatorFactoryImpl

    public abstract class ServiceLocatorFactory
    extends java.lang.Object
    This factory can be used to create new named ServiceLocators
    • Constructor Detail

      • ServiceLocatorFactory

        public ServiceLocatorFactory()
    • Method Detail

      • getInstance

        public static ServiceLocatorFactory getInstance()
        This will return a factory where the ServiceLocatorGenerator is discovered from the META-INF/services of the process
        Returns:
        The factory to use to create service locators
      • create

        public abstract ServiceLocator create​(java.lang.String name)
        Creates (or finds) a ServiceLocator.

        If there is already a ServiceLocator with the given name then this method will return that locator.

        Parameters:
        name - The name of this service locator. Passing a null name will result in a newly created service locator with a generated name and that will not be tracked by the system
        Returns:
        The created or found named ServiceLocator
      • create

        public abstract ServiceLocator create​(java.lang.String name,
                                              ServiceLocator parent)
        Creates or finds a ServiceLocator.

        If there is already a ServiceLocator with the given name then this method will return that ServiceLocator. The parent argument will be ignored in that case

        Parameters:
        name - The name of this service locator. Passing a null name will result in a newly created service locator with a generated name and that will not be tracked by the system
        parent - The parent of this ServiceLocator. Services can be found in the parent (and all grand-parents). May be null if the returned ServiceLocator should not be parented
        Returns:
        The created or found named ServiceLocator
      • create

        public abstract ServiceLocator create​(java.lang.String name,
                                              ServiceLocator parent,
                                              ServiceLocatorGenerator generator)
        Creates or finds a ServiceLocator.

        If there is already a ServiceLocator with the given name then this method will return that ServiceLocator. The parent argument will be ignored in that case. If a null name is given then a new ServiceLocator with a generated name will be returned.

        Parameters:
        name - The name of this service locator. Passing a null name will result in a newly created service locator with a generated name and that will not be tracked by the system
        parent - The parent of this ServiceLocator. Services can be found in the parent (and all grand-parents). May be null if the returned ServiceLocator should not be parented
        generator - An implementation of the generator interface that can be used to provide an implementation of ServiceLocator. If null then the generator used will be discovered from the OSGi service registry or from META-INF/services
        Returns:
        The created or found named ServiceLocator
      • create

        public abstract ServiceLocator create​(java.lang.String name,
                                              ServiceLocator parent,
                                              ServiceLocatorGenerator generator,
                                              ServiceLocatorFactory.CreatePolicy policy)
        Creates a ServiceLocator.

        If there is already a ServiceLocator with the given name then this method will honor the given CreatePolicy. return that ServiceLocator. The policies are

        • RETURN: Return the existing locator
        • DESTOY: Destroy the existing locator
        • ERROR: Throw an IllegalStateException exception
        Parameters:
        name - The name of this service locator. Passing a null name will result in a newly created service locator with a generated name and that will not be tracked by the system
        parent - The parent of this ServiceLocator. Services can be found in the parent (and all grand-parents). May be null if the returned ServiceLocator should not be parented
        generator - An implementation of the generator interface that can be used to provide an implementation of ServiceLocator. If null then the generator used will be discovered from the OSGi service registry or from META-INF/services
        policy - The policy that should be used if there is an existing locator with the non-null name. If null the policy of RETURN will be used
        Returns:
        The created or found named ServiceLocator
      • find

        public abstract ServiceLocator find​(java.lang.String name)
        Finds the ServiceLocator with this name
        Parameters:
        name - May not be null, is the name of the ServiceLocator to find
        Returns:
        The ServiceLocator with the given name, or null if there is no ServiceLocator with that name
      • destroy

        public abstract void destroy​(java.lang.String name)
        Removes the ServiceLocator with this name

        All services associated with this ServiceLocator will be shutdown

        Parameters:
        name - The name of the ServiceLocator to destroy
      • destroy

        public abstract void destroy​(ServiceLocator locator)
        Removes the given ServiceLocator

        All services associated with this ServiceLocator will be shutdown

        Parameters:
        locator - The ServiceLocator to destroy. If null this will do nothing. If the ServiceLocator given was already destroyed this will do nothing
      • addListener

        public abstract void addListener​(ServiceLocatorListener listener)
        Adds a service listener to the unordered set of listeners that will be notified when named listeners are added or removed from the system. If this listener is already registered this method does nothing
        Parameters:
        listener - The non-null listener to add to the system
      • removeListener

        public abstract void removeListener​(ServiceLocatorListener listener)
        Removes a service listener from the set of listeners that are notified when named listeners are added or removed from the system
        Parameters:
        listener - The non-null listener to remove from the system