Class ExistingInstanceDescriptor<T>

java.lang.Object

io.helidon.service.registry.ExistingInstanceDescriptor<T>

Type Parameters:

T - type of the instance

All Implemented Interfaces:

Weighted, ServiceDescriptor<T>, ServiceInfo, Comparable<Weighted>

public final class ExistingInstanceDescriptor<T>
extends Object
implements ServiceDescriptor<T>

A special case service descriptor allowing registration of service instances that do not have a code generated service descriptor, such as for testing.

Note that these instances cannot be used for creating code generated binding, as they do not exist as classes.

Field Summary

Fields inherited from interface Weighted

DEFAULT_WEIGHT

Modifier and Type	Field	Description
static final double	DEFAULT_WEIGHT	Default weight for any weighted component (whether it implements this interface or uses Weight annotation).

Method Summary

Modifier and Type	Method	Description
Set<ResolvedType>	contracts()	Set of contracts the described service implements or provides through a factory method.
static <T> ExistingInstanceDescriptor<T>	create(T instance, Collection<Class<? super T>> contracts, double weight)	Create a new instance.
TypeName	descriptorType()	Type of the service descriptor (usually generated).
boolean	equals(Object o)
int	hashCode()
Object	instantiate(DependencyContext ctx, InterceptionMetadata metadata)	Create a new service instance.
TypeName	serviceType()	Type of the service this descriptor describes.
String	toString()
double	weight()	Weight of this class (maybe because it is defined dynamically, so it cannot be defined by an annotation).

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface ServiceDescriptor

inject, postConstruct, preDestroy, scope, typeSet

Modifier and Type	Method	Description
default void	inject(DependencyContext ctx, InterceptionMetadata interceptionMetadata, Set<String> injected, T instance)	Inject fields and methods.
default void	postConstruct(T instance)	Invoke Service.PostConstruct annotated method(s).
default void	preDestroy(T instance)	Invoke Service.PreDestroy annotated method(s).
default TypeName	scope()	Scope of this service.
default Set<ResolvedType>	typeSet(ResolvedType contract)	Provide a mapping of a contracts of this service to its contract type set.

Methods inherited from interface ServiceInfo

dependencies, factoryContracts, factoryType, isAbstract, providedType, qualifiers, runLevel

Modifier and Type	Method	Description
default List<Dependency>	dependencies()	List of dependencies required by this service.
default Set<ResolvedType>	factoryContracts()	Set of contracts that identify the factory provider itself.
default FactoryType	factoryType()	What factory type is the described service.
default boolean	isAbstract()	Returns true for abstract classes and interfaces, returns false by default.
default TypeName	providedType()	The type that implements ServiceInfo.contracts().
default Set<Qualifier>	qualifiers()	Service qualifiers.
default Optional<Double>	runLevel()	Run level of this service.

Methods inherited from interface Weighted

compareTo

Modifier and Type	Method	Description
default int	compareTo(Weighted o)

Method Details

create

public static <T> ExistingInstanceDescriptor<T> create(T instance,
 Collection<Class<? super T>> contracts,
 double weight)

Create a new instance. The only place this can be used at is with ServiceRegistryConfig.BuilderBase.addServiceDescriptor(io.helidon.service.registry.ServiceDescriptor).

Type Parameters:

T - type of the service

Parameters:

instance - service instance to use

contracts - contracts of the service (the ones we want service registry to use)

weight - weight of the service

Returns:

a new service descriptor for the provided information

serviceType

public TypeName serviceType()

Description copied from interface: ServiceInfo

Type of the service this descriptor describes.

Specified by:

serviceType in interface ServiceInfo

Returns:

service type

descriptorType

public TypeName descriptorType()

Description copied from interface: ServiceInfo

Type of the service descriptor (usually generated).

Specified by:

descriptorType in interface ServiceInfo

Returns:

descriptor type

contracts

public Set<ResolvedType> contracts()

Description copied from interface: ServiceInfo

Set of contracts the described service implements or provides through a factory method.

Specified by:

contracts in interface ServiceInfo

Returns:

set of contracts

instantiate

public Object instantiate(DependencyContext ctx,
 InterceptionMetadata metadata)

Description copied from interface: ServiceDescriptor

Create a new service instance.

Specified by:

instantiate in interface ServiceDescriptor<T>

Parameters:

ctx - dependency context with all dependencies of this service

metadata - metadata handler for interception

Returns:

a new instance, must be of the type T or a subclass

weight

public double weight()

Description copied from interface: Weighted

Weight of this class (maybe because it is defined dynamically, so it cannot be defined by an annotation). If not dynamic, you can use the Weight annotation rather than implementing this interface as long as it is supported by the library using this Weighted.

Specified by:

weight in interface Weighted

Returns:

the weight of this service, must be a non-negative number

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object