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package org.glassfish.hk2.api;
import org.jvnet.hk2.annotations.Contract;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;
/**
* ServiceLocator is the registry for HK2 services
*
* This service is the most fundamental service in an HK2 system. Every
* service locator starts with a ServiceLocator as a service, and hence
* ServiceLocators can be injected into every object managed by HK2.
*
* A service locator can have a single parent. Services are looked up in
* the current service locator and in all the parents of the service locator.
* If multiple services exist that match the filter they will all be returned.
* Two services with the same priority are sorted first by service locator
* id and second by service id. This implies that services directly installed
* in a ServiceLocator have higher natural priority than those in the parents
* of the ServiceLocator. Services can also be marked as having visibility LOCAL,
* in which case they will only be available to the ServiceLocator performing
* the lookup, and will not leak out to children of that ServiceLocator.
*
*/
@Contract
public interface ServiceLocator {
/**
* Gets the best service from this locator that implements
* this contract or has this implementation
*
* Use this method only if destroying the service is not important
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return An instance of the contract or impl. May return
* null if there is no provider that provides the given
* implementation or contract
* @throws MultiException if there was an error during service creation
*/
public T getService(Class contractOrImpl, Annotation... qualifiers) throws MultiException;
/**
* Gets the best service from this locator that implements
* this contract or has this implementation
*
* Use this method only if destroying the service is not important
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return An instance of the contract or impl. May return
* null if there is no provider that provides the given
* implementation or contract
* @throws MultiException if there was an error during service creation
*/
public T getService(Type contractOrImpl, Annotation... qualifiers) throws MultiException;
/**
* Gets the best service from this locator that implements
* this contract or has this implementation and has the given
* name
*
* Use this method only if destroying the service is not important
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param name May be null (to indicate any name is ok), and is the name of the
* implementation to be returned
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return An instance of the contract or impl. May return
* null if there is no provider that provides the given
* implementation or contract
* @throws MultiException if there was an error during service creation
*/
public T getService(Class contractOrImpl, String name, Annotation... qualifiers) throws MultiException;
/**
* Gets the best service from this locator that implements
* this contract or has this implementation and has the given
* name
*
* Use this method only if destroying the service is not important
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param name May be null (to indicate any name is ok), and is the name of the
* implementation to be returned
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return An instance of the contract or impl. May return
* null if there is no provider that provides the given
* implementation or contract
* @throws MultiException if there was an error during service creation
*/
public T getService(Type contractOrImpl, String name, Annotation... qualifiers) throws MultiException;
/**
* Gets the all the services from this locator that implements
* this contract or has this implementation
*
* Use this method only if destroying the service is not important
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return A list of services implementing this contract
* or concrete implementation. May not return null, but
* may return an empty list
* @throws MultiException if there was an error during service creation
*/
public List getAllServices(Class contractOrImpl,
Annotation... qualifiers) throws MultiException;
/**
* Gets the all the services from this locator that implements
* this contract or has this implementation
*
* Use this method only if destroying the service is not important
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return A list of services implementing this contract
* or concrete implementation. May not return null, but
* may return an empty list
* @throws MultiException if there was an error during service creation
*/
public List getAllServices(Type contractOrImpl,
Annotation... qualifiers) throws MultiException;
/**
* Gets the all the services from this locator that has the given
* qualifier or qualifiers
*
* Use this method only if destroying the services is not important
*
* @param qualifier May not be null, and is a qualifier that must
* match the service definition
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return A list of services implementing this contract
* or concrete implementation. May not return null, but
* may return an empty list
* @throws MultiException if there was an error during service creation
*/
public List getAllServices(Annotation qualifier,
Annotation... qualifiers) throws MultiException;
/**
* Gets the all the services from this locator that matches the
* {@link Filter}
*
* Use this method only if destroying the service is not important
*
* This method should also be used with care to avoid classloading
* a large number of services
*
* @param searchCriteria The returned service will match the Filter
* (in other words, searchCriteria.matches returns true). May not
* be null
* @return A list of services matching this filter. May not return null,
* but may return an empty list
* @throws MultiException if there was an error during service creation
*/
public List getAllServices(Filter searchCriteria) throws MultiException;
/**
* Gets a {@link ServiceHandle} that can be used to get and destroy the
* service that best matches the given criteria
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return Will return root as a convenience
* @throws MultiException if there was an error during service creation
*/
public ServiceHandle getServiceHandle(Class contractOrImpl, Annotation... qualifiers) throws MultiException;
/**
* Gets a {@link ServiceHandle} that can be used to get and destroy the
* service that best matches the given criteria
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return Will return root as a convenience
* @throws MultiException if there was an error during service creation
*/
public ServiceHandle getServiceHandle(Type contractOrImpl, Annotation... qualifiers) throws MultiException;
/**
* Gets a {@link ServiceHandle} that can be used to get and destroy the
* service that best matches the given criteria
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param name The name to use to further qualify the search (may be null,
* indicating that any name will match)
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return Will the service handle for the best service matching the
* given criteria, or null if no matching service could be found
* @throws MultiException if there was an error during service creation
* @throws IllegalArgumentException if contractOrImpl is null
*/
public ServiceHandle getServiceHandle(Class contractOrImpl, String name,
Annotation... qualifiers) throws MultiException;
/**
* Gets a {@link ServiceHandle} that can be used to get and destroy the
* service that best matches the given criteria
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param name The name to use to further qualify the search (may be null,
* indicating that any name will match)
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return Will the service handle for the best service matching the
* given criteria, or null if no matching service could be found
* @throws MultiException if there was an error during service creation
* @throws IllegalArgumentException if contractOrImpl is null
*/
public ServiceHandle getServiceHandle(Type contractOrImpl, String name,
Annotation... qualifiers) throws MultiException;
/**
* Gets a list of {@link ServiceHandle} that can be used to get and destroy services
* associated with descriptors that match the provided criteria
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return A non-null but possibly empty list of service handles matching
* the given criteria
* @throws MultiException if there was an error during service creation
* @throws IllegalArgumentException if contractOrImpl is null
*/
public List> getAllServiceHandles(Class contractOrImpl,
Annotation... qualifiers) throws MultiException;
/**
* Gets a list of {@link ServiceHandle} that can be used to get and destroy services
* associated with descriptors that match the provided criteria
*
* @param contractOrImpl May not be null, and is the contract
* or concrete implementation to get the best instance of
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return A non-null but possibly empty list of service handles matching
* the given criteria
* @throws MultiException if there was an error during service creation
* @throws IllegalArgumentException if contractOrImpl is null
*/
public List> getAllServiceHandles(Type contractOrImpl,
Annotation... qualifiers) throws MultiException;
/**
* Gets a list of {@link ServiceHandle} that can be used to get and destroy services
* associated with descriptors that match the provided criteria
*
* @param qualifier May not be null, and is a qualifier that must
* match the service definition
* @param qualifiers The set of qualifiers that must match this service
* definition
* @return A non-null but possibly empty list of service handles matching
* the given criteria
* @throws MultiException if there was an error during service creation
* @throws IllegalArgumentException if contractOrImpl is null
*/
public List> getAllServiceHandles(Annotation qualifier,
Annotation... qualifiers) throws MultiException;
/**
* Gets a list of {@link ServiceHandle} whose {@link ActiveDescriptor}s match
* the supplied filter. The returned {@link ServiceHandle}s may be used to
* get or destroy the services associated with the matching descriptors
*
* @param searchCriteria A filter to use when determining which descriptors should apply
* @return A list of service handles in ranked order that match the given filter
* @throws MultiException if there was an error during service handle creation
*/
public List> getAllServiceHandles(Filter searchCriteria) throws MultiException;
/**
* Gets the list of descriptors that match the given filter
*
* @param filter A filter to use when determining which services should apply
* @return A list of descriptors in ranked order that match the given filter
*/
public List> getDescriptors(Filter filter);
/**
* Gets the descriptor that best matches this filter, taking ranking
* and service id into account
*
* @param filter The non-null filter to use to retrieve the best descriptor
* @return The best descriptor matching the filter, or null if there
* is no descriptor that matches the filter
*/
public ActiveDescriptor getBestDescriptor(Filter filter);
/**
* Converts a descriptor to an ActiveDescriptor. Will use the registered
* HK2Loaders to perform this action. If no HK2Loader is available for
* the descriptor, will use the injectee to discover a classloader
*
* @param descriptor The descriptor to convert, may not be null
* @param injectee The injectee on behalf of whom this descriptor is being injected. May
* be null if the injectee is unknown
* @return The active descriptor as loaded with the first valid {@link HK2Loader}
* @throws MultiException if there were errors when loading or analyzing the class
*/
public ActiveDescriptor reifyDescriptor(Descriptor descriptor, Injectee injectee) throws MultiException;
/**
* Converts a descriptor to an ActiveDescriptor. Will use the registered
* HK2Loaders to perform this action
*
* @param descriptor The descriptor to convert, may not be null
* @return The active descriptor as loaded with the first valid {@link HK2Loader}
* @throws MultiException if there were errors when loading or analyzing the class
*/
public ActiveDescriptor reifyDescriptor(Descriptor descriptor) throws MultiException;
/**
* This method will first find a descriptor for this injectee, and then
* reify that descriptor. If multiple descriptors are found, they will
* be reified in ranking order until an ActiveDescriptor matching the Injectee is
* found.
*
* This method is responsible for using the available {@link JustInTimeInjectionResolver}
* to add in new descriptors should the descriptor for the given injectee
* not be found initially
*
* @param injectee the injection point for whom to find the ActiveDescriptor
* @return The active descriptor for this injection point
* @throws MultiException if there were errors when loading or analyzing the class
*/
public ActiveDescriptor getInjecteeDescriptor(Injectee injectee) throws MultiException;
/**
* Gets a {@link ServiceHandle} that can be used to get and destroy the service
* described by the {@link ActiveDescriptor}. The injectee may be used to discover
* the proper classloader to use when attempting to reify the {@link ActiveDescriptor}
*
* @param activeDescriptor The descriptor for which to create a {@link ServiceHandle}.
* May not be null
* @param injectee The injectee on behalf of whom this service is being injected. May
* be null if the injectee is unknown
* @return A {@link ServiceHandle} that may be used to create or destroy the service
* associated with this {@link ActiveDescriptor}
* @throws MultiException if there was an error during service handle creation
*/
public ServiceHandle getServiceHandle(ActiveDescriptor activeDescriptor, Injectee injectee) throws MultiException;
/**
* Gets a {@link ServiceHandle} that can be used to get and destroy the service
* described by the {@link ActiveDescriptor}.
*
* @param activeDescriptor The descriptor for which to create a {@link ServiceHandle}.
* May not be null
* @return A {@link ServiceHandle} that may be used to create or destroy the service
* associated with this {@link ActiveDescriptor}
* @throws MultiException if there was an error during service handle creation
*/
public ServiceHandle getServiceHandle(ActiveDescriptor activeDescriptor) throws MultiException;
/**
* This method should be called by code resolving injectee's on behalf of some
* root service, usually by an implementation of {@link InjectionResolver#resolve(Injectee, ServiceHandle)}. In
* this way the objects associated with the root object can be destroyed in the proper sequence
*
* @param activeDescriptor The descriptor whose service to create
* @param root The ultimate parent of this service creation. May be null
* @return The service matching this descriptor
* @throws MultiException if there was an error during service creation
* @deprecated use {@link ServiceLocator#getService(ActiveDescriptor, ServiceHandle, Injectee)}
*/
@Deprecated
public T getService(ActiveDescriptor activeDescriptor, ServiceHandle root) throws MultiException;
/**
* This method should be called by code resolving injectee's on behalf of some
* root service, usually by an implementation of {@link InjectionResolver#resolve(Injectee, ServiceHandle)}. In
* this way the objects associated with the root object can be destroyed in the proper sequence
*
* @param activeDescriptor The descriptor whose service to create
* @param root The ultimate parent of this service creation. May be null
* @param injectee The injectee passed into the {@link InjectionResolver#resolve(Injectee, ServiceHandle)} if known,
* null otherwise
* @return The service matching this descriptor
* @throws MultiException if there was an error during service creation
*/
public T getService(ActiveDescriptor activeDescriptor, ServiceHandle root, Injectee injectee) throws MultiException;
/**
* Gets the name of the default class analyzer service
*
* @return The name of the default class analyzer. Will not return null
*/
public String getDefaultClassAnalyzerName();
/**
* Sets the name of the default class analyzer that should be used for all
* {@link Descriptor}s that return null as their class analyzer. If null is given
* then the default class analyzer name of {@link ClassAnalyzer#DEFAULT_IMPLEMENTATION_NAME}
* will be used
*
* @param defaultClassAnalyzer The possibly null name of the default class
* analyzer (the class analyzer that will be used if a descriptor has not
* explicitly set the name of its class analyzer)
*/
public void setDefaultClassAnalyzerName(String defaultClassAnalyzer);
/**
* Returns the name of this ServiceLocator
* @return The name of this ServiceLocator, will not return null
*/
public String getName();
/**
* This returns the unique locator ID for this locator. The locator ID will
* be assigned at the time of creation and must be a monotonacally increasing
* number (starting at zero)
* @return The identifier for this service locator
*/
public long getLocatorId();
/**
* Gets the parent service locator for this locator
*
* @return The parent service locator for this locator, or null if this
* service locator does not have a parent
*/
public ServiceLocator getParent();
/**
* This method will shutdown every service associated with this ServiceLocator.
* Those services that have a preDestroy shall have their preDestroy called
*/
public void shutdown();
/**
* Returns the current state of this service locator. This method will work
* in all service locator states
*
* @return The current state of the service locator
*/
public ServiceLocatorState getState();
/**
* This returns the value of neutralContextClassLoader. If
* this value is true then HK2 will ensure that the context
* class loader on the thread is maintained whenever hk2 calls
* into user code. If this value is false then the value of
* the context class loader on the thread may be changed by
* the code hk2 is calling.
*
* When set to false this value is used to increase performance
* since getting and setting the context class loader can be expensive.
* However, if the user code being called by hk2 may change the context
* class loader of the thread, this value should be true to ensure that
* tricky and hard to find bugs don't arise when this thread is used for
* other purposes later on
*
* All new ServiceLocator implementation have this value initially set
* to true
* @return If true hk2 will ensure that the context class loader cannot
* be changed by user code. If false hk2 will not modify the context
* class loader of the thread when user code has finished
*/
public boolean getNeutralContextClassLoader();
/**
* This sets the value of neutralContextClassLoader. If
* this value is true then HK2 will ensure that the context
* class loader on the thread is maintained whenever hk2 calls
* into user code. If this value is false then the value of
* the context class loader on the thread may be changed by
* the code hk2 is calling.
*
* When set to false this value is used to increase performance
* since getting and setting the context class loader can be expensive.
* However, if the user code being called by hk2 may change the context
* class loader of the thread, this value should be true to ensure that
* tricky and hard to find bugs don't arise when this thread is used for
* other purposes later on
*
* All new ServiceLocator implementation have this value initially set
* to true
*
* @param neutralContextClassLoader true if hk2 should ensure context class
* loader neutrality, false if hk2 should not change the context class loader
* on the thread around user code calls
*/
public void setNeutralContextClassLoader(boolean neutralContextClassLoader);
/**
* This method will analyze the given class, and create it if can. The object
* created in this way will not be managed by HK2. It is the responsibility of
* the caller to ensure that any lifecycle this object has is honored
*
* @param createMe The class to create, may not be null
* @return An instance of the object
*/
public T create(Class createMe);
/**
* This method will analyze the given class, and create it if can. The object
* created in this way will not be managed by HK2. It is the responsibility of
* the caller to ensure that any lifecycle this object has is honored
*
* @param createMe The class to create, may not be null
* @param strategy The name of the {@link ClassAnalyzer} that should be used. If
* null the default analyzer will be used
* @return An instance of the object
*/
public T create(Class createMe, String strategy);
/**
* This will analyze the given object and inject into its fields and methods.
* The object injected in this way will not be managed by HK2
*
* @param injectMe The object to be analyzed and injected into
*/
public void inject(Object injectMe);
/**
* This will analyze the given object and inject into its fields and methods.
* The object injected in this way will not be managed by HK2
*
* @param injectMe The object to be analyzed and injected into
* @param strategy The name of the {@link ClassAnalyzer} that should be used. If
* null the default analyzer will be used
*/
public void inject(Object injectMe, String strategy);
/**
* This will analyze the given object and call the postConstruct method.
* The object given will not be managed by HK2
*
* @param postConstructMe The object to postConstruct
*/
public void postConstruct(Object postConstructMe);
/**
* This will analyze the given object and call the postConstruct method.
* The object given will not be managed by HK2
*
* @param postConstructMe The object to postConstruct
* @param strategy The name of the {@link ClassAnalyzer} that should be used. If
* null the default analyzer will be used
*/
public void postConstruct(Object postConstructMe, String strategy);
/**
* This will analyze the given object and call the preDestroy method.
* The object given will not be managed by HK2
*
* @param preDestroyMe The object to preDestroy
*/
public void preDestroy(Object preDestroyMe);
/**
* This will analyze the given object and call the preDestroy method.
* The object given will not be managed by HK2
*
* @param preDestroyMe The object to preDestroy
* @param strategy The name of the {@link ClassAnalyzer} that should be used. If
* null the default analyzer will be used
*/
public void preDestroy(Object preDestroyMe, String strategy);
/**
* This method creates, injects and post-constructs an object with the given
* class. This is equivalent to calling the {@link ServiceLocator#create(Class)}
* method followed by the {@link ServiceLocator#inject(Object)} method followed
* by the {@link ServiceLocator#postConstruct(Object)} method.
*
* The object created is not managed by the locator.
*
* @param createMe The non-null class to create this object from
* @return An instance of the object that has been created, injected and post constructed
* @throws MultiException if there was an error when creating or initializing the object
*/
public U createAndInitialize(Class createMe);
/**
* This method creates, injects and post-constructs an object with the given
* class. This is equivalent to calling the {@link ServiceLocator#create(Class)}
* method followed by the {@link ServiceLocator#inject(Object)} method followed
* by the {@link ServiceLocator#postConstruct(Object)} method.
*
* The object created is not managed by the locator.
*
* @param createMe The non-null class to create this object from
* @param strategy The name of the {@link ClassAnalyzer} that should be used. If
* null the default analyzer will be used
* @return An instance of the object that has been created, injected and post constructed
* @throws MultiException if there was an error when creating or initializing the object
*/
public U createAndInitialize(Class createMe, String strategy);
}