Package org.eclipse.aether.impl

Class DefaultServiceLocator

java.lang.Object

org.eclipse.aether.impl.DefaultServiceLocator

All Implemented Interfaces:

ServiceLocator

public final class DefaultServiceLocator
extends Object
implements ServiceLocator

A simple service locator that is already setup with all components from this library. To acquire a complete repository system, clients need to add an artifact descriptor reader, a version resolver, a version range resolver and optionally some repository connector and transporter factories to access remote repositories. Once the locator is fully populated, the repository system can be created like this:

 RepositorySystem repoSystem = serviceLocator.getService( RepositorySystem.class );
 

Note: This class is not thread-safe. Clients are expected to create the service locator and the repository system on a single thread.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private class	DefaultServiceLocator.Entry<T>
static class	DefaultServiceLocator.ErrorHandler	A hook to customize the handling of errors encountered while locating a service implementation.

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<Class<?>,DefaultServiceLocator.Entry<?>>	entries
private DefaultServiceLocator.ErrorHandler	errorHandler

Constructor Summary

Constructors

Constructor	Description
DefaultServiceLocator()	Creates a new service locator that already knows about all service implementations included this library.

Method Summary

Modifier and Type	Method	Description
<T> DefaultServiceLocator	addService(Class<T> type, Class<? extends T> impl)	Adds an implementation class for a service.
private <T> DefaultServiceLocator.Entry<T>	getEntry(Class<T> type, boolean create)
<T> T	getService(Class<T> type)	Gets an instance of the specified service.
<T> List<T>	getServices(Class<T> type)	Gets all available instances of the specified service.
private void	serviceCreationFailed(Class<?> type, Class<?> impl, Throwable exception)
void	setErrorHandler(DefaultServiceLocator.ErrorHandler errorHandler)	Sets the error handler to use.
<T> DefaultServiceLocator	setService(Class<T> type, Class<? extends T> impl)	Sets the implementation class for a service.
<T> DefaultServiceLocator	setServices(Class<T> type, T... services)	Sets the instances for a service.

Methods inherited from class java.lang.Object

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

Field Details

entries

private final Map<Class<?>,DefaultServiceLocator.Entry<?>> entries

errorHandler

private DefaultServiceLocator.ErrorHandler errorHandler

Constructor Details

DefaultServiceLocator

public DefaultServiceLocator()

Creates a new service locator that already knows about all service implementations included this library.

Method Details

getEntry

private <T> DefaultServiceLocator.Entry<T> getEntry(Class<T> type,
 boolean create)

setService

public <T> DefaultServiceLocator setService(Class<T> type,
 Class<? extends T> impl)

Sets the implementation class for a service. The specified class must have a no-arg constructor (of any visibility). If the service implementation itself requires other services for its operation, it should implement Service to gain access to this service locator.

Type Parameters:

T - The service type.

Parameters:

type - The interface describing the service, must not be null.

impl - The implementation class of the service, must not be null.

Returns:

This locator for chaining, never null.

addService

public <T> DefaultServiceLocator addService(Class<T> type,
 Class<? extends T> impl)

Adds an implementation class for a service. The specified class must have a no-arg constructor (of any visibility). If the service implementation itself requires other services for its operation, it should implement Service to gain access to this service locator.

Type Parameters:

T - The service type.

Parameters:

type - The interface describing the service, must not be null.

impl - The implementation class of the service, must not be null.

Returns:

This locator for chaining, never null.

setServices

public <T> DefaultServiceLocator setServices(Class<T> type,
 T... services)

Sets the instances for a service.

Type Parameters:

T - The service type.

Parameters:

type - The interface describing the service, must not be null.

services - The instances of the service, may be null but must not contain null elements.

Returns:

This locator for chaining, never null.

getService

public <T> T getService(Class<T> type)

Description copied from interface: ServiceLocator

Gets an instance of the specified service.

Specified by:

getService in interface ServiceLocator

Type Parameters:

T - The service type.

Parameters:

type - The interface describing the service, must not be null.

Returns:

The service instance or null if the service could not be located/initialized.

getServices

public <T> List<T> getServices(Class<T> type)

Description copied from interface: ServiceLocator

Gets all available instances of the specified service.

Specified by:

getServices in interface ServiceLocator

Type Parameters:

T - The service type.

Parameters:

type - The interface describing the service, must not be null.

Returns:

The (read-only) list of available service instances, never null.

serviceCreationFailed

private void serviceCreationFailed(Class<?> type,
 Class<?> impl,
 Throwable exception)

setErrorHandler

public void setErrorHandler(DefaultServiceLocator.ErrorHandler errorHandler)

Sets the error handler to use.

Parameters:

errorHandler - The error handler to use, may be null to ignore/swallow errors.