Module (HK2 core module 2.5.0-b53 API)

All Known Implementing Classes:

ModuleImpl, ProxyModule
```
public interface Module
```
Author:

Sanjeeb.Sahoo@Sun.COM

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addImport(Module module)`
`Module`	`addImport(ModuleDependency dependency)` Create and add a new module to this module's list of imports.
`void`	`addListener(ModuleChangeListener listener)` Add a new module change listener
`void`	`detach()` Detach this module from its registry.
`void`	`dumpState(PrintStream writer)`
`ClassLoader`	`getClassLoader()` Return the `ClassLoader` instance associated with this module.
`List<Module>`	`getImports()` Returns the list of imported modules.
`ModuleMetadata`	`getMetadata()` Gets the metadata of this module.
`ModuleDefinition`	`getModuleDefinition()` Returns the module definition for this module instance
`String`	`getName()` Short-cut for `getModuleDefinition().getName()`.
`<T> Iterable<Class<? extends T>>`	`getProvidersClass(Class<T> serviceClass)`
`Iterable<Class>`	`getProvidersClass(String name)`
`ModulesRegistry`	`getRegistry()` Returns the registry owning this module
`ModuleState`	`getState()` Returns the module's state
`boolean`	`hasProvider(Class serviceClass)` Returns true if this module has any provider for the given service class.
`boolean`	`isShared()` Returns true if this module is sharable.
`boolean`	`isSticky()` Returns true if the module is sticky.
`void`	`refresh()` Trigger manual refresh mechanism, the module will check all its URLs and generate change events if any of them has changed.
`void`	`removeListener(ModuleChangeListener listener)` Unregister a module change listener
`void`	`resolve()` Ensure that this module is `resolved`.
`void`	`setSticky(boolean sticky)` Sets the sticky flag.
`void`	`start()` Forces module startup.
`boolean`	`stop()` Forces module stop.
`void`	`uninstall()` Removes the module from the registry backing store, the module will need be reinstalled to be loaded.

- Method Detail
  - getModuleDefinition
```
ModuleDefinition getModuleDefinition()
```
    Returns the module definition for this module instance
    
    Returns:
    the module definition
  - getName
```
String getName()
```
    Short-cut for getModuleDefinition().getName().
  - getRegistry
```
ModulesRegistry getRegistry()
```
    Returns the registry owning this module
    
    Returns:
    the registry owning the module
  - getState
```
ModuleState getState()
```
    Returns the module's state
    
    Returns:
    the module's state
  - resolve
```
void resolve()
             throws ResolveError
```
    Ensure that this module is resolved.
    If the module is already resolved, this method does nothing. Otherwise, iterate over all declared ModuleDependency instances and use the associated ModuleRegistry to resolve it. After successful completion of this method, the module state is ModuleState.RESOLVED.
    
    Throws:
    
    ResolveError - if any of the declared dependency of this module cannot be satisfied
  - start
```
void start()
           throws ResolveError
```
    Forces module startup. In most cases, the runtime will take care of starting modules when they are first used. There could be cases where code need to manually start a sub module. Invoking this method will move the module to the ModuleState.READY, the Lifecycle.start method will be invoked.
    
    Throws:
    
    ResolveError
  - stop
```
boolean stop()
```
    Forces module stop. In most cases, the runtime will take care of stopping modules when the last module user released its interest. However, in certain cases, it may be interesting to manually stop the module. Stopping the module means that the module is removed from the registry, the class loader references are released (note : the class loaders will only be released if all instances of any class loaded by them are gc'ed). If a LifecyclePolicy for this module is defined, the Lifecycle.stop(Module) method will be called and finally the module state will be returned to ModuleState.NEW.
    
    Returns:
    true if unloading was successful
  - detach
```
void detach()
```
    Detach this module from its registry. This does not free any of the loaded resources. Only proper release of all references to the public class loader will ensure module being garbage collected. Detached modules are orphan and will be garbage collected if resources are properly disposed.
  - refresh
```
void refresh()
```
    Trigger manual refresh mechanism, the module will check all its URLs and generate change events if any of them has changed. This will allow the owning registry to force a module upgrade at next module request.
  - getMetadata
```
ModuleMetadata getMetadata()
```
    Gets the metadata of this module.
  - addListener
```
void addListener(ModuleChangeListener listener)
```
    Add a new module change listener
    
    Parameters:
    listener - the listener
  - removeListener
```
void removeListener(ModuleChangeListener listener)
```
    Unregister a module change listener
    
    Parameters:
    listener - the listener to unregister
  - getClassLoader
```
ClassLoader getClassLoader()
```
    Return the ClassLoader instance associated with this module. Only designated public interfaces will be loaded and returned by this classloader
    
    Returns:
    the public ClassLoader
  - getImports
```
List<Module> getImports()
```
    Returns the list of imported modules.
    This is the module version of ModuleDefinition.getDependencies(), but after fully resolved.
    To enforce the stable class visibility, once Module is created, dependencies cannot be changed — that is, we don't want "a.b.C" to suddenly mean something different once the code starts running.
    
    Returns:
    Can be empty but never null. Read-only.
  - addImport
```
void addImport(Module module)
```
  - addImport
```
Module addImport(ModuleDependency dependency)
```
    Create and add a new module to this module's list of imports.
    
    Parameters:
    dependency - new module's definition
  - isShared
```
boolean isShared()
```
    Returns true if this module is sharable. A sharable module means that onlu one instance of the module classloader will be used by all users.
    
    Returns:
    true if this module is sharable.
  - isSticky
```
boolean isSticky()
```
    Returns true if the module is sticky. A sticky module cannot be stopped or unloaded. Once a sticky module is loaded or started, it will stay in the JVM until it exists.
    
    Returns:
    true is the module is sticky
  - setSticky
```
void setSticky(boolean sticky)
```
    Sets the sticky flag.
    
    Parameters:
    sticky - true if the module should stick around
  - getProvidersClass
```
<T> Iterable<Class<? extends T>> getProvidersClass(Class<T> serviceClass)
```
  - getProvidersClass
```
Iterable<Class> getProvidersClass(String name)
```
  - hasProvider
```
boolean hasProvider(Class serviceClass)
```
    Returns true if this module has any provider for the given service class.
  - dumpState
```
void dumpState(PrintStream writer)
```
  - uninstall
```
void uninstall()
```
    Removes the module from the registry backing store, the module will need be reinstalled to be loaded.

Interface Module

Method Summary

Method Detail

getModuleDefinition

getName

getRegistry

getState

resolve

start

stop

detach

refresh

getMetadata

addListener

removeListener

getClassLoader

getImports

addImport

addImport

isShared

isSticky

setSticky

getProvidersClass

getProvidersClass

hasProvider

dumpState

uninstall