org.pentaho.platform.api.engine

Interface IPluginManager

public interface IPluginManager

The contract API between the platform and BIServer plugins. The plugin manager provides the ability to load and register plugins as well as utility methods for getting particular extension implementations from the set of registered plugins. It's object creation and management features are backed by a ListableBeanFactory For more information on platform plugins, visit the wiki link below.

Author:

jamesdixon, aphillips

See Also:

BI Platform Plugins

Method Summary

Methods

Modifier and Type	Method and Description
void	addPluginManagerListener(IPluginManagerListener listener) Add a IPluginManagerListener to be notified of IPluginManager events.
Object	getBean(String beanId) If any plugins have registered a bean by id beanId, this method will return a new instance of the object.
org.springframework.beans.factory.ListableBeanFactory	getBeanFactory(String pluginId) Returns a (Spring) bean factory for retrieving plugin-bound objects
ClassLoader	getClassLoader(String pluginId) Returns the classloader instance that was assigned by the plugin manager to load all classes for the specified plugin.
IContentGenerator	getContentGenerator(String type, String perspectiveName) Returns a IContentGenerator that can render the named perspective (e.g.
IContentGenerator	getContentGeneratorForType(String type, IPentahoSession session) Deprecated. Use {@link #getContentGenerator(String, String) instead
IContentInfo	getContentTypeInfo(String type) Gets metadata about a particular content type
Set<String>	getContentTypes() Returns a set of the content types that the registered plugins can process.
List<String>	getExternalResourcesForContext(String context) Return a List of scripts registered for a given context.
List<org.pentaho.ui.xul.XulOverlay>	getOverlays() Returns a list of the XUL overlays that are defined by all the plug-ins.
String	getPluginIdForClassLoader(ClassLoader classLoader) Each plugin is loaded on its own classloader, we can use this to find the plugin for which the classloader is serving
String	getPluginIdForType(String contentType) Returns the plugin (IPlatformPlugin) that handles requests for files of type contentType
List<String>	getPluginRESTPerspectivesForId(String id) Returns the Plugin perspectives for a plugin of specific id
List<String>	getPluginRESTPerspectivesForType(String contentType) Returns the Plugin perspectives for files of type contentType
Object	getPluginSetting(String pluginId, String key, String defaultValue) Retrieves a plugin setting for a given plugin and key.
List<String>	getRegisteredPlugins() Lists the ids of available plugins.
String	getServicePlugin(String path) Deprecated. This method may not work correctly for plugins in Sugar or later releases, in which a plugin does not provide the URL by which to access the resource. Use isPublic(String, String) if you want to determine if a particular plugin dir is accessable through the plugin resources REST service.
InputStream	getStaticResource(String path) Deprecated. This method may not work correctly for plugins in Sugar or later releases, in which a plugin does not provide the URL by which to access the resource. Use isPublic(String, String) if you want to determine if a particular plugin dir is accessable through the plugin resources REST service.
boolean	isBeanRegistered(String beanId) Returns true if a bean with id beanId has been registered with the plugin manager, i.e.
boolean	isPublic(String pluginId, String path) Returns true if the resource specified by path is publicly available, meaning this resource can be accessed by HTTP GET requests
boolean	isStaticResource(String path) Deprecated. This method may not work correctly for plugins in Sugar or later releases, in which a plugin does not provide the URL by which to access the resource. Use isPublic(String, String) if you want to determine if a particular plugin dir is accessable through the plugin resources REST service.
Class<?>	loadClass(String beanId) Returns a loaded class for the bean registered as beanId.
boolean	reload() Causes the plug-in manager object to re-register all of the plug-ins that it knows about.
boolean	reload(IPentahoSession session) Deprecated. Use reload() instead
void	unloadAllPlugins() Unloads all the plugins.

Method Detail

getContentTypes

Set<String> getContentTypes()

Returns a set of the content types that the registered plugins can process. If the plugin is intended to handle the processing of a document in the solution repository the types need to match with the filename extension.

Returns:

list of all the content types provided by plugins

getContentTypeInfo

IContentInfo getContentTypeInfo(String type)

Gets metadata about a particular content type

Parameters:

type - a content type provided by a plugin

Returns:

info object for a content type

getContentGeneratorForType

@Deprecated
IContentGenerator getContentGeneratorForType(String type,
                                                      IPentahoSession session)
                                             throws ObjectFactoryException

Deprecated. Use {@link #getContentGenerator(String, String) instead

Throws:

ObjectFactoryException

reload

boolean reload()

Causes the plug-in manager object to re-register all of the plug-ins that it knows about. A IPluginProvider may be invoked to discover plugins from various sources.

Returns:

true if no errors were encountered

reload

@Deprecated
boolean reload(IPentahoSession session)

Deprecated. Use reload() instead

getOverlays

List<org.pentaho.ui.xul.XulOverlay> getOverlays()

Returns a list of the XUL overlays that are defined by all the plug-ins. The overlays are XML fragments.

Returns:

List of XML XUL overlays

getBean

Object getBean(String beanId)
               throws PluginBeanException

If any plugins have registered a bean by id beanId, this method will return a new instance of the object. The correct classloader must be used to instantiate the object.

Parameters:

beanId - a unique identifier for a particular bean (cannot be null)

Returns:

an instance of the bean registered under beanId may generate an unchecked PluginBeanException if there was a problem retrieving the bean instance

Throws:

PluginBeanException

getContentGenerator

IContentGenerator getContentGenerator(String type,
                                    String perspectiveName)

Returns a IContentGenerator that can render the named perspective (e.g. 'viewer') of a resource of type type (e.g. 'prpt'). Essentially the same as (IContentGenerator)getBean (type+"/"+perspectiveName)

Parameters:

type - the type of resource to render

perspectiveName - specifies a distinct view of the resource. Can be null in which case the default perspective 'generatedContent' is implied.

Returns:

a list of suitable IContentGenerators may generate an unchecked NoSuchBeanDefinitionException - if there is no bean definition with the specified name may generate an unchecked BeansException - if the bean could not be obtained

loadClass

Class<?> loadClass(String beanId)
                   throws PluginBeanException

Returns a loaded class for the bean registered as beanId. The class will have been loaded by the proper classloader, so it indirectly provides the caller with it's classloader by class.getClassLoader(). This is often helpful since plugin bean classes are often not available through the caller's classloader.

Parameters:

beanId - a unique identifier for a particular bean (cannot be null)

Returns:

a loaded class for the registered bean

Throws:

PluginBeanException - if there was a problem loading the class

isBeanRegistered

boolean isBeanRegistered(String beanId)

Returns true if a bean with id beanId has been registered with the plugin manager, i.e. you can get a bean instance by calling getBean(String)

Parameters:

beanId - Cannot be null

Returns:

true if the bean is registered

unloadAllPlugins

void unloadAllPlugins()

Unloads all the plugins. Called when the context shuts down.

getPluginIdForType

String getPluginIdForType(String contentType)

Returns the plugin (IPlatformPlugin) that handles requests for files of type contentType

Parameters:

contentType - a user-defined file-extension like suffix denoting a type of content

Returns:

the id of the plugin that handles requests to files of type contentType or null if none were found

getPluginRESTPerspectivesForType

List<String> getPluginRESTPerspectivesForType(String contentType)

Returns the Plugin perspectives for files of type contentType

Parameters:

contentType - a user-defined file-extension like suffix denoting a type of content. for example xaction, prpt

Returns:

the list of REST perspectives for files of type contentType or null if none were found

getPluginRESTPerspectivesForId

List<String> getPluginRESTPerspectivesForId(String id)

Returns the Plugin perspectives for a plugin of specific id

Parameters:

the - id of the plugin

Returns:

the list of REST perspectives for a plugin of specific id or null if none were found

getPluginIdForClassLoader

String getPluginIdForClassLoader(ClassLoader classLoader)

Each plugin is loaded on its own classloader, we can use this to find the plugin for which the classloader is serving

Parameters:

classLoader - The classloader for the plugin, also used to load all plugin resources

Returns:

the plugin id which was loaded on the given classloader

getPluginSetting

Object getPluginSetting(String pluginId,
                      String key,
                      String defaultValue)

Retrieves a plugin setting for a given plugin and key.

Parameters:

pluginId - the ID of the plugin to find settings for

key - the setting name to lookup

defaultValue - the default to use if the setting key is not found

Returns:

the plugin setting

getServicePlugin

@Deprecated
String getServicePlugin(String path)

Deprecated. This method may not work correctly for plugins in Sugar or later releases, in which a plugin does not provide the URL by which to access the resource. Use isPublic(String, String) if you want to determine if a particular plugin dir is accessable through the plugin resources REST service.

Returns the plugin that can handle a request for the resource at "path". A plugin is determined to be able to serve the request if it either a content generator or a static resource of the plugin is configured to handle the path. In other words, if a plugin has a static resource of "/my-plugin/resources", then a request to "/my-plugin/resources/images/file.png" can be handled by the plugin. If ultimately, no plugin can handle the resource path, null is returned.

Parameters:

path - the path to the plugin resource

Returns:

the ID of the plugin which owns the resource or null if one cannot be found

getClassLoader

ClassLoader getClassLoader(String pluginId)

Returns the classloader instance that was assigned by the plugin manager to load all classes for the specified plugin. Used in combination with getServicePlugin(String), this method can provide you with a way to load resources from a plugin when all you have is a request URL/path, such as in a servlet environment.

Parameters:

pluginId - the plugin for which we want to get the assigned classloader

Returns:

the classloader assigned to this plugin, or null if the plugin is not known by the plugin manager, or for some reason a classloader was not assigned to the plugin (an error condition).

getBeanFactory

org.springframework.beans.factory.ListableBeanFactory getBeanFactory(String pluginId)

Returns a (Spring) bean factory for retrieving plugin-bound objects

Parameters:

pluginId -

Returns:

a bean factory for retrieving instances of plugin-provided objects

isStaticResource

@Deprecated
boolean isStaticResource(String path)

Deprecated. This method may not work correctly for plugins in Sugar or later releases, in which a plugin does not provide the URL by which to access the resource. Use isPublic(String, String) if you want to determine if a particular plugin dir is accessable through the plugin resources REST service.

returns true if the path is a reference to a potential static resource. Note that this does not guarantee that the resource exists, just that it maps to a static resource location.

Parameters:

path - static resource path

Returns:

true if path begins as a static resource

isPublic

boolean isPublic(String pluginId,
               String path)

Returns true if the resource specified by path is publicly available, meaning this resource can be accessed by HTTP GET requests

Parameters:

pluginId - the id of the plugin to search for the dir

path - a path relative to the plugin folder to check for public availability

Returns:

true if publicly available or false if not available for any reason

getStaticResource

@Deprecated
InputStream getStaticResource(String path)

Deprecated. This method may not work correctly for plugins in Sugar or later releases, in which a plugin does not provide the URL by which to access the resource. Use isPublic(String, String) if you want to determine if a particular plugin dir is accessable through the plugin resources REST service.

Returns and InputStream to the specified resource path.

Parameters:

path - the path to the plugin resource

Returns:

the InputStream which may be used to read the plugin resource

getRegisteredPlugins

List<String> getRegisteredPlugins()

Lists the ids of available plugins. From the id, you can get lots of information about a plugin, such as the bean factory which gives you access to information on all specified beans for that plugin.

Returns:

list of plugin ids

getExternalResourcesForContext

List<String> getExternalResourcesForContext(String context)

Return a List of scripts registered for a given context.

Parameters:

context - named area in the platform

Returns:

list of registered scripts

addPluginManagerListener

void addPluginManagerListener(IPluginManagerListener listener)

Add a IPluginManagerListener to be notified of IPluginManager events.

Parameters:

listener -