org.jivesoftware.openfire.container

Class PluginManager

java.lang.Object

org.jivesoftware.openfire.container.PluginManager

public class PluginManager
extends Object

Loads and manages plugins. The plugins directory is monitored for any new plugins, and they are dynamically loaded.

An instance of this class can be obtained using:

XMPPServer.getInstance().getPluginManager()

Author:

Matt Tucker

See Also:

Plugin, XMPPServer.getPluginManager()

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PluginManager.License An enumberation for plugin license agreement types.

Constructor Summary

Constructors

Constructor and Description
PluginManager(File pluginDir) Constructs a new plugin manager.

Method Summary

Methods

Modifier and Type	Method and Description
void	addPluginListener(PluginListener listener)
void	addPluginManagerListener(PluginManagerListener listener)
String	getAuthor(Plugin plugin) Returns the author of a plugin.
String	getDatabaseKey(Plugin plugin) Returns the database schema key of a plugin, if it exists.
int	getDatabaseVersion(Plugin plugin) Returns the database schema version of a plugin, if it exists.
String	getDescription(Plugin plugin) Returns the description of a plugin.
PluginDevEnvironment	getDevEnvironment(Plugin plugin) Returns a plugin's dev environment if development mode is enabled for the plugin.
PluginManager.License	getLicense(Plugin plugin) Returns the license agreement type that the plugin is governed by.
String	getMinServerVersion(Plugin plugin) Returns the minimum server version this plugin can run within.
String	getName(Plugin plugin) Returns the name of a plugin.
Plugin	getPlugin(String name) Returns a plugin by name or null if a plugin with that name does not exist.
PluginClassLoader	getPluginClassloader(Plugin plugin) Returns the classloader of a plugin.
File	getPluginDirectory(Plugin plugin) Returns the plugin's directory.
File	getPluginFile(String name) Returns the JAR or WAR file that created the plugin.
Collection<Plugin>	getPlugins() Returns a Collection of all installed plugins.
String	getVersion(Plugin plugin) Returns the version of a plugin.
boolean	installPlugin(InputStream in, String pluginFilename) Installs or updates an existing plugin.
boolean	isExecuted() Returns true if at least one attempt to load plugins has been done.
boolean	isPluginDownloaded(String pluginFilename) Returns true if the specified filename, that belongs to a plugin, exists.
Class	loadClass(Plugin plugin, String className) Loads a class from the classloader of a plugin.
void	removePluginListener(PluginListener listener)
void	removePluginManagerListener(PluginManagerListener listener)
void	shutdown() Shuts down all running plugins.
void	start() Starts plugins and the plugin monitoring service.
void	unloadPlugin(String pluginName) Unloads a plugin.

Methods inherited from class java.lang.Object

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

Constructor Detail

PluginManager

public PluginManager(File pluginDir)

Constructs a new plugin manager.

Parameters:

pluginDir - the plugin directory.

Method Detail

start

public void start()

Starts plugins and the plugin monitoring service.

shutdown

public void shutdown()

Shuts down all running plugins.

installPlugin

public boolean installPlugin(InputStream in,
                    String pluginFilename)

Installs or updates an existing plugin.

Parameters:

in - the input stream that contains the new plugin definition.

pluginFilename - the filename of the plugin to create or update.

Returns:

true if the plugin was successfully installed or updated.

isPluginDownloaded

public boolean isPluginDownloaded(String pluginFilename)

Returns true if the specified filename, that belongs to a plugin, exists.

Parameters:

pluginFilename - the filename of the plugin to create or update.

Returns:

true if the specified filename, that belongs to a plugin, exists.

getPlugins

public Collection<Plugin> getPlugins()

Returns a Collection of all installed plugins.

Returns:

a Collection of all installed plugins.

getPlugin

public Plugin getPlugin(String name)

Returns a plugin by name or null if a plugin with that name does not exist. The name is the name of the directory that the plugin is in such as "broadcast".

Parameters:

name - the name of the plugin.

Returns:

the plugin.

getPluginDirectory

public File getPluginDirectory(Plugin plugin)

Returns the plugin's directory.

Parameters:

plugin - the plugin.

Returns:

the plugin's directory.

getPluginFile

public File getPluginFile(String name)

Returns the JAR or WAR file that created the plugin.

Parameters:

name - the name of the plugin.

Returns:

the plugin JAR or WAR file.

isExecuted

public boolean isExecuted()

Returns true if at least one attempt to load plugins has been done. A true value does not mean that available plugins have been loaded nor that plugins to be added in the future are already loaded. :)

TODO Current version does not consider child plugins that may be loaded in a second attempt. It either TODO consider plugins that were found but failed to be loaded due to some error.

Returns:

true if at least one attempt to load plugins has been done.

unloadPlugin

public void unloadPlugin(String pluginName)

Unloads a plugin. The Plugin.destroyPlugin() method will be called and then any resources will be released. The name should be the name of the plugin directory and not the name as given by the plugin meta-data. This method only removes the plugin but does not delete the plugin JAR file. Therefore, if the plugin JAR still exists after this method is called, the plugin will be started again the next time the plugin monitor process runs. This is useful for "restarting" plugins.

This method is called automatically when a plugin's JAR file is deleted.

Parameters:

pluginName - the name of the plugin to unload.

loadClass

public Class loadClass(Plugin plugin,
              String className)
                throws ClassNotFoundException,
                       IllegalAccessException,
                       InstantiationException

Loads a class from the classloader of a plugin.

Parameters:

plugin - the plugin.

className - the name of the class to load.

Returns:

the class.

Throws:

ClassNotFoundException - if the class was not found.

IllegalAccessException - if not allowed to access the class.

InstantiationException - if the class could not be created.

getDevEnvironment

public PluginDevEnvironment getDevEnvironment(Plugin plugin)

Returns a plugin's dev environment if development mode is enabled for the plugin.

Parameters:

plugin - the plugin.

Returns:

the plugin dev environment, or null if development mode is not enabled for the plugin.

getName

public String getName(Plugin plugin)

Returns the name of a plugin. The value is retrieved from the plugin.xml file of the plugin. If the value could not be found, null will be returned. Note that this value is distinct from the name of the plugin directory.

Parameters:

plugin - the plugin.

Returns:

the plugin's name.

getDescription

public String getDescription(Plugin plugin)

Returns the description of a plugin. The value is retrieved from the plugin.xml file of the plugin. If the value could not be found, null will be returned.

Parameters:

plugin - the plugin.

Returns:

the plugin's description.

getAuthor

public String getAuthor(Plugin plugin)

Returns the author of a plugin. The value is retrieved from the plugin.xml file of the plugin. If the value could not be found, null will be returned.

Parameters:

plugin - the plugin.

Returns:

the plugin's author.

getVersion

public String getVersion(Plugin plugin)

Returns the version of a plugin. The value is retrieved from the plugin.xml file of the plugin. If the value could not be found, null will be returned.

Parameters:

plugin - the plugin.

Returns:

the plugin's version.

getMinServerVersion

public String getMinServerVersion(Plugin plugin)

Returns the minimum server version this plugin can run within. The value is retrieved from the plugin.xml file of the plugin. If the value could not be found, null will be returned.

Parameters:

plugin - the plugin.

Returns:

the plugin's version.

getDatabaseKey

public String getDatabaseKey(Plugin plugin)

Returns the database schema key of a plugin, if it exists. The value is retrieved from the plugin.xml file of the plugin. If the value could not be found, null will be returned.

Parameters:

plugin - the plugin.

Returns:

the plugin's database schema key or null if it doesn't exist.

getDatabaseVersion

public int getDatabaseVersion(Plugin plugin)

Returns the database schema version of a plugin, if it exists. The value is retrieved from the plugin.xml file of the plugin. If the value could not be found, -1 will be returned.

Parameters:

plugin - the plugin.

Returns:

the plugin's database schema version or -1 if it doesn't exist.

getLicense

public PluginManager.License getLicense(Plugin plugin)

Returns the license agreement type that the plugin is governed by. The value is retrieved from the plugin.xml file of the plugin. If the value could not be found, PluginManager.License.other is returned.

Parameters:

plugin - the plugin.

Returns:

the plugin's license agreement.

getPluginClassloader

public PluginClassLoader getPluginClassloader(Plugin plugin)

Returns the classloader of a plugin.

Parameters:

plugin - the plugin.

Returns:

the classloader of the plugin.

addPluginListener

public void addPluginListener(PluginListener listener)

removePluginListener

public void removePluginListener(PluginListener listener)

addPluginManagerListener

public void addPluginManagerListener(PluginManagerListener listener)

removePluginManagerListener

public void removePluginManagerListener(PluginManagerListener listener)