org.hotswap.agent.config

Class PluginRegistry

java.lang.Object

org.hotswap.agent.config.PluginRegistry

public class PluginRegistry
extends Object

Registry to support plugin manager.

Author:

Jiri Bubnik

Field Summary

Fields

Modifier and Type	Field and Description
protected AnnotationProcessor	annotationProcessor
protected Map<Class,Map<ClassLoader,Object>>	registeredPlugins

Constructor Summary

Constructors

Constructor and Description
PluginRegistry(PluginManager pluginManager, ClassLoaderPatcher classLoaderPatcher) Create an instanec of plugin registry and initialize scanner and processor.

Method Summary

Modifier and Type	Method and Description
void	closeClassLoader(ClassLoader classLoader) Remove all registered plugins for a classloader.
ClassLoader	getAppClassLoader(Object plugin) Search for the plugin in the registry and return associated classloader.
<T> T	getPlugin(Class<T> pluginClass, ClassLoader classLoader) Returns plugin instance by it's type and classLoader.
protected Class<Object>	getPluginClass(String pluginClass)
Map<Class,Map<ClassLoader,Object>>	getRegisteredPlugins() Returns map of all registered plugins.
boolean	hasPlugin(Class<?> pluginClass, ClassLoader classLoader, boolean checkParent) Check if plugin is initialized in classLoader.
Object	initializePlugin(String pluginClass, ClassLoader appClassLoader) Init a plugin (create new plugin instance) in a application classloader.
protected Object	instantiate(Class<Object> plugin) Create a new instance of the plugin.
void	scanPlugins(ClassLoader classLoader, String pluginPackage) Scan for plugins by @Plugin annotation on PLUGIN_PATH and process plugin annotations.
void	setAnnotationProcessor(AnnotationProcessor annotationProcessor)
void	setAnnotationScanner(ClassPathAnnotationScanner annotationScanner)
void	setClassLoaderPatcher(ClassLoaderPatcher classLoaderPatcher)

Methods inherited from class java.lang.Object

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

Field Detail

registeredPlugins

protected Map<Class,Map<ClassLoader,Object>> registeredPlugins

annotationProcessor

protected AnnotationProcessor annotationProcessor

Constructor Detail

PluginRegistry

public PluginRegistry(PluginManager pluginManager,
                      ClassLoaderPatcher classLoaderPatcher)

Create an instanec of plugin registry and initialize scanner and processor.

Method Detail

getRegisteredPlugins

public Map<Class,Map<ClassLoader,Object>> getRegisteredPlugins()

Returns map of all registered plugins.

Returns:

map plugin class -> Map (ClassLoader -> Plugin instance)

setAnnotationScanner

public void setAnnotationScanner(ClassPathAnnotationScanner annotationScanner)

setAnnotationProcessor

public void setAnnotationProcessor(AnnotationProcessor annotationProcessor)

setClassLoaderPatcher

public void setClassLoaderPatcher(ClassLoaderPatcher classLoaderPatcher)

scanPlugins

public void scanPlugins(ClassLoader classLoader,
                        String pluginPackage)

Scan for plugins by @Plugin annotation on PLUGIN_PATH and process plugin annotations.

Parameters:

classLoader - classloader to resolve plugin package. This will be used by annotation scanner.

pluginPackage - the package to be searched (e.g. org.agent.hotswap.plugin)

initializePlugin

public Object initializePlugin(String pluginClass,
                               ClassLoader appClassLoader)

Init a plugin (create new plugin instance) in a application classloader. Each classloader may contain only one instance of a plugin.

Parameters:

pluginClass - class of plugin to instantiate

appClassLoader - target application classloader

Returns:

the new plugin instance or null if plugin is disabled.

getPlugin

public <T> T getPlugin(Class<T> pluginClass,
                       ClassLoader classLoader)

Returns plugin instance by it's type and classLoader.

Type Parameters:

T - type of the plugin to return correct instance.

Parameters:

pluginClass - type of the plugin

classLoader - classloader of the plugin

Returns:

the plugin

Throws:

IllegalArgumentException - if classLoader not initialized or plugin not found

hasPlugin

public boolean hasPlugin(Class<?> pluginClass,
                         ClassLoader classLoader,
                         boolean checkParent)

Check if plugin is initialized in classLoader.

Parameters:

pluginClass - type of the plugin

classLoader - classloader of the plugin

checkParent - for parent classloaders as well?

Returns:

true/false

getAppClassLoader

public ClassLoader getAppClassLoader(Object plugin)

Search for the plugin in the registry and return associated classloader.

Parameters:

plugin - existing plugin

Returns:

the classloader this plugin is associated with

getPluginClass

protected Class<Object> getPluginClass(String pluginClass)

instantiate

protected Object instantiate(Class<Object> plugin)

Create a new instance of the plugin.

Parameters:

plugin - plugin class

Returns:

new instance or null if instantiation fail.

closeClassLoader

public void closeClassLoader(ClassLoader classLoader)

Remove all registered plugins for a classloader.

Parameters:

classLoader - classloader to cleanup