org.kuali.rice.kew.plugin
Class PluginEnvironment

java.lang.Object
  org.kuali.rice.kew.plugin.PluginEnvironment

All Implemented Interfaces:

Reloadable

public class PluginEnvironment
extends Object
implements Reloadable

A PluginEnvironment represents a Plugin and the PluginLoader from which it was loaded. Grouping these together allows us to execute a reload of the Plugin since the Plugin itself is not responsible for handling how it's own loading or reloading.

The PluginEnvironment also keeps a reference to the PluginRegistry because this allows it to add and remove Plugins as child resource loaders of the registry.

Author:

Kuali Rice Team (rice.collab@kuali.org)

Field Summary

private boolean	loaded
private PluginLoader	loader
private Plugin	plugin
private PluginRegistry	registry
private boolean	supressStartupFailure

Constructor Summary

PluginEnvironment(PluginLoader loader, PluginRegistry registry)
Constructs an unloaded PluginEnvironment from the given PluginLoader and PluginRegistry.

PluginEnvironment(Plugin plugin, PluginLoader loader, PluginRegistry registry)
Constructs a PluginEnvironment representing the given loaded Plugin.

Method Summary

PluginLoader	getLoader() Gets the PluginLoader which loaded the Plugin in this environment.
Plugin	getPlugin() Gets the Plugin represented by this environment.
String	getPluginName()
boolean	isLoaded() Returns true if this environment has been loaded, false otherwise.
boolean	isReloadable() Returns a boolean indicating whether or not this PluginEnvironment is truly reloadable.
boolean	isReloadNeeded() Indicates whether or not a reload of this environment is needed.
void	load() Loads the plugin from the PluginLoader.
void	reload() Reloads the environment by effectively executing an unload() followed by a load().
void	setSupressStartupFailure(boolean supressStartupFailure) By default, startup failure is supressed.
void	unload() Unloads the plugin.

Methods inherited from class java.lang.Object

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

Field Detail

loaded

private boolean loaded

plugin

private Plugin plugin

loader

private final PluginLoader loader

registry

private final PluginRegistry registry

supressStartupFailure

private boolean supressStartupFailure

Constructor Detail

PluginEnvironment

public PluginEnvironment(PluginLoader loader,
                         PluginRegistry registry)

Constructs an unloaded PluginEnvironment from the given PluginLoader and PluginRegistry. The environment will not be loaded until the first time that load() is executed.

PluginEnvironment

public PluginEnvironment(Plugin plugin,
                         PluginLoader loader,
                         PluginRegistry registry)

Constructs a PluginEnvironment representing the given loaded Plugin. Environments created in this manner will indicate that they are loaded from the moment they are constructed.

Method Detail

isLoaded

public boolean isLoaded()

Returns true if this environment has been loaded, false otherwise. If this method returns false then getPlugin() may return null if the environment was never loaded after construction.

isReloadable

public boolean isReloadable()

Returns a boolean indicating whether or not this PluginEnvironment is truly reloadable. This will return false if the Plugin represents a plugin which can not be reloaded.

Specified by:

isReloadable in interface Reloadable

Returns:

true if this Reloadable can be reloaded, false otherwise

isReloadNeeded

public boolean isReloadNeeded()

Indicates whether or not a reload of this environment is needed. If this method returns true, it should continue to return true until a reload() is executed.

Specified by:

isReloadNeeded in interface Reloadable

reload

public void reload()
            throws Exception

Reloads the environment by effectively executing an unload() followed by a load().

Specified by:

reload in interface Reloadable

Throws:

Exception

load

public void load()
          throws Exception

Loads the plugin from the PluginLoader. This will also start the Plugin and add it to the PluginRegistry's resoure loaders.

Throws:

Exception

unload

public void unload()
            throws Exception

Unloads the plugin. The effectively shuts the plugin down and removes it from the PluginRegistry's resource loaders.

Throws:

Exception

getPluginName

public String getPluginName()

getPlugin

public Plugin getPlugin()

Gets the Plugin represented by this environment. May be null if this environment has not yet been loaded.

getLoader

public PluginLoader getLoader()

Gets the PluginLoader which loaded the Plugin in this environment.

setSupressStartupFailure

public void setSupressStartupFailure(boolean supressStartupFailure)

By default, startup failure is supressed. If it is indicated that startup failure supression is not desired, then startup errors will be thrown directly from calls to load().