/** Creates a hudson.PluginStrategy, looking at the corresponding system property. */
protected PluginStrategy createPluginStrategy() {
String strategyName = System.getProperty(PluginStrategy.class.getName());
if (strategyName != null) {
try {
Class<?> klazz = getClass().getClassLoader().loadClass(strategyName);
Object strategy = klazz.getConstructor(PluginManager.class).newInstance(this);
if (strategy instanceof PluginStrategy) {
LOGGER.info("Plugin strategy: " + strategyName);
return (PluginStrategy) strategy;
} else {
LOGGER.warning(
"Plugin strategy (" + strategyName + ") is not an instance of hudson.PluginStrategy");
}
} catch (ClassNotFoundException e) {
LOGGER.warning("Plugin strategy class not found: " + strategyName);
} catch (Exception e) {
LOGGER.log(
WARNING,
"Could not instantiate plugin strategy: "
+ strategyName
+ ". Falling back to ClassicPluginStrategy",
e);
}
LOGGER.info("Falling back to ClassicPluginStrategy");
}
// default and fallback
return new ClassicPluginStrategy(this);
}
/**
* Get the plugin instances that extend a specific class, use to find similar plugins. Note:
* beware the classloader fun.
*
* @param pluginSuperclass The class that your plugin is derived from.
* @return The list of plugins implementing the specified class.
*/
public List<PluginWrapper> getPlugins(Class<? extends Plugin> pluginSuperclass) {
List<PluginWrapper> result = new ArrayList<PluginWrapper>();
for (PluginWrapper p : plugins) {
if (pluginSuperclass.isInstance(p.getPlugin())) result.add(p);
}
return Collections.unmodifiableList(result);
}
/**
* Return the {@link PluginWrapper} that loaded the given class 'c'.
*
* @since 1.402.
*/
public PluginWrapper whichPlugin(Class c) {
PluginWrapper oneAndOnly = null;
ClassLoader cl = c.getClassLoader();
for (PluginWrapper p : activePlugins) {
if (p.classLoader == cl) {
if (oneAndOnly != null) return null; // ambigious
oneAndOnly = p;
}
}
return oneAndOnly;
}
/**
* Get the plugin instance that implements a specific class, use to find your plugin singleton.
* Note: beware the classloader fun.
*
* @param pluginClazz The class that your plugin implements.
* @return The plugin singleton or <code>null</code> if for some reason the plugin is not loaded.
*/
public PluginWrapper getPlugin(Class<? extends Plugin> pluginClazz) {
for (PluginWrapper p : plugins) {
if (pluginClazz.isInstance(p.getPlugin())) return p;
}
return null;
}