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introducing Guice-based injector

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Kohsuke Kawaguchi committed 2010-12-10 10:23:39 -08:00
1 parent 001507695e
commit 53597a5d2d
3 files changed
+163 -122
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core/src/main/java/hudson/ExtensionFinder.java
+1 -122
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@@ -133,12 +133,11 @@ public abstract class ExtensionFinder implements ExtensionPoint {
}
/**
* The default implementation that looks for the {@link Extension} marker.
* The bootstrap implementation that looks for the {@link Extension} marker.
*
* <p>
* Uses Sezpoz as the underlying mechanism.
*/
@Extension
public static final class Sezpoz extends ExtensionFinder {
public <T> Collection<ExtensionComponent<T>> find(Class<T> type, Hudson hudson) {
List<ExtensionComponent<T>> result = new ArrayList<ExtensionComponent<T>>();
@@ -210,125 +209,5 @@ public abstract class ExtensionFinder implements ExtensionPoint {
}
}
@Extension
public static final class GuiceFinder extends ExtensionFinder {
private Injector container;
public GuiceFinder() {
Module m = new AbstractModule() {
@Override
protected void configure() {
ClassLoader cl = Hudson.getInstance().getPluginManager().uberClassLoader;
int id=0;
for (final IndexItem<Extension,Object> item : Index.load(Extension.class, Object.class, cl)) {
id++;
try {
AnnotatedElement e = item.element();
Class extType;
if (e instanceof Class) {
extType = (Class) e;
bind((Class<?>)e);
continue;
} else
if (e instanceof Field) {
extType = ((Field)e).getType();
bind(extType).annotatedWith(Names.named(String.valueOf(id)))
.toInstance(item.instance());
} else
if (e instanceof Method) {
extType = ((Method)e).getReturnType();
} else
throw new AssertionError();
if(type.isAssignableFrom(extType)) {
Object instance = item.instance();
if(instance!=null)
result.add(new ExtensionComponent<T>(type.cast(instance),item.annotation()));
}
} catch (LinkageError e) {
// sometimes the instantiation fails in an indirect classloading failure,
// which results in a LinkageError
LOGGER.log(item.annotation().optional() ? Level.FINE : Level.WARNING,
"Failed to load "+item.className(), e);
} catch (InstantiationException e) {
LOGGER.log(item.annotation().optional() ? Level.FINE : Level.WARNING,
"Failed to load "+item.className(), e);
}
}
}
};
container = Guice.createInjector(m);
}
public <T> Collection<ExtensionComponent<T>> find(Class<T> type, Hudson hudson) {
List<ExtensionComponent<T>> result = new ArrayList<ExtensionComponent<T>>();
ClassLoader cl = hudson.getPluginManager().uberClassLoader;
for (IndexItem<Extension,Object> item : Index.load(Extension.class, Object.class, cl)) {
try {
AnnotatedElement e = item.element();
Class<?> extType;
if (e instanceof Class) {
extType = (Class) e;
} else
if (e instanceof Field) {
extType = ((Field)e).getType();
} else
if (e instanceof Method) {
extType = ((Method)e).getReturnType();
} else
throw new AssertionError();
if(type.isAssignableFrom(extType)) {
Object instance = item.instance();
if(instance!=null)
result.add(new ExtensionComponent<T>(type.cast(instance),item.annotation()));
}
} catch (LinkageError e) {
// sometimes the instantiation fails in an indirect classloading failure,
// which results in a LinkageError
LOGGER.log(item.annotation().optional() ? Level.FINE : Level.WARNING,
"Failed to load "+item.className(), e);
} catch (InstantiationException e) {
LOGGER.log(item.annotation().optional() ? Level.FINE : Level.WARNING,
"Failed to load "+item.className(), e);
}
}
return result;
}
@Override
public void scout(Class extensionType, Hudson hudson) {
ClassLoader cl = hudson.getPluginManager().uberClassLoader;
for (IndexItem<Extension,Object> item : Index.load(Extension.class, Object.class, cl)) {
try {
AnnotatedElement e = item.element();
Class<?> extType;
if (e instanceof Class) {
extType = (Class) e;
} else
if (e instanceof Field) {
extType = ((Field)e).getType();
} else
if (e instanceof Method) {
extType = ((Method)e).getReturnType();
} else
throw new AssertionError();
// accroding to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6459208
// this appears to be the only way to force a class initialization
Class.forName(extType.getName(),true,extType.getClassLoader());
} catch (InstantiationException e) {
LOGGER.log(item.annotation().optional() ? Level.FINE : Level.WARNING,
"Failed to scout "+item.className(), e);
} catch (ClassNotFoundException e) {
LOGGER.log(Level.WARNING,"Failed to scout "+item.className(), e);
} catch (LinkageError e) {
LOGGER.log(Level.WARNING,"Failed to scout "+item.className(), e);
}
}
}
}
private static final Logger LOGGER = Logger.getLogger(ExtensionFinder.class.getName());
}