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package com.sun.hk2.component;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.lang.annotation.Annotation;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collection;
import java.util.Collections;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.hk2.Binding;
import org.glassfish.hk2.Context;
import org.glassfish.hk2.Descriptor;
import org.glassfish.hk2.PreDestroy;
import org.glassfish.hk2.Provider;
import org.jvnet.hk2.component.DescriptorImpl;
import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.component.Inhabitant;
import org.jvnet.hk2.component.RunLevelException;
import org.jvnet.hk2.tracing.TracingThreadLocal;
import org.jvnet.hk2.tracing.TracingUtilities;
import sun.misc.BASE64Decoder;
/**
* Partial implementation of {@link Inhabitant} that defines methods whose
* semantics is fixed by {@link Habitat}.
*
* @author Kohsuke Kawaguchi
*/
public abstract class AbstractInhabitantImpl implements Inhabitant, Binding {
// private static final boolean MANAGED_ENABLED = Habitat.MANAGED_INJECTION_POINTS_ENABLED;
protected static final Logger logger = Logger.getLogger(AbstractInhabitantImpl.class.getName());
private Collection companions;
protected final Descriptor descriptor;
// private Collection> managed;
public AbstractInhabitantImpl(Descriptor descriptorOfSelf) {
// TODO: in the future, we should make the descriptor read-only
this.descriptor = (null == descriptorOfSelf) ? null : new DescriptorImpl(descriptorOfSelf, false);
}
protected static Descriptor getDescriptorFor(Inhabitant i) {
if (AbstractInhabitantImpl.class.isInstance(i)) {
return AbstractInhabitantImpl.class.cast(i).getDescriptor();
}
return null;
}
// TODO: handle Context
@Override
public Provider getProvider(Context ctx) {
return this;
}
@Override
public Provider getProvider() {
return getProvider(null);
}
public boolean matches(Descriptor matchTo) {
if (null == matchTo) {
return true;
}
return DescriptorImpl.matches(matchTo, descriptor);
}
@Override
public Descriptor getDescriptor() {
return descriptor;
}
@Override
public String toString() {
return getClass().getSimpleName() + "-" + System.identityHashCode(this) +
"(" + getDescriptor() + ")\n";
}
@Override
public final T get() {
try {
if (TracingUtilities.isEnabled()) {
TracingThreadLocal.get().push(this);
}
try {
return get(this);
} catch (RunLevelException e) {
// we are a holder, so we need to allow for {@link RunLevelService} constraints
// not properly being met --- in such cases return null
logger.log(Level.FINER, "swallowing error", e);
return null;
}
} finally {
if (TracingUtilities.isEnabled()) {
TracingThreadLocal.get().pop();
}
}
}
@Override
public U getByType(Class type) {
return (U) get();
}
@Override
public T getSerializedMetadata(final Class type, String key) {
String v = metadata().getOne(key);
if (v==null) {
return null;
}
try {
ObjectInputStream is = new ObjectInputStream(new ByteArrayInputStream(new BASE64Decoder().decodeBuffer(v))) {
final ClassLoader cl = System.getSecurityManager()!=null?
AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
return type.getClassLoader();
}
}):
type.getClassLoader();
/**
* Use ClassLoader of the given type. Otherwise by default we end up using the classloader
* that loaded HK2, which won't be able to see most of the user classes.
*/
protected Class resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
String name = desc.getName();
try {
return Class.forName(name,false,cl);
} catch (ClassNotFoundException ex) {
return super.resolveClass(desc);
}
}
};
return type.cast(is.readObject());
} catch (ClassNotFoundException e) {
throw new Error(e);
} catch (IOException e) {
throw new Error(e);
}
}
@Override
public final T getSerializedMetadata(Class type) {
return getSerializedMetadata(type,type.getName());
}
@Override
public Inhabitant lead() {
return null;
}
@Override
public final Collection companions() {
if (companions == null) {
return Collections.emptyList();
} else {
return companions;
}
}
@Override
public final void setCompanions(Collection companions) {
this.companions = companions;
}
// @Override
// public Inhabitant scopedClone() {
// return new ReferenceCountedLazyInhabitant(this);
// }
// public synchronized int getManagedCount() {
// if (null == managed) {
// return 0;
// }
//
// cleanManaged();
// return managed.size();
// }
//
// @Override
// public synchronized void manage(Inhabitant managedInhabitant) {
// if (!MANAGED_ENABLED) {
// return;
// }
//
// assert(null != managedInhabitant);
// assert(ReferenceCountedLazyInhabitant.class.isInstance(managedInhabitant));
// assert(this != managedInhabitant);
//
//// ReferenceCountedLazyInhabitant rcli = ReferenceCountedLazyInhabitant.class.cast(managedInhabitant);
//// if (rcli.getReal() == this) {
//// return;
//// }
//
// if (null == managed) {
// managed = new ArrayList>();
// } else {
// cleanManaged();
// }
//
// managed.add(managedInhabitant);
// }
//
// /**
// * Clean out old, gc-collected managed inhabitants
// */
// private void cleanManaged() {
// Iterator> iter = managed.iterator();
// while (iter.hasNext()) {
// if (!iter.next().isInstantiated()) {
// iter.remove();
// }
// }
// }
//
// @Override
// public void release() {
// if (null != managed) {
// releaseManaged();
// }
// }
//
protected final void dispose(T object) {
if (object instanceof PreDestroy) {
logger.log(Level.FINER, "calling PreDestroy on {0}", object);
((PreDestroy)object).preDestroy();
}
}
//
// protected synchronized void releaseManaged() {
// if (null != managed) {
// RuntimeException lastException = null;
//
// for (Inhabitant i : managed) {
// logger.log(Level.FINER, "releasing {0} on behalf of {1}", new Object[] {i, this});
// try {
// i.release();
// } catch (RuntimeException e) {
// logger.log(Level.FINE, "error encountered", e);
// lastException = e;
// }
// }
//
// managed = null;
//
// if (null != lastException) {
// throw lastException;
// }
// }
// }
public V getAnnotation(Class annotation) {
return getAnnotation(type(), annotation, false);
}
/**
* FOR INTERNAL USE TO HK2
*/
public static V getAnnotation(Class annotated,
Class annotation,
boolean walkParentChain) {
V v = annotated.getAnnotation(annotation);
if (null != v) {
return v;
}
for (Annotation a : annotated.getAnnotations()) {
v = a.annotationType().getAnnotation(annotation);
if (null != v) {
return v;
}
}
if (walkParentChain) {
annotated = annotated.getSuperclass();
if (null != annotated) {
return getAnnotation(annotated, annotation, true);
}
}
return null;
}
@Override
public Collection getAnnotations() {
// TODO:
throw new UnsupportedOperationException();
}
}
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