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package org.apache.tuscany.osgi.util;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.osgi.framework.Bundle;
public class ClassloaderHook {
/**
* Return the BundleContext Classloader for the specified bundle.
*
* @param bundle The bundle whose BundleContext is desired.
* @return The BundleContext classloader for the specified bundle.
*/
ClassLoader getClassLoader(final Bundle bundle) {
if (System.getSecurityManager() == null) {
Object bundleLoader = invokeMethod(bundle, "checkLoader", null, null);
return (ClassLoader) invokeMethod(bundleLoader, "createClassLoader", null, null);
}
return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
Object bundleLoader = invokeMethod(bundle, "checkLoader", null, null);
return (ClassLoader) invokeMethod(bundleLoader, "createClassLoader", null, null);
}
});
}
/**
* Throws an IllegalStateException if the reflection logic cannot find what it is looking for. This probably means
* this class does not properly recognize the framework implementation.
*
* @param e Exception which indicates the reflection logic is confused.
*/
protected void reflectionException(Exception e) {
throw new IllegalStateException(
"ClassLoaderHook does not recognize the framework implementation: " + e.getMessage());
}
private Object invokeMethod(Object target, String methodName, Class[] parms, Object[] args) {
Method method;
try {
method = target.getClass().getMethod(methodName, parms);
if (method != null) {
return method.invoke(target, parms, args);
}
} catch (SecurityException e) {
reflectionException(e);
} catch (NoSuchMethodException e) {
reflectionException(e);
} catch (IllegalArgumentException e) {
reflectionException(e);
} catch (IllegalAccessException e) {
reflectionException(e);
} catch (InvocationTargetException e) {
reflectionException(e);
}
return null;
}
}
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