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/*******************************************************************************
* Copyright (c) 2010, 2017 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.weaving;
import java.util.*;
import org.eclipse.osgi.internal.framework.EquinoxContainer;
import org.eclipse.osgi.internal.hookregistry.ClassLoaderHook;
import org.eclipse.osgi.internal.loader.BundleLoader;
import org.eclipse.osgi.internal.loader.ModuleClassLoader;
import org.eclipse.osgi.internal.loader.classpath.ClasspathEntry;
import org.eclipse.osgi.internal.loader.classpath.ClasspathManager;
import org.eclipse.osgi.internal.serviceregistry.ServiceRegistry;
import org.eclipse.osgi.storage.bundlefile.BundleEntry;
import org.osgi.framework.*;
public class WeavingHookConfigurator extends ClassLoaderHook {
static class WovenClassContext {
List<WovenClassImpl> wovenClassStack = new ArrayList<>(6);
List<String> processClassNameStack = new ArrayList<>(6);
}
// holds the map of black listed hooks. Use weak map to avoid pinning and simplify cleanup.
private final Map<ServiceRegistration<?>, Boolean> blackList = Collections.synchronizedMap(new WeakHashMap<ServiceRegistration<?>, Boolean>());
// holds the stack of WovenClass objects currently being used to define classes
private final ThreadLocal<WovenClassContext> wovenClassContext = new ThreadLocal<>();
private final EquinoxContainer container;
public WeavingHookConfigurator(EquinoxContainer container) {
this.container = container;
}
private ServiceRegistry getRegistry() {
return container.getServiceRegistry();
}
public byte[] processClass(String name, byte[] classbytes, ClasspathEntry classpathEntry, BundleEntry entry, ClasspathManager manager) {
ServiceRegistry registry = getRegistry();
if (registry == null)
return null; // no registry somehow we are loading classes before the registry has been created
ModuleClassLoader classLoader = manager.getClassLoader();
BundleLoader loader = classLoader.getBundleLoader();
// create a woven class object and add it to the thread local stack
WovenClassImpl wovenClass = new WovenClassImpl(name, classbytes, entry, classpathEntry, loader, container, blackList);
WovenClassContext context = wovenClassContext.get();
if (context == null) {
context = new WovenClassContext();
wovenClassContext.set(context);
}
context.wovenClassStack.add(wovenClass);
// If we detect recursion for the same class name then we will not call the
// weaving hooks for the second request to load.
// Note that this means the actual bytes that get used to define the class
// will not have been woven at all.
if (!context.processClassNameStack.contains(name)) {
context.processClassNameStack.add(name);
// call the weaving hooks
try {
return wovenClass.callHooks();
} catch (Throwable t) {
ServiceRegistration<?> errorHook = wovenClass.getErrorHook();
Bundle errorBundle = errorHook != null ? errorHook.getReference().getBundle() : manager.getGeneration().getRevision().getBundle();
container.getEventPublisher().publishFrameworkEvent(FrameworkEvent.ERROR, errorBundle, t);
// fail hard with a class loading error
ClassFormatError error = new ClassFormatError("Unexpected error from weaving hook."); //$NON-NLS-1$
error.initCause(t);
throw error;
} finally {
context.processClassNameStack.remove(name);
}
}
return null;
}
public void recordClassDefine(String name, Class<?> clazz, byte[] classbytes, ClasspathEntry classpathEntry, BundleEntry entry, ClasspathManager manager) {
// here we assume the stack contans a woven class with the same name as the class we are defining.
WovenClassContext context = wovenClassContext.get();
if (context == null || context.wovenClassStack.size() == 0)
return;
WovenClassImpl wovenClass = context.wovenClassStack.remove(context.wovenClassStack.size() - 1);
// inform the woven class about the class that was defined.
wovenClass.setWeavingCompleted(clazz);
}
@Override
public boolean isProcessClassRecursionSupported() {
return true;
}
}
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