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/*******************************************************************************
* Copyright (c) 2006, 2010 Cognos Incorporated, 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
*
*******************************************************************************/
package org.eclipse.osgi.framework.internal.protocol;
import java.lang.reflect.Method;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.osgi.framework.adaptor.FrameworkAdaptor;
import org.eclipse.osgi.framework.log.FrameworkLogEntry;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.packageadmin.PackageAdmin;
import org.osgi.util.tracker.ServiceTracker;
/*
* An abstract class for handler factory impls (Stream and Content) that can
* handle environments running multiple osgi frameworks with the same VM.
*/
public abstract class MultiplexingFactory {
protected static final String PACKAGEADMINCLASS = "org.osgi.service.packageadmin.PackageAdmin"; //$NON-NLS-1$
protected BundleContext context;
protected FrameworkAdaptor adaptor;
private List<Object> factories; // list of multiplexed factories
private ServiceTracker<ServiceReference<?>, PackageAdmin> packageAdminTracker;
// used to get access to the protected SecurityManager#getClassContext method
static class InternalSecurityManager extends SecurityManager {
public Class<?>[] getClassContext() {
return super.getClassContext();
}
}
private static InternalSecurityManager internalSecurityManager = new InternalSecurityManager();
MultiplexingFactory(BundleContext context, FrameworkAdaptor adaptor) {
this.context = context;
this.adaptor = adaptor;
packageAdminTracker = new ServiceTracker<ServiceReference<?>, PackageAdmin>(context, PACKAGEADMINCLASS, null);
packageAdminTracker.open();
}
abstract public void setParentFactory(Object parentFactory);
abstract public Object getParentFactory();
public boolean isMultiplexing() {
return getFactories() != null;
}
public void register(Object factory) {
// set parent for each factory so they can do proper delegation
try {
Class<?> clazz = factory.getClass();
Method setParentFactory = clazz.getMethod("setParentFactory", new Class[] {Object.class}); //$NON-NLS-1$
setParentFactory.invoke(factory, new Object[] {getParentFactory()});
} catch (Exception e) {
adaptor.getFrameworkLog().log(new FrameworkLogEntry(MultiplexingFactory.class.getName(), FrameworkLogEntry.ERROR, 0, "register", FrameworkLogEntry.ERROR, e, null)); //$NON-NLS-1$
throw new RuntimeException(e.getMessage(), e);
}
addFactory(factory);
}
public void unregister(Object factory) {
removeFactory(factory);
// close the service tracker
try {
// this is brittle; if class does not directly extend MultplexingFactory then this method will not exist, but we do not want a public method here
Method closeTracker = factory.getClass().getSuperclass().getDeclaredMethod("closePackageAdminTracker", (Class[]) null); //$NON-NLS-1$
closeTracker.setAccessible(true); // its a private method
closeTracker.invoke(factory, (Object[]) null);
} catch (Exception e) {
adaptor.getFrameworkLog().log(new FrameworkLogEntry(MultiplexingFactory.class.getName(), FrameworkLogEntry.ERROR, 0, "unregister", FrameworkLogEntry.ERROR, e, null)); //$NON-NLS-1$
throw new RuntimeException(e.getMessage(), e);
}
}
public Object designateSuccessor() {
List<Object> released = releaseFactories();
// Note that we do this outside of the sync block above.
// This is only possible because we do additional locking outside of
// this class to ensure no other threads are trying to manipulate the
// list of registered factories. See Framework class the following methods:
// Framework.installURLStreamHandlerFactory(BundleContext, FrameworkAdaptor)
// Framework.installContentHandlerFactory(BundleContext, FrameworkAdaptor)
// Framework.uninstallURLStreamHandlerFactory
// Framework.uninstallContentHandlerFactory()
if (released == null || released.isEmpty())
return getParentFactory();
Object successor = released.remove(0);
try {
Class<?> clazz = successor.getClass();
Method register = clazz.getMethod("register", new Class[] {Object.class}); //$NON-NLS-1$
for (Object r : released) {
register.invoke(successor, new Object[] {r});
}
} catch (Exception e) {
adaptor.getFrameworkLog().log(new FrameworkLogEntry(MultiplexingFactory.class.getName(), FrameworkLogEntry.ERROR, 0, "designateSuccessor", FrameworkLogEntry.ERROR, e, null)); //$NON-NLS-1$
throw new RuntimeException(e.getMessage(), e);
}
closePackageAdminTracker(); // close tracker
return successor;
}
private void closePackageAdminTracker() {
packageAdminTracker.close();
}
public Object findAuthorizedFactory(List<Class<?>> ignoredClasses) {
List<Object> current = getFactories();
Class<?>[] classStack = internalSecurityManager.getClassContext();
for (int i = 0; i < classStack.length; i++) {
Class<?> clazz = classStack[i];
if (clazz == InternalSecurityManager.class || clazz == MultiplexingFactory.class || ignoredClasses.contains(clazz))
continue;
if (hasAuthority(clazz))
return this;
if (current == null)
continue;
for (Object factory : current) {
try {
Method hasAuthorityMethod = factory.getClass().getMethod("hasAuthority", new Class[] {Class.class}); //$NON-NLS-1$
if (((Boolean) hasAuthorityMethod.invoke(factory, new Object[] {clazz})).booleanValue()) {
return factory;
}
} catch (Exception e) {
adaptor.getFrameworkLog().log(new FrameworkLogEntry(MultiplexingFactory.class.getName(), FrameworkLogEntry.ERROR, 0, "findAuthorizedURLStreamHandler-loop", FrameworkLogEntry.ERROR, e, null)); //$NON-NLS-1$
throw new RuntimeException(e.getMessage(), e);
}
}
}
return null;
}
public boolean hasAuthority(Class<?> clazz) {
PackageAdmin packageAdminService = packageAdminTracker.getService();
if (packageAdminService != null) {
return packageAdminService.getBundle(clazz) != null;
}
return false;
}
private synchronized List<Object> getFactories() {
return factories;
}
private synchronized List<Object> releaseFactories() {
if (factories == null)
return null;
List<Object> released = new LinkedList<Object>(factories);
factories = null;
return released;
}
private synchronized void addFactory(Object factory) {
List<Object> updated = (factories == null) ? new LinkedList<Object>() : new LinkedList<Object>(factories);
updated.add(factory);
factories = updated;
}
private synchronized void removeFactory(Object factory) {
List<Object> updated = new LinkedList<Object>(factories);
updated.remove(factory);
factories = updated.isEmpty() ? null : updated;
}
}
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