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/*******************************************************************************
* Copyright (c) 2013 Markus Alexander Kuppe 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:
* Markus Alexander Kuppe - initial API and implementation
******************************************************************************/
package org.eclipse.e4.core.di.internal.extensions;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.e4.core.di.InjectionException;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.core.di.suppliers.ExtendedObjectSupplier;
import org.eclipse.e4.core.di.suppliers.IObjectDescriptor;
import org.eclipse.e4.core.di.suppliers.IRequestor;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.BundleListener;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.SynchronousBundleListener;
public class OSGiObjectSupplier extends ExtendedObjectSupplier {
/**
* A Map of Requestor to BundleListener. Each Requestor will only ever request its own bundle and thus there is a 1:1 relationship between R and BL.
*/
private final Map<IRequestor, BundleListener> requestor2listener = new HashMap<IRequestor, BundleListener>();
private final BundleContext localBundleContext = FrameworkUtil.getBundle(OSGiObjectSupplier.class).getBundleContext();
@Override
public Object get(IObjectDescriptor descriptor, IRequestor requestor, boolean track, boolean group) {
final Class<?> requestingObjectClass = requestor.getRequestingObjectClass();
final Type desiredType = descriptor.getDesiredType();
if (BundleContext.class.equals(desiredType)) {
final Bundle bundle = FrameworkUtil.getBundle(requestingObjectClass);
// Cannot use BundleListener as a BL can only be registered with a BC (which might be null)
if (track) {
if (!requestor2listener.containsKey(requestor)) {
track(bundle, requestor);
}
} else {
untrack(requestor);
}
final BundleContext bundleContext = bundle.getBundleContext();
if (bundleContext != null) {
return bundleContext;
} else if (descriptor.getQualifier(Optional.class) != null) {
// Do not have a bundle context but requestor has marked the parameter/field optional
return null;
}
throw new InjectionException("Unable to inject BundleContext: " + bundle.getSymbolicName() + " bundle is not active or starting/stopping"); //$NON-NLS-1$ //$NON-NLS-2$
} else if (Bundle.class.equals(desiredType)) {
// Not tracking the Bundle's life-cycle because the B instance does
// not change whether a bundle is ACTIVE or RESOLVED. The only
// thing worth tracking is when a bundle switches to the INSTALLED
// state. However, the requestor will go away along with its bundle anyway.
return FrameworkUtil.getBundle(requestingObjectClass);
}
// Annotation used with unsupported type
return null;
}
private void untrack(final IRequestor requestor) {
synchronized (requestor2listener) {
BundleListener l = requestor2listener.remove(requestor);
localBundleContext.removeBundleListener(l);
}
}
private void track(final Bundle bundle, final IRequestor requestor) {
// A _synchronous_ BundleListener asserts that the BC is un-injected,
// _before_ it becomes invalid (state-wise).
BundleListener listener = new SynchronousBundleListener() {
public void bundleChanged(BundleEvent event) {
if (event.getBundle().equals(bundle)) {
if (requestor.isValid()) {
requestor.resolveArguments(false);
requestor.execute();
}
}
}
};
synchronized (requestor2listener) {
localBundleContext.addBundleListener(listener);
requestor2listener.put(requestor, listener);
}
}
}
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