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From rickh...@apache.org
Subject svn commit: r440833 - in /incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr: Activator.java GenericActivator.java
Date Wed, 06 Sep 2006 19:04:29 GMT
Author: rickhall
Date: Wed Sep  6 12:04:29 2006
New Revision: 440833

URL: http://svn.apache.org/viewvc?view=rev&rev=440833
Log:
Applied patch (FELIX-132) to have SCR listen for bundle events for
creating/disposing of components as well as to use reflection to get
the bundle context.

Modified:
    incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/Activator.java
    incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/GenericActivator.java

Modified: incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/Activator.java
URL: http://svn.apache.org/viewvc/incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/Activator.java?view=diff&rev=440833&r1=440832&r2=440833
==============================================================================
--- incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/Activator.java (original)
+++ incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/Activator.java Wed Sep  6
12:04:29 2006
@@ -16,25 +16,216 @@
  */
 package org.apache.felix.scr;
 
-import org.osgi.framework.BundleActivator;
-import org.osgi.framework.BundleContext;
+import java.lang.reflect.Method;
+import java.util.*;
+
+import org.osgi.framework.*;
 
 /**
- * This activator is used to cover requirement described in section 112.8.1
- * When SCR is implemented as a bundle, any component configurations
- * activated by SCR must be deactivated when the SCR bundle is stopped. When
- * the SCR bundle is started, it must process any components that are declared
- * in active bundles. 
- *
+ * This activator is used to cover requirement described in section 112.8.1 @@ -27,14
+ * 37,202 @@ in active bundles.
+ * 
  */
-public class Activator implements BundleActivator {
+public class Activator implements BundleActivator, SynchronousBundleListener
+{
+
+    // map of GenericActivator instances per Bundle indexed by Bundle symbolic
+    // name
+    private Map m_componentBundles;
+
+    /**
+     * Registers this instance as a (synchronous) bundle listener and loads the
+     * components of already registered bundles.
+     * 
+     * @param context The <code>BundleContext</code> of the SCR implementation
+     *      bundle.
+     */
+    public void start(BundleContext context) throws Exception
+    {
+        m_componentBundles = new HashMap();
+
+        // register for bundle updates
+        context.addBundleListener(this);
+
+        // 112.8.2 load all components of active bundles
+        loadAllComponents(context);
+    }
+
+    /**
+     * Unregisters this instance as a bundle listener and unloads all components
+     * which have been registered during the active life time of the SCR
+     * implementation bundle.
+     * 
+     * @param context The <code>BundleContext</code> of the SCR implementation
+     *      bundle.
+     */
+    public void stop(BundleContext context) throws Exception
+    {
+        // unregister as bundle listener
+        context.removeBundleListener(this);
+
+        // 112.8.2 dispose off all active components
+        disposeAllComponents();
+    }
+
+    // ---------- BundleListener Interface -------------------------------------
+
+    /**
+     * Loads and unloads any components provided by the bundle whose state
+     * changed. If the bundle has been started, the components are loaded. If
+     * the bundle is about to stop, the components are unloaded.
+     * 
+     * @param event The <code>BundleEvent</code> representing the bundle state
+     *      change.
+     */
+    public void bundleChanged(BundleEvent event)
+    {
+        if (event.getType() == BundleEvent.STARTED)
+        {
+            loadComponents(event.getBundle());
+        }
+        else if (event.getType() == BundleEvent.STOPPING)
+        {
+            disposeComponents(event.getBundle());
+        }
+    }
+
+    // ---------- Component Management -----------------------------------------
+
+    // Loads the components of all bundles currently active.
+    private void loadAllComponents(BundleContext context)
+    {
+        Bundle[] bundles = context.getBundles();
+        for (int i = 0; i < bundles.length; i++)
+        {
+            Bundle bundle = bundles[i];
+            if (bundle.getState() == Bundle.ACTIVE)
+            {
+                loadComponents(bundle);
+            }
+        }
+    }
+
+    /**
+     * Loads the components of the given bundle. If the bundle has no
+     * <i>Service-Component</i> header, this method has no effect. The
+     * fragments of a bundle are not checked for the header (112.4.1).
+     * <p>
+     * This method calls the {@link #getBundleContext(Bundle)} method to find
+     * the <code>BundleContext</code> of the bundle. If the context cannot be
+     * found, this method does not load components for the bundle.
+     */
+    private void loadComponents(Bundle bundle)
+    {
+        if (bundle.getHeaders().get("Service-Component") == null)
+        {
+            // no components in the bundle, abandon
+            return;
+        }
+
+        // there should be components, load them with a bundle context
+        BundleContext context = getBundleContext(bundle);
+        if (context == null)
+        {
+            GenericActivator.error("Cannot get BundleContext of bundle "
+                + bundle.getSymbolicName());
+            return;
+        }
+
+        GenericActivator ga = new GenericActivator();
+        try
+        {
+            ga.start(context);
+            m_componentBundles.put(bundle.getSymbolicName(), ga);
+        }
+        catch (Exception e)
+        {
+            GenericActivator.exception("Error while loading components "
+                + "of bundle " + bundle.getSymbolicName(), null, e);
+        }
+    }
+
+    /**
+     * Unloads components of the given bundle. If no components have been loaded
+     * for the bundle, this method has no effect.
+     */
+    private void disposeComponents(Bundle bundle)
+    {
+        String name = bundle.getSymbolicName();
+        GenericActivator ga = (GenericActivator) m_componentBundles.remove(name);
+        if (ga != null)
+        {
+            try
+            {
+                ga.dispose();
+            }
+            catch (Exception e)
+            {
+                GenericActivator.exception("Error while disposing components "
+                    + "of bundle " + name, null, e);
+            }
+        }
+    }
 
-	public void start(BundleContext arg0) throws Exception {
-		//TODO: pending
-	}
+    // Unloads all components registered with the SCR
+    private void disposeAllComponents()
+    {
+        for (Iterator it = m_componentBundles.values().iterator(); it.hasNext();)
+        {
+            GenericActivator ga = (GenericActivator) it.next();
+            try
+            {
+                ga.dispose();
+            }
+            catch (Exception e)
+            {
+                GenericActivator.exception(
+                    "Error while disposing components of bundle "
+                        + ga.getBundleContext().getBundle().getSymbolicName(),
+                    null, e);
+            }
+            it.remove();
+        }
+    }
 
-	public void stop(BundleContext arg0) throws Exception {
-		// TODO: pending
-	}
+    /**
+     * Returns the <code>BundleContext</code> of the bundle.
+     * <p>
+     * This method assumes a <code>getContext</code> method returning a
+     * <code>BundleContext</code> instance to be present in the class of the
+     * bundle or any of its parent classes.
+     * 
+     * @param bundle The <code>Bundle</code> whose context is to be returned.
+     * 
+     * @return The <code>BundleContext</code> of the bundle or
+     *         <code>null</code> if no <code>getContext</code> method
+     *         returning a <code>BundleContext</code> can be found.
+     */
+    private BundleContext getBundleContext(Bundle bundle)
+    {
+        for (Class clazz = bundle.getClass(); clazz != null; clazz = clazz.getSuperclass())
+        {
+            try
+            {
+                Method m = clazz.getDeclaredMethod("getContext", null);
+                if (m.getReturnType().equals(BundleContext.class))
+                {
+                    m.setAccessible(true);
+                    return (BundleContext) m.invoke(bundle, null);
+                }
+            }
+            catch (NoSuchMethodException nsme)
+            {
+                // don't actually care, just try super class
+            }
+            catch (Throwable t)
+            {
+                GenericActivator.exception("Cannot get BundleContext for "
+                    + bundle.getSymbolicName(), null, t);
+            }
+        }
 
-}
+        // fall back to nothing
+        return null;
+    }
+}
\ No newline at end of file

Modified: incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/GenericActivator.java
URL: http://svn.apache.org/viewvc/incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/GenericActivator.java?view=diff&rev=440833&r1=440832&r2=440833
==============================================================================
--- incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/GenericActivator.java (original)
+++ incubator/felix/trunk/scr/src/main/java/org/apache/felix/scr/GenericActivator.java Wed
Sep  6 12:04:29 2006
@@ -217,7 +217,13 @@
         //GenericActivator.trace("GenericActivator : Bundle ["+context.getBundle().getBundleId()+"]
STOPPED");
     }
 
-    /**
+    void dispose() throws Exception {
+        if (m_context != null) {
+            stop(m_context);
+        }
+    }
+
+   /**
     * Returns the list of instance references currently associated to this activator
     *
     * @return the list of instance references



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