added a BundleTracker as instrumentation for catching unexpected STOP events in bundles at runtime

java/com.sap.sailing.server/src/com/sap/sailing/server/admin/ExtenderBundleTracker.java

@@ -0,0 +1,98 @@
+package com.sap.sailing.server.admin;
+
+import java.util.logging.Logger;
+
+import org.osgi.framework.Bundle;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.BundleEvent;
+import org.osgi.util.tracker.BundleTracker;
+
+/**
+ * Bundle tracker for tracking of the lifecycle of important runtime bundles
+ * based on the extender pattern. 
+ * In order to track a bundle just add 'TrackLifecycle: true' to its OSGI manifest (MANIFEST.MF).
+ * @author Frank (C5163874)
+ *
+ */
+public class ExtenderBundleTracker extends BundleTracker<Bundle> {
+
+    private final Logger logger = Logger.getLogger(ExtenderBundleTracker.class.getName());
+
+    private static int allBundleStatesMask = Bundle.UNINSTALLED | Bundle.INSTALLED | Bundle.RESOLVED | Bundle.STARTING | Bundle.STOPPING | Bundle.ACTIVE;
+    
+    public ExtenderBundleTracker(BundleContext context) {
+        super(context, allBundleStatesMask, null);
+    }
+
+    @Override
+    public Bundle addingBundle(Bundle bundle, BundleEvent event) {
+        String symbolicName = bundle.getSymbolicName();
+        logger.info(symbolicName + " " + getBundleStateAsText(event));
+
+        return bundle;
+    }
+
+    @Override
+    public void modifiedBundle(Bundle bundle, BundleEvent event, Bundle object) {
+        String symbolicName = bundle.getSymbolicName();
+        logger.info(symbolicName + " " + getBundleStateAsText(event));
+
+        if(event != null && event.getType() == BundleEvent.STOPPING) {
+            StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
+            StringBuffer b = new StringBuffer();
+            for(StackTraceElement traceElement: stackTrace) {
+                b.append(traceElement.toString() + "\n");
+            }
+            logger.info(b.toString());
+        }
+        
+        String trackManifestEntry = (String) bundle.getHeaders().get("TrackLifecycle");
+        if (trackManifestEntry != null) {
+            trackLifecycle(bundle, event);
+        }
+    }
+
+    private void trackLifecycle(Bundle bundle, BundleEvent event) {
+        if(event != null) {
+            switch(event.getType()) {
+            case BundleEvent.STOPPING:
+                logger.severe("Bundle " + bundle.getSymbolicName() + " STOPPING");
+                logger.severe("--- " + event);
+                break;
+            case BundleEvent.STOPPED:
+                logger.severe("Bundle " + bundle.getSymbolicName() + " STOPPED");
+                logger.severe("--- " + event);
+                break;
+            }
+        }
+    }
+
+    private String getBundleStateAsText(BundleEvent event) {
+        String bundleState = "";
+        if(event != null) {
+            switch (event.getType()) {
+                case BundleEvent.INSTALLED: bundleState = "INSTALLED";
+                break;
+                case BundleEvent.RESOLVED: bundleState = "RESOLVED";
+                break;
+                case BundleEvent.LAZY_ACTIVATION: bundleState = "LAZY_ACTIVATION";
+                break;
+                case BundleEvent.STARTING: bundleState = "STARTING";
+                break;
+                case BundleEvent.STARTED: bundleState = "STARTED";
+                break;
+                case BundleEvent.STOPPING: bundleState = "STOPPING";
+                break;
+                case BundleEvent.STOPPED: bundleState = "STOPPED";
+                break;
+                case BundleEvent.UPDATED: bundleState = "UPDATED";
+                break;
+                case BundleEvent.UNRESOLVED: bundleState = "UNRESOLVED";
+                break;
+                case BundleEvent.UNINSTALLED: bundleState = "UNINSTALLED";
+                break;
+            }
+        }
+        return bundleState;
+    }
+}

java/com.sap.sailing.server/src/com/sap/sailing/server/admin/ServerCommandProvider.java

@@ -0,0 +1,14 @@
+package com.sap.sailing.server.admin;
+
+import org.eclipse.osgi.framework.console.CommandInterpreter;
+import org.eclipse.osgi.framework.console.CommandProvider;
+
+public class ServerCommandProvider implements CommandProvider {
+    public void _hello(CommandInterpreter ci) {
+        ci.print("Hello, " + ci.nextArgument());
+    }
+
+    public String getHelp() {
+        return "\thello - say hello\n";
+    }
+}