1 files changed, 40 insertions, 0 deletions
diff --git a/container-core/src/main/java/com/yahoo/container/core/config/BundleStarter.java b/container-core/src/main/java/com/yahoo/container/core/config/BundleStarter.java
new file mode 100644
index 00000000000..4a87c27b990
--- /dev/null
+++ b/container-core/src/main/java/com/yahoo/container/core/config/BundleStarter.java
@@ -0,0 +1,40 @@
+package com.yahoo.container.core.config;
+
+import org.osgi.framework.Bundle;
+import org.osgi.framework.wiring.BundleRevision;
+
+import java.util.Collection;
+
+/**
+ * Utility to start a collection of bundles.
+ *
+ * @author gjoranv
+ */
+public class BundleStarter {
+
+    private BundleStarter() { }
+
+    /**
+     * Resolves and starts (calls the Bundles BundleActivator) all bundles. Bundle resolution must take place
+     * after all bundles are installed to ensure that the framework can resolve dependencies between bundles.
+     */
+    static void startBundles(Collection<Bundle> bundles) {
+        for (var bundle : bundles) {
+            try {
+                if ( ! isFragment(bundle))
+                    bundle.start();  // NOP for already ACTIVE bundles
+            } catch(Exception e) {
+                throw new RuntimeException("Could not start bundle '" + bundle.getSymbolicName() + "'", e);
+            }
+        }
+    }
+
+    private static boolean isFragment(Bundle bundle) {
+        BundleRevision bundleRevision = bundle.adapt(BundleRevision.class);
+        if (bundleRevision == null)
+            throw new NullPointerException("Null bundle revision means that bundle has probably been uninstalled: " +
+                                                   bundle.getSymbolicName() + ":" + bundle.getVersion());
+        return (bundleRevision.getTypes() & BundleRevision.TYPE_FRAGMENT) != 0;
+    }
+
+}