Start to hook up the osgi-based node

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@755018 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 196 insertions, 0 deletions

diff --git a/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeActivator.java b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeActivator.java
new file mode 100644
index 0000000000..42ae9d89f3
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeActivator.java
@@ -0,0 +1,84 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.node.osgi.impl;
+
+import static org.apache.tuscany.sca.node.osgi.impl.NodeManager.isSCABundle;
+
+import org.osgi.framework.Bundle;
+import org.osgi.framework.BundleActivator;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.BundleEvent;
+import org.osgi.framework.SynchronousBundleListener;
+
+/**
+ * Bundle activator to receive the BundleContext
+ */
+public class NodeActivator implements BundleActivator, SynchronousBundleListener {
+    private static BundleContext bundleContext;
+    private boolean inited;
+
+    private void init() {
+        synchronized (this) {
+            if (inited) {
+                return;
+            }
+            NodeManager manager = new NodeManager(bundleContext);
+            manager.start();
+            bundleContext.addBundleListener(manager);
+            inited = true;
+        }
+    }
+
+    public void start(BundleContext context) throws Exception {
+        bundleContext = context;
+        boolean found = false;
+        for (Bundle b : context.getBundles()) {
+            if (isSCABundle(b)) {
+                found = true;
+                break;
+            }
+        }
+
+        if (found) {
+            init();
+        } else {
+            context.addBundleListener(this);
+        }
+    }
+
+    public void stop(BundleContext context) throws Exception {
+        context.removeBundleListener(this);
+        bundleContext = null;
+    }
+
+    public static BundleContext getBundleContext() {
+        return bundleContext;
+    }
+
+    public void bundleChanged(BundleEvent event) {
+        if (event.getType() == BundleEvent.STARTING) {
+            if (isSCABundle(event.getBundle())) {
+                init();
+            }
+        }
+
+    }
+
+}
diff --git a/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeManager.java b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeManager.java
new file mode 100644
index 0000000000..68575b6c74
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeManager.java
@@ -0,0 +1,112 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.node.osgi.impl;
+
+import java.util.Dictionary;
+import java.util.Enumeration;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.osgi.framework.Bundle;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.BundleEvent;
+import org.osgi.framework.ServiceEvent;
+import org.osgi.framework.ServiceListener;
+import org.osgi.framework.SynchronousBundleListener;
+
+/**
+ * Managing the mapping between OSGi bundles and SCA implementation.osgi
+ */
+public class NodeManager implements SynchronousBundleListener, ServiceListener {
+    private BundleContext bundleContext;
+    private Map<Bundle, NodeImpl> nodes = new ConcurrentHashMap<Bundle, NodeImpl>();
+
+    public NodeManager(BundleContext bundleContext) {
+        super();
+        this.bundleContext = bundleContext;
+    }
+
+    public void start() {
+        for (Bundle b : bundleContext.getBundles()) {
+            if ((b.getState() & Bundle.ACTIVE) != 0) {
+                // Process the active bundles
+                bundleStarted(b);
+            }
+        }
+    }
+
+    public static boolean isSCABundle(Bundle bundle) {
+        Dictionary<?, ?> headers = bundle.getHeaders();
+        // OSGi RFC 119 SCA
+        if (headers.get("SCA-Composite") != null) {
+            return true;
+        }
+        Enumeration<?> entries = bundle.findEntries("OSGI-INF/sca", "*", false);
+        if (entries != null && entries.hasMoreElements()) {
+            return true;
+        }
+
+        // OSGi Declarative Services
+        if (headers.get("Service-Component") != null) {
+            return true;
+        }
+
+        // OSGI RFC 124: BluePrint Service
+        if (headers.get("Bundle-Blueprint") != null) {
+            return true;
+        }
+
+        entries = bundle.findEntries("OSGI-INF/blueprint", "*.xml", false);
+        if (entries != null && entries.hasMoreElements()) {
+            return true;
+        }
+        return false;
+    }
+
+    private void bundleStarted(Bundle bundle) {
+        if (!isSCABundle(bundle)) {
+            return;
+        }
+        NodeImpl node = new NodeImpl(bundle);
+        nodes.put(bundle, node);
+        node.start();
+    }
+
+    private void bundleStopping(Bundle bundle) {
+        NodeImpl node = nodes.remove(bundle);
+        if (node == null) {
+            return;
+        }
+        node.stop();
+    }
+
+    public void serviceChanged(ServiceEvent event) {
+    }
+
+    public void bundleChanged(BundleEvent event) {
+        int type = event.getType();
+        if (type == BundleEvent.STOPPING) {
+            bundleStopping(event.getBundle());
+        } else if (type == BundleEvent.STARTED) {
+            bundleStarted(event.getBundle());
+        }
+    }
+
+}