From e5b7380c874745c989d1816b8f552504f038e1bc Mon Sep 17 00:00:00 2001
From: lresende <lresende@13f79535-47bb-0310-9956-ffa450edef68>
Date: Thu, 26 Sep 2013 20:33:20 +0000
Subject: 2.0 branch for possible maintenance release

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1526672 13f79535-47bb-0310-9956-ffa450edef68
---
 .../equinox/OSGiExtensionPointRegistry.java        | 106 +++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 sca-java-2.x/branches/2.0/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/OSGiExtensionPointRegistry.java

(limited to 'sca-java-2.x/branches/2.0/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/OSGiExtensionPointRegistry.java')

diff --git a/sca-java-2.x/branches/2.0/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/OSGiExtensionPointRegistry.java b/sca-java-2.x/branches/2.0/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/OSGiExtensionPointRegistry.java
new file mode 100644
index 0000000000..4b5fffff01
--- /dev/null
+++ b/sca-java-2.x/branches/2.0/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/OSGiExtensionPointRegistry.java
@@ -0,0 +1,106 @@
+/*
+ * 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.extensibility.equinox;
+
+import java.util.Dictionary;
+import java.util.Hashtable;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.tuscany.sca.core.DefaultExtensionPointRegistry;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+import org.osgi.framework.Bundle;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.BundleException;
+import org.osgi.framework.ServiceReference;
+import org.osgi.framework.ServiceRegistration;
+
+/**
+ * OSGi ServiceRegistry based extension point registry
+ */
+public class OSGiExtensionPointRegistry extends DefaultExtensionPointRegistry {
+    private Map<Class<?>, ServiceRegistration> registrations = new ConcurrentHashMap<Class<?>, ServiceRegistration>();
+    private BundleContext bundleContext;
+
+    public OSGiExtensionPointRegistry(BundleContext bundleContext) {
+        super(ServiceDiscovery.getInstance(new EquinoxServiceDiscoverer(bundleContext)));
+        this.bundleContext = bundleContext;
+    }
+
+    @Override
+    protected void registerExtensionPoint(Class<?> extensionPointType,
+                                          Object extensionPoint,
+                                          ServiceDeclaration declaration) {
+        BundleContext context = bundleContext;
+        if (declaration instanceof EquinoxServiceDiscoverer.ServiceDeclarationImpl) {
+            EquinoxServiceDiscoverer.ServiceDeclarationImpl declarationImpl =
+                (EquinoxServiceDiscoverer.ServiceDeclarationImpl)declaration;
+            Bundle bundle = declarationImpl.getBundle();
+            /**
+             * If this bundle is not in the STARTING, ACTIVE, or STOPPING states or this bundle
+             * is a fragment bundle, then this bundle has no valid BundleContext. This method will
+             * return null if this bundle has no valid BundleContext
+             */
+            if ((bundle.getState() & (Bundle.ACTIVE | Bundle.STARTING)) == 0) {
+                try {
+                    bundle.start();
+                } catch (BundleException e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            context = bundle.getBundleContext();
+        }
+        Dictionary<Object, Object> props = new Hashtable<Object, Object>();
+        ServiceRegistration registration = context.registerService(extensionPointType.getName(), extensionPoint, props);
+        registrations.put(extensionPointType, registration);
+        super.registerExtensionPoint(extensionPointType, extensionPoint, declaration);
+    }
+
+    @Override
+    protected void unregisterExtensionPoint(Class<?> i) {
+        ServiceRegistration registration = registrations.remove(i);
+        if (registration != null) {
+            try {
+                registration.unregister();
+            } catch (IllegalStateException e) {
+                // The service has been unregistered, ignore it
+            }        
+        }
+        super.unregisterExtensionPoint(i);
+    }
+
+    @Override
+    public synchronized void stop() {
+        for (ServiceRegistration reg : registrations.values()) {
+            try {
+                ServiceReference ref = reg.getReference();
+                if (ref != null) {
+                    reg.unregister();
+                }
+            } catch (IllegalStateException e) {
+                // Ignore it, the service has been unregistered when the owning bundle stops
+            }
+        }
+        registrations.clear();
+        super.stop();
+    }
+
+}
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