1 files changed, 99 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/samples/learning-more/distributed-osgi-dynamic/calculator-bundle/src/main/java/calculator/dosgi/impl/CalculatorServiceImpl.java b/sca-java-2.x/tags/2.0.1-RC1/samples/learning-more/distributed-osgi-dynamic/calculator-bundle/src/main/java/calculator/dosgi/impl/CalculatorServiceImpl.java
new file mode 100644
index 0000000000..c22706c9f6
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/samples/learning-more/distributed-osgi-dynamic/calculator-bundle/src/main/java/calculator/dosgi/impl/CalculatorServiceImpl.java
@@ -0,0 +1,99 @@
+/*
+ * 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 calculator.dosgi.impl;
+
+import static org.osgi.framework.Constants.OBJECTCLASS;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.Filter;
+import org.osgi.framework.InvalidSyntaxException;
+import org.osgi.util.tracker.ServiceTracker;
+
+import calculator.dosgi.CalculatorService;
+import calculator.dosgi.operations.AddService;
+import calculator.dosgi.operations.DivideService;
+import calculator.dosgi.operations.MultiplyService;
+import calculator.dosgi.operations.SubtractService;
+
+/**
+ * An implementation of the Calculator service.
+ */
+public class CalculatorServiceImpl implements CalculatorService {
+    private Map<Class<?>, ServiceTracker> remoteServices = new HashMap<Class<?>, ServiceTracker>();
+
+    public CalculatorServiceImpl() {
+        super();
+    }
+
+    public CalculatorServiceImpl(BundleContext context) {
+        super();
+        for (Class<?> cls : new Class<?>[] {AddService.class, SubtractService.class, MultiplyService.class,
+                                            DivideService.class}) {
+            Filter remoteFilter = null;
+            try {
+                remoteFilter =
+                    context.createFilter("(&(" + OBJECTCLASS + "=" + cls.getName() + ") (service.imported=*))");
+            } catch (InvalidSyntaxException e) {
+                e.printStackTrace();
+            }
+            ServiceTracker tracker = new ServiceTracker(context, remoteFilter, null);
+            this.remoteServices.put(cls, tracker);
+            tracker.open();
+        }
+    }
+
+    private <T> T getService(Class<T> cls) {
+        ServiceTracker tracker = remoteServices.get(cls);
+        try {
+            // Wait for 10 seconds until the remote services are imported
+            tracker.waitForService(10000);
+        } catch (InterruptedException e) {
+            throw new IllegalStateException(cls.getSimpleName() + " is not available");
+        }
+        Object[] remoteObjects = tracker.getServices();
+        if (remoteObjects != null) {
+            for (Object s : remoteObjects) {
+                if (cls.isInstance(s)) {
+                    System.out.println("Remote service: " + s);
+                    return cls.cast(s);
+                }
+            }
+        }
+        throw new IllegalStateException(cls.getSimpleName() + " is not available");
+    }
+
+    public double add(double n1, double n2) {
+        return getService(AddService.class).add(n1, n2);
+    }
+
+    public double subtract(double n1, double n2) {
+        return getService(SubtractService.class).subtract(n1, n2);
+    }
+
+    public double multiply(double n1, double n2) {
+        return getService(MultiplyService.class).multiply(n1, n2);
+    }
+
+    public double divide(double n1, double n2) {
+        return getService(DivideService.class).divide(n1, n2);
+    }
+}