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Diffstat (limited to '')
-rw-r--r-- | sca-java-2.x/tags/2.0-Beta1-RC2/samples/learning-more/implementation-osgi/dosgi-calculator/src/main/java/calculator/dosgi/impl/CalculatorServiceImpl.java | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0-Beta1-RC2/samples/learning-more/implementation-osgi/dosgi-calculator/src/main/java/calculator/dosgi/impl/CalculatorServiceImpl.java b/sca-java-2.x/tags/2.0-Beta1-RC2/samples/learning-more/implementation-osgi/dosgi-calculator/src/main/java/calculator/dosgi/impl/CalculatorServiceImpl.java new file mode 100644 index 0000000000..a9ea37585a --- /dev/null +++ b/sca-java-2.x/tags/2.0-Beta1-RC2/samples/learning-more/implementation-osgi/dosgi-calculator/src/main/java/calculator/dosgi/impl/CalculatorServiceImpl.java @@ -0,0 +1,105 @@ +/* + * 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 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 ServiceTracker remoteServices; + private ServiceTracker localServices; + + public CalculatorServiceImpl() { + super(); + } + + public CalculatorServiceImpl(BundleContext context) { + super(); + Filter remoteFilter = null, localFilter = null; + try { + remoteFilter = + context.createFilter("(&(" + OBJECTCLASS + "=calculator.dosgi.operations.*) (service.imported=*))"); + localFilter = + context.createFilter("(&(" + OBJECTCLASS + "=calculator.dosgi.operations.*) (!(service.imported=*)))"); + } catch (InvalidSyntaxException e) { + e.printStackTrace(); + } + this.remoteServices = new ServiceTracker(context, remoteFilter, null); + remoteServices.open(); + this.localServices = new ServiceTracker(context, localFilter, null); + localServices.open(); + } + + private <T> T getService(Class<T> cls) { + try { + // Wait for 10 seconds until the remote services are imported + remoteServices.waitForService(10000); + } catch (InterruptedException e) { + throw new IllegalStateException(cls.getSimpleName() + " is not available"); + } + Object[] remoteObjects = remoteServices.getServices(); + if (remoteObjects != null) { + for (Object s : remoteObjects) { + if (cls.isInstance(s)) { + System.out.println("Remote service: " + s); + return cls.cast(s); + } + } + } + Object[] localObjects = localServices.getServices(); + if (localObjects != null) { + for (Object s : localObjects) { + if (cls.isInstance(s)) { + System.out.println("Local 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); + } +} |