| package org.eclipse.basyx.examples.snippets.vab; |
| |
| import static org.junit.Assert.assertTrue; |
| |
| import java.io.Serializable; |
| import java.util.Map; |
| import java.util.function.Supplier; |
| |
| import org.eclipse.basyx.components.servlet.vab.VABLambdaServlet; |
| import org.eclipse.basyx.examples.contexts.BaSyxExamplesContext; |
| import org.eclipse.basyx.examples.deployment.BaSyxDeployment; |
| import org.eclipse.basyx.examples.support.directory.ExamplesPreconfiguredDirectory; |
| import org.eclipse.basyx.vab.manager.VABConnectionManager; |
| import org.eclipse.basyx.vab.modelprovider.VABElementProxy; |
| import org.eclipse.basyx.vab.modelprovider.lambda.VABLambdaProviderHelper; |
| import org.eclipse.basyx.vab.protocol.http.connector.HTTPConnectorProvider; |
| import org.junit.ClassRule; |
| import org.junit.Test; |
| |
| |
| |
| /** |
| * Code snippet that illustrates the dynamic deployment of VAB object operations with |
| * Lambda expressions |
| * |
| * The snippet communicates with a VAB element that is deployed to a VABLambdaServlet on a |
| * Apache Tomcat HTTP server instance. The VABLambdaServlet provides an empty container that |
| * is able to host any VAB object. It supports dynamic properties with lambda expressions, |
| * i.e. all get/set/create/delete operations for every property may be replaced with a |
| * lambda operation. |
| * |
| * |
| * @author kuhn |
| * |
| */ |
| public class DynamicPropertyLambda { |
| |
| |
| /** |
| * VAB connection manager backend |
| * |
| * The connection manager uses a preconfigured directory for resolving IDs to |
| * network addresses, and a HTTP connector to connect to VAB objects. |
| */ |
| protected VABConnectionManager connManager = new VABConnectionManager( |
| new ExamplesPreconfiguredDirectory() |
| // Add example specific mappings |
| .addMapping("urn:de.FHG:devices.es.iese:statusSM:1.0:3:x-509#003", "http://localhost:8080/basys.examples/Testsuite/components/BaSys/1.0/devicestatusVAB/"), |
| new HTTPConnectorProvider()); |
| |
| |
| /** |
| * The BaSyx Deployment instantiates and starts context elements for this example. |
| * |
| * This example instantiates the BaSyxExamplesContext_1MemoryAASServer_1SQLDirectory |
| * example context that creates one AAS server, and one SQL based AAS registry. |
| * |
| * BaSyxDeployment contexts instantiate all components on the IP address of the host. |
| * Therefore, all components use the same IP address. |
| */ |
| @ClassRule |
| public static BaSyxDeployment context = new BaSyxDeployment( |
| // Simulated servlets |
| // - BaSys topology with one AAS Server and one SQL directory |
| new BaSyxExamplesContext(). |
| // Deploy example specific servlets to Tomcat server in this context |
| addServletMapping("/Testsuite/components/BaSys/1.0/devicestatusVAB/*", new VABLambdaServlet()) |
| ); |
| |
| |
| |
| |
| /** |
| * Run code snippet. This code snippet illustrates the creation and uploading |
| * of dynamic operations on a EmptyVABLambdaElementServlet servlet. |
| */ |
| @Test |
| public void snippet() throws Exception { |
| |
| // Server connections |
| // - Connect to VAB object by ID. The connection manager looks up this ID in |
| // its directory |
| VABElementProxy connSubModel1 = this.connManager.connectToVABElement("urn:de.FHG:devices.es.iese:statusSM:1.0:3:x-509#003"); |
| |
| |
| // Create dynamic get/operation as Lambda expression, no set operation (null) is provided. |
| Map<String, Object> dynamicPropertyVal = VABLambdaProviderHelper.createSimple((Supplier<Object> & Serializable) () -> { |
| return "dynamicExampleValue"; |
| }, null); |
| // - Update property properties/dynamicExample with dynamic get/set operation |
| connSubModel1.createValue("dynamicExampleProperty", dynamicPropertyVal); |
| |
| // Read dynamicExample property |
| // - This will invoke the previously uploaded Lambda expression |
| Object propertyValue = connSubModel1.getModelPropertyValue("dynamicExampleProperty"); |
| |
| |
| // Compare returned to expected values |
| assertTrue(propertyValue.equals("dynamicExampleValue")); |
| } |
| } |
| |