ipojo/tests/core/service-dependency/src/main/java/org/apache/felix/ipojo/test/scenarios/service/dependency/DependencyArchitectureTest.java

/* 
 * 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
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package org.apache.felix.ipojo.test.scenarios.service.dependency;

import java.util.Properties;

import org.apache.felix.ipojo.ComponentInstance;
import org.apache.felix.ipojo.architecture.Architecture;
import org.apache.felix.ipojo.architecture.InstanceDescription;
import org.apache.felix.ipojo.handlers.dependency.DependencyHandlerDescription;
import org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandlerDescription;
import org.apache.felix.ipojo.junit4osgi.OSGiTestCase;
import org.apache.felix.ipojo.test.scenarios.util.Utils;
import org.osgi.framework.ServiceReference;

import org.apache.felix.ipojo.test.scenarios.service.dependency.service.CheckService;
import org.apache.felix.ipojo.test.scenarios.service.dependency.service.FooService;

public class DependencyArchitectureTest extends OSGiTestCase {
	
	ComponentInstance fooProvider1, fooProvider2;
	
	ComponentInstance instance1, instance2, instance3, instance4;
	
	public void setUp() {
		try {
			Properties prov = new Properties();
			prov.put("instance.name","FooProvider");
			fooProvider1 = Utils.getFactoryByName(getContext(), "FooProviderType-1").createComponentInstance(prov);
			fooProvider1.stop();
		
			Properties prov2 = new Properties();
			prov2.put("instance.name","FooProvider2");
			fooProvider2 = Utils.getFactoryByName(getContext(), "FooProviderType-1").createComponentInstance(prov2);
			fooProvider2.stop();
		
			Properties i1 = new Properties();
			i1.put("instance.name","Simple");
			instance1 = Utils.getFactoryByName(getContext(), "SimpleCheckServiceProvider").createComponentInstance(i1);
		
			Properties i2 = new Properties();
			i2.put("instance.name","Optional");
			instance2 = Utils.getFactoryByName(getContext(), "SimpleOptionalCheckServiceProvider").createComponentInstance(i2);
		
			Properties i3 = new Properties();
			i3.put("instance.name","Multiple");
			instance3 = Utils.getFactoryByName(getContext(), "SimpleMultipleCheckServiceProvider").createComponentInstance(i3);
		
			Properties i4 = new Properties();
			i4.put("instance.name","OptionalMultiple");
			instance4 = Utils.getFactoryByName(getContext(), "SimpleOptionalMultipleCheckServiceProvider").createComponentInstance(i4);
		} catch(Exception e) {
			throw new RuntimeException(e.getMessage());
		}
	}
	
	public void tearDown() {
		instance1.dispose();
		instance2.dispose();
		instance3.dispose();
		instance4.dispose();
		fooProvider1.dispose();
		fooProvider2.dispose();
		instance1 = null;
		instance2 = null;
		instance3 = null;
		instance4 = null;
		fooProvider1 = null;
		fooProvider2 = null;
	}
	
	private DependencyHandlerDescription getDependencyDesc(InstanceDescription id) {
		for(int i = 0; i < id.getHandlers().length; i++) {
			if(id.getHandlers()[i].getHandlerName().equals("org.apache.felix.ipojo.handlers.dependency.DependencyHandler")) {
				return (DependencyHandlerDescription) id.getHandlers()[i];
			}
		}
		fail("Dependency Handler not found");
		return null;
	}
	
	private ProvidedServiceHandlerDescription getPSDesc(InstanceDescription id) {
		for(int i = 0; i < id.getHandlers().length; i++) {
			if(id.getHandlers()[i].getHandlerName().equals("org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler")) {
				return (ProvidedServiceHandlerDescription) id.getHandlers()[i];
			}
		}
		fail("Provided Service Handler not found");
		return null;
	}
	
	public void testSimpleDependency() {
		ServiceReference arch_dep = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), instance1.getInstanceName());
		assertNotNull("Check architecture availability", arch_dep);
		InstanceDescription id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_dep.getState() == ComponentInstance.INVALID);
		
		// Check dependency handler invalidity
		DependencyHandlerDescription dhd = getDependencyDesc(id_dep);
		assertFalse("Check dependency handler invalidity", dhd.isValid());
		
		// Check dependency metadata
		assertEquals("Check dependency interface", dhd.getDependencies()[0].getInterface(), FooService.class.getName());
		assertEquals("Check dependency id", dhd.getDependencies()[0].getId(), FooService.class.getName());
		assertFalse("Check dependency cardinality", dhd.getDependencies()[0].isMultiple());
		assertFalse("Check dependency optionality", dhd.getDependencies()[0].isOptional());
		assertNull("Check dependency ref -1", dhd.getDependencies()[0].getServiceReferences());
		
		fooProvider1.start();
		
		ServiceReference arch_ps = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps);
		InstanceDescription id_ps = ((Architecture) getContext().getService(arch_ps)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps.getState() == ComponentInstance.VALID);				
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler validity", dhd.isValid());
		assertEquals("Check dependency ref - 2 ", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		
		ServiceReference cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance1.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		CheckService cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps = ((Architecture) getContext().getService(arch_ps)).getInstanceDescription();
		ProvidedServiceHandlerDescription psh = getPSDesc(id_ps);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertEquals("Check POJO creation", id_ps.getCreatedObjects().length, 1);
		assertTrue("Check service reference - 1", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));
		
		fooProvider1.stop();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 2", id_dep.getState() == ComponentInstance.INVALID);
		dhd = getDependencyDesc(id_dep);
		assertFalse("Check dependency handler invalidity", dhd.isValid());
		
		fooProvider1.start();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		arch_ps = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps);
		id_ps = ((Architecture) getContext().getService(arch_ps)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps.getState() == ComponentInstance.VALID);
		psh = getPSDesc(id_ps);
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		assertTrue("Check dependency handler validity", dhd.isValid());
		
		assertEquals("Check dependency ref -3", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		
		cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance1.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph 
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps = ((Architecture) getContext().getService(arch_ps)).getInstanceDescription();
		psh = getPSDesc(id_ps);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertTrue("Check service reference - 1", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));
		
		fooProvider1.stop();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 2", id_dep.getState() == ComponentInstance.INVALID);
		dhd = getDependencyDesc(id_dep);
		assertFalse("Check dependency handler invalidity", dhd.isValid());
		
		id_dep = null;
		cs = null;
		getContext().ungetService(arch_dep);
		getContext().ungetService(cs_ref);
	}
	
	public void testOptionalDependency() {
		ServiceReference arch_dep = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), instance2.getInstanceName());
		assertNotNull("Check architecture availability", arch_dep);
		InstanceDescription id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_dep.getState() == ComponentInstance.VALID);
		
		// Check dependency handler invalidity
		DependencyHandlerDescription dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler invalidity", dhd.isValid());
		
		// Check dependency metadata
		assertEquals("Check dependency interface", dhd.getDependencies()[0].getInterface(), FooService.class.getName());
	    assertEquals("Check dependency id", dhd.getDependencies()[0].getId(), "FooService");
		assertFalse("Check dependency cardinality", dhd.getDependencies()[0].isMultiple());
		assertTrue("Check dependency optionality", dhd.getDependencies()[0].isOptional());
		assertNull("Check dependency ref -1", dhd.getDependencies()[0].getServiceReferences());
		
		fooProvider1.start();
		
		ServiceReference arch_ps = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps);
		InstanceDescription id_ps = ((Architecture) getContext().getService(arch_ps)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps.getState() == ComponentInstance.VALID);				
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler validity", dhd.isValid());
		assertEquals("Check dependency ref - 2 ", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		
		ServiceReference cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance2.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		CheckService cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps = ((Architecture) getContext().getService(arch_ps)).getInstanceDescription();
		ProvidedServiceHandlerDescription psh = getPSDesc(id_ps);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertEquals("Check POJO creation", id_ps.getCreatedObjects().length, 1);
		assertTrue("Check service reference - 1", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));
		
		fooProvider1.stop();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 2", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler invalidity", dhd.isValid());
		
		fooProvider1.start();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		arch_ps = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps);
		id_ps = ((Architecture) getContext().getService(arch_ps)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps.getState() == ComponentInstance.VALID);
		psh = getPSDesc(id_ps);
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		assertTrue("Check dependency handler validity", dhd.isValid());
		
		assertEquals("Check dependency ref -3", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		
		cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance2.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph 
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps = ((Architecture) getContext().getService(arch_ps)).getInstanceDescription();
		psh = getPSDesc(id_ps);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertTrue("Check service reference - 1", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));
		
		fooProvider1.stop();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 2", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler invalidity", dhd.isValid());
		
		id_dep = null;
		cs = null;
		getContext().ungetService(arch_dep);
		getContext().ungetService(cs_ref);
	}
	
	public void testMultipleDependency() {
		ServiceReference arch_dep = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), instance3.getInstanceName());
		assertNotNull("Check architecture availability", arch_dep);
		InstanceDescription id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_dep.getState() == ComponentInstance.INVALID);
		
		// Check dependency handler invalidity
		DependencyHandlerDescription dhd = getDependencyDesc(id_dep);
		assertFalse("Check dependency handler invalidity", dhd.isValid());
		
		// Check dependency metadata
		assertEquals("Check dependency interface", dhd.getDependencies()[0].getInterface(), FooService.class.getName());
		assertTrue("Check dependency cardinality", dhd.getDependencies()[0].isMultiple());
		assertFalse("Check dependency optionality", dhd.getDependencies()[0].isOptional());
		assertNull("Check dependency ref -1", dhd.getDependencies()[0].getServiceReferences());
		
		fooProvider1.start();
		
		ServiceReference arch_ps1 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps1);
		InstanceDescription id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		assertTrue("Check instance validity - 1", id_ps1.getState() == ComponentInstance.VALID);				
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler validity", dhd.isValid());
		assertEquals("Check dependency ref - 2 ", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		assertEquals("Check used ref - 1 (" + dhd.getDependencies()[0].getUsedServices().size() + ")", dhd.getDependencies()[0].getUsedServices().size(), 0);
		
		ServiceReference cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance3.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		CheckService cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		ProvidedServiceHandlerDescription psh = getPSDesc(id_ps1);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertEquals("Check POJO creation", id_ps1.getCreatedObjects().length, 1);
		assertTrue("Check service reference - 2", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));
		
		// Start a second foo service provider
		fooProvider2.start();
		
		arch_ps1 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		ServiceReference arch_ps2 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider2.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps1);
		assertNotNull("Check architecture 2 availability", arch_ps2);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		InstanceDescription id_ps2 = ((Architecture) getContext().getService(arch_ps2)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps1.getState() == ComponentInstance.VALID);
		assertTrue("Check instance 2 invalidity - 1", id_ps2.getState() == ComponentInstance.VALID);
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler validity", dhd.isValid());
		assertEquals("Check dependency ref - 3 ", dhd.getDependencies()[0].getServiceReferences().size(), 2);
		assertEquals("Check used ref - 2 ", dhd.getDependencies()[0].getUsedServices().size(), 1); // provider 2 not already used
		
		cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance3.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		id_ps2 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		ProvidedServiceHandlerDescription psh1 = getPSDesc(id_ps1);
		ProvidedServiceHandlerDescription psh2 = getPSDesc(id_ps2);
		assertEquals("Check POJO creation", id_ps1.getCreatedObjects().length, 1);
		assertEquals("Check POJO creation", id_ps2.getCreatedObjects().length, 1);
		assertTrue("Check service reference - 3.1", dhd.getDependencies()[0].getUsedServices().contains(psh1.getProvidedServices()[0].getServiceReference()));
		assertTrue("Check service reference - 3.2", dhd.getDependencies()[0].getUsedServices().contains(psh2.getProvidedServices()[0].getServiceReference()));
		assertEquals("Check used ref - 3 ("+dhd.getDependencies()[0].getUsedServices().size()+")", dhd.getDependencies()[0].getUsedServices().size(), 2);
		
		fooProvider2.stop();
		
		arch_ps1 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps1);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		assertTrue("Check instance validity - 1", id_ps1.getState() == ComponentInstance.VALID);				
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler validity", dhd.isValid());
		assertEquals("Check dependency ref - 2 ", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		assertEquals("Check used ref - 4 ", dhd.getDependencies()[0].getUsedServices().size(), 1);
		
		cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance3.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		psh = getPSDesc(id_ps1);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertEquals("Check POJO creation", id_ps1.getCreatedObjects().length, 1);
		assertTrue("Check service reference - 1", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));
		assertEquals("Check used ref - 5 ", dhd.getDependencies()[0].getUsedServices().size(), 1);
		
		fooProvider1.stop();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertFalse("Check instance invalidity - 2", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertFalse("Check dependency handler invalidity", dhd.isValid());
		
		fooProvider2.start();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		arch_ps1 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider2.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps1);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps1.getState() == ComponentInstance.VALID);
		psh = getPSDesc(id_ps1);
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		assertTrue("Check dependency handler validity", dhd.isValid());
		
		assertEquals("Check dependency ref -3", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		assertEquals("Check used ref - 6 ", dhd.getDependencies()[0].getUsedServices().size(), 0);
		
		cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance3.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph 
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		psh = getPSDesc(id_ps1);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertTrue("Check service reference - 4", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));
		assertEquals("Check used ref - 7 ", dhd.getDependencies()[0].getUsedServices().size(), 1);
		
		fooProvider2.stop();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertFalse("Check instance invalidity - 2", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertFalse("Check dependency handler invalidity", dhd.isValid());
		
		id_dep = null;
		cs = null;
		getContext().ungetService(arch_dep);
		getContext().ungetService(cs_ref);
	}
	
	public void testMultipleOptionalDependency() {
		ServiceReference arch_dep = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), instance4.getInstanceName());
		assertNotNull("Check architecture availability", arch_dep);
		InstanceDescription id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_dep.getState() == ComponentInstance.VALID);
		
		// Check dependency handler invalidity
		DependencyHandlerDescription dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler invalidity", dhd.isValid());
		
		// Check dependency metadata
		assertEquals("Check dependency interface", dhd.getDependencies()[0].getInterface(), FooService.class.getName());
		assertTrue("Check dependency cardinality", dhd.getDependencies()[0].isMultiple());
		assertTrue("Check dependency optionality", dhd.getDependencies()[0].isOptional());
		assertNull("Check dependency ref -1", dhd.getDependencies()[0].getServiceReferences());
		
		fooProvider1.start();
		
		ServiceReference arch_ps1 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps1);
		InstanceDescription id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps1.getState() == ComponentInstance.VALID);				
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler validity", dhd.isValid());
		assertEquals("Check dependency ref - 2 ", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		
		ServiceReference cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance4.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		CheckService cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		ProvidedServiceHandlerDescription psh = getPSDesc(id_ps1);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertEquals("Check POJO creation", id_ps1.getCreatedObjects().length, 1);
		assertTrue("Check service reference - 1", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));
		
		// Start a second foo service provider
		fooProvider2.start();
		
		arch_ps1 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		ServiceReference arch_ps2 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider2.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps1);
		assertNotNull("Check architecture 2 availability", arch_ps2);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		InstanceDescription id_ps2 = ((Architecture) getContext().getService(arch_ps2)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps1.getState() == ComponentInstance.VALID);
		assertTrue("Check instance 2 invalidity - 1", id_ps2.getState() == ComponentInstance.VALID);
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler validity", dhd.isValid());
		assertEquals("Check dependency ref - 3 ", dhd.getDependencies()[0].getServiceReferences().size(), 2);
		
		cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance4.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		id_ps2 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		ProvidedServiceHandlerDescription psh1 = getPSDesc(id_ps1);
		ProvidedServiceHandlerDescription psh2 = getPSDesc(id_ps2);
		assertEquals("Check POJO creation", id_ps1.getCreatedObjects().length, 1);
		assertEquals("Check POJO creation", id_ps2.getCreatedObjects().length, 1);
		assertTrue("Check service reference - 2.1", dhd.getDependencies()[0].getUsedServices().contains(psh1.getProvidedServices()[0].getServiceReference()));
		assertTrue("Check service reference - 2.2", dhd.getDependencies()[0].getUsedServices().contains(psh2.getProvidedServices()[0].getServiceReference()));
		
		fooProvider2.stop();
		
		arch_ps1 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider1.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps1);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps1.getState() == ComponentInstance.VALID);				
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler validity", dhd.isValid());
		assertEquals("Check dependency ref - 2 ", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		
		cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance4.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		psh = getPSDesc(id_ps1);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertEquals("Check POJO creation", id_ps1.getCreatedObjects().length, 1);
		assertTrue("Check service reference - 3", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));

		fooProvider1.stop();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 2", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler invalidity", dhd.isValid());
		
		fooProvider2.start();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		arch_ps1 = Utils.getServiceReferenceByName(getContext(), Architecture.class.getName(), fooProvider2.getInstanceName());
		assertNotNull("Check architecture availability", arch_ps1);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		assertTrue("Check instance invalidity - 1", id_ps1.getState() == ComponentInstance.VALID);
		psh = getPSDesc(id_ps1);
		assertTrue("Check instance validity", id_dep.getState() == ComponentInstance.VALID);
		assertTrue("Check dependency handler validity", dhd.isValid());
		
		assertEquals("Check dependency ref -3", dhd.getDependencies()[0].getServiceReferences().size(), 1);
		
		cs_ref = Utils.getServiceReferenceByName(getContext(), CheckService.class.getName(), instance4.getInstanceName());
		assertNotNull("Check CheckService availability", cs_ref);
		cs = (CheckService) getContext().getService(cs_ref);
		assertTrue("check CheckService invocation", cs.check());
		
		// Check object graph 
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		dhd = getDependencyDesc(id_dep);
		id_ps1 = ((Architecture) getContext().getService(arch_ps1)).getInstanceDescription();
		psh = getPSDesc(id_ps1);
		assertEquals("Check Service Reference equality", psh.getProvidedServices()[0].getServiceReference(), dhd.getDependencies()[0].getServiceReference());
		assertTrue("Check service reference - 4", dhd.getDependencies()[0].getUsedServices().contains(psh.getProvidedServices()[0].getServiceReference()));

		fooProvider2.stop();
		
		id_dep = ((Architecture) getContext().getService(arch_dep)).getInstanceDescription();
		assertTrue("Check instance invalidity - 2", id_dep.getState() == ComponentInstance.VALID);
		dhd = getDependencyDesc(id_dep);
		assertTrue("Check dependency handler invalidity", dhd.isValid());
		
		id_dep = null;
		cs = null;
		getContext().ungetService(arch_dep);
		getContext().ungetService(cs_ref);
	}
	
	
	
}