{"id":37011,"date":"2015-02-16T19:00:33","date_gmt":"2015-02-16T17:00:33","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=37011"},"modified":"2015-02-12T12:59:29","modified_gmt":"2015-02-12T10:59:29","slug":"osgi-service-test-helper-serviceregistrationrule","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2015\/02\/osgi-service-test-helper-serviceregistrationrule.html","title":{"rendered":"OSGi Service Test Helper: ServiceRegistrationRule"},"content":{"rendered":"

OSGi<\/a> Service Tests can be an efficient means to avoid problems related to dangling service references. As promised in my post about writing simple service contribution verifications<\/a>, this time I introduce a JUnit rule<\/a> that assists in testing interactions between components.<\/p>\n

OSGi Service Tests for Component Interaction<\/h2>\n

Assume we have a service that notifies related observers bound according to the whiteboard-pattern<\/a>. Precisely we have a Service<\/code> declaration and ServiceImpl<\/code> as in the previous post. Additionaly we support ServiceListener<\/code>s that should be notified on particular actions.<\/p>\n

To represent such an action we broaden the service interface of our example with a method declaration called Service#execute()<\/code>:<\/p>\n

public interface Service {\r\n  void execute();\r\n}<\/pre>\n
Beside the implementation of this execute<\/code> method the contribution class have to provide the capabilities to bind and unbind ServiceListener<\/code> references:<\/p>\n
public class ServiceImpl\r\n  implements Service\r\n{\r\n  public void execute() {\r\n    [...]\r\n  }\r\n\r\n  public void bind( ServiceListener listener ) {\r\n    [...]\r\n  }\r\n\r\n  public void unbind( ServiceListener listener ) {\r\n    [...]\r\n  }\r\n}<\/pre>\n
As notification destination the callback type ServiceListener<\/code>s provides a method declaration called ServiceListener#executed()<\/code>:<\/p>\n
public interface ServiceListener {\r\n  void executed();\r\n}<\/pre>\n
To complete the setup we have to register the service component, which we do again via declarative services<\/a>. Note the additional 0..n reference declaration:<\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<scr:component\r\n  xmlns:scr=\"http:\/\/www.osgi.org\/xmlns\/scr\/v1.1.0\"\r\n  immediate=\"true\" \r\n  name=\"Implementation of Service API\">\r\n  <implementation class=\"com.codeaffine.example.core.ServiceImpl\"\/>\r\n  <service<\r\n    <provide interface=\"com.codeaffine.example.api.Service\"\/>\r\n  <\/service>\r\n  <reference \r\n    bind=\"bind\" \r\n    unbind=\"unbind\"\r\n    cardinality=\"0..n\"\r\n    interface=\"com.codeaffine.example.api.ServiceListener\"\r\n    name=\"ServiceListener\"\r\n    policy=\"dynamic\" \/>\r\n<\/scr:component><\/pre>\n
Now the question is: How can we test that un-\/binding of a listener works correctly and notifications are dispatched as expected? The basic idea is to register a ServiceListener<\/code> spy<\/a> and trigger Service#execute<\/code> on the actual service implementation.
 
<\/div> <\/div><\/p>\n
The spy records calls to execute<\/code> and allows to verify that binding and notification<\/em> work as expected. Once we have ensured this, we can go on and deregister a primarily registered spy and verify that it is not notified about a subsequent action event. This makes sure unbinding works also as planned.<\/p>\n
However the test fixture<\/a> for this scenario usually needs a bit of OSGi boilerplate. To reduce the clutter I have written a little JUnit rule that eases service registration and automatically performs a service registry cleanup after each test run.<\/p>\n
ServiceRegistrationRule<\/h2>\n
As every other JUnit TestRule<\/code> the ServiceRegistrationRule<\/code> has to be provided as a public field in our PDE test<\/a>. Note how the rule uses a parameterized constructor given the class instance of the test case. This reference is used to get hold of an appropriate BundleContext<\/code> for service de-\/registration.<\/p>\n
@Rule\r\npublic final ServiceRegistrationRule serviceRegistration\r\n  = new ServiceRegistrationRule( getClass() );\r\n\r\nprivate ServiceListener listener;\r\nprivate Service service;\r\n\r\n@Before\r\npublic void setUp() {\r\n  service = collectServices( Service.class, ServiceImpl.class ).get( 0 );\r\n  listener = mock( ServiceListener.class );\r\n}<\/pre>\n
The implicit test setup<\/a> retrieves the registered service under test<\/em> using the ServiceCollector<\/code> I introduced in the last post<\/a>. The listener DOC<\/a> is created as spy using mockito<\/a>. The first test scenario described above looks like this:<\/p>\n
@Test\r\npublic void executeNotification() {\r\n  serviceRegistration.register( ServiceListener.class, listener );\r\n\r\n  service.execute();\r\n\r\n  verify( listener ).executed();\r\n}<\/pre>\n
Pretty straight forward, isn\u2019t it?<\/p>\n
Note that the ServiceRegistrationRule<\/code> takes care of cleanup and removes the spy service from the service registry. To facilitate a test for the unbind scenario, the rule\u2019s register<\/code> method returns a handle to the service registration:<\/p>\n
@Test\r\npublic void executeAfterListenerRemoval() {\r\n  Registration registration\r\n    = serviceRegistration.register( ServiceListener.class, listener );\r\n  registration.unregister();\r\n\r\n  service.execute();\r\n\r\n  verify( listener, never() ).executed();\r\n}<\/pre>\n
Line five (registration.unregister()<\/code>) removes the listener spy from the service registry. This triggers an unbind and the listener gets never invoked. Of course a real world scenario could add additional tests for multiple listener registrations, exception handling and the like, but I think the concept has been made clear.<\/p>\n
Conclusion<\/h2>\n
So far the ServiceRegistrationRule<\/code> proves itself quite useful in our current project. It reduces boilerplate significantly and makes the tests cleaner and increases readability. The class is part of the com.codeaffine.osgi.test.util<\/em> feature of the Xiliary P2 repository: http:\/\/fappel.github.io\/xiliary<\/a><\/p>\n
In case you want to have a look at the code or file an issue you might also have a look at the Xiliary GitHub project: https:\/\/github.com\/fappel\/xiliary<\/a><\/p>\n
For everything else feel free to use the commenting section below. In a followup I will explain how to setup a maven-tycho<\/a> build with integrated PDE-Tests as those described above. This is somewhat tricky as tycho does not allow to access the bundles built by the current reactor, so stay tuned..<\/p>\n
\n\n\n\n
Reference: <\/span><\/td>\nOSGi Service Test Helper: ServiceRegistrationRule<\/a> from our JCG partner<\/a> Rudiger Herrmann at the Code Affine<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
OSGi Service Tests can be an efficient means to avoid problems related to dangling service references. As promised in my post about writing simple service contribution verifications, this time I introduce a JUnit rule that assists in testing interactions between components. OSGi Service Tests for Component Interaction Assume we have a service that notifies related …<\/p>\n","protected":false},"author":321,"featured_media":211,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[190],"class_list":["post-37011","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-osgi"],"yoast_head":"\nOSGi Service Test Helper: ServiceRegistrationRule - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"OSGi Service Tests can be an efficient means to avoid problems related to dangling service references. 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