PicoContainer support

[Joey Robonaut]

I see the project serenity-picocontainer but it's empty.  Are there plans to incorporate support for PicoContainer?  I really like their Storing behavior for managing multithreaded dependencies, which is useful when running on Selenium Grid.

[John Smart]

Not easily, or at least not with the standard Cucumber module - Cucumber only allows one dependency injection framework, and Serenity is effectively a dependency injection framework. I toyed with the idea of integrating PicoContainer as an optional module (hence the module) but I don't use it myself so didn't know the best way to go about it. If you tell me more about they way you would like to use it, I could see what I could do.

On 3 February 2015 at 15:11, Joey Robonaut <jpn...@gmail.com> wrote:

I see the project serenity-picocontainer but it's empty.  Are there plans to incorporate support for PicoContainer?  I really like their Storing behavior for managing multithreaded dependencies, which is useful when running on Selenium Grid.

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[Joey Robonaut]

Hi John,

Below are my objectives.  I have implemented such a framework based on jBehave, but I would like to abandon it and move to Cucumber/Serenity BDD.

- run multiple .feature files concurrently and generate a single report

- each thread is given its own test session; no sharing of page objects or step def instances between threads, and instances are destroyed when thread/.feature is ended

- ability to inject container-managed dependencies into page object or step defs, some dependencies being "singleton" (shared between threads) others being "threadlocal".  This is where PicoContainer is helpful.  For example (jBehave):

/* subclass of JUnitStories */

@Override
public List<CandidateSteps> candidateSteps() {
    return new PicoStepsFactory(configuration(), getPicoContainer())
            .createCandidateSteps();
}

private PicoContainer getPicoContainer() {
    // root container
    MutablePicoContainer top = new PicoBuilder()
            .withBehaviors(new Caching())   // Singleton behavior
            .withConstructorInjection()
            .build();
    top.addComponent(ContentDAO.class);
    top.addComponent(UserDAO.class);
   
    // child container
    final ClassLoadingPicoContainer child = new ClassLoadingPicoContainer(
            top.getClass().getClassLoader(),
            new ThreadCaching(),            // Thread-Local behavior
            top);
    child.addComponent(WebElementRepository.class);
   
    // scan the classpath for step def classes
    child.visit(rootName, ".*\\.class", true, new ClassLoadingPicoContainer.ClassVisitor() {
        @Override
        public void classFound(@SuppressWarnings("rawtypes") Class clazz) {
            // concrete classes only
            int mods = clazz.getModifiers();
            if (Modifier.isAbstract(mods) || Modifier.isInterface(mods)) {
                return;
            }
           
            // search type hierarchy to see if its a step
            for (Class<?> cur = clazz; cur != null && cur != Object.class; cur = cur.getSuperclass()) {
                if (cur == AbstractSteps.class) {
                    child.addComponent(clazz);
                    break;
                }
            }
        }
    });
    return child;
}

/* example stepdef */
public class MySteps extends AbstractSteps {

    private ContentDao contentDao; // singleton
    private UserDao userDao; // singleton
    private WebElementRepository repo; // threadlocal
 
    public MySteps(ContentDAO contentDao, UserDAO userDao, WebElementRepository repo) {
        this.contentDao = contentDao;
        this.userDao = userDao;
        this.repo = repo;
    }

    // ...
}

 

I see Serenity uses a simple declaration only approach with Guice under the hood.  I would be content if this were possible given the current toolsets.

PS - could you enable post editing in this group?