How to use

UpdateListenerHub

in

org.apache.tapestry5.services

public static ComponentMessagesSource buildComponentMessagesSource(UpdateListenerHub updateListenerHub, @Autobuild
ComponentMessagesSourceImpl service)
{
  updateListenerHub.addUpdateListener(service);
  return service;
}

  public void run()
  {
    // On a race condition, multiple threads may hit this method briefly. If we've
    // already done a check, don't run it again.
    if (System.currentTimeMillis() - lastCheck >= checkInterval)
    {
      // Fire the update event which will force a number of checks and then
      // corresponding invalidation events.
      updateListenerHub.fireCheckForUpdates();
      lastCheck = System.currentTimeMillis();
    }
  }
};

@PostInjection
public void registerAsUpdateListener(UpdateListenerHub hub)
{
  hub.addUpdateListener(this);
}

/**
 * This allows tests the exists() method.
 */
@Test
public void component_class_reload() throws Exception
{
  // Ensure it doesn't already exist:
  assertFalse(source.exists(SYNTH_COMPONENT_CLASSNAME));
  // Create the class on the fly.
  createSynthComponentClass("Original");
  assertTrue(source.exists(SYNTH_COMPONENT_CLASSNAME));
  getMocksControl().resetToNice();
  Named named = (Named) createComponent(SYNTH_COMPONENT_CLASSNAME);
  assertEquals(named.getName(), "Original");
  long dtm = helper.readDTM(SYNTH_COMPONENT_CLASSNAME);
  while (true)
  {
    createSynthComponentClass("Updated");
    if (helper.readDTM(SYNTH_COMPONENT_CLASSNAME) != dtm)
      break;
    // Keep re-writing the file until we see the DTM change.
  }
  // Detect the change and clear out the internal caches
  UpdateListenerHub hub = registry.getService("UpdateListenerHub", UpdateListenerHub.class);
  hub.fireCheckForUpdates();
  // This will be the new version of the class
  named = (Named) createComponent(SYNTH_COMPONENT_CLASSNAME);
  assertEquals(named.getName(), "Updated");
}

@PostInjection
public void registerAsUpdateListener(UpdateListenerHub hub)
{
  hub.addUpdateListener(this);
}

@PostInjection
public void registerWithUpdateListenerHub(UpdateListenerHub hub)
{
  hub.addUpdateListener(this);
}

private <T> T createReloadingProxy(Class<T> interfaceClass, final Class<? extends T> implementationClass,
                  ObjectLocator locator)
{
  ReloadableObjectCreator creator = new ReloadableObjectCreator(proxyFactory, implementationClass.getClassLoader(),
      implementationClass.getName(), loggerSource.getLogger(implementationClass), this, locator);
  getService(UpdateListenerHub.class).addUpdateListener(creator);
  return proxyFactory.createProxy(interfaceClass, implementationClass, (ObjectCreator<T>) creator,
      String.format("<Autoreload proxy %s(%s)>", implementationClass.getName(), interfaceClass.getName()));
}

private <T> T createReloadingProxy(Class<T> interfaceClass, final Class<? extends T> implementationClass,
                  ObjectLocator locator)
{
  ReloadableObjectCreator creator = new ReloadableObjectCreator(proxyFactory, implementationClass.getClassLoader(),
      implementationClass.getName(), loggerSource.getLogger(implementationClass), this, locator);
  getService(UpdateListenerHub.class).addUpdateListener(creator);
  return proxyFactory.createProxy(interfaceClass, implementationClass, (ObjectCreator<T>) creator,
      String.format("<Autoreload proxy %s(%s)>", implementationClass.getName(), interfaceClass.getName()));
}

@PostInjection
public void listenForUpdates(UpdateListenerHub hub)
{
  invalidationHub.addInvalidationCallback(this);
  hub.addUpdateListener(this);
}

  private Object createReloadableProxy(ServiceBuilderResources resources)
  {
    ReloadableServiceImplementationObjectCreator reloadableCreator = new ReloadableServiceImplementationObjectCreator(proxyFactory,
        resources, proxyFactory.getClassLoader(), serviceImplementationClass.getName());

    resources.getService(UpdateListenerHub.class).addUpdateListener(reloadableCreator);

    if (eagerLoad)
    {
      reloadableCreator.createObject();
    }

    return proxyFactory.createProxy(serviceInterfaceClass, resources.getServiceImplementation(), reloadableCreator, getDescription());
  }
}

  private Object createReloadableProxy(ServiceBuilderResources resources)
  {
    ReloadableServiceImplementationObjectCreator reloadableCreator = new ReloadableServiceImplementationObjectCreator(proxyFactory,
        resources, proxyFactory.getClassLoader(), serviceImplementationClass.getName());

    resources.getService(UpdateListenerHub.class).addUpdateListener(reloadableCreator);

    if (eagerLoad)
    {
      reloadableCreator.createObject();
    }

    return proxyFactory.createProxy(serviceInterfaceClass, resources.getServiceImplementation(), reloadableCreator, getDescription());
  }
}