Examples of org.impalaframework.module.ModuleLoader

org.impalaframework.module.ModuleLoader
ModuleLoader is used to encapsulate differences in the load strategies required for different types of modules, in the same way as ifferent types of modules need to have their metadata read differently by different {@link TypeReader} implementations. Differences in the module loadstrategy cover a number of aspects.
- provision of a class loader for the module.
- what kind of Spring {@link ApplicationContext} is constructed. For example, webmodule types need to be backed by instances of {@link org.springframework.web.context.WebApplicationContext}
- what {@link BeanDefinitionReader} is used to extract the bean information.
ModuleLoader encapsulates differences that exist between module types in these respects.
However, module types backed by a ModuleLoader will observe some restrictions on how they are constructed and initialized, with the benefit of reducing the responsibilities of module loader implementations. However, if these restrictions are inappropriate or cannot be observed, it is possible to allow a module to be backed by a {@link DelegatingContextLoader} @see DelegatingContextLoader @author Phil Zoio

    return getModuleLoader(type, true);
  }


  public ModuleLoader getModuleLoader(String type, boolean failIfNotFound) {
    Assert.notNull(type, "type cannot be null");
    ModuleLoader moduleLoader = moduleLoaders.get(type.toLowerCase());


    if (failIfNotFound) {
      if (moduleLoader == null) {
        throw new NoServiceException("No " + ModuleLoader.class.getName()
            + " instance available for module definition type " + type);

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  public ConfigurableApplicationContext loadContext(ModuleDefinition definition, ApplicationContext parent) {


    Assert.notNull(moduleLoaderRegistry, ModuleLoaderRegistry.class.getName() + " cannot be null");
    ConfigurableApplicationContext context = null;
    
    final ModuleLoader moduleLoader = moduleLoaderRegistry.getModuleLoader(definition.getType(), false);
    final DelegatingContextLoader delegatingLoader = moduleLoaderRegistry.getDelegatingLoader(definition.getType());


    try {


      if (moduleLoader != null) {
        if (logger.isDebugEnabled()) logger.debug("Loading module " + definition + " using ModuleLoader " + moduleLoader);
        context = loadApplicationContext(moduleLoader, parent, definition);
        moduleLoader.afterRefresh(context, definition);
      }
      else if (delegatingLoader != null) {
        if (logger.isDebugEnabled()) logger.debug("Loading module " + definition + " using DelegatingContextLoader " + moduleLoader);
        context = delegatingLoader.loadApplicationContext(parent, definition);
      }

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  }


  public boolean process(ModuleStateHolder moduleStateHolder, RootModuleDefinition newRootDefinition,
      ModuleDefinition moduleDefinition) {


    ModuleLoader moduleLoader = moduleLoaderRegistry.getModuleLoader(newRootDefinition.getType());
    ConfigurableApplicationContext parentContext = moduleStateHolder.getRootModuleContext();


    ClassLoader classLoader = parentContext.getClassLoader();


    RootModuleDefinition existingModuleDefinition = moduleStateHolder.getRootModuleDefinition();
    Resource[] existingResources = moduleLoader.getSpringConfigResources(existingModuleDefinition, classLoader);
    Resource[] newResources = moduleLoader.getSpringConfigResources(newRootDefinition, classLoader);


    // compare difference
    List<Resource> existingResourceList = newResourceList(existingResources);
    List<Resource> newResourceList = newResourceList(newResources);
    List<Resource> toAddList = new ArrayList<Resource>();


    for (Resource resource : newResourceList) {
      if (!existingResourceList.contains(resource)) {
        toAddList.add(resource);
      }
    }


    BeanDefinitionReader beanDefinitionReader = moduleLoader.newBeanDefinitionReader(parentContext,
        newRootDefinition);
    beanDefinitionReader.loadBeanDefinitions(toAddList.toArray(new Resource[toAddList.size()]));


    return true;
  }

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  void findAndStartBundle(ModuleDefinition currentDefinition) {
    Assert.notNull(currentDefinition, "moduleDefinition cannot be null");
        
    //install if not present
    final ModuleLoader moduleLoader = moduleLoaderRegistry.getModuleLoader(currentDefinition.getType());
    final Resource[] bundleLocations = moduleLoader.getClassLocations(currentDefinition);    


    //find bundle with name
    Bundle bundle = findBundle(currentDefinition);


    if (bundleLocations == null || bundleLocations.length == 0) {
      throw new InvalidStateException("Module loader '" + moduleLoader.getClass().getName() 
          + "' returned " + (bundleLocations != null ? "empty": "null") + 
          " bundle class locations. Cannot install bundle for module '" 
          + currentDefinition.getName() + "'");
    }

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Related Classes of org.impalaframework.module.ModuleLoader

org.impalaframework.module.loader.BaseApplicationContextLoader

org.impalaframework.module.loader.ModuleLoaderRegistry

org.impalaframework.module.transition.AddLocationsTransitionProcessor

org.impalaframework.osgi.module.transition.OsgiLoadTransitionProcessor

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