Examples of org.impalaframework.module.ModuleDefinition

org.impalaframework.module.ModuleDefinition
{@link ModuleDefinition} exposes a number of methods which return informationon a module, such as name, type and the identity of parent and child modules. ModuleDefinition has a similar role in Impala to the role of {@link org.springframework.beans.factory.config.BeanDefinition}s in Spring. A hierarchy of {@link ModuleDefinition}s can be considered an abstract representation of the module hierarchy, which can be manipulated separately from the runtime module hierarchy (which is essentially a hierarchy of Spring application contexts). At the root of the a hierarchy of module definitions is an instance of {@link RootModuleDefinition}, which exposes another couple of methods specific to root modules. @see RootModuleDefinition @author Phil Zoio

public class DefaultModuleStateChangeNotifier implements ModuleStateChangeNotifier {


  private List<ModuleStateChangeListener> listeners = new LinkedList<ModuleStateChangeListener>();


  public void notify(ModuleStateHolder moduleStateHolder, ModuleStateChange change) {
    ModuleDefinition moduleDefinition = change.getModuleDefinition();


    for (ModuleStateChangeListener moduleStateChangeListener : listeners) {
      String moduleName = moduleStateChangeListener.getModuleName();


      boolean notify = true;


      if (moduleName != null) {
        if (!moduleName.equals(moduleDefinition.getName())) {
          notify = false;
        }
      }


      if (notify) {

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   * implementation. If no parent definition is available, the built {@link ModuleDefinition} instance
   * is added as a sibling to the {@link RootModuleDefinition}.
   */
  public RootModuleDefinition getModuleDefinition() {
    
    ModuleDefinition currentParentDefinition = parentDefinition;
    for (String moduleName : modulesToLoad) {
      ModuleDefinition definition = buildModuleDefinition(currentParentDefinition, moduleName);
      
      if (currentParentDefinition == null) {
        Assert.isTrue(!definition.getName().equals(rootModuleDefinition.getName()), "Module definition with no parent cannot be the root module definition");
        rootModuleDefinition.addSibling(definition);
      }
      
      currentParentDefinition = definition;
    }

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    if (oldRootDefinition == null) {
      return false;
    }
    
    RootModuleDefinition newRootDefinition = moduleStateHolder.cloneRootModuleDefinition();
    ModuleDefinition definitionToRemove = newRootDefinition.findChildDefinition(moduleToRemove, true);


    if (definitionToRemove != null) {
      if (definitionToRemove instanceof RootModuleDefinition) {
        //we're removing the rootModuleDefinition
        TransitionSet transitions = calculator.getTransitions(oldRootDefinition, null);
        moduleStateHolder.processTransitions(transitions);
        return true;
      }
      else {
        ModuleDefinition parent = definitionToRemove.getParentDefinition();
        if (parent != null) {
          parent.removeChildModuleDefinition(moduleToRemove);
          
          definitionToRemove.setParentDefinition(null);


          TransitionSet transitions = calculator.getTransitions(oldRootDefinition, newRootDefinition);
          moduleStateHolder.processTransitions(transitions);

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      Collection<? extends ModuleStateChange> changes = transitions.getModuleTransitions();


      for (ModuleStateChange change : changes) {
        String transition = change.getTransition();
        ModuleDefinition currentModuleDefinition = change.getModuleDefinition();


        TransitionProcessor transitionProcessor = transitionProcessorRegistry.getTransitionProcessor(transition);
        transitionProcessor.process(transitions.getNewRootModuleDefinition(), currentModuleDefinition);
      
        if (moduleStateChangeNotifier != null) {

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            Collection<ModuleDefinition> oldChildren, 
            Collection<ModuleDefinition> newChildren, 
            List<ModuleStateChange> transitions) {
        
        for (ModuleDefinition newChild : newChildren) {
            ModuleDefinition oldChild = ModuleDefinitionUtils.getModuleFromCollection(oldChildren, newChild.getName());


            //if new module has definition not present in old, then load this with children
            if (oldChild == null) {
                loadDefinitions(newChild, transitions);             
            }

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            Collection<ModuleDefinition> oldChildren, 
            Collection<ModuleDefinition> newChildren, 
            List<ModuleStateChange> transitions) {
    
        for (ModuleDefinition oldChild : oldChildren) {
            ModuleDefinition newChild = ModuleDefinitionUtils.getModuleFromCollection(newChildren, oldChild.getName());


            //if old module has definition which is no longer present, then unload this
            if (newChild == null) {
                unloadDefinitions(oldChild, transitions);
            }

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public class DefaultModuleStateChangeNotifier implements ModuleStateChangeNotifier {


    private List<ModuleStateChangeListener> listeners = new LinkedList<ModuleStateChangeListener>();


    public void notify(ModuleStateHolder moduleStateHolder, ModuleStateChange change) {
        ModuleDefinition moduleDefinition = change.getModuleDefinition();


        for (ModuleStateChangeListener moduleStateChangeListener : listeners) {
            String moduleName = moduleStateChangeListener.getModuleName();


            boolean notify = true;


            if (moduleName != null) {
                if (!moduleName.equals(moduleDefinition.getName())) {
                    notify = false;
                }
            }


            if (notify) {

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            Collection<ModuleDefinition> oldChildren, 
            Collection<ModuleDefinition> newChildren, 
            List<ModuleStateChange> transitions) {
    
        for (ModuleDefinition oldChild : oldChildren) {
            ModuleDefinition newChild = ModuleDefinitionUtils.getModuleFromCollection(newChildren, oldChild.getName());


            if (newChild == null) {
                newParent.addChildModuleDefinition(oldChild);
                oldChild.setParentDefinition(newParent);
            }

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  protected ModuleDefinition buildModuleDefinition(
      ModuleDefinition parentDefinition, String moduleName) {
    Properties properties = moduleProperties.get(moduleName);
    String type = getType(properties);
    TypeReader reader = typeReadeRegistry.getTypeReader(type);
    ModuleDefinition definition = reader.readModuleDefinition(parentDefinition, moduleName, properties);
    definition.setParentDefinition(parentDefinition);
    return definition;
  }

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    }


    protected ApplicationContext internalGetParentApplicationContext(
            ModuleDefinition definition) {
        ConfigurableApplicationContext parentContext = null;
        ModuleDefinition parentDefinition = definition.getParentDefinition();
        
        while (parentDefinition != null) {
            
            final String parentName = parentDefinition.getName();
            final RuntimeModule parentModule = getModuleStateHolder().getModule(parentName);
            if (parentModule instanceof SpringRuntimeModule) {
                SpringRuntimeModule springRuntimeModule = (SpringRuntimeModule) parentModule;
                parentContext = springRuntimeModule.getApplicationContext();
                break;
            }
            
            parentDefinition = parentDefinition.getParentDefinition();          
        }
        return parentContext;
    }

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