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

     */
    private void populateVertexDependencies(Vertex vertex) {
        
        Assert.notNull(vertex, "vertex cannot be null");
        
        final ModuleDefinition moduleDefinition = vertex.getModuleDefinition();
        
        final List<String> dependentModuleNames = moduleDefinition.getDependentModuleNames();
        for (String dependent : dependentModuleNames) {
            
            final Vertex dependentVertex = vertexMap.get(dependent);
            
            if (dependentVertex == null) {
                throw new InvalidStateException("Unable to dependency named named '" + dependent 
                        + "' for module definition '" + moduleDefinition.getName() + "'");
                
            } else {
                //register the vertex dependency
                populateVertexDependency(vertex, dependentVertex);
            }

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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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        logger.info("With parent '" + parent + "', adding module: " + moduleDefinition);
        
        final Vertex parentVertex = getRequiredVertex(parent);
        
        ModuleDefinition parentDefinition = parentVertex.getModuleDefinition();
        parentDefinition.addChildModuleDefinition(moduleDefinition);
        moduleDefinition.setParentDefinition(parentDefinition);
        
        //now recursively add definitions
        List<Vertex> addedVertices = new ArrayList<Vertex>();
        populateDefinition(addedVertices, moduleDefinition);

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     */
    private void populateVertexDependencies(Vertex vertex) {
        
        Assert.notNull(vertex, "vertex cannot be null");
        
        final ModuleDefinition moduleDefinition = vertex.getModuleDefinition();
        
        final List<String> dependentModuleNames = moduleDefinition.getDependentModuleNames();
        for (String dependent : dependentModuleNames) {
            
            final Vertex dependentVertex = vertexMap.get(dependent);
            
            if (dependentVertex == null) {
                throw new InvalidStateException("Unable to dependency named named '" + dependent 
                        + "' for module definition '" + moduleDefinition.getName() + "'");
                
            } else {
                //register the vertex dependency
                populateVertexDependency(vertex, dependentVertex);
            }

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    protected RuntimeModule doLoadModule(ModuleDefinition definition) {
        Assert.notNull(definition);
        Assert.notNull(classLoaderFactory);
        
        ClassLoader parentClassLoader = null;
        final ModuleDefinition parentDefinition = definition.getParentDefinition();


        if (parentDefinition != null) {
            parentClassLoader = getClassLoaderRegistry().getClassLoader(parentDefinition.getName());
        }
        final ClassLoader classLoader = classLoaderFactory.newClassLoader(parentClassLoader, definition);
        return new SimpleRuntimeModule(classLoader, definition);
    }

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    //recursively build child definitions
    buildChildDefinitions(rootModuleDefinition, rootModuleName);
    
    for (String sibling : siblings) {
      ModuleDefinition siblingDefinition = buildModuleDefinition(null, sibling);
      buildChildDefinitions(siblingDefinition, siblingDefinition.getName());
      rootModuleDefinition.addSibling(siblingDefinition);
    }
    return rootModuleDefinition;
  }

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  protected void buildChildDefinitions(ModuleDefinition parentDefinition, String parentModuleName) {
    Set<String> moduleChildren = children.get(parentModuleName);
    if (moduleChildren != null) {
      for (String moduleName : moduleChildren) {
        ModuleDefinition definition = buildModuleDefinition(parentDefinition, moduleName);
        buildChildDefinitions(definition, moduleName);
      }
    }
  }

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    }
  }
  
  private RootModuleDefinition readRootModuleDefinition(Properties rootModuleProperties,
      TypeReader typeReader) {
    ModuleDefinition moduleDefinition = typeReader.readModuleDefinition(null, rootModuleName, rootModuleProperties);
    if (!(moduleDefinition instanceof RootModuleDefinition)) {
      throw new IllegalStateException("Type reader " + typeReader + " produced " + ModuleDefinition.class.getSimpleName() + " which is not an instance of " + RootModuleDefinition.class.getName());
    }
    RootModuleDefinition rootDefinition = (RootModuleDefinition) moduleDefinition;
    return rootDefinition;

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  }


  public ModuleOperationResult doExecute(ModuleOperationInput moduleOperationInput) {
    
    Assert.notNull(moduleOperationInput, "moduleOperationInput cannot be null");
    ModuleDefinition moduleToAdd = moduleOperationInput.getModuleDefinition();
    Assert.notNull(moduleToAdd, "moduleName is required as it specifies the name of the module to add in " + this.getClass().getName());
    
    ModuleStateHolder moduleStateHolder = getModuleStateHolder();
    ModificationExtractor calculator = getModificationExtractorRegistry().getModificationExtractor(ModificationExtractorType.STICKY);

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      ModuleDefinition moduleDefinition) {


    RootModuleDefinition oldRootDefinition = moduleStateHolder.cloneRootModuleDefinition();
    RootModuleDefinition newRootDefinition = moduleStateHolder.cloneRootModuleDefinition();


    ModuleDefinition parent = moduleDefinition.getParentDefinition();
    
    if (moduleDefinition instanceof RootModuleDefinition) {
      newRootDefinition = (RootModuleDefinition) moduleDefinition;
    }
    else {


      ModuleDefinition newParent = null;


      if (parent == null) {
        newParent = newRootDefinition;
      }
      else {
        String parentName = parent.getName();
        newParent = newRootDefinition.findChildDefinition(parentName, true);


        if (newParent == null) {
          throw new InvalidStateException("Unable to find parent module '" + parentName + "' in " + newRootDefinition);
        }
      }


      newParent.addChildModuleDefinition(moduleDefinition);
      
      moduleDefinition.setParentDefinition(newParent);
    }


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

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