PropertyChangeSupport 触发事件未到达

Question

首先，我有一个名为 rit (ride) 的模型类，它扩展了 AbstractModel。 我还有一个 AbstractController。

该模型应该触发抽象控制器应该处理的属性更改。该事件已正确触发，但控制器未捕获该事件。

我有以下代码：

public abstract class AbstractModel {

/**
 * Convenience class that allow others to observe changes to the model properties
 */
protected PropertyChangeSupport propertyChangeSupport;

/**
 * Default constructor. Instantiates the PropertyChangeSupport class.
 */
public AbstractModel() {
    propertyChangeSupport = new PropertyChangeSupport(this);
}

/**
 * Adds a property change listener to the observer list.
 * @param l The property change listener
 */
public void addPropertyChangeListener(PropertyChangeListener l) {
    propertyChangeSupport.addPropertyChangeListener(l);
}
/**
 * Fires an event to all registered listeners informing them that a property in
 * this model has changed.
 * @param propertyName The name of the property
 * @param oldValue The previous value of the property before the change
 * @param newValue The new property value after the change
 */
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
    PropertyChangeListener[] listener = propertyChangeSupport.getPropertyChangeListeners();


    propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue);
}
}

.

public class RitAanvraagController extends AbstractController {

//  Properties this controller expects to be stored in one or more registered models

public static final String RITAANVRAAG_WACHTRIJ_PROPERTY = "Ritaanvraag";

/**
 * Voeg een ritaanvraag toe aan het model
 * @param ritAanvraag de nieuwe rit aanvraag.
 */
public void nieuwRitaanvraag(RitAanvraagModel ritAanvraag) {
    alterModelProperty("add", RITAANVRAAG_WACHTRIJ_PROPERTY, ritAanvraag);
}
}

。

package com.itopia.railcabserver.controller;

public abstract class AbstractController implements PropertyChangeListener {

//  Vectors that hold a list of the registered models and views for this controller.
private ArrayList<AbstractViewPanel> registeredViews;
private ArrayList<AbstractModel> registeredModels;

/** Creates a new instance of Controller */
public AbstractController() {
    registeredViews = new ArrayList<AbstractViewPanel>();
    registeredModels = new ArrayList<AbstractModel>();
}

/**
 * Binds a model to this controller. Once added, the controller will listen for all 
 * model property changes and propogate them on to registered views. In addition,
 * it is also responsible for resetting the model properties when a view changes
 * state.
 * @param model The model to be added
 */
public void addModel(AbstractModel model) {
    registeredModels.add(model);
    model.addPropertyChangeListener(this);
}


public void propertyChange(PropertyChangeEvent evt) {

    for (AbstractViewPanel view : registeredViews) {
        view.modelPropertyChange(evt);
    }
}
}

propertyChange 方法永远不会在抽象控制器中，也永远不会被触发。

但是当我触发这个：propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue);在抽象模型中，属性更改永远不会在抽象控制器中被触发。不是当我将某些内容打印到控制台时，也不是当我设置断点时。 当我调试并在方法 propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue); 处设置断点时 PropertyChangeListener[] 侦听器确实包含 ritAanvraagController。所以它应该被激发给它，然后由抽象控制器处理。

我希望有人看到我的错误并可以帮助我。

亲切的问候， 里克特