new thought about saveState

[Zhong Li]

Hi All,

I am trying to find a way to avoid saveState tag on client side, finally I got an idea, please give me comments regardless my thought wrong or right. Actually it is way to save server side data/model. We define DataSaveManager to manage save/remove a data in a session. When code saves data into session, sametime need set possible pages the data will be used, or create a data path rules. In phaseListener after RENDER_RESPONSE(6), we check the data in session, if current viewRoot isn't in possible pages list or data path rules list, the data will be removed automatically. Of couse, code can remove any data anytime. If the way works, we may find a way to do it in config file. We can add possiblePageList in ManageBean defination section and pageRuleList in Navigation Rules section.

Codes looks like

/**
 * @author zli
 *
*/
public class MposPhaseListener implements PhaseListener {

    /* (non-Javadoc)
     * @see javax.faces.event.PhaseListener#afterPhase(javax.faces.event.PhaseEvent)
     */
    public void afterPhase(PhaseEvent arg0) {
        //System.out.println("afterPhase:"+arg0.getPhaseId());
        String viewId = arg0.getFacesContext().getViewRoot().getViewId();
        Map sessionData = DataSaveManager.getSessionDataMap();
        Set removeIds = new HashSet();
        if( sessionData!=null ){
            Iterator itr = sessionData.keySet().iterator();
            while( itr.hasNext() ){
                String dataId = (String)itr.next();
                SaveData saveData = (SaveData)sessionData.get(dataId);
                LinkedList possiblePageList = saveData.getPossiblePageList();
                //we check if the viewId in possible page
                if(possiblePageList!=null && possiblePageList.contains(viewId) ){
                    //we need keep it;
                    continue;
                }
               
                LinkedList pageRuleList =  saveData.getPageRuleList();
                if( pageRuleList!=null ){
                    //we check and consume rules
                    for( int pi = 0;pi<pageRuleList.size();pi++ ){
                        //try one rule
                        LinkedList rulePath = (LinkedList)pageRuleList.get(pi);
                        if( rulePath.contains(viewId) ){
                            if( viewId.equals(rulePath.get(0)) ){//cosume it
                                rulePath.remove(0);//cosumed.
                                //we need keep it;
                                continue;
                            }
                        }
                    }
                }
                //this data is useless, put in removeIds
                removeIds.add(dataId);
            }
            //remove data
            itr = removeIds.iterator();
            while(itr.hasNext()){
                String dataId = (String)itr.next();
                sessionData.remove(dataId);
            }
           
        }

    }

    /* (non-Javadoc)
     * @see javax.faces.event.PhaseListener#beforePhase(javax.faces.event.PhaseEvent)
     */
    public void beforePhase(PhaseEvent arg0) {
        //System.out.println("beforePhase:"+arg0.getPhaseId());
    }

    /* (non-Javadoc)
     * @see javax.faces.event.PhaseListener#getPhaseId()
     */
    public PhaseId getPhaseId() {
        return PhaseId.RENDER_RESPONSE;
        //return PhaseId.ANY_PHASE;
    }
 
}


public class DataSaveManager{
    public final static String sessionID="_DATA_SAVE_SESSION_ENTRY";
    public static Map getSessionDataMap(){
        FacesContext context = FacesContext.getCurrentInstance();
        ExternalContext ext = context.getExternalContext();
        return (Map)ext.getSessionMap().get(sessionID);
    }
  
    /**
     *
     * @param data
     * @param possiblePageList  is LinkedList
     * @param pageRuleList is LinkedList wrap of LinkedList 
     */
    public static void saveData(String dataId, Object data, LinkedList possiblePageList, LinkedList pageRuleList){
        getSessionDataMap().put(dataId,new SaveData(dataId,data, possiblePageList, pageRuleList));
    }
    public static void removeData(String dataId){
        getSessionDataMap().remove(dataId);
    }
    public static SaveData getSaveData(String dataId){
        return (SaveData)getSessionDataMap().get(dataId);
    }
   
}


public class SaveData{
    String dataId;
    Object data;
    LinkedList possiblePageList;
    LinkedList pageRuleList;
    public SaveData(String dataId, Object data, LinkedList possiblePageList, LinkedList pageRuleList){
        this.dataId = dataId;
        this.data = "">         this.possiblePageList = possiblePageList;
        this.pageRuleList = pageRuleList;
    }
    public Object getData(){
        return data;
    }
    public LinkedList getPossiblePageList(){
        return possiblePageList;
    }
    public LinkedList getPageRuleList(){
        return pageRuleList;
    }
    public String getDataId(){
        return dataId;
    }
}



If this is possible, so we can make it in JSF1.2, it will solve lots problems.


--
Zhong Li

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