serialize.obj

this is a sequencing state file initialized with tree information from the imsmanifest.xml file. It is a serialized org.adl.sequencer.SeqActivityTree object. One of each of these initialized object files is persisted in SampleRTE131Files/(userid)/(courseid) directory, always with the same name (serialize.obj)

• references:
  • org.adl.samplerte.server.LMSCMIServlet (2)
  • org.adl.samplerte.server.LMSManifestHandler
  • /runtime/sequencingUtil.jsp (persistActivityTree())
  • /runtime/processCourseReg.jsp (2) (initialization)
  • /runtime/sequencingEngine.jsp
  • /runtime/code.jsp (UI: displays TOC)

• using hibernate to persist
  • the properties in SeqActivityTree are as follows:

         private SeqActivity mRoot = null;
    

    mRoot: mapped to column ROOT (and is a foreign key)
  • this would have to be persisted in some form so we have to have another table for SeqActivity classes

       /**
        * The set of valid navigation requests for the current state of the activity
        * tree.
        *
        */
           private ADLValidRequests mValidReq = null;
    

    mValidReq: may be possible to determine this at runtime, or at first instatiation for use

    
       /**
        * This is the identifier for the last leaf in the activity tree
        *@hibernate.property
        */
           private String mLastLeaf = null; 
    

    mLastLeaf: mapped to column LASTLEAF

       /**
        * This is the scope of this activity tree's objectives
        *@hibernate.property
        */
           private String mScopeID = null;
    

    mScopeID: mapped to column SCOPE

       /**
        * This is the course (really a content package) identifier for the current activity tree
        *@hibernate.property
        */
           private String mCourseID = null; 
    

    mCourseID: mapped to column PACKAGEID

       /**
        * This is the student identifier for the student utilizing this activity
        * tree
        *@hibernate.property
        */
           private String mLearnerID = null;
    

    mLearnerID: mapped to column LEARNERID

    
       // Internal state of the activity tree
       /**
        * This is the current activity<br><br>
        * Defined in IMS SS AM
        * WRT hibernate: does not have to be a persisted value...
        *    ... this reflects the 'current' progress infomation
        *    ... exitAll requests assume subsequent requests start from ROOT
        *  
        */
           private SeqActivity mCurActivity = null;
    

    mCurActivity: not mapped (see code comments)

       /**
       * This is the first candidate activity to for sequencing requests.
       *@hibernate.property
       */
          private SeqActivity mFirstCandidate = null;
    

    mFirstCandidate: not mapped, use mSeqTree.setFirstCandidate(mSeqTree.getRoot()) after instantiation

NOTE: this page is currently under construction

   /**
    * This is last activity experienced by the student prior to a SuspendAll
    * sequencing request.<br><br>
    * Defined in IMS SS AM
    *@hibernate.property
    */
       private SeqActivity mSuspendAll = null;

   /**
    * This is an internal 'quick' reference map of the activity tree's nodes
    * WRT hibernate perisistence: use buildActivityMap() after retrieval
    */
       private Hashtable mActivityMap = null;

   /**
    * This is the set of global objective IDs used in this activity tree.
    *@hibernate.property
    */
       private Vector mObjSet = null;

   /**
    * This is a map of activities that read from each of the global shared
    * objectives.
    *@hibernate.property
    */
       private Hashtable mObjMap = null;

   /**
    * This indicates if the global objective IDs have been determined for this 
    * tree.
    *@hibernate.property
    */
       private boolean mObjScan = false;