Recoverable applications - Software Development Case Studies in Java - page 487

Hashtable temp # (Hashtable) inputObject.readObject();
Iterator iterator # temp.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry entry # (Map.Entry) iterator.next();
Trackable target #
((Trackable)objectList.get(entry.getKey()));
target.restore((Trackable)entry.getValue());
}
inputObject.close();
inputFile.close();
// loads the saved sequence of entries
inputFile # new FileInputStream
("trackerPhysical.log");
inputObject # new ObjectInputStream(inputFile);
entryList.removeAll(entryList);
Entry entry # null ;
// builds the list of Entry objects
while ((entry # (Entry)inputObject.readObject()) ! # null )
entryList.add(entry);
inputObject.close();
inputFile.close();
}
catch (Exception e) {
System.out.println("*** end of file ***");
currentEntry # 0;
}
}
public static void redoUntil( int entryID) {
if (entryID ## currentEntry || entryID > entryList.size())
return ;
// in the case of undo operation, the application state
// is restored to the last saved stable state;
if (entryID < currentEntry)
restore()
// it redos all of the operations loaded from the log
// file up to the current entry
while (entryID > currentEntry){
Entry entry # (Entry) entryList.get(currentEntry);
Trackable target # (Trackable) objectList.get
(entry.getTargetRef());
target.restore(entry.getTarget());
currentEntry !! ;
}
}