//----< Process request to Restore DB >----------------------------------
private Message ProcessRestore(Message msg)
{
bool success = false;
string filename;
parser.decodeRestoreRequest(msg, out filename);
perfTimer.Start();
PersistEngine.augment <int, DBElem, string>(db, filename);
if (db.Keys().Count() > 0)
{
success = true;
}
else
{
success = false;
}
perfTimer.Stop();
reqCount++;
totalTime += perfTimer.ElapsedMicroseconds;
Message result = maker.makeRestoreResult(msg, success);
return(result);
}
//----< Process request to Persist DB>-----------------------------------
private Message ProcessPersist(Message msg)
{
bool success = false;
string filename;
parser.decodePersistRequest(msg, out filename);
perfTimer.Start();
PersistEngine.persist <int, DBElem, string>(db, filename);
if (File.Exists(filename))
{
success = true;
}
else
{
success = false;
}
perfTimer.Stop();
reqCount++;
totalTime += perfTimer.ElapsedMicroseconds;
Message result = maker.makePersistResult(msg, success);
return(result);
}
//-------------< call the appropriate package from NoSQLdb based on request type >-----------
public bool call(string request)
{
switch (request)
{
case "add":
if (db.insert(key, elem))
{
return(true); //this will fail if multiple write clients write the same key to the db
}
break;
case "edit":
if (db.remove(key, out editElement)) //if no element present, editing cannot happen
{
editElement.name = elem.name;
editElement.descr = elem.descr;
editElement.timeStamp = DateTime.Now;
editElement.children.Clear();
editElement.children = elem.children;
editElement.payload = elem.payload;
if (db.insert(key, editElement))
{
return(true);
}
}
break;
case "delete":
if (db.remove(key, out elem))
{
return(true);
}
break;
case "persist":
PersistEngine pe = new PersistEngine();
pe.XMLWriteLOS(db, out pathname); // this will always return true, since it will always write out
return(true); // something, even if it's blank, to a file
case "restore":
pe = new PersistEngine();
if (pe.XMLRestoreLOS(elem.name, db))
{
return(true);
}
break;
default: return(false);
}
return(false);
}
//----< Process request to Display DB >----------------------------------
private Message ProcessDBDisplay(Message msg)
{
Console.WriteLine("Received Request to Retrieve DB");
perfTimer.Start();
XDocument xDocument = PersistEngine.ToXML <int, DBElem, string>(db);
perfTimer.Stop();
reqCount++;
totalTime += perfTimer.ElapsedMicroseconds;
Message result = maker.makeDisplayResult(msg, xDocument.ToString());
return(result);
}
static void Main(string[] args)
{
"Testing PersistEngine Package".title('=');
WriteLine();
DBEngine<int, DBElement<int, string>> db = new DBEngine<int, DBElement<int, string>>();
"\nSave to an XML file".title();
PersistEngineTest p1 = new PersistEngineTest();
p1.insertData(db);
dynamic allKeys = db.Keys();
PersistEngine<int,DBElement<int,string>> pEngine = new PersistEngine<int, DBElement<int, string>>(db);
pEngine.persistToXML(allKeys);
WriteLine("\n\nAbove database is stored as XML file in local machine");
WriteLine();
WriteLine("\nThe persisted XML file along with new key/value pairs are augmented to the database.\n");
WriteLine("Below shown key/value pairs are augmented to the database.\n");
pEngine.augmentDatabaseFromXML(db); //Augment the persisted database along with new values to the main database
pEngine.persistToXML(allKeys);
db.showDB();
WriteLine();
WriteLine();
"\nPersist database every 5 seconds until its cancelled".title();
WriteLine();
pEngine.scheduledSaveDatabase();
WriteLine();
WriteLine();
"\nProject dependancy and realtionships".title();
WriteLine();
DBEngine<string, DBElement<string, List<string>>> dependancyDb = new DBEngine<string, DBElement<string, List<string>>>();
PersistEngine<string, DBElement<string, List<string>>> pEngineString = new PersistEngine<string, DBElement<string, List<string>>>(dependancyDb);
try
{
Console.WriteLine("\nBelow details provide information on dependancy of every package in the project\n");
pEngine.displayDependancy();
dependancyDb.showEnumerableDB();
WriteLine();
}
catch (Exception e)
{
WriteLine("\n" + e.Message + "\n");
}
}
public void performOperations(DBEngine<string, DBElement<string, List<string>>> testDict, DBElement<string, List<string>> value)
{ /*----------Perform operations as per the input given in the XML document--------------*/
if (value.operation == "addition")
{
testDict.insert(value.key, value); //insert the key/value pairs to the main database
string s = "Database after inserting key " + value.key + " is";
printDatabase(testDict, s);
}
if (value.operation == "edit")
{
testDict.saveValue(value.key, value); //edit the value for the given key
string s = "Database after editing key " + value.key + " is";
printDatabase(testDict, s);
}
if (value.operation == "delete")
{
testDict.delete(value.key); //delete the key/value pair
string s = "Database after deleting key " + value.key + " is";
printDatabase(testDict, s);
}
if (value.operation == "persist database")
{
PersistEngine<string, DBElement<string, List<string>>> persist = new PersistEngine<string, DBElement<string, List<string>>>(testDict);
var keys = testDict.Keys();
persist.persistToXMLListPayload(keys);
printDatabase(testDict, "Persisted database is:");
}
if (value.operation == "Query value")
{
DBElement<string, List<string>> valueOfKey = testDict.getValueOfKey(value.key);
printQuery("Querying the database for value of key " + value.key + " is");
Console.WriteLine("\n\nThe value of the Key {0} is:\n", value.key);
valueOfKey.showEnumerableElement();
}
if (value.operation == "Query children")
{
QueryEngine<string, DBElement<string, List<string>>> qEngine = new QueryEngine<string, DBElement<string, List<string>>>(testDict);
printQuery("Querying the database for value of key " + value.key + " is");
List<string> children = qEngine.getChildrenOfKey(value.key);
Console.WriteLine("\nThe children of the Key {0} are:\n", value.key);
displayChildren(children);
}
if (value.operation == "Augment database")
{
PersistEngine<string, DBElement<string, List<string>>> persist = new PersistEngine<string, DBElement<string, List<string>>>(testDict);
string fileName = "C:\\Users\\rakeshh91\\Documents\\Rakesh Documents\\Class Materials\\SMA\\Assignments\\Assignment 4 - Implementation\\CommPrototype\\augmentDatabase.xml";
persist.augmentDatabaseFromXMLStringList(testDict, fileName);
printDatabase(testDict, "Database after augmenting is:");
}
}
//----< Import DB<Key, Value> from file >--------------------------------
public void SetupDB()
{
db = new DB();
PersistEngine.augment <int, DBElem, string>(db, "persistFile.xml");
}
