public Action<Message> insert(DBEngine<string, DBElement<string, List<string>>> db)
{
Action<Message> Insert =(msg)=>
{
XDocument xml = XDocument.Parse(msg.content);
XElement element = xml.Descendants("Msg").ElementAt(0).Descendants("Data").ElementAt(0);
string key = element.Descendants("key").ElementAt(0).Value;
DBElement<string, List<string>> elem = new DBElement<string, List<string>>();
elem.name = element.Descendants("value").Descendants("name").ElementAt(0).Value;
elem.descr= element.Descendants("value").Descendants("descr").ElementAt(0).Value;
elem.timeStamp = (DateTime)element.Descendants("value").Descendants("timestamp").ElementAt(0);
IEnumerable<XElement> children = element.Descendants("value").Descendants("children").Descendants("key");
foreach(var child in children)
elem.children.Add(child.Value);
IEnumerable<XElement> items = element.Descendants("value").Descendants("payload").Descendants("item");
elem.payload = new List<string>();
foreach (var item in items)
elem.payload.Add(item.Value);
if (!db.insert(key, elem))
msg.content = "Insert fail";
else
{
msg.content = "Insert success";
Console.Write("\n\n --- insert a DBElement<string,List<string>>---");
elem.showEnumerableElement();
}
Utilities.swapUrls(ref msg);
};
return Insert;
}
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:");
}
}
static void Main(string[] args)
{
DBEngine <string, DBElement <string, List <string> > > db = new DBEngine <string, DBElement <string, List <string> > >();
ItemFactory <int, string> itemFactory = new ItemFactory <int, string>();
"Demonstrating Requirement #2".title();
DBElement <string, List <string> > elem = new DBElement <string, List <string> >();
elem.name = "element";
elem.descr = "test element";
elem.timeStamp = DateTime.Now.AddDays(-4);
elem.children.AddRange(new List <string> {
"1", "2", "3 "
});
elem.payload = new List <string> {
"elem's payload"
};
WriteLine("\n Item to be inserted.. \n");
elem.showEnumerableElement();
db.insert("1", elem);
db.showEnumerableDB();
WriteLine();
WriteLine("\n Inserting second element into DB :");
DBElement <string, List <string> > elem2 = new DBElement <string, List <string> >();
elem2.name = "element2";
elem2.descr = "test element2";
elem2.timeStamp = DateTime.Now;
elem2.children.AddRange(new List <string> {
"1", "2", "3", "4"
});
elem2.payload = new List <string> {
"elem's payload"
};
WriteLine("\nItem to be inserted.. \n");
elem2.showElement();
db.insert("2", elem2);
WriteLine("\n\n DB after insertion:");
db.showEnumerableDB();
"Persisting the database to XML:".title('_');
db.toXml();
"Augumenting database from XML".title('_');
db.restoreDatabase();
db.showEnumerableDB();
}
static void Main(string[] args)
{
"Testing DBExtensions Package".title('=');
WriteLine();
DBElement <int, string> elem1 = new DBElement <int, string>("Element-7", "Description of Element-7");
elem1.payload = "Payload of element-7.";
elem1.children.AddRange(new List <int> {
8, 9
});
DBElement <int, string> elem2 = new DBElement <int, string>("Element-8", "Description of Element-8");
//elem2.payload = "Payload of element-8.";
DBElement <int, string> elem3 = new DBElement <int, string>("Element-9", "Description of Element-9");
elem3.payload = "Payload of element-3.";
DBEngine <int, DBElement <int, string> > db = new DBEngine <int, DBElement <int, string> >();
db.insert(7, elem1);
db.insert(8, elem2);
db.insert(9, elem3);
Write(" Created a new dataBase with following contents:");
db.showDB();
WriteLine("\n\n Now going to persist the database contents to an XML file.");
PersistEngine pe = new PersistEngine();
string file_name = pe.persistDB <int, DBElement <int, string>, string>(db);
WriteLine(" Database contents are saved as - {0}", file_name);
WriteLine("\n Going to remove all DB elements and load the xml file saved above.");
db.remove(7);
db.remove(8);
db.remove(9);
WriteLine(" DB contents before calling load-DB");
db.showDB();
WriteLine(" Now send command to load database from the XML file.");
pe.loadDB <int, DBElement <int, string>, string>(db, file_name);
Write(" DB contents after calling load-DB ");
db.showDB();
DBEngine <string, DBElement <string, List <string> > > db2 = new DBEngine <string, DBElement <string, List <string> > >();
Write("\n\n --- DBElement<string,List<string>> ---");
DBElement <string, List <string> > elem_str = new DBElement <string, List <string> >();
elem_str.name = "Element-One";
elem_str.descr = "DB Element whose key type is string and payload type is List of strings.";
elem_str.timeStamp = DateTime.Now;
elem_str.children = new List <string> {
"Two", "Three", "Four"
};
elem_str.payload = new List <string> {
"Element payload is of type List of strings.", "This is string two.", "And third"
};
elem_str.showEnumerableElement();
db2.insert("One", elem_str);
Write("\n\n --- DBEngine<string,List<string>> ---");
db2.showEnumerableDB();
XElement noSqlDb = new XElement("NoSqlDb");
XElement keyType = new XElement("KeyType", typeof(int));
XElement payloadType = new XElement("PayloadType", typeof(string));
XElement request_msg = new XElement("Request_Message");
XElement req_type = new XElement("Request_Type", "Insert");
XElement key = new XElement("Key", 45);
XElement name = new XElement("Name", "element_one");
XElement descr = new XElement("Description", "Descr of element_one");
XElement payload = new XElement("Payload", "This the payload of element one.");
request_msg.Add(req_type);
request_msg.Add(key);
request_msg.Add(name);
request_msg.Add(descr);
request_msg.Add(payload);
Console.WriteLine("Message = \n{0}", request_msg.ToString());
XElement Rmsg = XElement.Parse(request_msg.ToString());
string Rtype = Rmsg.Element("Request_Type").Value;
Console.WriteLine("Request type = {0}", Rtype);
XElement abc = new XElement("dummy");
XElement result = new XElement("Result", "Success");
//Console.WriteLine("abc= {0}\nresult = {1}\n", abc.ToString(), result.ToString());
//abc = result;
Console.WriteLine("abc= {0}\nresult = {1}", abc.ToString(), result.ToString());
int k = 5;
string ts = "Could not find element with key " + k.ToString() + " in database";
//XElement tst = new XElement("Result", "Could not find element with key {0} in database", k);
XElement tst = new XElement("Result", ts);
Console.WriteLine("tst = {0}", tst.ToString());
XElement qry = new XElement("Query_Response");
XElement par = new XElement("Partial", "This is \njust payload");
qry.Add(tst);
qry.Add(par);
Console.WriteLine("qry = \n{0}", qry.ToString());
Console.WriteLine("value of qry response =\n{0}", qry.Value.ToString());
//noSqlDb.Add(keyType);
//noSqlDb.Add(payloadType);
//Console.WriteLine("\nString mesage = \n{0}", noSqlDb.ToString());
//string xml_string = noSqlDb.ToString();
//XElement abc = XElement.Parse(xml_string);
//XElement root = abc.Element("KeyType");
//Console.WriteLine("abc= {0}", abc.ToString());
//Console.WriteLine("root= {0}", root.ToString());
//elem.name = xml_dbElement.Element("Name").Value;
//string par = root.Value;
//Console.WriteLine("par = {0}", par);
}
static void Main(string[] args)
{
"Testing DBEngine Package".title('=');;
WriteLine();
"Test db of scalar elements".title();
WriteLine();
DBElement <int, string> elem1 = new DBElement <int, string>();
elem1.payload = "a payload";
DBElement <int, string> elem2 = new DBElement <int, string>("Darth Vader", "Evil Overlord");
elem2.payload = "The Empire strikes back!";
var elem3 = new DBElement <int, string>("Luke Skywalker", "Young HotShot");
elem3.payload = "X-Wing fighter in swamp - Oh oh!";
if (verbose)
{
Write("\n --- Test DBElement<int,string> ---");
WriteLine();
elem1.showElement();
WriteLine();
elem2.showElement();
WriteLine();
elem3.showElement();
WriteLine();
/* ElementFormatter is not ready for prime time yet */
//Write(ElementFormatter.formatElement(elem1.showElement<int, string>(), false));
}
Write("\n --- Test DBEngine<int,DBElement<int,string>> ---");
WriteLine();
int key = 0;
Func <int> keyGen = () => { ++key; return(key); };
DBEngine <int, DBElement <int, string> > db = new DBEngine <int, DBElement <int, string> >();
bool p1 = db.insert(keyGen(), elem1);
bool p2 = db.insert(keyGen(), elem2);
bool p3 = db.insert(keyGen(), elem3);
if (p1 && p2 && p3)
{
Write("\n all inserts succeeded");
}
else
{
Write("\n at least one insert failed");
}
db.showDB();
WriteLine();
"Test db of enumerable elements".title();
WriteLine();
DBElement <string, List <string> > newelem1 = new DBElement <string, List <string> >();
newelem1.name = "newelem1";
newelem1.descr = "test new type";
newelem1.payload = new List <string> {
"one", "two", "three"
};
DBElement <string, List <string> > newerelem1 = new DBElement <string, List <string> >();
newerelem1.name = "newerelem1";
newerelem1.descr = "better formatting";
newerelem1.payload = new List <string> {
"alpha", "beta", "gamma"
};
newerelem1.payload.Add("delta");
newerelem1.payload.Add("epsilon");
DBElement <string, List <string> > newerelem2 = new DBElement <string, List <string> >();
newerelem2.name = "newerelem2";
newerelem2.descr = "better formatting";
newerelem2.children.AddRange(new List <string> {
"first", "second"
});
newerelem2.payload = new List <string> {
"a", "b", "c"
};
newerelem2.payload.Add("d");
newerelem2.payload.Add("e");
if (verbose)
{
Write("\n --- Test DBElement<string,List<string>> ---");
WriteLine();
newelem1.showEnumerableElement();
WriteLine();
newerelem1.showEnumerableElement();
WriteLine();
newerelem2.showEnumerableElement();
WriteLine();
}
Write("\n --- Test DBEngine<string,DBElement<string,List<string>>> ---");
int seed = 0;
string skey = seed.ToString();
Func <string> skeyGen = () => {
++seed;
skey = "string" + seed.ToString();
skey = skey.GetHashCode().ToString();
return(skey);
};
DBEngine <string, DBElement <string, List <string> > > newdb =
new DBEngine <string, DBElement <string, List <string> > >();
newdb.insert(skeyGen(), newelem1);
newdb.insert(skeyGen(), newerelem1);
newdb.insert(skeyGen(), newerelem2);
newdb.showEnumerableDB();
Write("\n\n");
}