public Action<Message> persistDB(DBEngine<int, DBElement<int, string>> db)
{
Action<Message> PersistDB = (msg) =>
{
IntAndString pe = new IntAndString(db);
XDocument doc = XDocument.Parse(msg.content);
string XmlFile = doc.Descendants("Msg").Descendants("Data").Descendants("FileName").ElementAt(0).Value;
pe.writeToXML(XmlFile);
msg.content = "Persist success";
Utilities.swapUrls(ref msg);
Console.Write("\n\n The database has been persisted");
};
return PersistDB;
}
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");
}
}
//----< write enumerable db elements out to Console >--------------
public static string show <Key, Value, Data, T>(this DBEngine <Key, Value> db)
where Data : IEnumerable <T>
{
StringBuilder displayString = new StringBuilder();
foreach (Key key in db.Keys())
{
Value value;
db.getValue(key, out value);
DBElement <Key, Data> elem = value as DBElement <Key, Data>;
displayString.Append("\n\n -- key = " + key + " --");
displayString.Append(elem.showElement <Key, Data, T>());
}
return(displayString.ToString());
}
public Scheduler(DBEngine <int, DBElement <int, string> > db1, int time)
{
scheduler.Interval = time;
scheduler.AutoReset = true;
// Note use of timer's Elapsed delegate, binding to subscriber lambda
// This delegate is invoked when the internal timer thread has waited
// for the specified Interval.
scheduler.Elapsed += (object source, ElapsedEventArgs e) =>
{
c.writeToXML(db1);
Console.Write("\n an event occurred at {0}" + e.SignalTime);
};
}
public Action<Message> restoreDB(DBEngine<string, DBElement<string, List<string>>> db)
{
Action<Message> RestoreDB = (msg) =>
{
StringAndStringList pe = new StringAndStringList(db);
XDocument doc = XDocument.Parse(msg.content);
string XmlFile = doc.Descendants("Msg").Descendants("Data").Descendants("FileName").ElementAt(0).Value;
pe.writeToXML(XmlFile);
Console.Write("\n\n ---The database has been restored ---");
pe.persistDB.showEnumerableDB();
msg.content = "Restore success";
Utilities.swapUrls(ref msg);
};
return RestoreDB;
}
//<-----------------Retrieves keys of all DBElements with pattern in metadata section.
XElement keys_metada <Key, Data>(XElement request_msg, DBEngine <Key, DBElement <Key, Data> > db)
{
Console.Write("\n Request to Query for DBElements");
try
{
string pat = request_msg.Element("Pattern").Value;
Console.WriteLine(" with pattern - \"{0}\" present in metadata.", pat);
List <Key> result_list = sendQuery.get_keys_with_metadata <Key, DBElement <Key, Data>, Data>(db, pat);
if (result_list == null)
{
XElement response_msg = new XElement("Query_Response");
XElement type = new XElement("Query_Type", "Get Keys metadata");
string rst = "Could not find element with pattern - " + pat + " in metadata section";
XElement result = new XElement("Result", rst);
response_msg.Add(type);
response_msg.Add(result);
return(response_msg);
}
else
{
XElement response_msg = new XElement("Query_Response");
XElement type = new XElement("Query_Type", "Get Keys metadata");
XElement result = new XElement("Result", "Success");
string list_num = " Number of DBElements with pattern - \"" + pat + "\" in metadat = " + result_list.Count;
XElement par = new XElement("Partial", list_num);
XElement com = new XElement("Complete");
XElement data = new XElement("Text", " DBElements key list =");
com.Add(data);
foreach (Key child_k in result_list)
{
string child_space = " " + child_k.ToString();
XElement child_key = new XElement("Key", child_space);
com.Add(child_key);
}
response_msg.Add(type);
response_msg.Add(result);
response_msg.Add(par);
response_msg.Add(com);
return(response_msg);
}
}
catch (Exception)
{
Console.WriteLine("\n XML file for request message is not in the expected format. A particular tag could not be found.");
XElement response_msg = new XElement("Result", "Could not insert element into database");
return(request_msg);
}
}
public void insertData(DBEngine <int, DBElement <int, string> > db)
{
DBElement <int, string> elem1 = new DBElement <int, string>();
elem1.name = "India";
elem1.descr = "Country";
elem1.timeStamp = DateTime.Now;
elem1.children.AddRange(new List <int> {
2, 3
});
elem1.payload = "Famous cricket player";
db.insert(1, elem1);
DBElement <int, string> elem2 = new DBElement <int, string>();
elem2.name = "Roger federer";
elem2.descr = "Tennis player";
elem2.timeStamp = DateTime.Now.AddDays(-15);
elem2.children.AddRange(new List <int> {
3
});
elem2.payload = "Famous tennis player";
db.insert(2, elem2);
DBElement <int, string> elem3 = new DBElement <int, string>();
elem3.name = "Usain Bolt";
elem3.descr = "Athelte";
elem3.timeStamp = DateTime.Now;
elem3.children.AddRange(new List <int> {
1
});
elem3.payload = "Fastest in the world";
db.insert(3, elem3);
DBElement <int, string> elem4 = new DBElement <int, string>();
elem4.name = "Saina Nehwal";
elem4.descr = "Badminton Player";
elem4.timeStamp = DateTime.Now;
elem4.children.AddRange(new List <int> {
2
});
elem4.payload = "Famous badminton player";
db.insert(4, elem4);
db.showDB();
WriteLine();
}
//<-------------------Retrieves child keys of a DBElement from database.
XElement get_children <Key, Data>(XElement request_msg, DBEngine <Key, DBElement <Key, Data> > db)
{
Console.Write("\n Request to Query for children of DB Element ");
try
{
Key k = (Key)Convert.ChangeType(request_msg.Element("Key").Value, typeof(Key));
Console.WriteLine(" with key - {0}", k);
List <Key> result_list = sendQuery.getChildren <Key, DBElement <Key, Data>, Data>(db, k);
if (result_list == null)
{
XElement response_msg = new XElement("Query_Response");
XElement type = new XElement("Query_Type", "Get Children");
string rst = "Could not find element with key - " + k.ToString() + " in database.";
XElement result = new XElement("Result", rst);
response_msg.Add(type);
response_msg.Add(result);
return(response_msg);
}
else
{
XElement response_msg = new XElement("Query_Response");
XElement type = new XElement("Query_Type", "Get Children");
XElement result = new XElement("Result", "Success");
string list_num = " Number of keys present in children list of DBelement with key - " + k.ToString() + " = " + result_list.Count;
XElement par = new XElement("Partial", list_num);
XElement com = new XElement("Complete");
XElement data = new XElement("Text", " Key list =");
com.Add(data);
foreach (Key child_k in result_list)
{
string child_space = " " + child_k.ToString();
XElement child_key = new XElement("Key", child_space);
com.Add(child_key);
}
response_msg.Add(type);
response_msg.Add(result);
response_msg.Add(par);
response_msg.Add(com);
return(response_msg);
}
}
catch (Exception)
{
Console.WriteLine("\n XML file for request message is not in the expected format. A particular tag could not be found.");
XElement response_msg = new XElement("Result", "Could not insert element into database");
return(request_msg);
}
}
private void test2()
{
Write("\n --- Test DBElement<string,List<string>> ---");
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");
Write(newerelem1.showElement <string, List <string>, string>());
WriteLine();
DBElement <string, List <string> > newerelem2 = new DBElement <string, List <string> >();
newerelem2.name = "newerelem2";
newerelem2.descr = "better formatting";
newerelem1.children.AddRange(new[] { "first", "second" });
newerelem2.payload = new List <string> {
"a", "b", "c"
};
newerelem2.payload.Add("d");
newerelem2.payload.Add("e");
Write(newerelem2.showElement <string, List <string>, string>());
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);
};
int key = 0;
Func <int> keyGen = () => { ++key; return(key); };
DBEngine <string, DBElement <string, List <string> > > newdb =
new DBEngine <string, DBElement <string, List <string> > >();
newdb.insert(skeyGen(), newerelem1);
newdb.insert(skeyGen(), newerelem2);
newdb.show <string, DBElement <string, List <string> >, List <string>, string>();
WriteLine();
}
public static List <Key> searchChildren <Key, Value>(this DBEngine <Key, DBElement <Key, Value> > dbEngine, Key key)
{
List <Key> children = new List <Key>();
DBElement <Key, Value> val;
if (dbEngine.containsKey(key))
{
dbEngine.getValue(key, out val);
foreach (var child in val.children)
{
children.Add(child);
}
return(children);
}
return(children);
}
//-------< Edit description of a particular DB-element >--------------------
public static bool editDescr <Key, Value, Data>(this DBEngine <Key, Value> db_edit, Key key1, string new_descr)
{
Value value;
if (db_edit.getValue(key1, out value))
{
DBElement <Key, Data> elem = value as DBElement <Key, Data>;
elem.descr = new_descr;
elem.timeStamp = DateTime.Now;
return(true);
}
else
{
return(false);
}
}
//-------< Replace payload of a particular DB-element with a new payload.>--------------------
public static bool editInstance <Key, Value, Data>(this DBEngine <Key, Value> db_edit, Key key1, Data new_instance)
{
Value value;
if (db_edit.getValue(key1, out value))
{
DBElement <Key, Data> elem = value as DBElement <Key, Data>;
elem.payload = new_instance;
elem.timeStamp = DateTime.Now;
return(true);
}
else
{
return(false);
}
}
static void Main(string[] args)
{
"Testing DBFactory Package".title('=');
WriteLine();
DBFactoryTest dbft = new DBFactoryTest();
"\nCreation of immutable database".title();
WriteLine();
"\nOriginal database".title();
DBEngine <int, DBElement <int, string> > db = new DBEngine <int, DBElement <int, string> >();
dbft.insertData(db);
"\n Fetch all the keys which are even from the above database".title();
try
{
QueryEngine <int, DBElement <int, string> > qEngine = new QueryEngine <int, DBElement <int, string> >(db);
Dictionary <int, DBElement <int, string> > dictFactory = new Dictionary <int, DBElement <int, string> >();
DBFactory <int, DBElement <int, string> > dbFactory;
var keys = qEngine.getListKeyPattern();
if (keys != null)
{
foreach (var key in keys)
{
var val = db.getValueOfKey(key);
dictFactory.Add(key, val); //add keys and values to the dictionary
}
dbFactory = new DBFactory <int, DBElement <int, string> >(dictFactory); //store the dictionary in the
WriteLine("\nThe below key/value pairs with even keys pattern are saved as an immutable database\n");
dbFactory.showDB(); //display the immutable database
WriteLine();
WriteLine();
}
else
{
WriteLine("\nNo keys are obtained from a query for creation of immutable database\n");
}
WriteLine();
WriteLine();
}
catch (Exception e)
{
Console.WriteLine("\n" + e.Message + "\n");
}
}
/*
* Retrive data from xml file. augmented in DBEngine.
*/
public void retrieveDataFromXML(DBEngine <int, DBElement <int, ListOfStrings> > dbEngine, String inputFile)
{
fileName = inputFile;
var elem = from c in document.Descendants("elements") select c;
for (int i = 0; i < elem.Elements().Count(); i++)
{
DBElement <int, ListOfStrings> dbElement = new DBElement <int, ListOfStrings>();
int key = Int32.Parse(elem.Elements().Attributes().ElementAt(i).Value);
for (int count = 0; count < elem.Elements().Attributes().ElementAt(i).Parent.Descendants().Count(); count++)
{
XElement elementRecord = elem.Elements().Attributes().ElementAt(i).Parent.Descendants().ElementAt(count);
if (elementRecord.Name.ToString().Equals("name"))
{
dbElement.name = elementRecord.Value;
}
else if (elementRecord.Name.ToString().Equals("desc"))
{
dbElement.descr = elementRecord.Value;
}
else if (elementRecord.Name.ToString().Equals("time"))
{
dbElement.timeStamp = DateTime.Parse(elementRecord.Value);
}
else if (elementRecord.Name.ToString().Equals("children"))
{
List <int> children = new List <int>();
for (int j = 0; j < elementRecord.Descendants().Count(); j++)
{
children.Add(Int32.Parse(elementRecord.Descendants().ElementAt(j).Value));
}
dbElement.children = children;
}
else if (elementRecord.Name.ToString().Equals("payload"))
{
ListOfStrings payload = new ListOfStrings();
for (int j = 0; j < elementRecord.Descendants().Count(); j++)
{
payload.theWrappedData.Add(elementRecord.Descendants().ElementAt(j).Value);
}
dbElement.payload = payload;
}
}
dbEngine.Dictionary.Add(key, dbElement);
}
}
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();
}
/*----------------------------------Category implementation----------------------------*/
public List <string> getKeyForCategory(DBEngine <string, DBElement <string, List <string> > > dbCat, List <string> category)
{
dynamic keys = dbCat.Keys();
List <string> matchedKeys = new List <string>();
foreach (var cat in category)
{
foreach (var key in keys)
{
if (cat == key)
{
matchedKeys.Add(key);
}
}
}
return(matchedKeys);
}
public static List <Key> searchMetadata <Key, Value>(this DBEngine <Key, DBElement <Key, Value> > dbEngine, string searchString)
{
List <Key> matchedKeys = new List <Key>();
dynamic keys = dbEngine.Keys();
DBElement <Key, Value> val;
foreach (var key in keys)
{
dbEngine.getValue(key, out val);
if (Regex.IsMatch(val.name, searchString) || Regex.IsMatch(val.descr, searchString))
{
matchedKeys.Add(key);
}
}
return(matchedKeys);
}
public static List <Key> searchForKeyPattern <Key, Value>(this DBEngine <Key, DBElement <Key, Value> > dbEngine, string keyPattern)
{
List <Key> matchedKeys = new List <Key>();
dynamic keys = dbEngine.Keys();
DBElement <Key, Value> val;
foreach (var key in keys)
{
dbEngine.getValue(key, out val);
if ((Regex.IsMatch(key, keyPattern)))
{
matchedKeys.Add(key);
}
}
return(matchedKeys);
}
private void test1()
{
Write("\n --- Test DBElement<int,string> ---");
DBElement <int, string> elem1 = new DBElement <int, string>();
elem1.payload = "a payload";
Write(elem1.showElement <int, string>());
WriteLine();
DBElement <int, string> elem2 = new DBElement <int, string>("Darth Vader", "Evil Overlord");
elem2.payload = "The Empire strikes back!";
Write(elem2.showElement <int, string>());
WriteLine();
var elem3 = new DBElement <int, string>("Luke Skywalker", "Young HotShot");
elem3.children.AddRange(new List <int> {
1, 5, 23
});
elem3.payload = "X-Wing fighter in swamp - Oh oh!";
Write(elem3.showElement <int, string>());
WriteLine();
Write("\n --- Test DBEngine<int,DBElement<int,string>> ---");
int key = 0;
Func <int> keyGen = () => { ++key; return(key); }; // anonymous function to generate keys
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.show <int, DBElement <int, string>, string>();
WriteLine();
}
//defining delegate for querying key patterns
public Func <Key, bool> defineQueryKeySearch(string search, DBEngine <Key, DBElement <Key, Data> > dbEngine)
{
Func <Key, bool> queryPredicate = null;
//lambda that checks whether the key pattern matches
queryPredicate = (Key key) =>
{
if (dbEngine.Dictionary != null)
{
if (key.ToString().Contains(search))
{
return(true);
}
}
return(false);
};
return(queryPredicate);
}
public static bool removeRelationship <Key, Value>(this DBEngine <Key, DBElement <Key, Value> > dbEngine, Key key, List <Key> children)
{
DBElement <Key, Value> elem;
if (dbEngine.containsKey(key))
{
dbEngine.getValue(key, out elem);
foreach (var child in children)
{
if (elem.children.Contains(child))
{
elem.children.Remove(child);
}
}
return(true);
}
return(false);
}
public static List <string> searchForKeysInCategory(this DBEngine <string, DBElement <string, List <string> > > dbEngine, List <string> category)
{
List <string> matchedKeys = new List <string>();
dynamic keys = dbEngine.Keys();
foreach (var cat in category)
{
//dbEngine.getValue(cat, out val);
foreach (var key in keys)
{
if (category.Contains(key))
{
matchedKeys.Add(key);
}
}
}
return(matchedKeys);
}
private void test3()
{
DBEngine <int, DBElement <int, string> > db = new DBEngine <int, DBElement <int, string> >();
DBEngine <string, DBElement <string, List <string> > > dbString = new DBEngine <string, DBElement <string, List <string> > >();
ItemFactory <int, string> itemFactory = new ItemFactory <int, string>();
//---------------Search for data with specified time interval---------------
"Search for data with specified time interval:".title('.');
WriteLine("\n\n Elements in DB :");
var elem = new DBElement <int, string>();
elem.name = "old element";
elem.descr = "old test element";
elem.timeStamp = DateTime.Now.AddDays(-3);
elem.children.AddRange(new List <int> {
85, 27, 65
});
elem.payload = "old elem's payload";
DBElement <int, string> elem1 = new DBElement <int, string>();
elem1.name = "old2 element";
elem1.descr = "old2 test element";
elem1.timeStamp = DateTime.Now.AddDays(-2);
elem1.children.AddRange(new List <int> {
11, 12, 13
});
elem1.payload = "old2 elem's payload";
WriteLine("\n\n Search for Key which is created between {0} and {1}:\n\n", DateTime.Now.AddDays(-5).Date, DateTime.Now.AddDays(-1).Date);
db.insert(99, elem);
db.insert(50, elem1);
db.showDB();
WriteLine();
var resultkeys = db.searchForTimeStamp(DateTime.Now.AddDays(-5), DateTime.Now.AddDays(-1));
WriteLine("\n\nThe result is:\n\n");
foreach (var item in resultkeys)
{
Write("{0}, ", item);
}
//---------------Search for data with specified time interval---------------
}
//persists data into XML by taking DBengine and file as argument
public bool persistXML(DBEngine <Key, DBElement <Key, Data> > dbEngine)
{
fileName = @".\" + inputFile;
string valueType = "ListOfStrings";
string keyType = "string";
loadXmlFile();
addKeyAndPayloadType(keyType, valueType);
IEnumerable <Key> enums = dbEngine.Keys();
foreach (Key key in enums)
{
if (!addRecord(key, dbEngine.Dictionary[key]))
{
return(false);
}
}
return(true);
}
static void Main(string[] args)
{
//test stun for persist engine
"Testing PersistEngine Package".title();
WriteLine();
PersistEngine <int, string> persistEngine = new PersistEngine <int, string>();
"Testing Persist Engine Package".title('=');
DBElement <int, string> elem = new DBElement <int, string>();
DBEngine <int, DBElement <int, string> > dbEngine = new DBEngine <int, DBElement <int, string> >();
//creating metdata
"Metadata with data dictionary is ".title();
elem.name = "X";
elem.descr = "description";
elem.timeStamp = DateTime.Parse("09/20/2015 11:36:58 PM");
elem.children = new List <int> {
2, 3, 4
};
elem.payload = "payload";
dbEngine.insert(1, elem);
elem = new DBElement <int, string>();
elem.name = "XX";
elem.descr = "description";
elem.timeStamp = DateTime.Now;
elem.children = new List <int> {
5, 6, 7
};
elem.payload = "payload";
dbEngine.insert(12, elem);
dbEngine.showDB();
//persisting metadata into XML
"Write in-memory database in XML file, please check DataPersistTest.xml file in Path:./PersistEngine/bin/debug.".title('-');
persistEngine.persistXML(dbEngine);
"Deleting in-memory database".title('-');
dbEngine.Dictionary.Clear();
"Database restored or augmented from an existing XML (DataPersistTest.xml) file".title('-');
persistEngine.retrieveDataFromXMLTypeTwo(dbEngine, "DataPersistTest.xml", 10);
dbEngine.showDB();
WriteLine();
Write("\n\n");
}
public static void toXml(this DBEngine <string, DBElement <string, List <string> > > dbEngine)
{
dynamic dict = dbEngine.Keys();
DBElement <string, List <string> > result;
XDocument xmlDoc = new XDocument();
XElement root = new XElement("noSqlDb");
xmlDoc.Add(root);
foreach (var key in dict)
{
dbEngine.getValue(key, out result);
XElement element = new XElement("element");
root.Add(element);
XElement keyValue = new XElement("key", key);
element.Add(keyValue);
XElement value = new XElement("value");
element.Add(value);
XElement children = new XElement("children");
value.Add(children);
foreach (var item in result.children)
{
XElement child = new XElement("child", item);
children.Add(child);
}
XElement description = new XElement("description", result.descr);
XElement name = new XElement("name");
name.SetValue(result.name);
XElement timestamp = new XElement("timestamp", result.timeStamp);
XElement payLoad = new XElement("payload");
value.Add(description);
value.Add(name);
value.Add(timestamp);
value.Add(payLoad);
foreach (var item in result.payload)
{
XElement load = new XElement("load", item);
payLoad.Add(load);
}
}
saveXml(xmlDoc);
}
//<-------------------Adds child relation to a DBElement
XElement add_children <Key, Data>(XElement request_msg, DBEngine <Key, DBElement <Key, Data> > db)
{
Console.Write("\n Request to Add child relation for DB Element");
XElement response_msg = new XElement("Query_Response");
XElement type = new XElement("Query_Type", "Add Children");
XElement result = new XElement("Result", "Could not Add children to DBElement");
try
{
Key k = (Key)Convert.ChangeType(request_msg.Element("Key").Value, typeof(Key));
Console.WriteLine(" with key - {0}", k);
bool final_res = true;
foreach (var new_key in request_msg.Element("Children").Elements("Key"))
{
Key child_key = (Key)Convert.ChangeType(new_key.Value, typeof(Key));
bool res = db.addRelation <Key, DBElement <Key, Data>, Data>(k, child_key);
if (!res)
{
final_res = false;
}
}
if (final_res)
{
result = new XElement("Result", "Child Relation added successfully to DB Element.");
}
else
{
result = new XElement("Result", "Could not add Child Relation to DB Element.");
}
response_msg.Add(type);
response_msg.Add(result);
return(response_msg);
}
catch (NullReferenceException ex)
{
Console.WriteLine("\n XML file for request message is not in the expected format. A particular tag could not be found.\n Exception = {0}", ex);
response_msg.Add(type);
response_msg.Add(result);
return(response_msg);
}
}
//-------< Get keys of DBElements written within a specified time interval >-------------
public List <Key> get_keys_within_timeInterval <Key, Value, Data>(DBEngine <Key, Value> db, DateTime t1, DateTime t2 = default(DateTime))
{
List <Key> key_collection = new List <Key>();
if (t2 == default(DateTime))
{
t2 = DateTime.Now;
}
foreach (Key key in db.Keys())
{
Value value;
db.getValue(key, out value);
DBElement <Key, Data> elem = value as DBElement <Key, Data>;
if (DateTime.Compare(elem.timeStamp, t1) >= 0 && DateTime.Compare(elem.timeStamp, t2) <= 0)
{
key_collection.Add(key);
}
}
return(key_collection);
}
public Action<Message>delete(DBEngine<int, DBElement<int, string>> db)
{
Action<Message> Delete = (msg) =>
{
XDocument doc = XDocument.Parse(msg.content.ToString());
int key = int.Parse(doc.Descendants("Msg").Descendants("Data").Descendants("key").ElementAt(0).Value);
Console.Write("\n\n delete an element which key = {0}", key);
Write("\n\n --- Database before delete ---");
db.showDB();
if (db.delete(key))
{
msg.content = "Delete success";
Console.Write("\n\n --- Database after delete---", key);
db.showDB();
}
else
msg.content = "Delete fail";
Utilities.swapUrls(ref msg);
};
return Delete;
}
public void processAugmentedMsg(XDocument xdoc, Sender sndr, Message msg, Server srvr)
{
DBEngine <string, DBElement <string, List <string> > > dbEngine = new DBEngine <string, DBElement <string, List <string> > >();
srvr.getDatafromXML(dbEngine, "augment.xml");
Message testMsg = new Message();
testMsg.toUrl = msg.fromUrl;
testMsg.fromUrl = msg.toUrl;
if (dbEngine.Keys().Count() > 0)
{
//dbEngine.showEnumerableDB();
testMsg.content = "\n*****************************************\n" + "\nDatabase augmented successfully in Database instance: name - dbEngine ";
}
else
{
testMsg.content = "\nDatabase augmentation failed";
}
sndr.sendMessage(testMsg);
}