public SyncResponse Sync(SyncRequest request)
{
lock (this.changeSetLock)
{
if (this.sharedChangeSetN == 0)
{
using (var db = new BrennContext())
{
this.sharedChangeSetN =
new[]
{
db.Expenses.Max<Expense, int?>(e => e.ChangeSetN),
db.Trips.Max<Trip, int?>(e => e.ChangeSetN),
db.People.Max<Person, int?>(e => e.ChangeSetN)
}.Max().GetValueOrDefault(1);
}
}
}
var anyUpdates = (request.ExpenseUpdates == null ? 0 : request.ExpenseUpdates.Count) +
(request.TripUpdates == null ? 0 : request.TripUpdates.Count) +
(request.PersonUpdates == null ? 0 : request.PersonUpdates.Count) > 0;
var changeSetN = anyUpdates ? Interlocked.Increment(ref this.sharedChangeSetN) : this.sharedChangeSetN;
var response = new SyncResponse
{
ExpenseUpdateResults = new List<UpdateResult>(),
TripUpdateResults = new List<UpdateResult>(),
PersonUpdateResults = new List<UpdateResult>(),
ServerChangeSetN = changeSetN
};
var updatedExpenseIds = new List<int>();
var updatedTripIds = new List<int>();
var updatedPersonIds = new List<int>();
PerformExpenseUpdates(request, response, updatedExpenseIds);
PerformTripUpdates(request, response, updatedTripIds);
PerformPersonUpdates(request, response, updatedPersonIds);
using (var db = new BrennContext())
{
((IObjectContextAdapter)db).ObjectContext.ContextOptions.ProxyCreationEnabled = false;
response.Expenses =
new List<Expense>(
db.Expenses.Include("Receivers").Where(
e => e.ChangeSetN > request.ClientChangeSetN && !updatedExpenseIds.Contains(e.ExpenseId)));
response.Trips =
new List<Trip>(
db.Trips
.Where(
e => e.ChangeSetN > request.ClientChangeSetN && !updatedTripIds.Contains(e.TripId)));
response.Trips.ForEach(t => t.Expenses = null);
response.People =
new List<Person>(
db.People
.Where(e => e.ChangeSetN > request.ClientChangeSetN && !updatedPersonIds.Contains(e.PersonId)));
}
return response;
}
private static void PerformTripUpdates(
SyncRequest request, SyncResponse response, ICollection<int> updatedTripIds)
{
if (request.TripUpdates == null)
{
return;
}
foreach (var tripUpdate in request.TripUpdates)
{
if (tripUpdate.ClientRowId == default(Guid))
{
throw new Exception("The client row id must be set.");
}
using (var db = new BrennContext())
{
using (var scope = new TransactionScope())
{
if (tripUpdate.Trip.TripId == default(int))
{
db.Trips.Add(tripUpdate.Trip);
}
else
{
var trip = db.Trips.Find(tripUpdate.Trip.TripId);
if (trip == null)
{
response.TripUpdateResults.Add(
new UpdateResult
{
Error = UpdateError.DeletedOnServer, ClientRowId = tripUpdate.Trip.RowId
});
continue;
}
if (trip.RowId != tripUpdate.ClientRowId)
{
response.TripUpdateResults.Add(
new UpdateResult
{
Error = UpdateError.ModifiedOnServer, ClientRowId = tripUpdate.Trip.RowId
});
continue;
}
var entry = db.Entry(trip);
entry.CurrentValues.SetValues(tripUpdate.Trip);
}
db.SaveChanges();
scope.Complete();
}
response.TripUpdateResults.Add(
new UpdateResult { Error = null, ClientRowId = tripUpdate.Trip.RowId });
updatedTripIds.Add(tripUpdate.Trip.TripId);
}
}
}
private static void PerformPersonUpdates(
SyncRequest request, SyncResponse response, ICollection<int> updatedPersonIds)
{
if (request.PersonUpdates == null)
{
return;
}
foreach (var personUpdate in request.PersonUpdates)
{
using (var db = new BrennContext())
{
using (var scope = new TransactionScope())
{
var person = db.People.Find(personUpdate.Person.PersonId);
if (person == null)
{
response.PersonUpdateResults.Add(
new UpdateResult { Error = UpdateError.DeletedOnServer, ClientRowId = personUpdate.Person.RowId });
continue;
}
if (person.RowId != personUpdate.ClientRowId)
{
response.PersonUpdateResults.Add(
new UpdateResult { Error = UpdateError.ModifiedOnServer, ClientRowId = personUpdate.Person.RowId });
continue;
}
var entry = db.Entry(person);
entry.CurrentValues.SetValues(personUpdate.Person);
db.SaveChanges();
scope.Complete();
}
response.PersonUpdateResults.Add(
new UpdateResult { Error = null, ClientRowId = personUpdate.Person.RowId });
updatedPersonIds.Add(personUpdate.Person.PersonId);
}
}
}
private static void PerformExpenseUpdates(
SyncRequest request, SyncResponse response, List<int> updatedExpenseIds)
{
if (request.ExpenseUpdates == null)
{
return;
}
foreach (ExpenseUpdate expenseUpdate in request.ExpenseUpdates)
{
using (var db = new BrennContext())
{
using (var scope = new TransactionScope())
{
var expense = db.Expenses.Find(expenseUpdate.Expense.ExpenseId);
if (expense == null)
{
response.ExpenseUpdateResults.Add(
new UpdateResult
{ Error = UpdateError.DeletedOnServer, ClientRowId = expenseUpdate.Expense.RowId });
continue;
}
if (expense.RowId != expenseUpdate.ClientRowId)
{
response.ExpenseUpdateResults.Add(
new UpdateResult
{ Error = UpdateError.ModifiedOnServer, ClientRowId = expenseUpdate.Expense.RowId });
continue;
}
var entry = db.Entry(expense);
entry.CurrentValues.SetValues(expenseUpdate.Expense);
db.SaveChanges();
scope.Complete();
}
response.ExpenseUpdateResults.Add(
new UpdateResult { Error = null, ClientRowId = expenseUpdate.Expense.RowId });
updatedExpenseIds.Add(expenseUpdate.Expense.ExpenseId);
}
}
}
/// <summary>
/// The handle sync response without lock.
/// </summary>
/// <param name="response">
/// The response.
/// </param>
private void HandleSyncResponseWithoutLock(SyncResponse response)
{
Debug.WriteLine("Handling sync response with server change set {0}.", response.ServerChangeSetN);
if (response.ServerChangeSetN <= this.clientChangeSet)
{
Debug.WriteLine(
"Warning: The changeset number of the sync response is {0}, which is lower than or equal to the client version, {1}.",
response.ServerChangeSetN,
this.clientChangeSet);
}
else
{
this.clientChangeSet = response.ServerChangeSetN;
}
foreach (var update in response.ExpenseUpdateResults)
{
if (update.Error.HasValue)
{
Debug.WriteLine("Failed to update expense: {0}", update.Error);
}
else
{
Debug.WriteLine("Successful update of expense.");
}
}
foreach (var update in response.TripUpdateResults)
{
if (update.Error.HasValue)
{
Debug.WriteLine("Failed to update trip: {0}", update.Error);
}
else
{
Debug.WriteLine("Successful update of trip.");
}
}
foreach (var update in response.PersonUpdateResults)
{
if (update.Error.HasValue)
{
Debug.WriteLine("Failed to update person: {0}", update.Error);
}
else
{
Debug.WriteLine("Successful update of person.");
}
}
if (response.People != null)
{
response.People.ForEach(p => Repository.Instance.AddOrUpdate(p));
}
if (response.Trips != null)
{
foreach (var t in response.Trips)
{
Debug.Assert(t.Expenses == null, "The trip included its expenses.");
Repository.Instance.AddOrUpdate(t);
}
}
if (response.Expenses != null)
{
foreach (var expense in response.Expenses)
{
Debug.Assert(expense.Receivers != null, "Receivers was not included from the service.");
Debug.Assert(expense.Trip == null, "The trip should not be defined by the expense.");
Debug.Assert(expense.TripId > 0, "The trip id must be included.");
Repository.Instance.AddOrUpdate(expense);
}
}
}
/// <summary>
/// The handle sync response.
/// </summary>
/// <param name="response">
/// The response.
/// </param>
private void HandleSyncResponse(SyncResponse response)
{
if (response == null)
{
throw new ArgumentNullException("response");
}
lock (this.items)
{
this.HandleSyncResponseWithoutLock(response);
}
}
