private async Task <SampleCustomer> InsertItemAsync(Container container, string region, SampleCustomer item)
{
//DeepCopy the item
item = ConflictGenerator.Clone(item);
//Update the region
item.Region = region;
//Update UserDefinedId to random number for Conflict Resolution
item.UserDefinedId = ConflictGenerator.RandomNext(0, 1000);
Console.WriteLine($"Attempting insert - Name: {item.Name}, City: {item.City}, UserDefId: {item.UserDefinedId}, Region: {item.Region}");
try
{
ItemResponse <SampleCustomer> response = await container.CreateItemAsync <SampleCustomer>(item, new PartitionKey(item.MyPartitionKey));
if (response.StatusCode == System.Net.HttpStatusCode.Conflict)
{
return(null); //item has already replicated so not possible to generate conflict
}
else
{
return(response.Resource);
}
}
catch (CosmosException e)
{
//Conflict error
if (e.StatusCode == HttpStatusCode.Conflict)
{
return(null);
}
else
{
throw e;
}
}
}
public async Task GenerateUpdateConflicts(ConflictGenerator conflict)
{
try
{
//Verify the containers are created and referenced
await InitializeConflicts(conflict);
bool isConflicts = false;
Console.WriteLine($"\n{conflict.testName}\nPress any key to continue...");
Console.ReadKey(true);
Console.WriteLine($"Insert an item to create an update conflict on.\n");
//Get reference to West US 2 region to insert a customer
ReplicaRegion insertRegion = conflict.replicaRegions.Find(s => s.region == "West US 2");
//Container to insert customer
Container insertContainer = insertRegion.container;
//Generate a new customer
SampleCustomer seedCustomer = SampleCustomer.GenerateCustomers(conflict.partitionKeyValue, 1)[0];
//Insert Customer
seedCustomer = await InsertItemAsync(insertContainer, insertRegion.region, seedCustomer);
//Wait for item to replicate globally
Console.WriteLine($"\nAllow item to replicate.\n");
//await Task.Delay(5000);
await VerifyItemReplicated(conflict, seedCustomer);
//Task list for async updates
IList <Task <SampleCustomer> > tasks = new List <Task <SampleCustomer> >();
//Read back the replicated customer and get the ETag
ItemResponse <SampleCustomer> customerResponse = await insertContainer.ReadItemAsync <SampleCustomer>(seedCustomer.Id, new PartitionKey(seedCustomer.MyPartitionKey));
Console.WriteLine($"Attempting simultaneous update in {replicaRegions.Count} regions\n");
while (!isConflicts)
{
foreach (ReplicaRegion updateRegion in conflict.replicaRegions)
{
//DeepCopy the item
SampleCustomer updateCustomer = ConflictGenerator.Clone(seedCustomer);
//Update region to where update is made and provide new UserDefinedId value
updateCustomer.Region = updateRegion.region;
updateCustomer.UserDefinedId = ConflictGenerator.RandomNext(0, 1000);
//Add update to Task List
tasks.Add(UpdateItemAsync(updateRegion.container, updateCustomer));
}
SampleCustomer[] updateCustomers = await Task.WhenAll(tasks);
isConflicts = IsConflict(updateCustomers);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message + "\nPress any key to continue");
Console.ReadKey();
}
}
