private async Task <SampleCustomer> UpdateItemAsync(DocumentClient client, Uri collectionUri, SampleCustomer item)
{
//DeepCopy the item
item = Helpers.Clone(item);
//Make a change to the item to update.
item.Region = Helpers.ParseEndpoint(client.WriteEndpoint);
item.UserDefinedId = Helpers.RandomNext(0, 1000);
Console.WriteLine($"Update - Name: {item.Name}, City: {item.City}, UserDefId: {item.UserDefinedId}, Region: {item.Region}");
try
{
var response = await client.ReplaceDocumentAsync(item.SelfLink, item, new RequestOptions
{
AccessCondition = new AccessCondition
{
Type = AccessConditionType.IfMatch,
Condition = item.ETag
}
});
return((SampleCustomer)(dynamic)response.Resource);
}
catch (DocumentClientException ex)
{
if (ex.StatusCode == HttpStatusCode.PreconditionFailed || ex.StatusCode == HttpStatusCode.NotFound)
{
//No conflict is induced.
return(null);
}
throw;
}
}
private async Task <SampleCustomer> InsertItemAsync(DocumentClient client, Uri collectionUri, SampleCustomer item)
{
//DeepCopy the item
item = Helpers.Clone(item);
//Update UserDefinedId for each item to random number for Conflict Resolution
item.UserDefinedId = Helpers.RandomNext(0, 1000);
//Update the write region to the client regions so we know which client wrote the item
item.Region = Helpers.ParseEndpoint(client.WriteEndpoint);
Console.WriteLine($"Attempting insert - Name: {item.Name}, City: {item.City}, UserDefId: {item.UserDefinedId}, Region: {item.Region}");
try
{
var response = await client.CreateDocumentAsync(collectionUri, item);
return((SampleCustomer)(dynamic)response.Resource);
}
catch (DocumentClientException ex)
{
if (ex.StatusCode == System.Net.HttpStatusCode.Conflict)
{
//Item has already replicated so return null
return(null);
}
throw;
}
}
