static async Task<bool> UpdatePostWithCasAsync(Post post)
{
var bucket = ClusterHelper.GetBucket("default");
const int maxAttempts = 10;
var attempts = 0;
do
{
//get the original document - if it doesn't exist fail
var result = await bucket.GetAsync<Post>(post.PostId);
if (result.Status == ResponseStatus.KeyNotFound)
{
return false;
}
//update the original documents fields
var original = result.Value;
original.Content = post.Content;
original.Author = post.Author;
original.Views = original.Views++;
//perform the mutation passing in the CAS value
result = await bucket.UpsertAsync(original.PostId, original, result.Cas);
if (result.Success)
{
return true;
}
//failed so try again up until maxAttempts
} while (attempts++ < maxAttempts);
//we failed within maxAttemps
return false;
}
static void Main(string[] args)
{
ClusterHelper.Initialize(new ClientConfiguration
{
Servers = new List<Uri>
{
new Uri("http://localhost:8091/")
}
});
var bucket = ClusterHelper.GetBucket("default");
var revision0 = new Post
{
PostId = "p0001",
Author = "Stuie",
Published = new DateTime(2012, 1, 13),
Content = "A really cool blog post!",
Views = 0
};
//insert the first revision
bucket.Upsert(revision0.PostId, revision0);
Task.Run(() => UpdatePostWithCasAsync(revision0));
Console.Read();
ClusterHelper.Close();
}
