public async Task PutAsync(string node, string key, JToken value, VersionVector context)
{
var requestUri = GetRequestUri(node, key);
using (var client = new HttpClient())
{
var req = new HttpRequestMessage(HttpMethod.Put, requestUri);
req.Headers.Add("X-Context", context.ToString());
req.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(JsonMediaType));
// TODO: Serialize JSON to stream, not string
//MemoryStream stream = new MemoryStream();
//StreamReader streamWriter = new StreamReader(stream);
//using (JsonWriter jsonWriter = new JsonTextWriter(streamWriter))
//{
// JsonSerializer serializer = new JsonSerializer();
// serializer.Serialize(jsonWriter, value);
//}
//req.Content = new StreamContent();
string json = JsonConvert.SerializeObject(value);
req.Content = new StringContent(json, Encoding.UTF8, JsonMediaType);
HttpResponseMessage response = await client.SendAsync(req);
response.EnsureSuccessStatusCode();
}
}
public DottedVersionVector(CausalEvent dot, VersionVector v)
{
Ensure.That(dot, "dot").IsNotNull();
Ensure.That(v, "v").IsNotNull();
_dot = dot;
_v = v;
}
/// <summary>
/// Remove obsolete versions.
/// </summary>
public Siblings Discard(Siblings s, VersionVector context)
{
Ensure.That(s, "s").IsNotNull();
Ensure.That(context, "context").IsNotNull();
// discard all siblings that are obsolete because they are included
// in the context.
IEnumerable <VersionedObject> concurrent = s.Where(sibling => !sibling.Clock.HappensBefore(context));
return(new Siblings(concurrent));
}
/// <summary>
/// Generates a new clock.
/// </summary>
public DottedVersionVector Event(VersionVector context, Siblings s, string i)
{
Ensure.That(s, "s").IsNotNull();
Ensure.That(context, "context").IsNotNull();
Ensure.That(i, "i").IsNotNullOrEmpty();
long maxDot = s.MaxDot(i);
long maxCausalHistory = context[i];
long maxCounter = Math.Max(maxDot, maxCausalHistory);
var dot = new CausalEvent(i, maxCounter + 1);
return(new DottedVersionVector(dot, context));
}
public static VersionVector Parse(string value)
{
VersionVector parsed;
if (string.IsNullOrWhiteSpace(value))
{
parsed = new VersionVector();
}
else
{
parsed = (VersionVector)Parser.Value.Parse(value);
}
return(parsed);
}
internal async Task PutAsync(string key, JToken value, VersionVector context = null)
{
Ensure.That(key, "key").IsNotNullOrWhiteSpace();
context = context ?? new VersionVector();
string coordinatingNode = _ring.Node(key);
if (_ring.PreferenceList(key, N).Contains(_name))
{
Log.DebugFormat("put k={0}", key);
BigInteger hash = _ring.Hash(key);
Siblings siblings = _data.GetValueOrDefault(hash);
if (siblings != null)
{
// discard obsolete versions
siblings = _kernel.Discard(siblings, context);
}
else
{
siblings = new Siblings();
}
DottedVersionVector dvv = _kernel.Event(context, siblings, _name);
var versionedObject = new VersionedObject(value, dvv);
siblings.Add(versionedObject);
_data[hash] = siblings;
await ReplicatePutAsync(key, siblings);
}
else
{
Log.DebugFormat("forward to coordinating node {0}", coordinatingNode);
await _remote.PutAsync(coordinatingNode, key, value, context);
}
}
public bool HappensBefore(VersionVector vv)
{
Ensure.That(vv, "vv").IsNotNull();
return(_dot.N <= vv[_dot.I]);
}
