/// <summary>
/// Checks the primary node for the key, if a NMV is encountered, will retry on each replica, asynchronously.
/// </summary>
/// <typeparam name="T">The Type of the body of the request.</typeparam>
/// <param name="operation">The <see cref="IOperation" /> to execiute.</param>
/// <returns>
/// The <see cref="Task{IOperationResult}" /> object representing asynchcronous operation.
/// </returns>
public async Task <IOperationResult <T> > ReadFromReplicaAsync <T>(ReplicaRead <T> operation)
{
var tcs = new TaskCompletionSource <IOperationResult <T> >();
var cts = new CancellationTokenSource(OperationLifeSpan);
cts.CancelAfter(OperationLifeSpan);
var keyMapper = ConfigInfo.GetKeyMapper();
var vBucket = (IVBucket)keyMapper.MapKey(operation.Key);
operation.VBucket = vBucket;
operation.Completed = CallbackFactory.CompletedFuncForRetry(Pending, ClusterController, tcs);
Pending.TryAdd(operation.Opaque, operation);
IOperationResult <T> result = null;
if (vBucket.HasReplicas)
{
foreach (var index in vBucket.Replicas)
{
var replica = vBucket.LocateReplica(index);
if (replica == null)
{
continue;
}
await replica.SendAsync(operation).ContinueOnAnyContext();
result = await tcs.Task;
if (result.Success && !result.IsNmv())
{
return(result);
}
}
}
else
{
result = new OperationResult <T>
{
Id = operation.Key,
Status = ResponseStatus.NoReplicasFound,
Message = "No replicas found; have you configured the bucket for replica reads?",
Success = false
};
}
return(result);
}
/// <summary>
/// Checks the primary node for the key, if a NMV is encountered, will retry on each replica.
/// </summary>
/// <typeparam name="T">The Type of the body of the request.</typeparam>
/// <param name="operation">The <see cref="IOperation" /> to execiute.</param>
/// <returns>
/// The result of the operation.
/// </returns>
/// <exception cref="System.NotImplementedException"></exception>
public IOperationResult <T> ReadFromReplica <T>(ReplicaRead <T> operation)
{
var keyMapper = ConfigInfo.GetKeyMapper();
var vBucket = (IVBucket)keyMapper.MapKey(operation.Key);
operation.VBucket = vBucket;
IOperationResult <T> result = null;
if (vBucket.HasReplicas)
{
foreach (var index in vBucket.Replicas)
{
var replica = vBucket.LocateReplica(index);
if (replica == null)
{
continue;
}
result = replica.Send(operation);
if (result.Success && !result.IsNmv())
{
return(result);
}
operation = (ReplicaRead <T>)operation.Clone();
}
}
else
{
result = new OperationResult <T>
{
Status = ResponseStatus.NoReplicasFound,
Message = "No replicas found; have you configured the bucket for replica reads?",
Success = false
};
}
return(result);
}
