public Task <SpannerClient> AcquireClientAsync(ISpannerClientFactory clientFactory, Logger logger)
{
Task <SpannerClient> result;
lock (_sync)
{
var snapshotMaximumChannels = SpannerOptions.Instance.MaximumGrpcChannels;
//first ensure that the pool is of the correct size.
while (_clientPriorityList.Count > snapshotMaximumChannels)
{
_clientPriorityList.RemoveLast();
}
while (_clientPriorityList.Count < snapshotMaximumChannels)
{
var newEntry = new SpannerClientCreator(_key);
_clientPriorityList.Add(newEntry);
}
//now grab the first item in the sorted list, increment refcnt, re-sort and return.
//The re-sorting will happen as a consequence of AcquireClientAsync changing its
//state and firing an event the prioritylist listens to.
result = _clientPriorityList.GetTop().AcquireClientAsync(clientFactory, logger);
}
return(result);
}
public async Task <SpannerClient> AcquireClientAsync(ISpannerClientFactory clientFactory)
{
if (_creationTask == null || _creationTask.Value.IsFaulted)
{
//retry an already failed task.
_creationTask = new Lazy <Task <SpannerClient> >(
() => clientFactory.CreateClientAsync(_parentKey.Endpoint, _parentKey.Credential));
}
var spannerClient = await _creationTask.Value.ConfigureAwait(false);
Interlocked.Increment(ref _refCount);
OnPriorityChanged();
return(spannerClient);
}
// ReSharper disable once MemberCanBePrivate.Global
internal ClientPool(ISpannerClientFactory clientFactory = null)
{
_clientFactory = clientFactory ?? SpannerClientFactory.Default;
}