protected void OnReciveCommand(CacheBusCommand command)
{
if (command.Sequence < _LastReceivedSequence)
{
return;
}
if (_LastReceivedSequence > 0)
{
if (_LastReceivedSequence + 1 < command.Sequence)
{
PullMissingMessages(_LastReceivedSequence);
}
}
_LastReceivedSequence = command.Sequence.GetValueOrDefault();
if (command.Target != _Target)
{
return;
}
if (command.Sender == _InstanceId)
{
return;
}
if (command.Name == nameof(RemoveAsync))
{
IMemoryCacheDelegate.RemoveAsync(command.Key);
}
else if (command.Name == nameof(RemoveManyAsync))
{
IMemoryCacheDelegate.RemoveAsync(command.Key.ToObjectByJson <List <string> >());
}
else if (command.Name == nameof(ClearAsync))
{
IMemoryCacheDelegate.ClearAsync();
}
else if (command.Name == nameof(AddToSetAsync))
{
IMemoryCacheDelegate.AddToSetAsync(command.Key, command.Parameter);
}
else if (command.Name == nameof(RemoveFromSetAsync))
{
IMemoryCacheDelegate.RemoveFromSetAsync(command.Key, command.Parameter);
}
}
private async Task HandlePurge(CacheBusCommand command)
{
if (_NextPurge == null)
{
_NextPurge = ITimeService.Now.AddMinutes(20);
_NextPurgeSequence = command.Sequence.Value;
}
if (ITimeService.Now > _NextPurge)
{
await Purge(_NextPurgeSequence);
_NextPurge = ITimeService.Now.AddMinutes(20);
_NextPurgeSequence = command.Sequence.Value;
}
}
private async Task SendCommand(string name, string key = null, IEnumerable <string> parameter = null)
{
if (!_Started)
{
throw new Exception("Start first.");
}
var command = new CacheBusCommand
{
Created = ITimeService.Now,
Target = _Target,
Sender = _InstanceId,
Name = name,
Key = key,
Parameter = parameter
};
await TransferCommand(command);
await HandlePurge(command);
}
protected abstract Task TransferCommand(CacheBusCommand command);
