public RateLimitingBuffer(int timeSpan)
{
TimeSpan = timeSpan;
CircularBuffer = new RateLimitingBucket[TimeSpan + 1];
for (int i = 0; i < CircularBuffer.Length; i++)
{
CircularBuffer[i] = new RateLimitingBucket(0);
}
}
public void ReduceRate(string requestIdentity, long requestTimeInSeconds)
{
for (int i = 0; i < CircularBuffer.Length; i++)
{
RateLimitingBucket bucket = CircularBuffer[i];
if (bucket.TimeInSeconds == requestTimeInSeconds)
{
bucket.DecreaseRequestCount(requestIdentity);
break;
}
}
}
public int GetRate(string requestIdentity, long requestTimeInSeconds)
{
int rate = 0;
for (int i = 0; i < CircularBuffer.Length; i++)
{
RateLimitingBucket bucket = CircularBuffer[i];
if (requestTimeInSeconds - bucket.TimeInSeconds < TimeSpan)
{
rate += bucket[requestIdentity];
}
}
return(rate);
}
public void AddRate(string requestIdentity, long requestTimeInSeconds)
{
if (CircularBuffer[_bufferEnd].TimeInSeconds < requestTimeInSeconds)
{
if (Monitor.TryEnter(AddBucketLock))
{
try
{
if (CircularBuffer[_bufferEnd].TimeInSeconds < requestTimeInSeconds)
{
int newBufferEnd = (_bufferEnd + 1) % CircularBuffer.Length;
CircularBuffer[newBufferEnd] = new RateLimitingBucket(requestTimeInSeconds);
_bufferEnd = newBufferEnd;
}
}
finally
{
Monitor.Exit(AddBucketLock);
}
}
}
CircularBuffer[_bufferEnd].IncreaseRequestCount(requestIdentity);
}