private Measurement doOneEncodeMeasurement(ReedSolomon codec, BufferSet[] bufferSets)
{
long passesCompleted = 0;
long bytesEncoded = 0;
long encodingTime = 0;
while (encodingTime < MEASUREMENT_DURATION)
{
BufferSet bufferSet = bufferSets[nextBuffer];
nextBuffer = (nextBuffer + 1) % bufferSets.Length;
byte[][] shards = bufferSet.buffers;
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
codec.encodeParity(shards, 0, BUFFER_SIZE);
stopwatch.Stop();
long stop = stopwatch.ElapsedMilliseconds;
TimeSpan timespan = stopwatch.Elapsed;
encodingTime += (long)timespan.TotalMilliseconds;
bytesEncoded += BUFFER_SIZE * DATA_COUNT;
passesCompleted += 1;
}
double seconds = ((double)encodingTime) / 1000.0;
double megabytes = ((double)bytesEncoded) / 1000000.0;
Measurement result = new Measurement(megabytes, seconds);
Console.WriteLine(" {0} passes, {1}", passesCompleted, result.ToString());
return(result);
}
/**
* Encodes a set of data shards, and then tries decoding
* using all possible subsets of the encoded shards.
*
* Uses 5+5 coding, so there must be 5 input data shards.
*/
private void runEncodeDecode(int dataCount, int parityCount, byte[][] dataShards)
{
int totalCount = dataCount + parityCount;
int shardLength = dataShards[0].Length;
// Make the list of data and parity shards.
// assertEquals(dataCount, dataShards.length);
int dataLength = dataShards[0].Length;
byte [] [] allShards = new byte [totalCount] [];
for (int i = 0; i < dataCount; i++)
{
byte[] temp = new byte[dataLength];
Array.Copy(dataShards[i], 0, temp, 0, dataLength);
allShards[i] = temp;
}
for (int i = dataCount; i < totalCount; i++)
{
allShards[i] = new byte [dataLength];
}
// Encode.
ReedSolomon codec = ReedSolomon.create(dataCount, parityCount);
codec.encodeParity(allShards, 0, dataLength);
// Make a copy to decode with.
byte [] [] testShards = new byte [totalCount] [];
bool [] shardPresent = new bool [totalCount];
for (int i = 0; i < totalCount; i++)
{
byte[] temp = new byte[shardLength];
Array.Copy(allShards[i], 0, temp, 0, shardLength);
testShards[i] = temp;
shardPresent[i] = true;
}
// Decode with 0, 1, ..., 5 shards missing.
for (int numberMissing = 0; numberMissing < parityCount + 1; numberMissing++)
{
tryAllSubsetsMissing(codec, allShards, testShards, shardPresent, numberMissing);
}
}
