/// <summary>
/// Supports reading a named stream from the persistent store via the grid cache
/// </summary>
public FileSystemErrorStatus ReadStreamFromPersistentStore(Guid dataModelId, string streamName, FileSystemStreamType streamType, out MemoryStream stream)
{
stream = null;
try
{
var cacheKey = ComputeNamedStreamCacheKey(dataModelId, streamName);
//Log.LogInformation($"Getting key:{cacheKey}");
try
{
using var ms = new MemoryStream(NonSpatialCache(streamType).Get(cacheKey).Bytes);
stream = MemoryStreamCompression.Decompress(ms);
stream.Position = 0;
}
catch (KeyNotFoundException)
{
return(FileSystemErrorStatus.GranuleDoesNotExist);
}
return(FileSystemErrorStatus.OK);
}
catch (Exception e)
{
_log.LogError(e, "Exception occurred:");
stream = null;
return(FileSystemErrorStatus.UnknownErrorReadingFromFS);
}
}
public void CompressTest()
{
byte[] someBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 };
MemoryStream ms = new MemoryStream(someBytes);
MemoryStream result = MemoryStreamCompression.Decompress(MemoryStreamCompression.Compress(ms));
Assert.True(result.ToArray().SequenceEqual(someBytes), "Bytes are not the same after compression/decompression cycle");
}
/// <summary>
/// Supports reading a stream of spatial data from the persistent store via the grid cache
/// </summary>
public FileSystemErrorStatus ReadSpatialStreamFromPersistentStore(Guid dataModelId,
string streamName,
int subGridX, int subGridY,
long segmentStartDateTicks,
long segmentEndDateTicks,
long version,
FileSystemStreamType streamType,
out MemoryStream stream)
{
stream = null;
try
{
var cacheKey = new SubGridSpatialAffinityKey(version, dataModelId, subGridX, subGridY, segmentStartDateTicks, segmentEndDateTicks);
//Log.LogInformation($"Getting key:{streamName}");
try
{
using var ms = new MemoryStream(SpatialCache(streamType).Get(cacheKey).Bytes);
stream = MemoryStreamCompression.Decompress(ms);
stream.Position = 0;
}
catch (KeyNotFoundException)
{
return(FileSystemErrorStatus.GranuleDoesNotExist);
}
return(FileSystemErrorStatus.OK);
}
catch (Exception e)
{
_log.LogError(e, "Exception occurred:");
stream = null;
return(FileSystemErrorStatus.UnknownErrorReadingFromFS);
}
}
public void DeCompressTest()
{
Assert.Null(MemoryStreamCompression.Decompress(null));
}