/// <summary>
/// Get the details of a blob from a specified id. Returns 'Null' if the
/// data isn't available.
/// </summary>
public Meta Get(string id)
{
// check the cache
var meta = _cache.Get(id);
// was the metadata retrieved from the cache?
if (meta == null)
{
// no, get the row
var row = Select(Length, SectionCount, SectionLength)
.Where(Id).EqualTo(id)
.First();
// was the row retrieved? no, return null
if (row == null)
{
return(null);
}
// return a completed blob specification
meta = new Meta(row.A, row.B, row.C);
}
// return the metadata retrieved or existing in the cache
return(_cache.AddOrGet(id, meta));
}
public async Task Intercept_throwsMessageExecutionExceptionFromCache()
{
await Cache.AddOrGet(Message.GetSha1(), _ => new CachingExceptionResult(new TestMessageExecutionException()));
await Interceptor.Awaiting(x => x.Intercept(Fail(new ArgumentException()), Message))
.Should().ThrowAsync <TestMessageExecutionException>();
}
/// <summary>
/// Get a blob data row by id and index.
/// </summary>
public byte[] Get(string id, int index)
{
var cacheId = new Struct <string, int>(id, index);
// get from the cache
var data = _cache.Get(cacheId);
// was the data retrieved from the cache?
if (data == null)
{
// no, get the row from the table
data = Select(Bytes)
.Where(Id).EqualTo(id)
.Where(SectionIndex).EqualTo(index)
.First().A;
// were the bytes found? no, return null
if (data == null)
{
return(null);
}
}
// add the retrieved data to the cache
return(_cache.AddOrGet(cacheId, data));
}
