private Guid?AssertValidEtag(string key, Guid?etag, string op, TransactionInformation transactionInformation)
{
var readResult = storage.Documents.Read(new RavenJObject {
{ "key", key }
});
if (readResult != null)
{
StorageHelper.AssertNotModifiedByAnotherTransaction(storage, transactionStorageActions, key, readResult, transactionInformation);
var existingEtag = new Guid(readResult.Key.Value <byte[]>("etag"));
if (etag != null)
{
if (existingEtag != etag)
{
if (etag.Value == Guid.Empty)
{
RavenJObject metadata;
ReadMetadata(key, existingEtag, readResult.Data, out metadata);
if (metadata.ContainsKey(Constants.RavenDeleteMarker) && metadata.Value <bool>(Constants.RavenDeleteMarker))
{
return(existingEtag);
}
}
throw new ConcurrencyException(op + " attempted on document '" + key +
"' using a non current etag")
{
ActualETag = etag.Value,
ExpectedETag = existingEtag,
Key = key
};
}
}
return(existingEtag);
}
if (etag != null && etag != Guid.Empty) // expected something to be there.
{
throw new ConcurrencyException("PUT attempted on document '" + key +
"' using a non current etag (document deleted)")
{
ExpectedETag = etag.Value,
Key = key
}
}
;
readResult = storage.DocumentsModifiedByTransactions.Read(new RavenJObject {
{ "key", key }
});
StorageHelper.AssertNotModifiedByAnotherTransaction(storage, transactionStorageActions, key, readResult, transactionInformation);
if (readResult == null)
{
return(null);
}
return(new Guid(readResult.Key.Value <byte[]>("etag")));
}
}