Raven.Storage.Managed.TransactionStorageActions.AddDocumentInTransaction C# (CSharp) Method

		public Guid AddDocumentInTransaction(string key, Guid? etag, RavenJObject data, RavenJObject metadata, TransactionInformation transactionInformation)
		{
			var readResult = storage.Documents.Read(new RavenJObject {{"key", key}});
			if (readResult != null) // update
			{
				StorageHelper.AssertNotModifiedByAnotherTransaction(storage, this, key, readResult, transactionInformation);
				AssertValidEtag(key, readResult, storage.DocumentsModifiedByTransactions.Read(new RavenJObject { { "key", key } }), etag);

				((RavenJObject)readResult.Key)["txId"] = transactionInformation.Id.ToByteArray();
				if (storage.Documents.UpdateKey(readResult.Key) == false)
					throw new ConcurrencyException("PUT attempted on document '" + key +
												   "' that is currently being modified by another transaction");
			}
			else
			{
				readResult = storage.DocumentsModifiedByTransactions.Read(new RavenJObject { { "key", key } });
				StorageHelper.AssertNotModifiedByAnotherTransaction(storage, this, key, readResult, transactionInformation);
			}

			storage.Transactions.UpdateKey(new RavenJObject
			                               	{
			                               		{"txId", transactionInformation.Id.ToByteArray()},
			                               		{"timeout", SystemTime.UtcNow.Add(transactionInformation.Timeout)}
			                               	});

			var ms = new MemoryStream();

			metadata.WriteTo(ms);
			var dataBytes = documentCodecs.Aggregate(data.ToBytes(), (bytes, codec) => codec.Encode(key, data, metadata, bytes));
			ms.Write(dataBytes, 0, dataBytes.Length);

			var newEtag = generator.CreateSequentialUuid();
			storage.DocumentsModifiedByTransactions.Put(new RavenJObject
			                                            	{
			                                            		{"key", key},
			                                            		{"etag", newEtag.ToByteArray()},
			                                            		{"modified", SystemTime.UtcNow},
			                                            		{"txId", transactionInformation.Id.ToByteArray()}
			                                            	}, ms.ToArray());

			return newEtag;
		}