internal InternalOperation(IChainTable target, TableOperation op, TableRequestOptions options = null, OperationContext context = null)
{
this.target = target;
this.op = op;
this.options = options;
this.context = context;
}
// execute batch write on a same partition of a same underlying table
// on succeed, res is filled with exact number of table results, and return -1
// otherwise, res only contain a single table result of error, and return the error index
internal static int BatchWrite(IChainTable table, List <Tuple <TableOperationType, ITableEntity, string> > ops, out IList <TableResult> res,
TableRequestOptions options = null, OperationContext context = null)
{
TableBatchOperation batch = new TableBatchOperation();
foreach (var op in ops)
{
Assert.IsTrue(op.Item1 == TableOperationType.Insert || op.Item3 != null);
if (op.Item3 != null)
{
op.Item2.ETag = op.Item3;
}
batch.Add(TranslateWriteOp(op.Item1, op.Item2));
}
try
{
res = table.ExecuteBatch(batch);
return(-1);
}
catch (ChainTableBatchException e)
{
res = new List <TableResult>();
res.Add(new TableResult()
{
Result = null, Etag = e.RequestInformation.Etag, HttpStatusCode = e.RequestInformation.HttpStatusCode
});
return(e.FailedOpIndex);
}
}
/*
* ReadModifyWriteRow
* Execute a conditional write operation on a row.
*
* Insert - Success if currently no row exists on the key.
* Update & Merge - success only if current row exists and etag matches.
* Delete - Success only if current row exist, and etag matches.
*
* param:
* table - target table.
* opType - operation to execute, Insert / Replace / Merge / Delete.
* row - target row to insert / delete, also serves as the parameter used for insert / replace / merge.
* etag - for replace / merge / delete, provide the etag of target row.
*
* return:
* The result of query. Return null if the Azure request throws an unknown exception.
*/
internal static TableResult ModifyRow(IChainTable table, TableOperationType opType, ITableEntity row, string eTag,
TableRequestOptions requestOptions = null, OperationContext operationContext = null)
{
Assert.IsTrue(opType == TableOperationType.Insert || eTag != null);
if (eTag != null)
{
row.ETag = eTag;
}
return(WriteConditionalRow(table, opType, row, requestOptions, operationContext));
}
private static TableResult WriteConditionalRow(IChainTable table, TableOperationType opType, ITableEntity row,
TableRequestOptions options = null, OperationContext oc = null)
{
try
{
TableOperation top = TranslateWriteOp(opType, row);
return(table.Execute(top, options, oc));
}
catch (StorageException e)
{
return(new TableResult()
{
Result = null, Etag = e.RequestInformation.Etag, HttpStatusCode = e.RequestInformation.HttpStatusCode
});
}
catch (Exception e)
{
Console.WriteLine("TryWriteConditionalRow:Error: exception {0}", e);
return(null);
}
}
// Single-op API: execute a single operation on an underlying table
/*
* RetrieveRow
* Read a row.
*
* param:
* A retrieve operation
* (Currently do not support partitionID + rowID, since Operation has another important information, i.e., deserializer)
*
* return:
* query result.
*/
internal static TableResult RetrieveRow(IChainTable table, TableOperation operation, TableRequestOptions requestOptions = null,
OperationContext operationContext = null)
{
TableResult retrievedResult = null;
try
{
retrievedResult = table.Execute(operation, requestOptions, operationContext);
}
catch (StorageException e)
{
return(new TableResult()
{
Result = null, Etag = e.RequestInformation.Etag, HttpStatusCode = e.RequestInformation.HttpStatusCode
});
}
catch (Exception e)
{
Console.WriteLine("Error in Retrieve: caught exception {0}", e);
return(null);
}
return(retrievedResult);
}
internal static TableResult RetrieveRowThrow(IChainTable table, TableOperation operation, TableRequestOptions requestOptions = null,
OperationContext operationContext = null)
{
return(table.Execute(operation, requestOptions, operationContext));
}