OpenTP1 Version 7 TP1/Client User's Guide TP1/Client/J
2.12.2 Notes about using the data compression facility
This subsection provides notes about using the data compression facility.
- If an RPC using the scheduler direct facility is issued and the TP1/Server version at the service request destination is earlier than 03-03, invalid data may be passed to SPP's service function. In such a case, do not issue to TP1/Server a service request that uses the data compression facility (specify N in the dccltdatacomp operand).
If an RPC using the name service facility is issued and the TP1/Server version at the service request destination is earlier than 03-03, the data compression facility cannot be used even when it is set to be used, because this setting is ignored.
- If the size of the data obtained after compression would be greater than the size of the data before compression, or if the TP1/Server at the service request destination does not support the data compression facility, a message indicating that the data was not compressed is output to the error trace file of TP1/Client/J, and processing continues. In such a case, the data has not been compressed.
- The data compression facility cannot be used when you establish a permanent connection with a DCCM3 logical terminal and then issue a service request.
- If the rpcCall method returns an error, the service's response (out_data) is not guaranteed.
- The maximum length of an RPC message (maximum length of a user message that can be sent or received by the rpcCall method) is always the value set in the dccltrpcmaxmsgsize operand or the default value (1 megabyte), regardless of whether or not the data compression facility is used.
- If the XA transaction linkage facility is used from uCosminexus TP1 Connector or Cosminexus TP1 Connector, and if the version of the target TP1/Server is 07-00 or earlier, TP1/Client/J cannot use the data compression facility. If an attempt is made to use the data compression facility in such a case, the KFCA32042-W message may be output.
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