Instant transfer

(1) What is instant transfer?

Instant transfer is the function that allows you to send a file only by specifying the names of the target file and the receiving-side host without using pre-registered management information.

Figure 2.31 Overview of instant transfer

To perform an instant transfer, the following needs to be performed in advance on the receiving-side host:

• Specify the request acceptance setting for instant transfer in the Host Information (if the sending-side host is registered) or in the System Environment Settings (if not registered).

• Specify, in a file, names of libraries under which instant transfer requests are accepted.

For details, refer to the description in the following sections.

(2) Functionality available in instant transfer

With instant transfer, the operation of transferring a file is very simple because it does not use management information settings. As a compromise, it requires some restrictions on the functionality. The table below describes the points to note about which part of the functionality is limited in instant transfer.

(3) How to execute instant transfer

To perform an instant transfer, execute the Instant Transfer Send File Issuance command on the sending-side host.

(4) Behavior when sending-side transferring is performed

(5) Behavior when receiving-side transferring is performed

In receiving-side transferring for instant transfer, because HULFT does not reference to management information, it always operates with the same settings.

Except for those parameters modified when issuing the Instant Transfer Send File request, the behavior of an instant transfer is the same as that obtained when the following values are specified in the Send Management Information and the Host Information:

(6) Receive file

In instant transfer, you can specify information about the receive file in the System Environment Settings or as parameters specified when the Instant Transfer Send File request is issued.

For details on parameters specified when issuing the Instant Transfer Send File request, refer to Operation Manual.

(7) Specifying library names under which file can be received

In instant transfer, because both the save destination and the name of the receive file can be specified, the following possibilities exist.

• Important files might be overwritten on the receiving-side host.

• The specified save destination or name of the receive file might deviate from operational rules used in the business.

To avoid such a situation when you perform instant transfer, specify lists of library names under which files can be received on the receiving-side host in advance.

The request for receiving-side transferring is accepted only when the save destination for the receive file specified on the sending-side host matches one of the library names registered in the list stored in the libraries file.

The library names under which files can be received in instant transfer is defined in a file called "instant transfer receive libraries file".

The default library used when the save destination for the receive file is omitted on the sending-side host is also specified in the instant transfer receive libraries file.

If the instant transfer receive libraries file does not exist or reading the file fails, requests for receiving-side transferring in instant transfer are rejected.

* 
* INSTANT TRANSFER ALLOW LIBRARY 
* 

* DEFAULT LIBRARY 
DEFAULTLIB=default library name 

* ALLOW LIBRARY 
_LIST_START_ 
library name1 library name2 
  : 
_LIST_END_

* 
* INSTANT TRANSFER ALLOW LIBRARY 
* 

* DEFAULT LIBRARY 
DEFAULTLIB=INSTTRANS 

* ALLOW LIBRARY 
_LIST_START_ 
ABC 
DEF* 
*OPQ 
_LIST_END_

(8) Code Conversion

In instant transfer, information about code conversion is specified in the following fields in the System Environment Settings.

The value notified by the destination host is used as information about the code set specified on the destination host.

For notes on code conversion and details on how it behaves, refer to Code Conversion Manual.

(9) Observe Setting function in instant transfer

In instant transfer, you can attempt to send a file only by specifying the host name and the port number of the receiving-side host.

On the other hand, you can enable the receiving-side host to refuse to receive unexpected files on the receiving-side host.

Figure 2.32 Request acceptance settings for instant transfer

(10) Points to be noted on instant transfer

The following are the points to be noted when using instant transfer:

• For file transfers executed by issuing Instant Transfer Send File, HULFT automatically assign the file ID "_INSTANT_TRANSFER_".
  You can execute neither of the following by specifying this file ID:

  • Issuing Send File

  • Issuing Resend File

  • Issuing Send Request

  • Issuing Resend Request

  • Registering records to the Send Management Information

  • Registering records to the Receive Management Information

  On the other hand, for transfer status or log for which the file ID "_INSTANT_TRANSFER_" is assigned, you can perform any of the following operations in the same way as in regular transfer:

  • Inquiring and deleting records from the Send Log

  • Inquiring and deleting records from the Receive Log

  • Canceling sending-side transferring instances

  • Canceling receiving-side transferring instances

  • Modifying the Unsent Status Queue

• Even when Dynamic Parameter Specification (DYNPARAM) is set to "0" (Cannot change dynamically) in the System Environment Settings, the send file name and the receiving-side host name can be specified as parameters for the Instant Transfer Send File Issuance command.

• For details on errors from the Instant Transfer Send File Issuance command, and status codes and detail codes in the transfer status or log of instant transfers, refer to Error Codes and Messages.

• The level of security differs as follows between regular transfer, which uses management information, and instant transfer:

  Table 2.11 Security on the sending-side host

  	Regular transfer using management information	Instant transfer
  File ID	Sending-side transferring is performed only when the same ID is registered on the receiving-side host	Sending-side transferring is performed regardless of whether the ID is registered in the Send Management Information
  Host name	Sending-side transferring is performed only when the destination host is registered in the Host Information	Sending-side transferring is performed against any arbitrary destination host
  Multiplicity by host	The value set in the Host Information is applied and multiple sending-side transferring instances can run up to the multiplicity of the value	No limit on multiplicity of transferring instances can be set
  Multiplicity in the entire system	The value set in the System Environment Settings is applied and multiple sending-side transferring instances can run up to the multiplicity of the value	The value set in the System Environment Settings is applied and multiple sending-side transferring instances can run up to the multiplicity of the value

  Table 2.12 Security on the receiving-side host

  	Regular transfer using management information	Instant transfer
  File ID	Receiving-side transferring is performed only when the same ID is registered on the sending-side host	Receiving-side transferring is performed regardless of whether the ID is registered in the Send Management Information
  Host name	Receiving-side transferring is performed only when the sending-side host is registered in the Host Information	Receiving-side transferring is performed only when the sending-side host is allowed to send files in the Host Information (or against any arbitrary host if set so) (*1)
  Save destination for the receive file	Receive files can be stored only in the file name specified in the Receive Management Information	Receive files can be stored only to libraries specified in the instant transfer receive libraries file
  Receive file name		Receiving-side transferring is performed in any arbitrary destination file name
  Multiplicity in the entire system	The value set in the System Environment Settings is applied and multiple sending-side transferring instances can run up to the multiplicity of the value	The value set in the System Environment Settings is applied and multiple sending-side transferring instances can run up to the multiplicity of the value

  *1

  :

  By default, an arbitrary host is not allowed.

   

  When you use the instant transfer function, please take note of the above and specify appropriate settings in the Host Information and in the instant transfer receive libraries file.