[ http://issues.apache.org/jira/browse/DERBY-1471?page=comments#action_12455158 ]
Tomohito Nakayama commented on DERBY-1471:
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Thank you for your attention :)
The answer is Optional.
Layer B Streaming is optional and used only when lengthless methods were used under configuration
of no encryption.
Those lengthless method were introduced in JDBC4.
// Spec of DRDA told that segmented object must be combined and decrypted as a single object
for Encrypted Object DSS.
// Then I think there are less benefit to using Layer B streaming in the encrypted case.
Furthermore, Layer B streaming does not use length information for whole LOB ,
however it does use length information for each DSS segment.
I read next parts as where relate :
org.apache.derby.client.net.Request#finalizeDssLength()
org.apache.derby.impl.drda.DDMReader#readDssHeader ()
> Implement layer B streaming for new methods defined in JDBC4.0
> --------------------------------------------------------------
>
> Key: DERBY-1471
> URL: http://issues.apache.org/jira/browse/DERBY-1471
> Project: Derby
> Issue Type: New Feature
> Components: Network Client
> Reporter: Tomohito Nakayama
> Assigned To: Tomohito Nakayama
> Attachments: DERBY-1471.diff, DERBY-1471.patch, DERBY-1471.stat, DERBY-1471_2.patch,
DERBY-1471_2.stat
>
>
> JDBC 4.0 introduced new methods which take parameters for object to be sent to sever
without length information.
> For those methods, Layer B streaming is best way to implement sending object to server.
> This issue is representation of DERBY-1417 in Network Client.
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