Export (0) Print
Expand All

4.2.1 RequestVersionVector

The client may engage in a sequence of calls.

The following table shows the call RequestVersionVector with arguments.

sequenceNumber

23

requestType

REQUEST_NORMAL_SYNC

changeType

CHANGE_ALL

vvGeneration

0

The server then responds with a callback to AsyncPoll, where the return parameter of AsyncPoll is populated.

sequenceNumber

23

status

status

vvResponse

 

To obtain the next server version vector, the client may then call the following.

sequenceNumber

103

Fresh sequence number

requestType

REQUEST_NORMAL_SYNC

 

changeType

CHANGE_ALL

 

vvGeneration

45

The generation returned by the previous call

Note that the client uses the value of vvGeneration returned by the server to ensure that the server does not immediately invoke the AsyncPoll callback with the same version chain vector, but waits until the server has made a change to its version chain vector that supersedes the version chain vector returned in the first response.

 
Show:
© 2015 Microsoft