Asynchronous Actions

By default, HPE IDOL Server processes all actions synchronously. In this case, HPE IDOL Server does not respond to the action until it has completed the request. The result of the action is in the response to the request.

With additional configuration, you can also process query actions asynchronously. In this case, HPE IDOL Server responds to the action immediately. The request is added to a queue of actions. The response to the request contains a token. You can use this token to determine whether the request has finished, and obtain the results of the action. To do this, use the QueueInfo action.

You might want to use asynchronous actions to run operations that take a long time, and that do not require an immediate response. For example, you might have synchronous queries to return results to users, and then use an asynchronous action to run a query summary.

Configure Asynchronous Actions

You must configure HPE IDOL Server to allow asynchronous actions.

For example:

[Actions]
Async=AsyncActions 

[AsyncActions] 
Threads=2

Send Asynchronous Actions

To send an asynchronous action, you use the same action syntax as normal, but add the Synchronous parameter, set to False.

You can send the following actions asynchronously:

DetectLanguage GetTagValues Summarize
DocumentStats Highlight TermExpand
GetAllRefs List TermGetAll
GetContent Query TermGetBest
GetQueryTagValues Suggest TermGetInfo
GetTagNames SuggestOnText  

Retrieve Results for Asynchronous Actions

The QueueInfo action allows you to retrieve the status and results of asynchronous actions.

To return the results of all asynchronous actions, send a QueueInfo action, with the QueueName parameter set to Async, and the QueueAction parameter set to GetStatus. You can set the Token parameter to the token for a specific action to retrieve results for only that action.

NOTE:

If you do not specify the Token parameter, all results for the server return. HPE does not recommend that you return all results for a server that has been running for a long time, because the response might time out.

NOTE:

There are no user restrictions for viewing the queue list, so all users can see all results that the original action returns. HPE does not recommend that you use asynchronous actions if you have strict document security requirements.

TIP:

You can use the QueueInfo action to return information about the queue, and to cancel or change the priority of actions. For more information, refer to the IDOL Server Reference.

You can use the Asynchronous Queues page in the Monitor section of IDOL Admin to view details of the asynchronous actions that the server is processing, view the results of those actions, and cancel actions. For more information, refer to the IDOL Admin User Guide.


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