Message flow between advanced adapter engine and messaging system for ICO scenarios

Dear all,
I'm working on a PI 7.31 AEX box and created an ICO object for one interface with HTTP_AAE2IDoc scenario. The interface works quite well. When I looked in to message log of messages for this interface in PI monitor, I noticed that the internal XI message are put totally 5 times into the send queue and retrieved from send queue. In some steps I only see after retrieving a message from send queue and immediately put it back into send queue. Can someone please kindly explain the message flow between advanced adapter engine and messaging system and what exactly happens after each retrieving a message from send queue?
Below is an example of message log for one message:
12/08/2014 09:26:06.472    Information    MP: processing local module localejbs/CallSapAdapter
12/08/2014 09:26:06.472    Information    Application attempting to send an XI message asynchronously using connection HTTP_AAE_http://sap.com/xi/XI/System
12/08/2014 09:26:06.478    Information    Trying to put the message into the send queue
12/08/2014 09:26:06.499    Information    Message successfully put into the queue
12/08/2014 09:26:06.499    Information    The message was successfully retrieved from the send queue
12/08/2014 09:26:06.499    Information    The application sent the message asynchronously using connection HTTP_AAE_http://sap.com/xi/XI/System. Returning to application
12/08/2014 09:26:06.500    Information    HTTP adapter successfully processed interface PlantResponse_Out
12/08/2014 09:26:06.501    Information    Trying to put the message into the send queue
12/08/2014 09:26:06.501    Information    Message status set to DLNG
12/08/2014 09:26:06.513    Information    Message successfully put into the queue
12/08/2014 09:26:06.513    Information    The message was successfully retrieved from the send queue
12/08/2014 09:26:06.515    Information    Message status set to DLNG
12/08/2014 09:26:06.533    Information    Trying to put the message into the send queue
12/08/2014 09:26:06.548    Information    Message successfully put into the queue
12/08/2014 09:26:06.548    Information    The message was successfully retrieved from the send queue
12/08/2014 09:26:06.550    Information    Message status set to DLNG
12/08/2014 09:26:06.551    Information    Executing Request Mapping "http://styrolution.com/pi/Integration/PlantMaintenance/PlantResponse/PlantResponse_to_Zcol_Basf_Inotif02_Inotif01_Zeupm_Inotif01_Ludwigshafen" (SWCV 085d2320fb3b11e2cc0bf4d50aea8c33)
12/08/2014 09:26:06.563    Information    Trying to put the message into the send queue
12/08/2014 09:26:06.571    Information    Message successfully put into the queue
12/08/2014 09:26:06.571    Information    The message was successfully retrieved from the send queue
12/08/2014 09:26:06.573    Information    Trying to put the message into the send queue
12/08/2014 09:26:06.573    Information    Message status set to DLNG
12/08/2014 09:26:06.580    Information    Message successfully put into the queue
12/08/2014 09:26:06.580    Information    The message was successfully retrieved from the send queue
12/08/2014 09:26:06.582    Information    Message status set to DLNG
12/08/2014 09:26:06.583    Information    Delivering to channel: IDOC_R
12/08/2014 09:26:06.583    Information    MP: processing local module localejbs/IDocOutboundModuleBean
12/08/2014 09:26:06.583    Information    XI message received for processing
12/08/2014 09:26:06.587    Information    Sender Party: Sender Service:SXX Receiver Party: Receiver Service:RXXCLNT200 Communication Channel:IDOC_R
12/08/2014 09:26:06.588    Information    IDOC metadata repository is RXX
12/08/2014 09:26:06.589    Information    Control record is not mandatory - control record will be added if not available
12/08/2014 09:26:06.590    Information    XML Payload parsed to idoc document list with number of idocs: 1
12/08/2014 09:26:06.595    Information    Sending idoc message to receiver R/3 system with TID XIh{lsRI824UITC0009OalmW
12/08/2014 09:26:06.813    Information    IDOC message sent to receiver R/3 system
12/08/2014 09:26:06.817    Information    TID XIh{lsRI824UITC0009OalmW confirmed
12/08/2014 09:26:06.819    Information    Message was successfully transmitted to endpoint <local> using connection HTTP_AAE_http://sap.com/xi/XI/System
12/08/2014 09:26:06.821    Information    Message status set to DLVD
Thanks & regards
Dingjun

Hello All,
Thanks for the prompt responses and with best information, But apart from this,I need how an adapter(File/JDBC) works along
with AAE in PI 7.1. When does the job of File/JDBC adapter is completed and resumed in a synchronous case. That is,
File Location --> file adapter -
> XI(AAE) --> JDBC adapter --> database.
In file sender, lets suppose we have synchronous settings(Best Effort). Now when File adapter's job is finished and when it
gets back the response back from XI. Please explain step by step from starting(file adapter polling the location) to getting the response coming back to XI.
Regards,
Achari.

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>>>1) Suppose if I have 50,000 transaction records in one file Will all go to one queue for processing or many queue processing for processing . if it is many, is it configurable?
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when i send a http request it got stuck in adapter engine with status "delivering" for some time....
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Webinar:SAP NetWeaver Process Integration u2013 Advanced Adapter Engine in PI 7

+Please Note: This webinar is aimed at consultants, Patners and Customers in APJ Region and is scheduled at 2.00 - 3.00 p.m. Singapore Time (UTC +8)+
Dear valued SAP Experts,
Next SAP Intelligence Platform & NetWeaver RIG Expert Call Session will take place on Tuesday, September 1. The SAP Intelligence Platform & NetWeaver RIG Expert Call Sessions are designed to support consultants, partners and customers during their implementation projects. The sessions cover all different aspects of SAP NetWeaver and are aimed at experts, thus provide knowledge which is not available via standard training courses. The session duration is typically 60min and includes questions and answers.
Tuesday, September 1, 2009:
SAP NetWeaver Process Integration u2013 Advanced Adapter Engine in PI 7.1 EHP1
Time: 2.00 - 3.00 p.m. Singapore Time (UTC +8)
This event will feature Charu Goel with the SAP Intelligence Platform & NetWeaver Regional Implementation Group. Charu provides the following abstract:
With PI 7.1 Enhancement pack 1, we continuously thrive to bring in advancements in AAE. In this APJ expert call, we talk about the much awaited capability of IDOC packaging along with the enhancements in JMS. You will learn about the interaction between the AAE and ABAP stack, new enhancements on the JDBC adapter and overall improvements in the technical adapters available with PI 7.1 EHP1.
For meeting and Dial-in detail please register [here|http://www.surveymonkey.com/s.aspx?sm=qkBfQCM5FM_2f_2b4O0ihVpFRw_3d_3d]
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