Ken Unnai, SAP Technology RIG April 23rd, 2015

brought to you by the SAP Technology RIG

Ken Unnai, SAP Technology RIG

April 23rd, 2015

SAP Mobile – Webinar

Building the Best OData Services for Offline Scenario

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Legal disclaimer


Getting Ready with Offline Store – H2G

#1 - OData CRUD Crash Course

#2 - How To Implement $skiptoken

#3 - How To Implement Lightening Fast OData

Services with Exchange Table

#4 - How To Use Delta Query and

Server Side Paging with Soft State

http://scn.sap.com/docs/DOC-49861


Theory

Implementation

Demo

Getting Ready with Offline Store


Demo with offline & online

︎ ###

Theory

︎00:00 |

##:##

OData Services for Offline Store

Theory


Offline

Store

HCPms

---------------------

SMP

MobiLink Odata

Service Odata

Service OData

Service

Landscape


Offline

Store

HCPms

---------------------

SMP

MobiLink Odata

Service Odata

Service OData

Service

Problem with Offline Store Performance

Problem: Your app with offline store has some performance issue with large

volume of data. The initial creation of the store and the refresh time takes

longer than you had expected.


Offline

Store

HCPms

---------------------

SMP

MobiLink Odata

Service Odata

Service OData

Service

Solution

Server Side Paging

+

Delta Tracking/Query


What is Server Side Paging?

Split table data with $skiptoken

<link rel="next" href="TheBigCollection?$skiptoken=2000"/>


What is Delta Tracking & Delta Query?

Delta data with deltatoken

Tracking = Maintain the delta data during CUD operations

Query = Fetch the delta data via Query operation

<link rel="delta" href=”TheBigCollection?!deltatoken='20150414060630%20'"/>


Offline

Store

HCPms

---------------------

SMP

MobiLink Odata

Service Odata

Service OData

Service

Solution

*SAP Gateway

+

**Syclo xChange

Framework

*SAP Gateway 2.0, SP09+ (IW_BEP 200 SP09)

**Syclo Agentry SAP Framework Integration Foundation (SMFND 600_700)

(Requires minimum SAP NetWeaver 7.00, BASIS SP14)



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Theory


Implementation

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Implementing Server Side Paging

In an OData Query operation…

skiptoken = io_tech_request_context->get_skiptoken( ).

es_response_context-skiptoken = next_skiptoken.

1. Get the $skiptoken value in the URL

3. Set the $skiptoken value AND a cropped table

2. Do the table size calculation to crop one page


Implementing Delta Tracking

In OData Create/Update/Delete operations…

0. (Create an “Exchange Table”)

1. Capture the data change during the CUD events and

update the Exchange Table

Note: Exchange Table keeps track of “minimum” data – such as key value.


Implementing Delta Tracking

action = /syclo/cl_core_constants=>exch_action_insert.

objkey = key_value.

action = /syclo/cl_core_constants=>exch_action_update.

objkey = key_value.

action = /syclo/cl_core_constants=>exch_action_delete.

objkey = key_value.

/syclo/cl_core_exch_serv=>update_exchange( EXPORTING

iv_objkey = objkey

iv_efi_include = efi_incl_name

iv_action = action

it_data = efi_data ).

Create

Update

Delete

..and Update

Exchange Table

Enhancement

Framework

Implementation


Implementing Delta Query

In an OData (Delta) Query operation…

delta_token = lo_delta_context->get_deltatoken( ).

CALL METHOD /smfnd/cl_core_exobj_tools=>determine_delta_objkeys

EXPORTING

iv_mobile_app = ’MY_MOBILE_CONFIG’

iv_exchobj = ’MY_EXCHANGE_OBJECT’

iv_time_token = delta_token

iv_time_zone = 'UTC’

IMPORTING

eref_exch_data = delta_table.


Using $skiptoken AND deltatoken altogether

+


$skiptoken AND deltatoken by Soft State

1 2 3

Obtain Keep Split

Soft State is a new feature of SAP Gateway SP9.

Essentially it is “Stateful” session – which allows us to persist data in a user

specific session.

Soft State Soft State


Obtain

1 2 3

Obtain the entire table content & a deltatoken

as a snapshot


Keep

1 2 3

Keep the table data & deltatoken

in the soft state session

until the deltatoken is sent

Soft State


Split

1 2 3

Split the table data with $skiptoken,

the last chunk contains deltatoken

Soft State


Update & Delete Operation with Etag

Offline

Store

Etag: etagA

1


Entity Data Changed in OData Provider

Offline

Store

Etag: etagA

2 HCPms

---------------------

SMP

Odata

Service Odata

Service OData

Service


Etag Updated via Refresh

Offline

Store

Etag: etagB

3 Refresh


Adding Offline Store Queue - FAILS

Offline

Store 4

Queue

Update & Delete locally - Fails


HCPms

---------------------

SMP

Odata

Service Odata

Service OData

Service

What If the Refresh Didn’t Happen?

Queue

X

Updated & Deleted locally

Flush Offline

Store


Offline

Store

Odata

Service Odata

Service OData

Service

Error during Flush Response

offlineStoreRequestFailed

HCPms

-------------------

SMP

X



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D E M O


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developments, products, and/or platform directions and functionality are all subject to change and may be changed by SAP SE or its affiliated companies at any time

for any reason without notice. The information in this document is not a commitment, promise, or legal obligation to deliver any material, code, or functionality. All forward-

looking statements are subject to various risks and uncertainties that could cause actual results to differ materially from expectations. Readers are cautioned not to place

undue reliance on these forward-looking statements, which speak only as of their dates, and they should not be relied upon in making purchasing decisions.

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Ken Unnai, SAP Technology RIG April 23rd, 2015

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