**What**
I have created a new method on the cart service which is `addLineItems`, allowing a user to add one or multiple items in an optimized way. Also updated the `generate` method from the line item service which now also accept a object data or a collection of data which. Various places have been optimized and cache support has been added to the price selection strategy.
The overall optimization allows to reach another 9000% improvement in the response time as a median (Creating a cart with 6 items):
| | Min (ms) | Median (ms) | Max (ms) | Median Improvement (%)
|---|:-:|---|---|---|
| Before optimisation | 1200 | 9999 | 12698 | N/A
| After optimisation | 63 | 252 | 500 | 39x
| After re optimisation | 56 | 82 | 399 | 121x
| After including addressed feedback | 65 | 202 | 495 | 49x
FIXES CORE-722
What
Allow to create a cart with a sales channel, otherwise the default one is attached.
Also allow to update the sales channel on an existing cart and in that case the line items that does not belongs to the new sales channel attached are removed
How
Updating existing end points and service method to integrate the new requirements
Tests
Add new integration tests
Fixes CORE-270
Fixes CORE-272
Co-authored-by: Oliver Windall Juhl <59018053+olivermrbl@users.noreply.github.com>
