add projector and projectionist

[DavidBadura]

This is a proof of concept for ticket #295

[github-actions[bot]]

Hello :wave:

here is the most recent benchmark result:

LoadEventsBench
===============

Average iteration times by variant

110.9ms   │ ██ 
97.0ms    │ ██ 
83.2ms    │ ██ 
69.3ms    │ ██ 
55.4ms    │ ██ 
41.6ms    │ ██ 
27.7ms    │ ██ 
13.9ms    │ ██ 
          └────
            1  

[█ <current>] [█ base] 

1: benchLoadEvents 

Memory by variant

24.2mb    │ ██ 
21.2mb    │ ██ 
18.2mb    │ ██ 
15.1mb    │ ██ 
12.1mb    │ ██ 
9.1mb     │ ██ 
6.1mb     │ ██ 
3.0mb     │ ██ 
          └────
            1  

[█ <current>] [█ base] 

1: benchLoadEvents 

+--------------------+--------------------+--------------------+-----------------+------------+
|                    | time (kde mode)                         | memory                       |
+--------------------+--------------------+--------------------+-----------------+------------+
| subject            | Tag: <current>     | Tag: base          | Tag: <current>  | Tag: base  |
+--------------------+--------------------+--------------------+-----------------+------------+
| benchLoadEvents () | 110.880ms (±1.54%) | 110.217ms (±0.72%) | 24.205mb        | 24.203mb   |
+--------------------+--------------------+--------------------+-----------------+------------+

LoadEventsWithSnapshotsBench
============================

Average iteration times by variant

296.6μs   │ ██ 
259.5μs   │ ██ 
222.5μs   │ ██ 
185.4μs   │ ██ 
148.3μs   │ ██ 
111.2μs   │ ██ 
74.2μs    │ ██ 
37.1μs    │ ██ 
          └────
            1  

[█ <current>] [█ base] 

1: benchLoadEvents 

Memory by variant

14.6mb    │ ██ 
12.8mb    │ ██ 
11.0mb    │ ██ 
9.1mb     │ ██ 
7.3mb     │ ██ 
5.5mb     │ ██ 
3.7mb     │ ██ 
1.8mb     │ ██ 
          └────
            1  

[█ <current>] [█ base] 

1: benchLoadEvents 

+--------------------+--------------------+--------------------+-----------------+------------+
|                    | time (kde mode)                         | memory                       |
+--------------------+--------------------+--------------------+-----------------+------------+
| subject            | Tag: <current>     | Tag: base          | Tag: <current>  | Tag: base  |
+--------------------+--------------------+--------------------+-----------------+------------+
| benchLoadEvents () | 294.353μs (±0.49%) | 296.605μs (±0.81%) | 14.602mb        | 14.600mb   |
+--------------------+--------------------+--------------------+-----------------+------------+

WriteEventsBench
================

Average iteration times by variant

51.4ms    │    ██ 
45.0ms    │    ██ 
38.5ms    │    ██ 
32.1ms    │    ██ 
25.7ms    │    ██ 
19.3ms    │    ██ 
12.8ms    │    ██ 
6.4ms     │ ▃▃ ██ 
          └───────
            1  2  

[█ <current>] [█ base] 

1: benchSaveOneEvent    2: benchSaveAfterThous᠁ 

Memory by variant

7.4mb     │ ▂▂ ██ 
6.5mb     │ ██ ██ 
5.6mb     │ ██ ██ 
4.7mb     │ ██ ██ 
3.7mb     │ ██ ██ 
2.8mb     │ ██ ██ 
1.9mb     │ ██ ██ 
930.6kb   │ ██ ██ 
          └───────
            1  2  

[█ <current>] [█ base] 

1: benchSaveOneEvent    2: benchSaveAfterThous᠁ 

+---------------------------------+-------------------+-------------------+-----------------+------------+
|                                 | time (kde mode)                       | memory                       |
+---------------------------------+-------------------+-------------------+-----------------+------------+
| subject                         | Tag: <current>    | Tag: base         | Tag: <current>  | Tag: base  |
+---------------------------------+-------------------+-------------------+-----------------+------------+
| benchSaveOneEvent ()            | 1.888ms (±15.04%) | 2.249ms (±10.09%) | 6.723mb         | 6.682mb    |
| benchSaveAfterThousandEvents () | 51.399ms (±0.18%) | 51.182ms (±0.60%) | 7.445mb         | 7.407mb    |
+---------------------------------+-------------------+-------------------+-----------------+------------+

This comment gets update everytime a new commit comes in!

[DavidBadura]

it is on hold and waiting for #317