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chore: add diagram

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sudo pacman -Syu 2023-07-30 12:16:18 +07:00
parent 286d21a723
commit 3ad375308d
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28
docs/2023-07-30-cache-shenanigan.html
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@ -46,6 +46,34 @@
re-write to cache
</li>
</ul>
<div class="highlight highlight-source-mermaid">
<pre><span class="pl-k">sequenceDiagram</span>
<span class="pl-k">participant</span> <span class="pl-ent">other</span>
<span class="pl-k">participant</span> <span class="pl-ent">service</span>
<span class="pl-k">participant</span> <span class="pl-ent">cache</span>
<span class="pl-k">participant</span> <span class="pl-ent">db</span>
<span class="pl-ent">other </span><span class="pl-k">-&gt;&gt;</span> <span class="pl-ent">service</span><span class="pl-k">:</span> <span class="pl-s">get data</span>
<span class="pl-k">activate</span> <span class="pl-ent">service</span>
<span class="pl-ent">service </span><span class="pl-k">-&gt;&gt;</span> <span class="pl-ent">cache</span><span class="pl-k">:</span> <span class="pl-s">get data</span>
<span class="pl-k">alt</span> <span class="pl-s">exist in cache</span>
<span class="pl-ent">service </span><span class="pl-k">--&gt;&gt;</span> <span class="pl-ent">other</span><span class="pl-k">:</span> <span class="pl-s">return data</span>
<span class="pl-k">else</span> <span class="pl-s">not exist in cache</span>
<span class="pl-ent">service </span><span class="pl-k">-&gt;&gt;</span> <span class="pl-ent">db</span><span class="pl-k">:</span> <span class="pl-s">get data</span>
<span class="pl-k">alt</span> <span class="pl-s">exist data in db</span>
<span class="pl-ent">service </span><span class="pl-k">--&gt;&gt;</span> <span class="pl-ent">other</span><span class="pl-k">:</span> <span class="pl-s">return data</span>
<span class="pl-k">else</span> <span class="pl-s">not exist data in db</span>
<span class="pl-ent">service </span><span class="pl-k">--&gt;&gt;</span> <span class="pl-ent">other</span><span class="pl-k">:</span> <span class="pl-s">return error not found</span>
<span class="pl-k">end</span>
<span class="pl-k">end</span>
<span class="pl-k">deactivate</span> <span class="pl-ent">service</span>
<span class="pl-ent">other </span><span class="pl-k">-&gt;&gt;</span> <span class="pl-ent">service</span><span class="pl-k">:</span> <span class="pl-s">set data</span>
<span class="pl-k">activate</span> <span class="pl-ent">service</span>
<span class="pl-ent">service </span><span class="pl-k">-&gt;&gt;</span> <span class="pl-ent">db</span><span class="pl-k">:</span> <span class="pl-s">set data</span>
<span class="pl-ent">service </span><span class="pl-k">-&gt;&gt;</span> <span class="pl-ent">cache</span><span class="pl-k">:</span> <span class="pl-s">set data</span>
<span class="pl-k">deactivate</span> <span class="pl-ent">service</span></pre>
</div>
<p>It's good for general cases, for example with CRUD action.</p>
<p>
The bad things happen when cache and database are not consistent. For

29
posts/2023-07-30-cache-shenanigan.md
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@ -7,6 +7,35 @@ My default strategy is:
- Write to database first then to cache second
- Read from cache first, if not found then read from database second, then re-write to cache
```mermaid
sequenceDiagram
participant other
participant service
participant cache
participant db
other ->> service: get data
activate service
service ->> cache: get data
alt exist in cache
service -->> other: return data
else not exist in cache
service ->> db: get data
alt exist data in db
service -->> other: return data
else not exist data in db
service -->> other: return error not found
end
end
deactivate service
other ->> service: set data
activate service
service ->> db: set data
service ->> cache: set data
deactivate service
```
It's good for general cases, for example with CRUD action.
The bad things happen when cache and database are not consistent.