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The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Cache me outside
ANTHONY DANGHEAD OF TECHNOLOGY, THE COGWORKS
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Cache me outside. How ‘bout dat!
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Intro
● Cache Rational● Caching approaches
○ Partial Cache○ Output Cache / Donut Cache○ Custom Inline (method-level) Cache○ Redis○ Service Layer Cache○ CQRS○ Varnish / Fastly○ Cloudflare / Cloudfront○ CDNs
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Why Cache?
● Blazing fast UX● Limited bandwidth / API availability● Cost● Slow app
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Common Headaches
● Predictable Invalidation○ Multi-layer fallacy eg.
■ Data layer: 1min■ Service layer: 10min■ Presentation layer: 60min
● Security● Debugging● Always Enabled / Partially disabled
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Partial Caching
Cons● Cache invalidation● Hard to maintain
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Output Caching
● Controllers, Actions● Profiles
○ Not for Child Actions
Cons● Security
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Donut Cache
● Controllers, Actions● Profiles
Cons● Child actions● Nested partials● Hole punching => swiss cheese
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Umbraco Node Caching
● ID vs Node● Cache invalidation● Grid● Multi Node Tree Picker
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Umbraco Node Caching
20ms
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Umbraco Node Caching
● ?
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Custom Inline (method-level) Cache
● Granular control
Cons● Harder to understand● Code littering● Multi webheads● And….
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Custom Inline (method-level) Cache
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Custom Inline (method-level) Cache
● Unpredictable behaviour
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
IService Cache Pattern with IoC
Original method
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Custom Service Cache Pattern
● Swappable in IoC container● Granular caching of services
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Redis
● External Caching service● Alternative to HttpRuntime
○ Multiple web heads
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Redis
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Varnish
● Cached HTTP Proxy ● Granular rules
Cons● Crazy configs https://bit.ly/2tTO7Bd● Linux command line● A point of failure
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Cloudflare & Cloudfront
● Sits outside your application● Remember to clear - UmbracoFlare● SLA’s & confusing UX?
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
CDN
● UX● Assets● Clear by querystring
Cons● Custom deployment process
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Command Query Responsibility Segregation
“At its heart is the notion that you can use a different model to update information than the model you use to read information.” - Martin Fowler
● Page models > complexity than DB models● On save, construct a page model
Cons● Cache Invalidation is hard
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Debugging?● Turn it off!● Profiling
○ Ants○ Dot Trace
● Wrap suspicious code ● Monitor
○ Elmah.io ○ New Relic
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Which to choose?● Partial Cache● Output Cache● Donut Cache● HttpRuntime.Cache ● Redis● IService Layer with IoC● Varnish / Fastly● Cloudflare / Cloudfront● CDNs
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Considerations● Custom code => Code Debt
○ Only cache if you need to!● Multiple layers => multiple headaches● WAF
○ Azure Application Gateway >100USD○ Cloudflare >20 USD
● Why & What?○ Sitemap.xml?
● Cache purge failure
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Considerations - Multiple Layers
● Endpoint limits / throttling○ Custom Datalayer / Service IoC
● Tree crawling○ Custom Datalayer / Service IoC
● Better HTML response○ Donut caching
● Uptime availability / UX○ Varnish / Cloudfront
The Cogworks - UK’s Leading Umbraco Gold Partnerthecogworks.com
Thanks@anthonydotnet
Elmah.io Promocode: umbracospark2019
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