Class: HLS::Cache

Inherits:
Object
  • Object
show all
Defined in:
lib/hls/cache.rb

Overview

Wraps a Rails.cache-shaped backend with a TTL so the read-side Manifest can call ‘cache.fetch(key) { … }` without plumbing the TTL alongside the backend at every call site.

Profile classes attach an instance via ‘cache`:

class CourseVideo < ApplicationVideo
  def self.cache = HLS::Cache.new(backend: Rails.cache, ttl: 5.minutes)
end

The Manifest also accepts any object responding to ‘fetch(key, &block)` directly — wrapping is just the convenience path for backends like Rails.cache that need a TTL hint.

Constant Summary collapse

DEFAULT_TTL = 
300

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(backend:, ttl: DEFAULT_TTL) ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/hls/cache.rb', line 22

def initialize(backend:, ttl: DEFAULT_TTL)
  @backend = backend
  @ttl = Integer(ttl)
end

Instance Attribute Details

#backend ⇒ Object (readonly)

Returns the value of attribute backend.



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# File 'lib/hls/cache.rb', line 20

def backend
  @backend
end

#ttl ⇒ Object (readonly)

Returns the value of attribute ttl.



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# File 'lib/hls/cache.rb', line 20

def ttl
  @ttl
end

Instance Method Details

#fetch(key, &block) ⇒ Object 



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# File 'lib/hls/cache.rb', line 27

def fetch(key, &block)
  backend.fetch(key, expires_in: ttl, &block)
end