Class: Prez::Cache

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

Constant Summary collapse

DIR = 
".prez-cache"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/prez/cache.rb', line 11

def initialize
  unless File.directory?(dir)
    Dir.mkdir dir
  end

  if File.exists?(toc_file)
    @toc = YAML.load File.read(toc_file)
  else
    @toc = { prez_version: Prez::Version.to_s }
  end
end

Instance Attribute Details

#toc ⇒ Object (readonly)

Returns the value of attribute toc.



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# File 'lib/prez/cache.rb', line 9

def toc
  @toc
end

Class Method Details

.get(key, pre_cache_contents) ⇒ Object 



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# File 'lib/prez/cache.rb', line 73

def get(key, pre_cache_contents)
  hash = md5 pre_cache_contents

  if instance.include?(key, hash)
    instance.get key, hash
  else
    yield.tap do |results|
      instance.put key, hash, results
    end
  end
end

.instance ⇒ Object 



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# File 'lib/prez/cache.rb', line 89

def instance
  @instance ||= Prez::Cache.new
end

.md5(contents) ⇒ Object 



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# File 'lib/prez/cache.rb', line 85

def md5(contents)
  Digest::MD5.hexdigest contents
end

Instance Method Details

#cached_path(key, hash) ⇒ Object 



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# File 'lib/prez/cache.rb', line 35

def cached_path(key, hash)
  File.join dir, Prez::Cache.md5(key), hash
end

#dir ⇒ Object 



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# File 'lib/prez/cache.rb', line 23

def dir
  Prez::Cache::DIR
end

#get(key, hash) ⇒ Object 



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# File 'lib/prez/cache.rb', line 39

def get(key, hash)
  File.read cached_path(key, hash)
ensure
  toc[key][:last_touched][hash] = Time.now
  save
end

#include?(key, hash) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prez/cache.rb', line 31

def include?(key, hash)
  toc.include?(key) && File.file?(cached_path(key, hash))
end

#put(key, hash, contents) ⇒ Object 



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# File 'lib/prez/cache.rb', line 46

def put(key, hash, contents)
  unless include?(key, hash)
    toc[key] = {
      last_touched: {},
      saved: {}
    }
  end

  path = cached_path key, hash

  unless File.directory?(File.dirname(path))
    FileUtils.makedirs File.dirname(path)
  end

  File.write path, contents
  toc[key][:key_hash] = Prez::Cache.md5 key
  toc[key][:last_touched][hash] = Time.now
  toc[key][:saved][hash] = Time.now
ensure
  save
end

#save ⇒ Object 



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# File 'lib/prez/cache.rb', line 68

def save
  File.write toc_file, YAML.dump(toc)
end

#toc_file ⇒ Object 



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

def toc_file
  File.join dir, "toc.yml"
end