Class: KeepYourHead::Cache

Inherits:
Object
  • Object
show all
Defined in:
lib/Keepyourhead/Cache.rb

Constant Summary collapse

CachePath = 
Resources::user("cache/")
Filename = 
::File.expand_path( "index.yaml", CachePath )
MaxAge =

60 days

2 * 30 * 24 * 60 * 60
MaxSize =

25 mb

25 * 1024 * 1024

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/Keepyourhead/Cache.rb', line 61

def initialize
  @monitor = Monitor.new
  load
end

Instance Attribute Details

#cacheSize ⇒ Object

Returns the value of attribute cacheSize.



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# File 'lib/Keepyourhead/Cache.rb', line 59

def cacheSize
  @cacheSize
end

Instance Method Details

#addCompilation(compilation) ⇒ Object 



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# File 'lib/Keepyourhead/Cache.rb', line 150

def addCompilation( compilation )
  if compilation.success then
    filenames = compilation.filenames.map { |filename| fnew = createNewFilename; ::FileUtils.cp(filename, fnew); fnew }

    item = CacheItem.new self, true, filenames, Time.new
  else
    item = CacheItem.new self, false, [], Time.new
  end

  lock {
    @cache[compilation.content] = item
    self.cacheSize += item.size if self.cacheSize
  }

  checkSize
end

#getCacheItem(flashcard, type, compileOptions = {}, &block) ⇒ Object 



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# File 'lib/Keepyourhead/Cache.rb', line 123

def getCacheItem( flashcard, type, compileOptions = {}, &block)
  width ||= Gdk::Screen.default.width
  if not hasCacheItem( flashcard, type, compileOptions, &block ) then
    compilation = flashcard.compileImage( type, compileOptions )
    addCompilation( compilation )
    ret = hasCacheItem( flashcard, type, compileOptions, &block )
    compilation.remove

    assert ret
  end
end

#hasCacheItem(flashcard, type, compileOptions = {}, &block) ⇒ Object 



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# File 'lib/Keepyourhead/Cache.rb', line 135

def hasCacheItem( flashcard, type, compileOptions = {}, &block )
  item = nil
  
  content = flashcard.content(type, compileOptions)
  lock {
    item = @cache[content]
  
    item.lastAccess = Time.new if item

    block.call(item) if block
  }

  not item == nil
end

#load ⇒ Object 



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# File 'lib/Keepyourhead/Cache.rb', line 66

def load
  lock {
    ::File::makedirs CachePath unless ::File.exist? CachePath

    @cache = {}
    begin
      data = []
      File.open( Filename, "r") {|file|
        data = YAML.load( file )
      }

#       pp data.inspect
      data.each { |key, success, filenames,lastAccess|
        item = CacheItem.new self, success, filenames || [], Time.parse(lastAccess)
        if item and item.ok? then
          @cache[key] = item
        end
      }

#       print "Cache loaded #{@cache.length} items"
    rescue Errno::ENOENT
      @cache = {}
      print "Cache not found - recreating"
    end

    cleanUp
    
    checkSize
  }
end

#writeBack ⇒ Object 



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# File 'lib/Keepyourhead/Cache.rb', line 97

def writeBack
  lock {
    ::File::makedirs CachePath unless ::File.exist? CachePath

    cleanUp
    removeOld
    checkSize
    
    ::File.mkdirs CachePath unless ::File.directory? CachePath

    ::File.open( Filename, "w" ) { |file|
      data = []
      @cache.each { |key,item| 
        data << [key, item.success, item.filenames, item.lastAccess.to_s] 
      }
      file << data.to_yaml
#       YAML::dump(data, file)
    }
  }
end