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