Class: CacheMethod::CachedResult

Inherits:
Object
  • Object
show all
Defined in:
lib/cache_method/cached_result.rb,
lib/cache_method/debug.rb

Overview

:nodoc: all

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(obj, method_id, original_method_id, ttl, args, &blk) ⇒ CachedResult 



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# File 'lib/cache_method/cached_result.rb', line 3

def initialize(obj, method_id, original_method_id, ttl, args, &blk)
  @obj = obj
  @method_id = method_id
  @method_signature = CacheMethod.method_signature obj, method_id
  @original_method_id = original_method_id
  @ttl = ttl || CacheMethod.config.default_ttl
  @args = args
  @args_digest = args.empty? ? 'empty' : CacheMethod.digest(args)
  @blk = blk
  @fetch_mutex = ::Mutex.new
end

Instance Attribute Details

#args ⇒ Object (readonly)

Returns the value of attribute args.



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# File 'lib/cache_method/cached_result.rb', line 19

def args
  @args
end

#args_digest ⇒ Object (readonly)

Returns the value of attribute args_digest.



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# File 'lib/cache_method/cached_result.rb', line 20

def args_digest
  @args_digest
end

#blk ⇒ Object (readonly)

Returns the value of attribute blk.



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# File 'lib/cache_method/cached_result.rb', line 21

def blk
  @blk
end

#method_id ⇒ Object (readonly)

Returns the value of attribute method_id.



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# File 'lib/cache_method/cached_result.rb', line 16

def method_id
  @method_id
end

#method_signature ⇒ Object (readonly)

Returns the value of attribute method_signature.



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# File 'lib/cache_method/cached_result.rb', line 17

def method_signature
  @method_signature
end

#obj ⇒ Object (readonly)

Returns the value of attribute obj.



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# File 'lib/cache_method/cached_result.rb', line 15

def obj
  @obj
end

#original_method_id ⇒ Object (readonly)

Returns the value of attribute original_method_id.



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# File 'lib/cache_method/cached_result.rb', line 18

def original_method_id
  @original_method_id
end

#ttl ⇒ Object (readonly)

Returns the value of attribute ttl.



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# File 'lib/cache_method/cached_result.rb', line 22

def ttl
  @ttl
end

Instance Method Details

#debug_get_wrapped ⇒ Object Also known as: get_wrapped 



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# File 'lib/cache_method/debug.rb', line 13

def debug_get_wrapped
  retval = original_get_wrapped
  if retval
    # $stderr.puts
    # $stderr.puts "[cache_method] GET: #{method_signature}(#{args.inspect})"
  else
    cache_key = CacheMethod.resolve_cache_key obj
    m = Marshal.dump cache_key
    $stderr.puts
    $stderr.puts "[cache_method] GET (miss!): #{method_signature}(#{args.inspect}) - #{::Digest::SHA1.hexdigest(m)} - #{cache_key.inspect}"
  end
  retval
end

#debug_set_wrapped ⇒ Object Also known as: set_wrapped 



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# File 'lib/cache_method/debug.rb', line 29

def debug_set_wrapped
  retval = original_set_wrapped
  m = Marshal.dump retval
  if m.length > 1000
    $stderr.puts
    $stderr.puts "[cache_method] SET (#{'X' * (m.length / 1024)}): #{method_signature}(#{args.inspect}) -> #{retval.inspect}"
  else
    # $stderr.puts
    # $stderr.puts "[cache_method] SET: #{method_signature}(#{args.inspect})"
  end
  retval
end

#exist? ⇒ Boolean 



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# File 'lib/cache_method/cached_result.rb', line 45

def exist?
  CacheMethod.config.storage.exist?(cache_key)
end

#fetch ⇒ Object

Store things wrapped in an Array so that nil is accepted



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# File 'lib/cache_method/cached_result.rb', line 25

def fetch
  if wrapped_v = get_wrapped
    wrapped_v.first
  else
    if @fetch_mutex.try_lock
      # i got the lock, so don't bother trying to get first
      begin
        set_wrapped.first
      ensure
        @fetch_mutex.unlock
      end
    else
      # i didn't get the lock, so get in line, and do try to get first
      @fetch_mutex.synchronize do
        (get_wrapped || set_wrapped).first
      end
    end
  end
end

#original_get_wrapped ⇒ Object 



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# File 'lib/cache_method/debug.rb', line 26

alias :original_get_wrapped :get_wrapped

#original_set_wrapped ⇒ Object 



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# File 'lib/cache_method/debug.rb', line 41

alias :original_set_wrapped :set_wrapped