Class: Moneta::Adapters::LevelDB

Inherits:
Memory
  • Object
show all
Defined in:
lib/moneta/adapters/leveldb.rb

Overview

LevelDB backend

Instance Attribute Summary

Attributes included from HashAdapter

#backend

Instance Method Summary collapse

Methods included from CreateSupport

#create, included

Methods included from IncrementSupport

included, #increment

Methods included from HashAdapter

#delete, #load, #store

Methods included from Defaults

#[], #[]=, #create, #decrement, #features, #fetch, included, #increment, #supports?

Methods included from OptionSupport

#expires, #prefix, #raw, #with

Constructor Details

#initialize(options = {}) ⇒ LevelDB

Returns a new instance of LevelDB.

Parameters:

  • options (Hash) (defaults to: {})

Options Hash (options):

  • :dir (String) —

    • Database path

  • All (Object) —

    other options passed to ‘LevelDB::DB#new`

  • :backend (::LevelDB::DB) —

    Use existing backend instance



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# File 'lib/moneta/adapters/leveldb.rb', line 12

def initialize(options = {})
  @backend = options[:backend] ||
    begin
      raise ArgumentError, 'Option :dir is required' unless options[:dir]
      ::LevelDB::DB.new(options[:dir])
    end
end

Instance Method Details

#clear(options = {}) ⇒ void

This method returns an undefined value.

Clear all keys in this store

Parameters:

  • options (Hash) (defaults to: {}) 


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# File 'lib/moneta/adapters/leveldb.rb', line 26

def clear(options = {})
  @backend.each {|k,v| delete(k, options) }
  self
end

#close ⇒ Object

Explicitly close the store

Returns:

  • nil



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# File 'lib/moneta/adapters/leveldb.rb', line 32

def close
  @backend.close
  nil
end

#key?(key, options = {}) ⇒ Boolean

Exists the value with key

Parameters:

  • key (Object)
  • options (Hash) (defaults to: {})

Options Hash (options):

  • :expires (Integer) —

    Update expiration time (See Expires)

  • :prefix (String) —

    Prefix key (See Transformer)

  • Other (Object) —

    options as defined by the adapters or middleware

Returns:

  • (Boolean) 


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# File 'lib/moneta/adapters/leveldb.rb', line 21

def key?(key, options = {})
  @backend.includes?(key)
end