Module: Lorentz::Keys

Includes:
Glob
Included in:
Lorentz
Defined in:
lib/lorentz/keys.rb

Instance Method Summary collapse

Methods included from Glob

compile

Instance Method Details

#del(*keys) ⇒ Object 



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# File 'lib/lorentz/keys.rb', line 12

def del(*keys)
  run do
    keys.map{ |k| @db.delete(k) }.compact.size
  end
end

#exists(key) ⇒ Object 



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# File 'lib/lorentz/keys.rb', line 6

def exists(key)
  run do
    !!@db[key]
  end
end

#keys(pattern) ⇒ Object 



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# File 'lib/lorentz/keys.rb', line 18

def keys(pattern)
  run do
    @db.keys.grep(compile(pattern))
  end
end

#randomkey ⇒ Object 



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# File 'lib/lorentz/keys.rb', line 46

def randomkey
  return nil if @db.empty?
  run do
    @db.keys[rand(@db.keys.length)]
  end
end

#rename(key, newkey) ⇒ Object

Raises:



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# File 'lib/lorentz/keys.rb', line 24

def rename(key, newkey)
  if key == newkey
    raise LorentzException, "newkey: #{newkey} must be different than key: #{key}"
  end
  raise LorentzException, "key: #{key} does not exist" unless exists(key)
  save do
    val = get(key)
    del(key)
    set(newkey, val)
  end
end

#renamenx(key, newkey) ⇒ Object

Raises:



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# File 'lib/lorentz/keys.rb', line 36

def renamenx(key, newkey)
  if key == newkey
    raise LorentzException, "newkey: #{newkey} must be different than key: #{key}"
  end
  raise LorentzException, "key: #{key} does not exist" unless exists(key)
  return 0 if exists(newkey)
  rename(key, newkey)
  return 1
end