Class: Moneta::Adapters::Redis

Inherits:
Object
  • Object
show all
Includes:
Defaults
Defined in:
lib/moneta/adapters/redis.rb

Overview

Redis backend

Instance Method Summary collapse

Methods included from Defaults

#[], #[]=, #close, #decrement, #fetch

Methods included from OptionSupport

#expires, #prefix, #raw, #with

Constructor Details

#initialize(options = {}) ⇒ Redis

Returns a new instance of Redis.

Parameters:

  • options (Hash) (defaults to: {})

Options Hash (options):

  • :expires (Integer) —

    Default expiration time

  • Other (Object) —

    options passed to ‘Redis#new`



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# File 'lib/moneta/adapters/redis.rb', line 13

def initialize(options = {})
  @expires = options.delete(:expires)
  @redis = ::Redis.new(options)
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/redis.rb', line 66

def clear(options = {})
  @redis.flushdb
  self
end

#delete(key, options = {}) ⇒ Object

Delete the key from the store and return the current value

Parameters:

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

Returns:

  • (Object) —

    current value



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# File 'lib/moneta/adapters/redis.rb', line 50

def delete(key, options = {})
  if value = load(key, options)
    @redis.del(key)
    value
  end
end

#increment(key, amount = 1, options = {}) ⇒ Object

Note:

Not every Moneta store implements this method, a NotImplementedError is raised if it is not supported.

Atomically increment integer value with key

This method also accepts negative amounts.

Parameters:

  • key (Object)
  • amount (Integer) (defaults to: 1)
  • options (Hash) (defaults to: {})

Returns:

  • (Object) —

    value from store



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# File 'lib/moneta/adapters/redis.rb', line 58

def increment(key, amount = 1, options = {})
  value = @redis.incrby(key, amount)
  expires = (options[:expires] || @expires)
  @redis.expire(key, expires) if expires
  value
end

#key?(key, options = {}) ⇒ Boolean

Exists the value with key

Parameters:

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

Returns:

  • (Boolean) 


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# File 'lib/moneta/adapters/redis.rb', line 19

def key?(key, options = {})
  if @redis.exists(key)
    if expires = options[:expires]
      @redis.expire(key, expires)
    end
    true
  else
    false
  end
end

#load(key, options = {}) ⇒ Object

Fetch value with key. Return nil if the key doesn’t exist

Parameters:

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

Returns:

  • (Object) —

    value



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# File 'lib/moneta/adapters/redis.rb', line 31

def load(key, options = {})
  value = @redis.get(key)
  if value && (expires = options[:expires])
    @redis.expire(key, expires)
  end
  value
end

#store(key, value, options = {}) ⇒ Object

Store value with key

Parameters:

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

Returns:

  • value



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# File 'lib/moneta/adapters/redis.rb', line 40

def store(key, value, options = {})
  if expires = (options[:expires] || @expires)
    @redis.setex(key, expires, value)
  else
    @redis.set(key, value)
  end
  value
end