Class: Moneta::Adapters::Redis

Inherits:
Moneta::Adapter show all
Includes:
ExpiresSupport
Defined in:
lib/moneta/adapters/redis.rb

Overview

Redis backend

Instance Attribute Summary

Attributes inherited from Moneta::Adapter

#backend

Instance Method Summary collapse

Methods included from ExpiresSupport

included

Methods inherited from Moneta::Adapter

backend, backend_block, backend_required?

Methods included from Config

#config, included

Methods included from Defaults

#[], #[]=, #decrement, #features, #fetch, #fetch_values, included, #slice, #supports?, #update

Methods included from OptionSupport

#expires, #prefix, #raw, #with

Constructor Details

#initialize(options = {}) ⇒ Object

Options Hash (options):

  • :expires (Integer) —

    Default expiration time

  • :backend (::Redis) —

    Use existing backend instance

  • Other (Object) —

    options passed to ‘Redis#new`



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# File 'lib/moneta/adapters/redis.rb', line 17

backend { |**options| ::Redis.new(options) }

Instance Method Details

#clear(options = {}) ⇒ void

This method returns an undefined value.

Clear all keys in this store



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# File 'lib/moneta/adapters/redis.rb', line 77

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

#close ⇒ Object

Explicitly close the store



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# File 'lib/moneta/adapters/redis.rb', line 95

def close
  @backend.quit
  nil
end

#create(key, value, options = {}) ⇒ Boolean

Note:

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

Atomically sets a key to value if it’s not set.

Options Hash (options):

  • :expires (Integer) —

    Update expiration time (See Expires)

  • :raw (Boolean) —

    Raw access without value transformation (See Transformer)

  • :prefix (String) —

    Prefix key (See Transformer)



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# File 'lib/moneta/adapters/redis.rb', line 83

def create(key, value, options = {})
  expires = expires_value(options, config.expires)

  if @backend.setnx(key, value)
    update_expires(@backend, key, expires)
    true
  else
    false
  end
end

#delete(key, options = {}) ⇒ Object

Delete the key from the store and return the current value

Options Hash (options):

  • :raw (Boolean) —

    Raw access without value transformation (See Transformer)

  • :prefix (String) —

    Prefix key (See Transformer)

  • Other (Object) —

    options as defined by the adapters or middleware



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# File 'lib/moneta/adapters/redis.rb', line 60

def delete(key, options = {})
  future = nil
  @backend.pipelined do |pipeline|
    future = pipeline.get(key)
    pipeline.del(key)
  end
  future.value
end

#each_key ⇒ Enumerator #each_key {|key| ... } ⇒ self

Note:

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

Calls block once for each key in store, passing the key as a parameter. If no block is given, an enumerator is returned instead.

Overloads:

  • #each_key {|key| ... } ⇒ self

    Yield Parameters:

    • key (Object) —

      Each key is yielded to the supplied block



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# File 'lib/moneta/adapters/redis.rb', line 34

def each_key(&block)
  return enum_for(:each_key) unless block_given?

  @backend.scan_each { |k| yield(k) }
  self
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.

Options Hash (options):

  • :prefix (String) —

    Prefix key (See Transformer)

  • Other (Object) —

    options as defined by the adapters or middleware



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# File 'lib/moneta/adapters/redis.rb', line 70

def increment(key, amount = 1, options = {})
  with_expiry_update(key, **options) do |pipeline_handle|
    pipeline_handle.incrby(key, amount)
  end
end

#key?(key, options = {}) ⇒ Boolean

Exists the value with key

This method considers false and 0 as “no-expire” and every positive number as a time to live in seconds.

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



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# File 'lib/moneta/adapters/redis.rb', line 23

def key?(key, options = {})
  with_expiry_update(key, default: nil, **options) do |pipeline_handle|
    if pipeline_handle.respond_to?(:exists?)
      pipeline_handle.exists?(key)
    else
      pipeline_handle.exists(key)
    end
  end
end

#load(key, options = {}) ⇒ Object

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

Options Hash (options):

  • :expires (Integer) —

    Update expiration time (See Expires)

  • :raw (Boolean) —

    Raw access without value transformation (See Transformer)

  • :prefix (String) —

    Prefix key (See Transformer)

  • :sync (Boolean) —

    Synchronized load (Cache reloads from adapter, Daybreak syncs with file)

  • Other (Object) —

    options as defined by the adapters or middleware



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# File 'lib/moneta/adapters/redis.rb', line 42

def load(key, options = {})
  with_expiry_update(key, default: nil, **options) do |pipeline_handle|
    pipeline_handle.get(key)
  end
end

#merge!(pairs, options = {}) ⇒ self #merge!(pairs, options = {}) {|key, old_value, new_value| ... } ⇒ self

Note:

Some adapters may implement this method atomically, or in two passes when a block is provided. The default implmentation uses #key?, #load and #store.

Stores the pairs in the key-value store, and returns itself. When a block is provided, it will be called before overwriting any existing values with the key, old value and supplied value, and the return value of the block will be used in place of the supplied value.

Overloads:

  • #merge!(pairs, options = {}) {|key, old_value, new_value| ... } ⇒ self

    Yield Parameters:

    • key (Object) —

      A key that whose value is being overwritten

    • old_value (Object) —

      The existing value which is being overwritten

    • new_value (Object) —

      The value supplied in the method call

    Yield Returns:

    • (Object) —

      The value to use for overwriting



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# File 'lib/moneta/adapters/redis.rb', line 108

def merge!(pairs, options = {})
  keys = pairs.map { |key, _| key }.to_a
  return self if keys.empty?

  if block_given?
    old_values = @backend.mget(*keys)
    updates = pairs.each_with_index.with_object({}) do |(pair, i), updates|
      old_value = old_values[i]
      if old_value != nil
        key, new_value = pair
        updates[key] = yield(key, old_value, new_value)
      end
    end
    unless updates.empty?
      pairs = if pairs.respond_to?(:merge)
                pairs.merge(updates)
              else
                Hash[pairs.to_a].merge!(updates)
              end
    end
  end

  with_expiry_update(*keys, **options) do |pipeline_handle|
    pipeline_handle.mset(*pairs.to_a.flatten(1))
  end

  self
end

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

Store value with key

Options Hash (options):

  • :expires (Integer) —

    Set expiration time (See Expires)

  • :raw (Boolean) —

    Raw access without value transformation (See Transformer)

  • :prefix (String) —

    Prefix key (See Transformer)

  • Other (Object) —

    options as defined by the adapters or middleware



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# File 'lib/moneta/adapters/redis.rb', line 49

def store(key, value, options = {})
  if expires = expires_value(options)
    Numeric === expires and expires = (expires * 1000).to_i
    @backend.psetex(key, expires, value)
  else
    @backend.set(key, value)
  end
  value
end

#values_at(*keys, **options) ⇒ Array<Object, nil>

Note:

Some adapters may implement this method atomically, but the default implementation simply makes repeated calls to #load.

Returns an array containing the values associated with the given keys, in the same order as the supplied keys. If a key is not present in the key-value-store, nil is returned in its place.

Options Hash (**options):

  • :expires (Integer) —

    Update expiration time (See Expires)

  • :raw (Boolean) —

    Raw access without value transformation (See Transformer)

  • :prefix (String) —

    Prefix key (See Transformer)

  • :sync (Boolean) —

    Synchronized load (Cache reloads from adapter, Daybreak syncs with file)

  • Other (Object) —

    options as defined by the adapters or middleware



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# File 'lib/moneta/adapters/redis.rb', line 101

def values_at(*keys, **options)
  with_expiry_update(*keys, default: nil, **options) do |pipeline_handle|
    pipeline_handle.mget(*keys)
  end
end