Class: Moneta::Adapters::MongoMoped

Inherits:
MongoBase
  • Object
show all
Defined in:
lib/moneta/adapters/mongo/moped.rb

Overview

MongoDB backend

Supports expiration, documents will be automatically removed starting with mongodb >= 2.2 (see http://docs.mongodb.org/manual/tutorial/expire-data/).

You can store hashes directly using this adapter.

Examples:

Store hashes

db = Moneta::Adapters::MongoMoped.new
db['key'] = {a: 1, b: 2}

Constant Summary

Constants inherited from MongoBase

Moneta::Adapters::MongoBase::DEFAULT_PORT

Instance Attribute Summary

Attributes inherited from MongoBase

#backend

Attributes included from ExpiresSupport

#default_expires

Instance Method Summary collapse

Methods included from Defaults

#[], #[]=, #close, #decrement, #each_key, #features, #fetch, #fetch_values, included, #key?, #merge!, #slice, #supports?, #values_at

Methods included from OptionSupport

#expires, #prefix, #raw, #with

Constructor Details

#initialize(options = {}) ⇒ MongoMoped

Returns a new instance of MongoMoped

Options Hash (options):

  • :collection (String) — default: 'moneta'

    MongoDB collection name

  • :host (String) — default: '127.0.0.1'

    MongoDB server host

  • :user (String)

    Username used to authenticate

  • :password (String)

    Password used to authenticate

  • :port (Integer) — default: MongoDB default port

    MongoDB server port

  • :db (String) — default: 'moneta'

    MongoDB database

  • :expires (Integer)

    Default expiration time

  • :expires_field (String) — default: 'expiresAt'

    Document field to store expiration time

  • :value_field (String) — default: 'value'

    Document field to store value

  • :type_field (String) — default: 'type'

    Document field to store value type

  • :backend (::Moped::Session)

    Use existing backend instance

  • Other (Object)

    options passed to `Moped::Session#new`


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

def initialize(options = {})
  super(options)
  collection = options.delete(:collection) || 'moneta'
  db = options.delete(:db) || 'moneta'
  user = options.delete(:user)
  password = options.delete(:password)
  @backend = options[:backend] ||
    begin
      host = options.delete(:host) || '127.0.0.1'
      port = options.delete(:port) || DEFAULT_PORT
      ::Moped::Session.new(["#{host}:#{port}"])
    end
  @backend.use(db)
  @backend.(user, password) if user && password
  @collection = @backend[collection]
  if @backend.command(buildinfo: 1)['version'] >= '2.2'
    @collection.indexes.create({ @expires_field => 1 }, expireAfterSeconds: 0)
  else
    warn 'Moneta::Adapters::Mongo - You are using MongoDB version < 2.2, expired documents will not be deleted'
  end
end

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/mongo/moped.rb', line 109

def clear(options = {})
  @collection.find.remove_all
  self
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/mongo/moped.rb', line 97

def create(key, value, options = {})
  key = to_binary(key)
  @backend.with(safe: true, consistency: :strong) do |safe|
    safe[@collection.name].insert(value_to_doc(key, value, options))
  end
  true
rescue ::Moped::Errors::MongoError => ex
  raise if ex.details['code'] != 11000 # duplicate key error
  false
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/mongo/moped.rb', line 74

def delete(key, options = {})
  value = load(key, options)
  @collection.find(_id: to_binary(key)).remove if value
  value
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/mongo/moped.rb', line 81

def increment(key, amount = 1, options = {})
  @backend.with(safe: true, consistency: :strong) do |safe|
    safe[@collection.name].
      find(_id: to_binary(key)).
      modify({:$inc => { @value_field => amount }},
             new: true,
             upsert: true)[@value_field]
  end
rescue ::Moped::Errors::OperationFailure
  tries ||= 0
  tries += 1
  retry if tries < 3
  raise # otherwise
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/mongo/moped.rb', line 55

def load(key, options = {})
  key = to_binary(key)
  doc = @collection.find(_id: key).one
  if doc && (!doc[@expires_field] || doc[@expires_field] >= Time.now)
    # @expires_field must be a Time object (BSON date datatype)
    expires = expires_at(options, nil)
    @collection.find(_id: key).update(:$set => { @expires_field => expires || nil }) if expires != nil
    doc_to_value(doc)
  end
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/mongo/moped.rb', line 67

def store(key, value, options = {})
  key = to_binary(key)
  @collection.find(_id: key).upsert(value_to_doc(key, value, options))
  value
end