Class: Moneta::Adapters::Sequel

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

Overview

Sequel backend

Instance Method Summary collapse

Methods included from Defaults

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

Methods included from OptionSupport

#expires, #prefix, #raw, #with

Constructor Details

#initialize(options = {}) ⇒ Sequel

Returns a new instance of Sequel.

Parameters:

  • options (Hash) (defaults to: {})

Options Hash (options):

  • :db (String) —

    Sequel database

  • :table (String/Symbol) — default: :moneta —

    Table name

  • All (Object) —

    other options passed to ‘Sequel#connect`

Raises:

  • (ArgumentError) 


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# File 'lib/moneta/adapters/sequel.rb', line 14

def initialize(options = {})
  raise ArgumentError, 'Option :db is required' unless db = options.delete(:db)
  table = options.delete(:table) || :moneta
  @db = ::Sequel.connect(db, options)
  @db.create_table?(table) do
    String :k, :null => false, :primary_key => true
    String :v
  end
  @table = @db[table]
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/sequel.rb', line 77

def clear(options = {})
  @table.delete
  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/sequel.rb', line 67

def delete(key, options = {})
  @db.transaction do
    if value = load(key, options)
      @table.filter(:k => key).delete
      value
    end
  end
end

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

Atomically increment integer value with key

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

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/sequel.rb', line 49

def increment(key, amount = 1, options = {})
  @db.transaction do
    locked_table = @table.for_update
    if record = locked_table[:k => key]
      value = record[:v]
      intvalue = value.to_i
      raise 'Tried to increment non integer value' unless value == nil || intvalue.to_s == value.to_s
      intvalue += amount
      locked_table.update(:k => key, :v => intvalue.to_s)
      intvalue
    else
      locked_table.insert(:k => key, :v => amount.to_s)
      amount
    end
  end
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/sequel.rb', line 26

def key?(key, options = {})
  @table[:k => key] != nil
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/sequel.rb', line 31

def load(key, options = {})
  record = @table[:k => key]
  record && record[:v]
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/sequel.rb', line 37

def store(key, value, options = {})
  @db.transaction do
    if key?(key, options)
      @table.update(:k => key, :v => value)
    else
      @table.insert(:k => key, :v => value)
    end
    value
  end
end