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Name	Size	Permission
memcached	[ DIR ]	drwxr-xr-x
mongo	[ DIR ]	drwxr-xr-x
activerecord.rb	4.47 KB	-rw-r--r--
cassandra.rb	3.37 KB	-rw-r--r--
client.rb	2.05 KB	-rw-r--r--
cookie.rb	967 B	-rw-r--r--
couch.rb	3.85 KB	-rw-r--r--
datamapper.rb	2.34 KB	-rw-r--r--
daybreak.rb	1.17 KB	-rw-r--r--
dbm.rb	615 B	-rw-r--r--
file.rb	3.18 KB	-rw-r--r--
fog.rb	1.54 KB	-rw-r--r--
gdbm.rb	606 B	-rw-r--r--
hbase.rb	3.06 KB	-rw-r--r--
leveldb.rb	929 B	-rw-r--r--
lmdb.rb	2.17 KB	-rw-r--r--
localmemcache.rb	766 B	-rw-r--r--
lruhash.rb	2.69 KB	-rw-r--r--
memcached.rb	385 B	-rw-r--r--
memory.rb	450 B	-rw-r--r--
mongo.rb	225 B	-rw-r--r--
null.rb	668 B	-rw-r--r--
pstore.rb	1.97 KB	-rw-r--r--
redis.rb	2.35 KB	-rw-r--r--
restclient.rb	1.31 KB	-rw-r--r--
riak.rb	1.69 KB	-rw-r--r--
sdbm.rb	606 B	-rw-r--r--
sequel.rb	3.74 KB	-rw-r--r--
sqlite.rb	2.68 KB	-rw-r--r--
tdb.rb	609 B	-rw-r--r--
tokyocabinet.rb	1.38 KB	-rw-r--r--
tokyotyrant.rb	3.24 KB	-rw-r--r--
yaml.rb	238 B	-rw-r--r--

Code Editor : sequel.rb

require 'sequel'

module Moneta
  module Adapters
    # Sequel backend
    # @api public
    class Sequel
      include Defaults

# Sequel::UniqueConstraintViolation is defined since sequel 3.44.0
      # older versions raise a Sequel::DatabaseError.
      UniqueConstraintViolation = defined?(::Sequel::UniqueConstraintViolation) ? ::Sequel::UniqueConstraintViolation : ::Sequel::DatabaseError

supports :create, :increment
      attr_reader :backend

# @param [Hash] options
      # @option options [String] :db Sequel database
      # @option options [String/Symbol] :table (:moneta) Table name
      # @option options [Array] :extensions ([]) List of Sequel extensions
      # @option options [Integer] :connection_validation_timeout (nil) Sequel connection_validation_timeout
      # @option options All other options passed to `Sequel#connect`
      # @option options [Sequel connection] :backend Use existing backend instance
      def initialize(options = {})
        table = (options.delete(:table) || :moneta).to_sym
        extensions = options.delete(:extensions) || []
        raise ArgumentError, 'Option :extensions must be an Array' unless extensions.is_a?(Array)
        connection_validation_timeout = options.delete(:connection_validation_timeout)
        @backend = options[:backend] ||
          begin
            raise ArgumentError, 'Option :db is required' unless db = options.delete(:db)
            ::Sequel.connect(db, options)
          end
        extensions.each do |extension|
          @backend.extension(extension.to_sym)
        end
        @backend.pool.connection_validation_timeout = connection_validation_timeout if connection_validation_timeout
        @backend.create_table?(table) do
          String :k, null: false, primary_key: true
          File :v
        end
        @table = @backend[table]
      end

# (see Proxy#key?)
      def key?(key, options = {})
        @table[k: key] != nil
      end

# (see Proxy#load)
      def load(key, options = {})
        record = @table[k: key]
        record && record[:v]
      end

# (see Proxy#store)
      def store(key, value, options = {})
        begin
          @table.insert(k: key, v: blob(value))
        rescue UniqueConstraintViolation
          @table.where(k: key).update(v: blob(value))
        end
        value
      rescue ::Sequel::DatabaseError
        tries ||= 0
        (tries += 1) < 10 ? retry : raise
      end

# (see Proxy#store)
      def create(key, value, options = {})
        @table.insert(k: key, v: blob(value))
        true
      rescue UniqueConstraintViolation
        false
      end

# (see Proxy#increment)
      def increment(key, amount = 1, options = {})
        @backend.transaction do
          locked_table = @table.for_update
          if record = locked_table[k: key]
            value = Utils.to_int(record[:v]) + amount
            locked_table.where(k: key).update(v: blob(value.to_s))
            value
          else
            locked_table.insert(k: key, v: blob(amount.to_s))
            amount
          end
        end
      rescue ::Sequel::DatabaseError
        # Concurrent modification might throw a bunch of different errors
        tries ||= 0
        (tries += 1) < 10 ? retry : raise
      end

# (see Proxy#delete)
      def delete(key, options = {})
        if value = load(key, options)
          @table.filter(k: key).delete
          value
        end
      end

# (see Proxy#clear)
      def clear(options = {})
        @table.delete
        self
      end

# (see Proxy#close)
      def close
        @backend.disconnect
        nil
      end

private

# See https://github.com/jeremyevans/sequel/issues/715
      def blob(s)
        s.empty? ? '' : ::Sequel.blob(s)
      end
    end
  end
end

${this.title}

Code Editor : sequel.rb