Started again with Rails 4

[feedcatcher.git] / vendor / rails / activerecord / lib / active_record / locking / pessimistic.rb

diff --git a/vendor/rails/activerecord/lib/active_record/locking/pessimistic.rb b/vendor/rails/activerecord/lib/active_record/locking/pessimistic.rb
deleted file mode 100644 (file)
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--- a/vendor/rails/activerecord/lib/active_record/locking/pessimistic.rb
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@@ -1,77 +0,0 @@
-# Copyright (c) 2006 Shugo Maeda <shugo@ruby-lang.org>
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject
-# to the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
-# ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
-# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-
-module ActiveRecord
-  module Locking
-    # Locking::Pessimistic provides support for row-level locking using
-    # SELECT ... FOR UPDATE and other lock types.
-    #
-    # Pass <tt>:lock => true</tt> to ActiveRecord::Base.find to obtain an exclusive
-    # lock on the selected rows:
-    #   # select * from accounts where id=1 for update
-    #   Account.find(1, :lock => true)
-    #
-    # Pass <tt>:lock => 'some locking clause'</tt> to give a database-specific locking clause
-    # of your own such as 'LOCK IN SHARE MODE' or 'FOR UPDATE NOWAIT'.
-    #
-    # Example:
-    #   Account.transaction do
-    #     # select * from accounts where name = 'shugo' limit 1 for update
-    #     shugo = Account.find(:first, :conditions => "name = 'shugo'", :lock => true)
-    #     yuko = Account.find(:first, :conditions => "name = 'yuko'", :lock => true)
-    #     shugo.balance -= 100
-    #     shugo.save!
-    #     yuko.balance += 100
-    #     yuko.save!
-    #   end
-    #
-    # You can also use ActiveRecord::Base#lock! method to lock one record by id.
-    # This may be better if you don't need to lock every row. Example:
-    #   Account.transaction do
-    #     # select * from accounts where ...
-    #     accounts = Account.find(:all, :conditions => ...)
-    #     account1 = accounts.detect { |account| ... }
-    #     account2 = accounts.detect { |account| ... }
-    #     # select * from accounts where id=? for update
-    #     account1.lock!
-    #     account2.lock!
-    #     account1.balance -= 100
-    #     account1.save!
-    #     account2.balance += 100
-    #     account2.save!
-    #   end
-    #
-    # Database-specific information on row locking:
-    #   MySQL: http://dev.mysql.com/doc/refman/5.1/en/innodb-locking-reads.html
-    #   PostgreSQL: http://www.postgresql.org/docs/8.1/interactive/sql-select.html#SQL-FOR-UPDATE-SHARE
-    module Pessimistic
-      # Obtain a row lock on this record. Reloads the record to obtain the requested
-      # lock. Pass an SQL locking clause to append the end of the SELECT statement
-      # or pass true for "FOR UPDATE" (the default, an exclusive row lock).  Returns
-      # the locked record.
-      def lock!(lock = true)
-        reload(:lock => lock) unless new_record?
-        self
-      end
-    end
-  end
-end