Module: AfterCommit::ConnectionAdapters

Defined in:
lib/after_commit/connection_adapters.rb

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/after_commit/connection_adapters.rb', line 3

def self.included(base)
  base.class_eval do

    if method_defined?(:transaction)
      def transaction_with_callback(*args, &block)
        # @disable_rollback is set to false at the start of the
        # outermost call to #transaction.  After committing, it is
        # set to true to prevent exceptions causing a spurious
        # rollback.
        outermost_call = @disable_rollback.nil?
        @disable_rollback = false if outermost_call
        transaction_without_callback(*args, &block)
      ensure
        @disable_rollback = nil if outermost_call
      end
      alias_method_chain :transaction, :callback

    elsif method_defined?(:begin_db_transaction)
      def begin_db_transaction_with_callback(*args, &block)
        # @disable_rollback is set to false at the start of the
        # outermost call to #transaction.  After committing, it is
        # set to true to prevent exceptions causing a spurious
        # rollback.
        outermost_call = @disable_rollback.nil?
        @disable_rollback = false if outermost_call
        begin_db_transaction_without_callback(*args, &block)
      ensure
        @disable_rollback = nil if outermost_call
      end
      alias_method_chain :begin_db_transaction, :callback
    end

    # The commit_db_transaction method gets called when the outermost
    # transaction finishes and everything inside commits. We want to
    # override it so that after this happens, any records that were saved
    # or destroyed within this transaction now get their after_commit
    # callback fired.
    def commit_db_transaction_with_callback
      increment_transaction_pointer
      result    = nil
      begin
        trigger_before_commit_callbacks
        trigger_before_commit_on_create_callbacks
        trigger_before_commit_on_update_callbacks
        trigger_before_commit_on_save_callbacks
        trigger_before_commit_on_destroy_callbacks

        result = commit_db_transaction_without_callback
        @disable_rollback = true

        trigger_after_commit_callbacks
        trigger_after_commit_on_create_callbacks
        trigger_after_commit_on_update_callbacks
        trigger_after_commit_on_save_callbacks
        trigger_after_commit_on_destroy_callbacks
        result
      rescue
        # Need to decrement the transaction pointer before calling
        # rollback... to ensure it is not incremented twice
        unless @disable_rollback
          decrement_transaction_pointer
          @already_decremented = true
        end
        
        # We still want to raise the exception.
        raise
      ensure
        AfterCommit.cleanup(self)
        decrement_transaction_pointer unless @already_decremented
      end
    end
    alias_method_chain :commit_db_transaction, :callback

    # In the event the transaction fails and rolls back, nothing inside
    # should recieve the after_commit callback, but do fire the after_rollback
    # callback for each record that failed to be committed.
    def rollback_db_transaction_with_callback
      return if @disable_rollback
      increment_transaction_pointer
      begin
        result = nil
        trigger_before_rollback_callbacks
        result = rollback_db_transaction_without_callback
        trigger_after_rollback_callbacks
        result
      ensure
        AfterCommit.cleanup(self)
        decrement_transaction_pointer
      end
      decrement_transaction_pointer
    end
    alias_method_chain :rollback_db_transaction, :callback
    
    def unique_transaction_key
      [object_id, transaction_pointer]
    end
    
    def old_transaction_key
      [object_id, transaction_pointer - 1]
    end
    
    protected
    
    def trigger_before_commit_callbacks
      AfterCommit.records(self).each do |record|
        record.send :callback, :before_commit
      end 
    end

    def trigger_before_commit_on_create_callbacks
      AfterCommit.created_records(self).each do |record|
        record.send :callback, :before_commit_on_create
      end 
    end
  
    def trigger_before_commit_on_update_callbacks
      AfterCommit.updated_records(self).each do |record|
        record.send :callback, :before_commit_on_update
      end 
    end
  
    def trigger_before_commit_on_save_callbacks
      AfterCommit.saved_records(self).each do |record|
        record.send :callback, :before_commit_on_save
      end
    end
    
    def trigger_before_commit_on_destroy_callbacks
      AfterCommit.destroyed_records(self).each do |record|
        record.send :callback, :before_commit_on_destroy
      end 
    end

    def trigger_before_rollback_callbacks
      AfterCommit.records(self).each do |record|
        record.send :callback, :before_rollback
      end 
    end

    def trigger_after_commit_callbacks
      # Trigger the after_commit callback for each of the committed
      # records.
      AfterCommit.records(self).each do |record|
        record.send :callback, :after_commit
      end
    end
        
    def trigger_after_commit_on_create_callbacks
      # Trigger the after_commit_on_create callback for each of the committed
      # records.
      AfterCommit.created_records(self).each do |record|
        record.send :callback, :after_commit_on_create
      end
    end
  
    def trigger_after_commit_on_update_callbacks
      # Trigger the after_commit_on_update callback for each of the committed
      # records.
      AfterCommit.updated_records(self).each do |record|
        record.send :callback, :after_commit_on_update
      end
    end
  
    def trigger_after_commit_on_save_callbacks
      # Trigger the after_commit_on_save callback for each of the committed
      # records.
      AfterCommit.saved_records(self).each do |record|
        record.send :callback, :after_commit_on_save
      end
    end
    
    def trigger_after_commit_on_destroy_callbacks
      # Trigger the after_commit_on_destroy callback for each of the committed
      # records.
      AfterCommit.destroyed_records(self).each do |record|
        record.send :callback, :after_commit_on_destroy
      end
    end

    def trigger_after_rollback_callbacks
      # Trigger the after_rollback callback for each of the committed
      # records.
      AfterCommit.records(self).each do |record|
        record.send :callback, :after_rollback
      end 
    end
    
    def transaction_pointer
      Thread.current[:after_commit_pointer] ||= 0
    end
    
    def increment_transaction_pointer
      Thread.current[:after_commit_pointer] ||= 0
      Thread.current[:after_commit_pointer] += 1
    end
    
    def decrement_transaction_pointer
      Thread.current[:after_commit_pointer] ||= 0
      Thread.current[:after_commit_pointer] -= 1
    end

  end 
end