Method: PEROBS::Cache#cache_write

Defined in:
lib/perobs/Cache.rb

#cache_write(obj) ⇒ Object

Add a PEROBS::Object to the write cache.

Parameters:



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# File 'lib/perobs/Cache.rb', line 66

def cache_write(obj)
  # This is just a safety check. It can probably be disabled in the future
  # to increase performance.
  #if obj.respond_to?(:is_poxreference?)
  #  # If this condition triggers, we have a bug in the library.
  #  PEROBS.log.fatal "POXReference objects should never be cached"
  #end

  if @transaction_stack.empty?
    # We are not in transaction mode.
    idx = index(obj)
    if (old_obj = @writes[idx]) && old_obj._id != obj._id
      # There is another old object using this cache slot. Before we can
      # re-use the slot, we need to sync it to the permanent storage.
      old_obj._sync
    end
    @writes[idx] = obj
  else
    # When a transaction is active, we don't have a write cache. The read
    # cache is used to speed up access to recently used objects.
    cache_read(obj)
    # Push the reference of the modified object into the write buffer for
    # this transaction level.
    unless @transaction_stack.last.include?(obj._id)
      @transaction_stack.last << obj._id
      @transaction_objects[obj._id] = obj
    end
  end
end