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//

//------------------------------------------------------------------------------

//   Copyright 2007-2010 Mentor Graphics Corporation

//   Copyright 2007-2010 Cadence Design Systems, Inc.

//   Copyright 2010 Synopsys, Inc.

//   All Rights Reserved Worldwide

//

//   Licensed under the Apache License, Version 2.0 (the

//   "License"); you may not use this file except in

//   compliance with the License.  You may obtain a copy of

//   the License at

//

//       http://www.apache.org/licenses/LICENSE-2.0

//

//   Unless required by applicable law or agreed to in

//   writing, software distributed under the License is

//   distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR

//   CONDITIONS OF ANY KIND, either express or implied.  See

//   the License for the specific language governing

//   permissions and limitations under the License.

//------------------------------------------------------------------------------

typedef class uvm_object;

typedef class uvm_event;

//------------------------------------------------------------------------------

//

// CLASS: uvm_event_callback

//

// The uvm_event_callback class is an abstract class that is used to create

// callback objects which may be attached to s. To use, you

// derive a new class and override any or both  and .

//

// Callbacks are an alternative to using processes that wait on events. When a

// callback is attached to an event, that callback object's callback function

// is called each time the event is triggered.

//

//------------------------------------------------------------------------------

virtual class uvm_event_callback#(type T=uvm_object) extends uvm_object;

  // Function: new

  //

  // Creates a new callback object.

  function new (string name="");

    super.new(name);

  endfunction

  // Function: pre_trigger

  //

  // This callback is called just before triggering the associated event.

  // In a derived class, override this method to implement any pre-trigger

  // functionality.

  //

  // If your callback returns 1, then the event will not trigger and the

  // post-trigger callback is not called. This provides a way for a callback

  // to prevent the event from triggering.

  //

  // In the function, ~e~ is the  that is being triggered, and ~data~

  // is the optional data associated with the event trigger.

  virtual function bit pre_trigger (uvm_event#(T) e, T data);

    return 0;

  endfunction

  // Function: post_trigger

  //

  // This callback is called after triggering the associated event.

  // In a derived class, override this method to implement any post-trigger

  // functionality.

  //

  //

  // In the function, ~e~ is the  that is being triggered, and ~data~

  // is the optional data associated with the event trigger.

  virtual function void post_trigger (uvm_event#(T) e, T data);

    return;

  endfunction

  virtual function uvm_object create (string name="");

    return null;

  endfunction

endclass