//
// Copyright (C) 2011 United States Government as represented by the
// Administrator of the National Aeronautics and Space Administration
// (NASA). All Rights Reserved.
//
// This software is distributed under the NASA Open Source Agreement
// (NOSA), version 1.3. The NOSA has been approved by the Open Source
// Initiative. See the file NOSA-1.3-JPF at the top of the distribution
// directory tree for the complete NOSA document.
//
// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
//
package gov.nasa.jpf.vm;
/**
* interface that encapsulates the mechanism to obtain values for
*
* System.getCurrentTimeMillis()
* System.nanoTime()
*
* calls. Implementors should guarantee the invariant that time values are
* strictly increasing along any given path, but don't have to backtrack
* time values in order to achieve uniform time increments along all paths.
*
* Note that implementations have to avoid creating state leaks, i.e.
* the respective time value storage should not contribute to the state space
* hashing. If it has to be backtrackable, it either has to be stored on the
* native side, or marked as @FilterField
*/
public interface TimeModel {
public long currentTimeMillis();
public long nanoTime();
}