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// Copyright (c) 2002 Graz University of Technology. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. The end-user documentation included with the redistribution, if any, must
//    include the following acknowledgment:
//
//    "This product includes software developed by IAIK of Graz University of
//     Technology."
//
//    Alternately, this acknowledgment may appear in the software itself, if and
//    wherever such third-party acknowledgments normally appear.
//
// 4. The names "Graz University of Technology" and "IAIK of Graz University of
//    Technology" must not be used to endorse or promote products derived from
//    this software without prior written permission.
//
// 5. Products derived from this software may not be called "IAIK PKCS Wrapper",
//    nor may "IAIK" appear in their name, without prior written permission of
//    Graz University of Technology.
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package iaik.pkcs.pkcs11;

import sun.security.pkcs11.wrapper.PKCS11Exception;

/**
 * Objects that implement this interface can be used in the InitializeArgs to
 * handle mutex functionality.
 *
 * @author Karl Scheibelhofer
 * @version 1.0
 */
public interface MutexHandler {

  /**
   * Create a new mutex object.
   *
   * @return The new mutex object.
   * @exception PKCS11Exception
   *              If the wrapper should return a different value than CKR_OK
   *              to the library. It gets the error-code and returns it as
   *              CK_RV.
   */
  Object createMutex() throws PKCS11Exception;

  /**
   * Destroy a mutex object.
   *
   * @param mutex
   *          The mutex object to destroy.
   * @exception PKCS11Exception
   *              If the wrapper should return a different value than CKR_OK
   *              to the library. It gets the error-code and returns it as
   *              CK_RV.
   */
  void destroyMutex(Object mutex) throws PKCS11Exception;

  /**
   * If this method is called on with a mutex object which is not locked, the
   * calling thread obtains a lock on that mutex object and returns.
   * If this method is called with a mutex object which is locked by some
   * thread other than the calling thread, the calling thread blocks and waits
   * for that mutex to be unlocked.
   * If this method is called with a a mutex object which is locked by the
   + calling thread, the behavior of this method call is undefined.
   *
   * @param mutex
   *          The mutex object to lock.
   * @exception PKCS11Exception
   *              If the wrapper should return a different value than CKR_OK
   *              to the library. It gets the error-code and returns it as
   *              CK_RV.
   */
  void lockMutex(Object mutex) throws PKCS11Exception;

  /**
   * If this method is called with a mutex object which is locked by the
   * calling thread, that mutex object is unlocked and the function call
   * returns. Furthermore: If exactly one thread was blocking on that
   * particular mutex object, then that thread stops blocking, obtains a lock
   * on that mutex object, and its lockMutex(PKCS11Object) call returns.
   * If more than one thread was blocking on that particular mutex object,
   * then exactly one of the blocking threads is selected somehow. That lucky
   * thread stops blocking, obtains a lock on the mutex object, and its
   * lockMutex(PKCS11Object) call returns. All other threads blocking on that
   * particular mutex object continue to block.
   * If this method is called with a mutex object which is not locked, then
   * the method call throws an exception with the error code
   * PKCS11Constants.CKR_MUTEX_NOT_LOCKED.
   * If this method is called with a mutex object which is locked by some
   * thread other than the calling thread, the behavior of this method call is
   * undefined.
   *
   * @param mutex
   *          The mutex object to unlock.
   * @exception PKCS11Exception
   *              If the wrapper should return a different value than CKR_OK
   *              to the library. It gets the error-code and returns it as
   *              CK_RV.
   */
  void unlockMutex(Object mutex) throws PKCS11Exception;

}