MessageQueue.h

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/*
 * MessageQueue.h
 * 
 * Smalltalk like class library for C++
 * Message queue accessor. Header.
 *
 * Copyright (c) 2003 Martin Dvorak, Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __MESSAGEQUEUE_H
#define __MESSAGEQUEUE_H

#include <stlib/IOAccessor.h>

namespace OS {

class Core::ByteArray;
class Core::String;

class MessageQueue : public Core::IOAccessor
{
  protected:
    int queueid;
    int queueCreationKey;
    bool active;
    int _priority;

  public:
    MessageQueue(int queueKey, bool exclusive);

    static MessageQueue *open(void);
    static MessageQueue *open(String *key, bool exclusive = false);
    static MessageQueue *open(bool exclusive);

    /* Accessing protocol */
    virtual long bufferSize(void);
    virtual long priority(void);
    virtual void priority(long level);

    virtual void close(void);

    virtual int key(void)
      { return queueCreationKey; }

    /* Data transfer protocol */
    virtual int readInto(ByteArray *buffer, long startIndex, long count);
    virtual int writeFrom(ByteArray *buffer, long startIndex, long count);

    /* Positioning protocol */
    virtual void seekTo(long position);

    /* Testing protocol */
    virtual bool isActive(void)
      { return active; }
};

};

#endif /* __MESSAGEQUEUE_H */

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