view data/fileio/FileReadThread.h @ 1671:82d03c9661f9 single-point

Rework isReady()/getCompletion() on models. Previously the new overhauled models were implementing getCompletion() but inheriting a version of isReady() (from the Model base) that didn't call it, referring only to isOK(). So they were reporting completion as soon as they had begun. Instead hoist getCompletion() to abstract base and call it from Model::isReady().

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef SV_FILE_READ_THREAD_H
#define SV_FILE_READ_THREAD_H

#include "base/Thread.h"

#include <QMutex>
#include <QWaitCondition>

#include <map>
#include <set>

#include <stdint.h>

class FileReadThread : public Thread
{
    Q_OBJECT

public:
    FileReadThread();

    void run() override;
    virtual void finish();

    struct Request {
        int fd;
        QMutex *mutex; // used to synchronise access to fd; may be null
        off_t start;
        size_t size;
        char *data; // caller is responsible for allocating and deallocating
        bool successful; // set by FileReadThread after processing request
    };
    
    virtual int request(const Request &request);
    virtual void cancel(int token);

    virtual bool isReady(int token);
    virtual bool isCancelled(int token); // and safe to delete
    virtual bool haveRequest(int token);
    virtual bool getRequest(int token, Request &request);
    virtual void done(int token);
    
protected:
    int m_nextToken;
    bool m_exiting;
    
    typedef std::map<int, Request> RequestQueue;
    RequestQueue m_queue;
    RequestQueue m_cancelledRequests;
    RequestQueue m_readyRequests;
    std::set<int> m_newlyCancelled;

    QMutex m_mutex;
    QWaitCondition m_condition;

    void process();
    void notifyCancelled();
};

#endif