JobScheduler.h

/*
 *  JobScheduler class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2015, IRIT UPS.
 *
 *  OTAWA 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.
 *
 *  OTAWA 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with OTAWA; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_SYS_JOBSCHEDULER_H_
#define ELM_SYS_JOBSCHEDULER_H_

#include <elm/sys/Thread.h>

namespace elm { namespace sys {

class Job: public Runnable {
};

class JobProducer {
public:
    virtual ~JobProducer(void) { }
    virtual Job *next(void) = 0;
    virtual void harvest(Job *job) { }
};

template <class T, class I>
class IteratorProducer: public JobProducer {
public:
    IteratorProducer(const I& iter): i(iter) { }
    virtual Job *next(void) { if(i.ended()) return 0; else { T *r = i.item(); i.next(); return r; } }
    virtual void harvest(Job *job) { harvest(static_cast<T *>(job)); }
    virtual void harvest(T *job) { }
private:
    I i;
};

class JobScheduler: private Runnable {
public:
    JobScheduler(void) throw(SystemException);
    JobScheduler(JobProducer& producer) throw(SystemException);
    ~JobScheduler(void);

    // accessors
    inline JobProducer& producer(void) const { return *prod; }
    void setProducer(JobProducer& producer);
    inline int threadCount(void) const { return cnt; }
    void setThreadCount(int count);

    // commands
    void start(void);
    void stop(void);

private:
    void init(void) throw(SystemException);
    virtual void run(void);
    JobProducer *prod;
    Mutex *mutex;
    int cnt;
    Thread **thds;
    enum {
        WAIT = 0,
        RUN = 1,
        STOP = 2,
        EXN = 3
    } state;
    string err;
};

} } // elm::sys

#endif /* ELM_SYS_JOBSCHEDULER_H_ */