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// download_thread -*-c++-*-
//
// Copyright (C) 2005, 2008-2009 Daniel Burrows
//
// 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.
//
// This program 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 this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#ifndef DOWNLOAD_THREAD_H
#define DOWNLOAD_THREAD_H
#include <aptitude.h>
#include <apt-pkg/acquire.h>
#include <apt-pkg/error.h>
#include <cwidget/generic/threads/threads.h>
#include <generic/util/safe_slot.h>
#include <sigc++/slot.h>
#include <boost/shared_ptr.hpp>
/** \file download_thread.h
*/
class download_manager;
class download_signal_log;
/** \brief The type of a callback that posts a thunk to the
* main thread.
*
* We use a function pointer and not a slot to avoid any unexpected
* problems with slots and threads.
*/
typedef void (*post_thunk_func)(const safe_slot0<void> &thunk);
/** A proxy status object that posts messages to the main thread.
* Each message "blocks" the download until the user deals with it,
* just as if it was running in the main thread (I'm not sure
* anything else is safe).
*
* This object does NOT own the encapsulated status object and will
* NOT delete it.
*/
class background_status : public pkgAcquireStatus
{
download_signal_log *real_status;
post_thunk_func post_thunk;
public:
void Fetched(unsigned long long Size, unsigned long long ResumePoint);
bool MediaChange(std::string Media, std::string Drive);
void IMSHit(pkgAcquire::ItemDesc &);
void Fetch(pkgAcquire::ItemDesc &);
void Done(pkgAcquire::ItemDesc &);
void Fail(pkgAcquire::ItemDesc &);
bool Pulse(pkgAcquire *Owner);
void Start();
void Stop();
void Complete();
/** \brief Create a background-status object.
*
* This should be created in the foreground thread.
*
* \param _real_status The status object that will be used to
* broadcast messages in the foreground thread.
*
* \param _post_thunk How to schedule a thunk for execution in the
* foreground thread.
*/
background_status(download_signal_log *_real_status,
post_thunk_func _post_thunk)
: real_status(_real_status),
post_thunk(_post_thunk)
{
}
};
/** The thread that performs the download. */
class download_thread
{
cwidget::threads::box<bool> cancelled;
/** A callback that posts thunks to be run in the main thread. */
post_thunk_func post_thunk;
/** The bundled download_manager object. It should have been
* initialized using a background_status wrapper as above, and you
* should join() this thread before deleting it. (it is also OK
* to join() the thread first thing in the object's destructor)
*/
boost::shared_ptr<download_manager> m;
/** The continuation of this download, invoked in the main thread
* with this thread and the result of the run as parameters. The
* thread will be automatically join()ed before the continuation is
* deleted.
*/
safe_slot2<void, download_thread *, pkgAcquire::RunResult> continuation;
cwidget::threads::thread *t;
download_thread(const download_thread &other);
download_thread &operator=(const download_thread &other);
public:
download_thread(const boost::shared_ptr<download_manager> &manager,
post_thunk_func _post_thunk,
const safe_slot2<void, download_thread *, pkgAcquire::RunResult> &_continuation)
: cancelled(false), post_thunk(_post_thunk),
m(manager), continuation(_continuation), t(NULL)
{
}
~download_thread()
{
delete t;
}
void operator()();
void start()
{
if(t != NULL)
_error->Error(_("Attempt to start a download thread twice!"));
else
t = new cwidget::threads::thread(cwidget::threads::noncopy_bootstrap<download_thread>(*this));
}
void join()
{
t->join();
}
};
#endif // DOWNLOAD_THREAD_H
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