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Иван Мажукин
mpd
Commits
e1e41708
Commit
e1e41708
authored
May 18, 2021
by
Max Kellermann
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input/LastInputStream: new class
parent
638dfc39
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3 changed files
with
132 additions
and
0 deletions
+132
-0
LastInputStream.cxx
src/input/LastInputStream.cxx
+45
-0
LastInputStream.hxx
src/input/LastInputStream.hxx
+86
-0
meson.build
src/input/meson.build
+1
-0
No files found.
src/input/LastInputStream.cxx
0 → 100644
View file @
e1e41708
/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "LastInputStream.hxx"
#include "InputStream.hxx"
#include <cassert>
LastInputStream
::
LastInputStream
(
EventLoop
&
event_loop
)
noexcept
:
close_timer
(
event_loop
,
BIND_THIS_METHOD
(
OnCloseTimer
))
{
}
LastInputStream
::~
LastInputStream
()
noexcept
=
default
;
void
LastInputStream
::
Close
()
noexcept
{
is
.
reset
();
close_timer
.
Cancel
();
}
void
LastInputStream
::
OnCloseTimer
()
noexcept
{
assert
(
is
);
is
.
reset
();
}
src/input/LastInputStream.hxx
0 → 100644
View file @
e1e41708
/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_LAST_INPUT_STREAM_HXX
#define MPD_LAST_INPUT_STREAM_HXX
#include "Ptr.hxx"
#include "thread/Mutex.hxx"
#include "event/TimerEvent.hxx"
#include <string>
/**
* A helper class which maintains an #InputStream that is opened once
* and may be reused later for some time. It will be closed
* automatically after some time.
*
* This class is not thread-safe. All methods must be called on the
* thread which runs the #EventLoop.
*/
class
LastInputStream
{
std
::
string
uri
;
Mutex
mutex
;
InputStreamPtr
is
;
TimerEvent
close_timer
;
public
:
explicit
LastInputStream
(
EventLoop
&
event_loop
)
noexcept
;
~
LastInputStream
()
noexcept
;
/**
* Open an #InputStream instance with the given opener
* function, but returns the cached instance if it matches.
*
* This object keeps owning the #InputStream; the caller shall
* not close it.
*/
template
<
typename
U
,
typename
O
>
InputStream
*
Open
(
U
&&
new_uri
,
O
&&
open
)
{
if
(
new_uri
==
uri
)
{
if
(
is
)
/* refresh the timeout */
ScheduleClose
();
return
is
.
get
();
}
is
.
reset
();
close_timer
.
Cancel
();
is
=
open
(
new_uri
,
mutex
);
uri
=
std
::
forward
<
U
>
(
new_uri
);
ScheduleClose
();
return
is
.
get
();
}
void
Close
()
noexcept
;
private
:
void
ScheduleClose
()
noexcept
{
close_timer
.
Schedule
(
std
::
chrono
::
seconds
(
20
));
}
void
OnCloseTimer
()
noexcept
;
};
#endif
src/input/meson.build
View file @
e1e41708
...
...
@@ -8,6 +8,7 @@ input_api = static_library(
'ThreadInputStream.cxx',
'AsyncInputStream.cxx',
'ProxyInputStream.cxx',
'LastInputStream.cxx',
include_directories: inc,
dependencies: [
boost_dep,
...
...
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