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input/Plugin: add method scan() with asynchronous callback class 

To be used when a URL gets added.
This commit is contained in:
Max Kellermann 2018-01-26 16:06:41 +01:00
parent ec31e8df1d
commit 3e9c3c8ae8
3 changed files with 53 additions and 1 deletions
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1
Makefile.am
View File

@ -1327,6 +1327,7 @@ libinput_a_SOURCES = \
src/input/InputStream.cxx src/input/InputStream.hxx \
src/input/Ptr.hxx \
src/input/InputPlugin.hxx \
src/input/RemoteTagScanner.hxx \
src/input/Reader.cxx src/input/Reader.hxx \
src/input/TextInputStream.cxx src/input/TextInputStream.hxx \
src/input/ThreadInputStream.cxx src/input/ThreadInputStream.hxx \

14
src/input/InputPlugin.hxx
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@ -26,7 +26,8 @@ struct ConfigBlock;
class Mutex;
class Cond;
class EventLoop;
class InputStream;
class RemoteTagScanner;
class RemoteTagHandler;
struct InputPlugin {
const char *name;
@ -52,6 +53,17 @@ struct InputPlugin {
*/
InputStreamPtr (*open)(const char *uri,
Mutex &mutex, Cond &cond);
/**
* Prepare a #RemoteTagScanner. The operation must be started
* using RemoteTagScanner::Start().
*
* Throws on error.
*
* @return nullptr if the given URI is not supported.
*/
std::unique_ptr<RemoteTagScanner> (*scan_tags)(const char *uri,
RemoteTagHandler &handler) = nullptr;
};
#endif

39
src/input/RemoteTagScanner.hxx Normal file
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@ -0,0 +1,39 @@
/*
* Copyright 2003-2018 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_REMOTE_TAG_SCANNER_HXX
#define MPD_REMOTE_TAG_SCANNER_HXX
#include <exception>
struct Tag;
class RemoteTagHandler {
public:
virtual void OnRemoteTag(Tag &&tag) noexcept = 0;
virtual void OnRemoteTagError(std::exception_ptr e) noexcept = 0;
};
class RemoteTagScanner {
public:
virtual ~RemoteTagScanner() noexcept = default;
virtual void Start() = 0;
};
#endif