1 /* <!-- copyright */
2 /*
3  * aria2 - The high speed download utility
4  *
5  * Copyright (C) 2009 Tatsuhiro Tsujikawa
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  *
21  * In addition, as a special exception, the copyright holders give
22  * permission to link the code of portions of this program with the
23  * OpenSSL library under certain conditions as described in each
24  * individual source file, and distribute linked combinations
25  * including the two.
26  * You must obey the GNU General Public License in all respects
27  * for all of the code used other than OpenSSL.  If you modify
28  * file(s) with this exception, you may extend this exception to your
29  * version of the file(s), but you are not obligated to do so.  If you
30  * do not wish to do so, delete this exception statement from your
31  * version.  If you delete this exception statement from all source
32  * files in the program, then also delete it here.
33  */
34 /* copyright --> */
35 #ifndef D_SEQUENTIAL_DISPATCHER_COMMAND_H
36 #define D_SEQUENTIAL_DISPATCHER_COMMAND_H
37 
38 #include "Command.h"
39 
40 #include <memory>
41 
42 #include "SequentialPicker.h"
43 #include "DownloadEngine.h"
44 #include "RequestGroupMan.h"
45 
46 namespace aria2 {
47 
48 class DownloadEngine;
49 
50 template <typename T> class SequentialDispatcherCommand : public Command {
51 private:
52   SequentialPicker<T>* picker_;
53 
54   DownloadEngine* e_;
55 
56 protected:
getDownloadEngine()57   DownloadEngine* getDownloadEngine() const { return e_; }
58 
59 public:
SequentialDispatcherCommand(cuid_t cuid,SequentialPicker<T> * picker,DownloadEngine * e)60   SequentialDispatcherCommand(cuid_t cuid, SequentialPicker<T>* picker,
61                               DownloadEngine* e)
62       : Command{cuid}, picker_{picker}, e_{e}
63   {
64     setStatusRealtime();
65   }
66 
execute()67   virtual bool execute() CXX11_OVERRIDE
68   {
69     if (e_->getRequestGroupMan()->downloadFinished() || e_->isHaltRequested()) {
70       return true;
71     }
72     if (picker_->hasNext() && !picker_->isPicked()) {
73       e_->addCommand(createCommand(picker_->pickNext()));
74 
75       e_->setNoWait(true);
76     }
77 
78     e_->addRoutineCommand(std::unique_ptr<Command>(this));
79     return false;
80   }
81 
82 protected:
83   virtual std::unique_ptr<Command> createCommand(T* entry) = 0;
84 };
85 
86 } // namespace aria2
87 
88 #endif // D_SEQUENTIAL_DISPATCHER_COMMAND_H
89