79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* ActionQueue.h
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* Interface for the ActionQueue class.
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* Copyright (C) 2005-2010 Simon Newton
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*
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* An ActionQueue allows Actions to be queued up and the executed
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* asynchronously. Perform(on_done) is called on each action in turn and an
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* action calls on_done when it's completed.
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*/
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#ifndef INCLUDE_OLA_ACTIONQUEUE_H_
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#define INCLUDE_OLA_ACTIONQUEUE_H_
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#include <vector>
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#include "ola/Callback.h"
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#include "ola/Closure.h"
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namespace ola {
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/*
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* The base action class
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*/
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class Action {
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public:
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Action() {}
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virtual ~Action() {}
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// returns true if the failure of this action causes aborts the entire
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// chain.
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virtual bool IsFatal() const = 0;
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virtual bool Failed() const = 0;
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virtual void Perform(SingleUseClosure<void> *on_done) = 0;
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};
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/*
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* An Action Queue. Action objects can be added to the queue and are then run
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* sequentially.
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*/
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class ActionQueue {
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public:
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ActionQueue(SingleUseCallback1<void, ActionQueue*> *on_complete):
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m_on_complete(on_complete),
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m_action_index(-1),
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m_success(true) {
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}
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~ActionQueue();
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void AddAction(Action *action);
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void NextAction();
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bool WasSuccessful() const { return m_success; }
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unsigned int ActionCount() const { return m_actions.size(); }
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Action *GetAction(unsigned int i);
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private:
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SingleUseCallback1<void, ActionQueue*> *m_on_complete;
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std::vector<Action*> m_actions;
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int m_action_index;
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bool m_success;
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};
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} // ola
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#endif // INCLUDE_OLA_ACTIONQUEUE_H_
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