QueueingRDMController.h

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/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * QueueingRDMController.h
 * A RDM Controller that sends a single message at a time.
 * Copyright (C) 2010 Simon Newton
 */

#ifndef INCLUDE_OLA_RDM_QUEUEINGRDMCONTROLLER_H_
#define INCLUDE_OLA_RDM_QUEUEINGRDMCONTROLLER_H_

#include <ola/rdm/RDMControllerInterface.h>
#include <queue>
#include <string>
#include <utility>
#include <vector>

namespace ola {
namespace rdm {

/*
 * A RDM controller that only sends a single request at a time. This also
 * handles timing out messages that we don't get a response for.
 */
class QueueingRDMController: public RDMControllerInterface {
 public:
 QueueingRDMController(RDMControllerInterface *controller,
 unsigned int max_queue_size);
 ~QueueingRDMController();

 void Pause();
 void Resume();

 // This can be called multiple times and the requests will be queued.
 void SendRDMRequest(const RDMRequest *request, RDMCallback *on_complete);

 protected:
 typedef struct {
 const RDMRequest *request;
 RDMCallback *on_complete;
 } outstanding_rdm_request;

 RDMControllerInterface *m_controller;
 unsigned int m_max_queue_size;
 std::queue<outstanding_rdm_request> m_pending_requests;
 bool m_rdm_request_pending; // true if a request is in progress
 bool m_active; // true if the controller is active
 RDMCallback *m_callback;
 const ola::rdm::RDMResponse *m_response;
 std::vector<std::string> m_packets;

 virtual void TakeNextAction();
 virtual bool CheckForBlockingCondition();
 void MaybeSendRDMRequest();
 void DispatchNextRequest();

 void HandleRDMResponse(rdm_response_code status,
 const ola::rdm::RDMResponse *response,
 const std::vector<std::string> &packets);
};


class DiscoverableQueueingRDMController: public QueueingRDMController {
 public:
 DiscoverableQueueingRDMController(
 DiscoverableRDMControllerInterface *controller,
 unsigned int max_queue_size);

 ~DiscoverableQueueingRDMController() {}

 // These can be called multiple times and the requests will be queued
 void RunFullDiscovery(RDMDiscoveryCallback *callback);
 void RunIncrementalDiscovery(RDMDiscoveryCallback *callback);

 private:
 typedef std::vector<RDMDiscoveryCallback*> DiscoveryCallbacks;
 typedef std::vector<std::pair<bool, RDMDiscoveryCallback*> >
 PendingDiscoveryCallbacks;

 DiscoverableRDMControllerInterface *m_discoverable_controller;
 DiscoveryCallbacks m_discovery_callbacks;
 PendingDiscoveryCallbacks m_pending_discovery_callbacks;

 void TakeNextAction();
 bool CheckForBlockingCondition();
 void GenericDiscovery(RDMDiscoveryCallback *callback, bool full);
 void StartRDMDiscovery();
 void DiscoveryComplete(const ola::rdm::UIDSet &uids);
};
} // namespace rdm
} // namespace ola
#endif // INCLUDE_OLA_RDM_QUEUEINGRDMCONTROLLER_H_