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annotate OrthancStone/Sources/Loaders/ILoadersContext.h @ 1871:7053b8a0aaec

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:18:48 +0100
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
1871
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #pragma once
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25
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26 #include "../Messages/IObserver.h"
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27 #include "../Messages/IObservable.h"
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28 #include "../Oracle/IOracleCommand.h"
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29
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30 #include <boost/shared_ptr.hpp>
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31
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32 namespace OrthancStone
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33 {
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34 class ILoadersContext : public boost::noncopyable
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35 {
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36 public:
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37 class ILock : public boost::noncopyable
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38 {
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39 public:
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40 virtual ~ILock()
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41 {
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42 }
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43
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44 /**
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45 * This method is useful for loaders that must be able to
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46 * re-lock the Stone loaders context in the future (for instance
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47 * to schedule new commands once some command is processed).
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48 **/
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49 virtual ILoadersContext& GetContext() const = 0;
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50
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51 /**
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52 * Get a reference to the observable against which a loader must
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53 * listen to be informed of messages issued by the oracle once
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54 * some command is processed.
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55 **/
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56 virtual IObservable& GetOracleObservable() const = 0;
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57
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58 /**
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59 * Schedule a new command for further processing by the
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60 * oracle. The "receiver" argument indicates to which object the
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61 * notification messages are sent by the oracle upon completion
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62 * of the command. The command is possibly not directly sent to
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63 * the oracle: Instead, an internal "OracleScheduler" object is
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64 * often used as a priority queue to rule the order in which
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65 * commands are actually sent to the oracle. Hence the
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66 * "priority" argument (commands with lower value are executed
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67 * first).
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68 **/
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69 virtual void Schedule(boost::shared_ptr<IObserver> receiver,
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70 int priority,
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71 IOracleCommand* command /* Takes ownership */) = 0;
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72
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73 /**
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74 * Cancel all the commands that are waiting in the
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75 * "OracleScheduler" queue and that are linked to the given
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76 * receiver (i.e. the observer that was specified at the time
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77 * method "Schedule()" was called). This is useful for real-time
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78 * processing, as it allows to replace commands that were
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79 * scheduled in the past by more urgent commands.
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80 *
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81 * Note that this call does not affect commands that would have
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82 * already be sent to the oracle. As a consequence, the receiver
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83 * might still receive messages that were sent to the oracle
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84 * before the cancellation (be prepared to handle such
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85 * messages).
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86 **/
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87 virtual void CancelRequests(boost::shared_ptr<IObserver> receiver) = 0;
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88
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89 /**
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90 * Same as "CancelRequests()", but targets all the receivers.
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91 **/
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92 virtual void CancelAllRequests() = 0;
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93
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94 /**
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95 * Add a reference to the given observer in the Stone loaders
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96 * context. This can be used to match the lifetime of a loader
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97 * with the lifetime of the Stone context: This is useful if
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98 * your Stone application does not keep a reference to the
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99 * loader by itself (typically in global promises), which would
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100 * make the loader disappear as soon as the scope of the
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101 * variable is left.
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102 **/
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103 virtual void AddLoader(boost::shared_ptr<IObserver> loader) = 0;
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104
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105 /**
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106 * Returns the number of commands that were scheduled and
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107 * processed using the "Schedule()" method. By "processed"
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108 * commands, we refer to the number of commands that were either
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109 * executed by the oracle, or canceled by the user. So the
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110 * counting sequences are monotonically increasing over time.
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111 **/
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112 virtual void GetStatistics(uint64_t& scheduledCommands,
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113 uint64_t& processedCommands) = 0;
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114 };
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115
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116 virtual ~ILoadersContext()
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117 {
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118 }
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119
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120 /**
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121 * Locks the Stone loaders context, to give access to its
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122 * underlying features. This is important for Stone applications
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123 * running in a multi-threaded environment, for which a global
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124 * mutex is locked.
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125 **/
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126 virtual ILock* Lock() = 0;
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127 };
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128 }