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annotate OrthancStone/Sources/Loaders/ILoadersContext.h @ 1652:fa9e6bf84958

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integrating pdf.js into Stone Web viewer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 16 Nov 2020 20:47:53 +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
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #pragma once
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24
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25 #include "../Messages/IObserver.h"
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26 #include "../Messages/IObservable.h"
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27 #include "../Oracle/IOracleCommand.h"
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29 #include <boost/shared_ptr.hpp>
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30
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31 namespace OrthancStone
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32 {
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33 class ILoadersContext : public boost::noncopyable
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34 {
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35 public:
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36 class ILock : public boost::noncopyable
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37 {
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38 public:
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39 virtual ~ILock()
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40 {
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41 }
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42
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43 /**
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44 * This method is useful for loaders that must be able to
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45 * re-lock the Stone loaders context in the future (for instance
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46 * to schedule new commands once some command is processed).
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47 **/
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48 virtual ILoadersContext& GetContext() const = 0;
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49
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50 /**
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51 * Get a reference to the observable against which a loader must
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52 * listen to be informed of messages issued by the oracle once
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53 * some command is processed.
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54 **/
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55 virtual IObservable& GetOracleObservable() const = 0;
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56
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57 /**
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58 * Schedule a new command for further processing by the
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59 * oracle. The "receiver" argument indicates to which object the
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60 * notification messages are sent by the oracle upon completion
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61 * of the command. The command is possibly not directly sent to
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62 * the oracle: Instead, an internal "OracleScheduler" object is
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63 * often used as a priority queue to rule the order in which
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64 * commands are actually sent to the oracle. Hence the
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65 * "priority" argument (commands with lower value are executed
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66 * first).
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67 **/
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68 virtual void Schedule(boost::shared_ptr<IObserver> receiver,
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69 int priority,
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70 IOracleCommand* command /* Takes ownership */) = 0;
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71
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72 /**
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73 * Cancel all the commands that are waiting in the
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74 * "OracleScheduler" queue and that are linked to the given
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75 * receiver (i.e. the observer that was specified at the time
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76 * method "Schedule()" was called). This is useful for real-time
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77 * processing, as it allows to replace commands that were
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78 * scheduled in the past by more urgent commands.
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79 *
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80 * Note that this call does not affect commands that would have
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81 * already be sent to the oracle. As a consequence, the receiver
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82 * might still receive messages that were sent to the oracle
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83 * before the cancellation (be prepared to handle such
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84 * messages).
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85 **/
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86 virtual void CancelRequests(boost::shared_ptr<IObserver> receiver) = 0;
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87
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88 /**
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89 * Same as "CancelRequests()", but targets all the receivers.
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90 **/
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91 virtual void CancelAllRequests() = 0;
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92
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93 /**
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94 * Add a reference to the given observer in the Stone loaders
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95 * context. This can be used to match the lifetime of a loader
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96 * with the lifetime of the Stone context: This is useful if
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97 * your Stone application does not keep a reference to the
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98 * loader by itself (typically in global promises), which would
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99 * make the loader disappear as soon as the scope of the
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100 * variable is left.
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101 **/
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102 virtual void AddLoader(boost::shared_ptr<IObserver> loader) = 0;
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103
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104 /**
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105 * Returns the number of commands that were scheduled and
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106 * processed using the "Schedule()" method. By "processed"
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107 * commands, we refer to the number of commands that were either
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108 * executed by the oracle, or canceled by the user. So the
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109 * counting sequences are monotonically increasing over time.
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110 **/
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111 virtual void GetStatistics(uint64_t& scheduledCommands,
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112 uint64_t& processedCommands) = 0;
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113 };
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114
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115 virtual ~ILoadersContext()
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116 {
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117 }
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118
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119 /**
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120 * Locks the Stone loaders context, to give access to its
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121 * underlying features. This is important for Stone applications
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122 * running in a multi-threaded environment, for which a global
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123 * mutex is locked.
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124 **/
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125 virtual ILock* Lock() = 0;
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126 };
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127 }