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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210  #ifndef RESOURCE_SET_H #define RESOURCE_SET_H #include #include #include #include #include /** * \mainpage Resource Policy Library * * \section intro_section Introduction * * This library is used to request resources from the Polict Resource Manager. * To use this library two classes are provided: \ref ResourcePolicy::Resource and * \ref ResourcePolicy::ResourceSet. * * \section library_use_section Library Usage * * To use the Resource Policy Library, you first need to create a number of * \ref Resource objects like this (given as an example of what a media player * might want/need): * \code * ResourcePolicy::AudioResource *audioResource = new ResourcePolicy::AudioResource(); * ResourcePolicy::VideoResource *audioResource = new ResourcePolicy::VideoResource(); * videoResource->setOptional(); * \endcode * Then you need to create a \ref ResourcePolicy::ResourceSet like this: * \code * ResourcePolicy::ResourceSet *resources = new ResourcePolicy::ResourceSet("player"); * resources->addResource(audioResource); * resources->addResource(videoResource); * resources->initialize(); * QObject::connect(resources, SIGNAL(connectedToManager()), this, SLOT(connectedHandler())); * resources->connectToManager(); * \endcode * Then the when you want to acquire the \ref ResourcePolicy::ResourceSet you simply use the * \ref acquire() method of the \ref ResourceSet object, like this: * \code * QObject::connect(resources, SIGNAL(resourcesAcquired), * this, SLOT(acquireOkHandler(QList))); * QObject::connect(resources, SIGNAL(resourcesDenied), this, SLOT(acquireDeniedHandler())); * resources->acquire(); * \endcode */ /** * The Namespace for Resource Policy. */ namespace ResourcePolicy { /** * The resourceSet repesents a set of attributes. Each set can only contain * a single Resource of a given type. That is one AudioPlaybackResource, etc. * * Internally the set is stored as a QVector of \ref Resource objects. */ class ResourceSet: public QObject { Q_OBJECT Q_DISABLE_COPY(ResourceSet) public: /** * The constructor. * \param applicationClass This parameter defines the application class. * The application class is used to determine the priority order of the * application. * \param parent The optional parent of of this class. */ ResourceSet(const QString &applicationClass, QObject *parent = NULL); /** * The destructor */ ~ResourceSet(); /** * Finalizes the ResourceSet. This method should be called after all * resources have been added to the set. * \return true if the finalization was successful. */ bool finalize(); /** * This method adds a resource to the set. A set contains only a single * instance of a given resource. If the ResourceSet already contains a * resource of the given type it will be overridden. * \param resource The resource to add to the set. A copy of this object * is stored in the Set. */ void addResource(const Resource *resource); /** * This method adds all resources in the list to the set. * A set contains only a single instance of a given resource. If the * ResourceSet already contains a resource of the given type it will be * overridden. * \param resources The list of resources to add to the set. These will * be copied. */ void addResources(const QListresources); /** * This method removes the resource of the given type * \param type The type of the resource to remove from the set. */ void deleteResource(ResourceType type); /** * This method returns a list of all resource in the set. * \return a QList of all resources in the set. */ QList resources() const; /** * This method returns a const pointer to a resource of a specific type. * \type The type of resource we are interested in. * \return a pointer to the Resource if it is defined NULL otherwise. */ Resource * resource(ResourceType type) const; /** * Checks if the \ref ResourceSet contains the given \ref Resource * \param type The Resource to look for * \return true if the \ref Resource is defined in this \ref ResourceSet */ bool contains(ResourceType type) const; /** * Checks if the \ref ResourceSet contains all given resources. * \param types A list of resources to check for * \return true if \b all given resources are defined in the ResourceSet. */ bool contains(const QList &types) const; /** * Returns the unique identifier for this ResourceSet. * @return the unique identifier for this ResourceSet. */ quint32 id() const; /** * Returns the registered application class (given in the constructor). */ QString applicationClass(); /** * Try to acquire the \ref ResourceSet. The resourcesGranted() or * resourcesDenied() signal will be emited depending on whether the * requested resources could be acquired or not. */ bool acquire(); /** * Release the acquired resources. */ bool release(); /** * Commit changes to the \ref ResourceSet. Remember to call update() * after adding and/or removing resources. */ bool update(); /** * Stes the auto-release. When loosing the resources doue to another * application with a higher priority the default is that we automatically * re-gain our resources without having to re-request them. However if * the AutoRelease is set we release the resources and need to re-acquire * them, when the pre-emting application releases it s resources. * This feature is by default disabled. * Remember to call update() when changing this. */ void setAutoRelease(); /** * Sets that the resourcesGranted() signal is emited even if we already * have the requested resources granted. By default this feature is off. */ void setAlwaysReply(); signals: /** * This signal is emited when the Resource Policy Manager notifies that * the given resources have become available. * \param availableResources A list of available resources. The list of * available resources contains only available resource which we have in the set. */ void resourcesBecameAvailable(const QList &availableResources); /** * This signal is emited as a response to the acquire() request. * \param grantedOptionalResources The list of granted optional resources. * All the mandatory resources have also been aquired. */ void resourcesGranted(const QList &grantedOptionalResources); /** * This signal is emited as a response to the acquire() request, in the * case where one or more of the mandatroy resources were not availalble. */ void resourcesDenied(); /** * This signal is emited when some other program with a higher priority * superseeds us, and as a result we loose our resources. */ void lostResources(); private: quint32 identifier; const QString resourceClass; Resource* resourceSet[NumberOfTypes]; bool connected; bool autoRelease; bool alwaysReply; }; } #endif