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    • George Kiagiadakis's avatar
    • George Kiagiadakis's avatar
      lib: introduce WpObjectManager · e7e5c668
      George Kiagiadakis authored
      * rework how global objects are stored in the core
      * rework how users get notified about global objects
        and proxies of remote global objects
      
      The purpose of this change is to have a class that can manage
      objects that are registered in the core or signalled through the
      registry. This object can declare interest on certain types
      of global objects and only keep & signal those objects that it is
      interested in. Additionally, it can prepare proxy features and
      asynchronously deliver an 'objects-changed' signal, which is
      basically telling us that the list of objects has changed.
      
      This is useful to simplify port proxies management in WpAudioStream.
      Now the stream object can declare that it is interested in ports
      that have "node.id" == X and the object manager will only maintain
      a list of those. Additionally, it will emit the 'objects-changed'
      signal when the list of ports is complete, so there is no reason to
      do complex operations and core syncs in the WpAudioStream class
      in order to figure out when the list of ports is ready.
      
      As a side effect, this also reduces resource management. Now we
      don't construct a WpProxy for every global that pipewire reports;
      we only construct proxies when there is interest in them!
      
      Another interesting side effect is that we can now register an
      object manager at any point in time and get immediately notified
      about remote globals that already exist. i.e. when you register
      an object manager that is interested in nodes, it will be immediately
      notified about all the existing nodes in the graph. This is useful
      to avoid race conditions between connecting the signal and objects
      beting created in pipewire
      e7e5c668