ServerPlugin

Base class to extend in order to create the server-side counterpart of a soundworks plugin.

In the soundworks paradigm, a plugin is a component that allows to extend the framework capabilities by encapsulating common and reusable logic in an application wise perspective. For example, plugins are available to handle clock synchronization, to deal with the file system, etc. Plugin should always have both a client-side and a server-side part.

See https://soundworks.dev/guide/ecosystem for more information on the available plugins.

Creating new plugins should be considered an advanced usage.

Extends

Constructor

new ServerPlugin(server, id)

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Parameters:
Name Type Description
server Server

The soundworks server instance.
id string

User defined id of the plugin as defined in ServerPluginManager#register.

Attributes

clients :Set.<ServerClient>

Description:

  • Set of the clients registered in the plugin.

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(readonly) id :string

Description:

  • User defined ID of the plugin.

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server :Server

Description:

  • Instance of soundworks server.

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(protected) state :object

Description:

  • Placeholder that stores internal (local) state of the plugin. The state should be modified through the propagateStateChange method to ensure the change to be properly propagated to manager onStateChange callbacks.

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status :'idle'|'inited'|'started'|'errored'

Description:

  • Current status of the plugin.

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(readonly) type :string

Description:

  • Type of the plugin, i.e. the ClassName.

    Useful to do perform some logic based on certain types of plugins without knowing under which id they have been registered. (e.g. creating some generic views, etc.)

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Methods

(async) addClient(client)

Description:

  • Method called when a client (which registered the client-side plugin), connects to the application. Override this method if you need to perform some particular logic (e.g. creating a shared state) for each clients.

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Parameters:
Name Type Description
client ServerClient

onStateChange(callback) → {pluginDeleteOnStateChangeCallback}

Description:

  • Listen to the state changes propagated by BasePlugin.propagateStateChange

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Example
const unsubscribe = plugin.onStateChange(pluginState => console.log(pluginState));
// stop listening state changes
unsubscribe();
Parameters:
Name Type Description
callback pluginOnStateChangeCallback

Callback to execute when a state change is propagated.
Returns:
Type
pluginDeleteOnStateChangeCallback

propagateStateChange(updates)

Description:

  • Apply updates to the plugin state and propagate the updated state to the onStateChange listeners. The state changes will also be propagated through the PluginManager#onStateChange listeners.

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Parameters:
Name Type Description
updates object

Updates to be merged in the plugin state.

(async) removeClient(client)

Description:

  • Method called when a client (which registered the client-side plugin), disconnects from the application. Override this method if you need to perform some particular logic (e.g. creating a shared state) for each clients.

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Parameters:
Name Type Description
client ServerClient

(async) start()

Description:

  • Start the plugin.

    This method is automatically called during the client or server init() lifecycle step. After start() is fulfilled the plugin should be ready to use.

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Example
// server-side counterpart of a plugin that creates a dedicated global shared
// state on which the server-side part can attach.
class MyPlugin extends ServerPlugin {
  constructor(server, id) {
    super(server, id);

    this.server.stateManager.defineClass(`my-plugin:${this.id}`, {
      someParam: {
        type: 'boolean',
        default: false,
      },
      // ...
    });
  }

  async start() {
    await super.start()
    this.sharedState = await this.server.stateManager.create(`my-plugin:${this.id}`);
  }

  async stop() {
    await this.sharedState.delete();
  }
}

(async) stop()

Description:

  • Stop the plugin.

    This method is automatically called during the client or server stop() lifecycle step.

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Example
// server-side counterpart of a plugin that creates a dedicated global shared
// state on which the client-side part can attach.
class MyPlugin extends ServerPlugin {
  constructor(server, id) {
    super(server, id);

    this.server.stateManager.defineClass(`my-plugin:${this.id}`, {
      someParam: {
        type: 'boolean',
        default: false,
      },
      // ...
    });
  }

  async start() {
    await super.start()
    this.sharedState = await this.server.stateManager.create(`my-plugin:${this.id}`);
    this.sharedState.onUpdate(updates => this.doSomething(updates));
  }

  async stop() {
    await this.sharedState.delete();
  }
}