diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /remote/shared/messagehandler/MessageHandlerRegistry.sys.mjs | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'remote/shared/messagehandler/MessageHandlerRegistry.sys.mjs')
-rw-r--r-- | remote/shared/messagehandler/MessageHandlerRegistry.sys.mjs | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/remote/shared/messagehandler/MessageHandlerRegistry.sys.mjs b/remote/shared/messagehandler/MessageHandlerRegistry.sys.mjs new file mode 100644 index 0000000000..02a2514fee --- /dev/null +++ b/remote/shared/messagehandler/MessageHandlerRegistry.sys.mjs @@ -0,0 +1,238 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs"; + +import { EventEmitter } from "resource://gre/modules/EventEmitter.sys.mjs"; + +const lazy = {}; + +ChromeUtils.defineESModuleGetters(lazy, { + Log: "chrome://remote/content/shared/Log.sys.mjs", + readSessionData: + "chrome://remote/content/shared/messagehandler/sessiondata/SessionDataReader.sys.mjs", + RootMessageHandler: + "chrome://remote/content/shared/messagehandler/RootMessageHandler.sys.mjs", + WindowGlobalMessageHandler: + "chrome://remote/content/shared/messagehandler/WindowGlobalMessageHandler.sys.mjs", +}); + +XPCOMUtils.defineLazyGetter(lazy, "logger", () => lazy.Log.get()); + +/** + * Map of MessageHandler type to MessageHandler subclass. + */ +XPCOMUtils.defineLazyGetter( + lazy, + "MessageHandlerClasses", + () => + new Map([ + [lazy.RootMessageHandler.type, lazy.RootMessageHandler], + [lazy.WindowGlobalMessageHandler.type, lazy.WindowGlobalMessageHandler], + ]) +); + +/** + * Get the MessageHandler subclass corresponding to the provided type. + + * @param {string} type + * MessageHandler type, one of MessageHandler.type. + * @returns {Class} + * A MessageHandler subclass + * @throws {Error} + * Throws if no MessageHandler subclass is found for the provided type. + */ +export function getMessageHandlerClass(type) { + if (!lazy.MessageHandlerClasses.has(type)) { + throw new Error(`No MessageHandler class available for type "${type}"`); + } + return lazy.MessageHandlerClasses.get(type); +} + +/** + * The MessageHandlerRegistry allows to create and retrieve MessageHandler + * instances for different session ids. + * + * A MessageHandlerRegistry instance is bound to a specific MessageHandler type + * and context. All MessageHandler instances created by the same registry will + * use the type and context of the registry, but each will be associated to a + * different session id. + * + * The registry is useful to retrieve the appropriate MessageHandler instance + * after crossing a technical boundary (eg process, thread...). + */ +export class MessageHandlerRegistry extends EventEmitter { + /* + * @param {String} type + * MessageHandler type, one of MessageHandler.type. + * @param {Object} context + * The context object, which depends on the type. + */ + constructor(type, context) { + super(); + + this._messageHandlerClass = getMessageHandlerClass(type); + this._context = context; + this._type = type; + + /** + * Map of session id to MessageHandler instance + */ + this._messageHandlersMap = new Map(); + + this._onMessageHandlerDestroyed = + this._onMessageHandlerDestroyed.bind(this); + this._onMessageHandlerEvent = this._onMessageHandlerEvent.bind(this); + } + + /** + * Create all message handlers for the current context, based on the content + * of the session data. + * This should typically be called when the context is ready to be used and + * to receive/send commands. + */ + createAllMessageHandlers() { + const data = lazy.readSessionData(); + for (const [sessionId, sessionDataItems] of data) { + // Create a message handler for this context for each active message + // handler session. + // TODO: In the future, to support debugging use cases we might want to + // only create a message handler if there is relevant data. + // For automation scenarios, this is less critical. + this._createMessageHandler(sessionId, sessionDataItems); + } + } + + destroy() { + this._messageHandlersMap.forEach(messageHandler => { + messageHandler.destroy(); + }); + } + + /** + * Retrieve all MessageHandler instances held in this registry, for all + * session IDs. + * + * @returns {Iterable.<MessageHandler>} + * Iterator of MessageHandler instances + */ + getAllMessageHandlers() { + return this._messageHandlersMap.values(); + } + + /** + * Retrieve an existing MessageHandler instance matching the provided session + * id. Returns null if no MessageHandler was found. + * + * @param {string} sessionId + * ID of the session the handler is used for. + * @returns {MessageHandler=} + * A MessageHandler instance, null if not found. + */ + getExistingMessageHandler(sessionId) { + return this._messageHandlersMap.get(sessionId); + } + + /** + * Retrieve the MessageHandler instance registered for the provided session + * id. Will create and register a MessageHander if no instance was found. + * + * @param {string} sessionId + * ID of the session the handler is used for. + * @returns {MessageHandler} + * A MessageHandler instance. + */ + getOrCreateMessageHandler(sessionId) { + let messageHandler = this.getExistingMessageHandler(sessionId); + if (!messageHandler) { + messageHandler = this._createMessageHandler(sessionId); + } + + return messageHandler; + } + + /** + * Retrieve an already registered RootMessageHandler instance matching the + * provided sessionId. + * + * @param {string} sessionId + * ID of the session the handler is used for. + * @returns {RootMessageHandler} + * A RootMessageHandler instance. + * @throws {Error} + * If no root MessageHandler can be found for the provided session id. + */ + getRootMessageHandler(sessionId) { + const rootMessageHandler = this.getExistingMessageHandler( + sessionId, + lazy.RootMessageHandler.type + ); + if (!rootMessageHandler) { + throw new Error( + `Unable to find a root MessageHandler for session id ${sessionId}` + ); + } + return rootMessageHandler; + } + + toString() { + return `[object ${this.constructor.name}]`; + } + + /** + * Create a new MessageHandler instance. + * + * @param {string} sessionId + * ID of the session the handler will be used for. + * @param {Array<SessionDataItem>=} sessionDataItems + * Optional array of session data items to be applied automatically to the + * MessageHandler. + * @returns {MessageHandler} + * A new MessageHandler instance. + */ + _createMessageHandler(sessionId, sessionDataItems) { + const messageHandler = new this._messageHandlerClass( + sessionId, + this._context, + this + ); + + messageHandler.on( + "message-handler-destroyed", + this._onMessageHandlerDestroyed + ); + messageHandler.on("message-handler-event", this._onMessageHandlerEvent); + + messageHandler.applyInitialSessionDataItems(sessionDataItems); + + this._messageHandlersMap.set(sessionId, messageHandler); + + lazy.logger.trace( + `Created MessageHandler ${this._type} for session ${sessionId}` + ); + + return messageHandler; + } + + // Event handlers + + _onMessageHandlerDestroyed(eventName, messageHandler) { + messageHandler.off( + "message-handler-destroyed", + this._onMessageHandlerDestroyed + ); + messageHandler.off("message-handler-event", this._onMessageHandlerEvent); + this._messageHandlersMap.delete(messageHandler.sessionId); + + lazy.logger.trace( + `Unregistered MessageHandler ${messageHandler.constructor.type} for session ${messageHandler.sessionId}` + ); + } + + _onMessageHandlerEvent(eventName, messageHandlerEvent) { + // The registry simply re-emits MessageHandler events so that consumers + // don't have to attach listeners to individual MessageHandler instances. + this.emit("message-handler-registry-event", messageHandlerEvent); + } +} |