Quelle e10s.js Sprache: JAVA

/* 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/. */

"use strict";

// The prefix used for RDM messages in content.
// see: devtools/client/responsive/browser/content.js
const MESSAGE_PREFIX = "ResponsiveMode:";
const REQUEST_DONE_SUFFIX = ":Done";

/**
* Registers a message `listener` that is called every time messages of
* specified `message` is emitted on the given message manager.
* @param {nsIMessageListenerManager} mm
*    The Message Manager
* @param {String} message
*    The message. It will be prefixed with the constant `MESSAGE_PREFIX`
* @param {Function} listener
*    The listener function that processes the message.
*/
function on(mm, message, listener) {
  mm.addMessageListener(MESSAGE_PREFIX + message, listener);
}
exports.on = on;

/**
* Removes a message `listener` for the specified `message` on the given
* message manager.
* @param {nsIMessageListenerManager} mm
*    The Message Manager
* @param {String} message
*    The message. It will be prefixed with the constant `MESSAGE_PREFIX`
* @param {Function} listener
*    The listener function that processes the message.
*/
function off(mm, message, listener) {
  mm.removeMessageListener(MESSAGE_PREFIX + message, listener);
}
exports.off = off;

/**
* Resolves a promise the next time the specified `message` is sent over the
* given message manager.
* @param {nsIMessageListenerManager} mm
*    The Message Manager
* @param {String} message
*    The message. It will be prefixed with the constant `MESSAGE_PREFIX`
* @returns {Promise}
*    A promise that is resolved when the given message is emitted.
*/
function once(mm, message) {
  return new Promise(resolve => {
    on(mm, message, function onMessage({ data }) {
      off(mm, message, onMessage);
      resolve(data);
    });
  });
}
exports.once = once;

/**
* Asynchronously emit a `message` to the listeners of the given message
* manager.
*
* @param {nsIMessageListenerManager} mm
*    The Message Manager
* @param {String} message
*    The message. It will be prefixed with the constant `MESSAGE_PREFIX`.
* @param {Object} data
*    A JSON object containing data to be delivered to the listeners.
*/
function emit(mm, message, data) {
  mm.sendAsyncMessage(MESSAGE_PREFIX + message, data);
}
exports.emit = emit;

/**
* Asynchronously send a "request" over the given message manager, and returns
* a promise that is resolved when the request is complete.
*
* @param {nsIMessageListenerManager} mm
*    The Message Manager
* @param {String} message
*    The message. It will be prefixed with the constant `MESSAGE_PREFIX`, and
*    also suffixed with `REQUEST_DONE_SUFFIX` for the reply.
* @param {Object} data
*    A JSON object containing data to be delivered to the listeners.
* @returns {Promise}
*    A promise that is resolved when the request is done.
*/
function request(mm, message, data) {
  const done = once(mm, message + REQUEST_DONE_SUFFIX);

  emit(mm, message, data);

  return done;
}
exports.request = request;

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