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index.js
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index.js
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module.exports = function duetChannel(namespace, callback) {
var _postMessageToMain = null;
var _postMessageToWorker = null;
var mainQueue = [];
var workerQueue = [];
var messageHandlers = {};
function connectMain(postMessage) {
_postMessageToWorker = postMessage;
if (typeof callback === 'function') {
callback('main');
}
while (workerQueue.length) {
_postMessageToWorker(workerQueue.shift());
}
workerQueue = null;
}
function connectWorker(postMessage) {
_postMessageToMain = postMessage;
if (typeof callback === 'function') {
callback('worker');
}
while (mainQueue.length) {
_postMessageToMain(mainQueue.shift());
}
mainQueue = null;
}
function postMessageToMain(message) {
if (typeof _postMessageToMain === 'function') {
return _postMessageToMain(message);
}
mainQueue.push(message);
}
function postMessageToWorker(message) {
if (typeof _postMessageToWorker === 'function') {
return _postMessageToWorker(message);
}
workerQueue.push(message);
}
function handleMessage(type, data) {
var messageHandler = messageHandlers[type];
if (messageHandler != null) {
messageHandler(data);
}
}
function on(type, messageHandler) {
messageHandlers[type] = messageHandler;
}
return {
// Used by duet
namespace: namespace,
connectMain: connectMain,
connectWorker: connectWorker,
handleMessage: handleMessage,
// Used by plugin
postMessageToMain: postMessageToMain,
postMessageToWorker: postMessageToWorker,
on: on
};
};