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Cleaned up how messages are passed and replies work.

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This commit is contained in:
Brendan Dahl 2011-12-08 14:51:26 -08:00
parent f7207a51f8
commit d1c823efce
2 changed files with 57 additions and 44 deletions
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84
src/worker.js
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@ -3,11 +3,35 @@
'use strict';
function Message(data) {
this.data = data;
this.allowsReply = false;
this.messager;
this.id;
}
Message.prototype = {
reply: function messageReply(data) {
if (!this.allowsReply)
error('This message does not accept replies.');
this.messager({
isReply: true,
callbackId: this.id,
data: data
});
},
setupReply: function setupReply(messager, id) {
this.allowsReply = true;
this.messager = messager;
this.id = id;
}
}
function MessageHandler(name, comObj) {
this.name = name;
this.comObj = comObj;
this.callbackIndex = 1;
this.callbacks = {};
var callbacks = this.callbacks = {};
var ah = this.actionHandler = {};
ah['console_log'] = [function ahConsoleLog(data) {
@ -16,38 +40,25 @@ function MessageHandler(name, comObj) {
ah['console_error'] = [function ahConsoleError(data) {
console.error.apply(console, data);
}];
ah['__resolve__'] = [ function(data) {
comObj.onmessage = function messageHandlerComObjOnMessage(event) {
var data = event.data;
if (data.isReply) {
var callbackId = data.callbackId;
if (data.callbackId in this.callbacks) {
var callback = this.callbacks[callbackId];
delete this.callbacks[callbackId];
if (data.callbackId in callbacks) {
var callback = callbacks[callbackId];
delete callbacks[callbackId];
callback(data.data);
} else {
throw 'Cannot resolve callback ' + callbackId;
}
}, this];
comObj.onmessage = function messageHandlerComObjOnMessage(event) {
var data = event.data;
if (data.action in ah) {
} else if (data.action in ah) {
var action = ah[data.action];
if (data.callbackId) {
action[0].call(action[1], {
data: data.data,
resolve: (function(callbackId) {
return function(resolvedData) {
comObj.postMessage({
action: '__resolve__',
data: {
data: resolvedData,
callbackId: data.callbackId
}
});
}})(data.callbackId)
});
} else {
action[0].call(action[1], data.data);
}
var message = new Message(data.data);
if (data.callbackId)
message.setupReply(this.postMessage, data.callbackId);
action[0].call(action[1], message);
} else {
throw 'Unkown action from worker: ' + data.action;
}
@ -81,7 +92,8 @@ var WorkerMessageHandler = {
setup: function wphSetup(handler) {
var pdfDoc = null;
handler.on('test', function wphSetupTest(data) {
handler.on('test', function wphSetupTest(message) {
var data = message.data;
handler.send('test', data instanceof Uint8Array);
});
@ -92,13 +104,15 @@ var WorkerMessageHandler = {
// undefined action `workerSrc`.
});
handler.on('doc', function wphSetupDoc(data) {
handler.on('doc', function wphSetupDoc(message) {
var data = message.data;
// Create only the model of the PDFDoc, which is enough for
// processing the content of the pdf.
pdfDoc = new PDFDocModel(new Stream(data));
});
handler.on('page_request', function wphSetupPageRequest(pageNum) {
handler.on('page_request', function wphSetupPageRequest(message) {
var pageNum = message.data;
pageNum = parseInt(pageNum);
@ -147,7 +161,8 @@ var WorkerMessageHandler = {
});
}, this);
handler.on('font', function wphSetupFont(data) {
handler.on('font', function wphSetupFont(message) {
var data = message.data;
var objId = data[0];
var name = data[1];
var file = data[2];
@ -195,13 +210,6 @@ var WorkerMessageHandler = {
handler.send('font_ready', [objId, obj]);
});
handler.on('jpeg_decoded', function jpegDecoded(data) {
var objId = data[0];
var imageData = data[1];
console.log('worker recieved decoded jpeg');
debugger;
}, this);
}
};