lib/Joose/Gears.js

/**
 * Joose.Gears is a meta class for classes that want to delegate work to gears workers
 * @name Joose.Gears
 * @extends Joose.Class
 * @constructor
 */
Class("Joose.Gears", {
    isa: Joose.Class,
    has: {
        wp: {  },
        calls: { init: {} },
        callIndex: { init: 0 }
    },
    
    methods: {
        initialize: function () {
            JooseGearsInitializeGears() 
            if(this.canGears()) {
                this.wp = google.gears.factory.create('beta.workerpool');
                var me = this;
                this.wp.onmessage = function (a,b,message) {
                    me.handleGearsMessage(message)
                }
            }
        },
        handleGearsMessage: function (message) {
            var paras  = JSON.parse(message.text);
            var cbName = paras.to;
            var ret    = paras.ret;
            var object = this.calls[paras.index];
            object[cbName].call(object, ret)
            delete this.calls[paras.index]
        },
        
        canGears: function () {
            return window.google && window.google.gears && window.google.gears.factory
        },
        
        /**
         * Adds a worker to the class
         * @function
         * @name addWorker
         * @param {string} Name of the worker
         * @param {function} Function body of the worker
         * @param {props} Optional properties for the created method (ignored)
         * @memberof Joose.Gears
         */    
        addWorker:         function (name, func, props) {
            
            var cbName  = "on"+Joose.S.uppercaseFirst(name)
            
            // No gears, then work inline
            if(!this.canGears()) {
                var wrapped = function () {
                    var ret = func.apply(this, arguments);
                    this[cbName].call(this, ret)
                }
                this.addMethod(name, wrapped, props)
                return
            }
            
            // OK, we have gears support
            
            var json = new Joose.SimpleRequest().getText("json2.js")
                
            var source = "function aClass () {}; aClass.prototype."+name+" = "+func.toString()+"\n\n"+
              "var wp = google.gears.workerPool\n" +
              "wp.onmessage = function (a,b,message) {\n"+
              "var paras = JSON.parse(message.text)\n"+
              "var o = new aClass(); var ret = o."+name+".apply(o, paras.args); wp.sendMessage(JSON.stringify({ ret: ret, to: paras.cbName, index: paras.index }), message.sender)"+
              "\n}\n\n";
        
            
            source += json
            
            var wp      = this.wp;
            
            var childId = wp.createWorker(source)
            
            var me      = this
                
            var wrapped = function () {
                var message = JSON.stringify({ args: arguments, cbName: cbName, index: me.callIndex })
                wp.sendMessage(message, childId);
                me.calls[me.callIndex] = this
                me.callIndex++
                
            }
            this.addMethod(name, wrapped, props)

        }
    }
})

// Copyright 2007, Google Inc.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//  2. Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//  3. Neither the name of Google Inc. nor the names of its contributors may be
//     used to endorse or promote products derived from this software without
//     specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Sets up google.gears.*, which is *the only* supported way to access Gears.
//
// Circumvent this file at your own risk!
//
// In the future, Gears may automatically define google.gears.* without this
// file. Gears may use these objects to transparently fix bugs and compatibility
// issues. Applications that use the code below will continue to work seamlessly
// when that happens.

// Sorry Google for modifying this :) 
function JooseGearsInitializeGears() {
  // We are already defined. Hooray!
  if (window.google && google.gears) {
    return;
  }

  var factory = null;

  // Firefox
  if (typeof GearsFactory != 'undefined') {
    factory = new GearsFactory();
  } else {
    // IE
    try {
      factory = new ActiveXObject('Gears.Factory');
      // privateSetGlobalObject is only required and supported on WinCE.
      if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
        factory.privateSetGlobalObject(this);
      }
    } catch (e) {
      // Safari
      if (navigator.mimeTypes["application/x-googlegears"]) {
        factory = document.createElement("object");
        factory.style.display = "none";
        factory.width = 0;
        factory.height = 0;
        factory.type = "application/x-googlegears";
        document.documentElement.appendChild(factory);
      }
    }
  }

  // *Do not* define any objects if Gears is not installed. This mimics the
  // behavior of Gears defining the objects in the future.
  if (!factory) {
    return;
  }

  // Now set up the objects, being careful not to overwrite anything.
  //
  // Note: In Internet Explorer for Windows Mobile, you can't add properties to
  // the window object. However, global objects are automatically added as
  // properties of the window object in all browsers.
  if (!window.google) {
    google = {};
  }

  if (!google.gears) {
    google.gears = {factory: factory};
  }
}


1	/**
2	* Joose.Gears is a meta class for classes that want to delegate work to gears workers
3	* @name Joose.Gears
4	* @extends Joose.Class
5	* @constructor
6	*/
7	Class("Joose.Gears", {
8	isa: Joose.Class,
9	has: {
10	wp: { },
11	calls: { init: {} },
12	callIndex: { init: 0 }
13	},
14
15	methods: {
16	initialize: function () {
17	JooseGearsInitializeGears()
18	if(this.canGears()) {
19	this.wp = google.gears.factory.create('beta.workerpool');
20	var me = this;
21	this.wp.onmessage = function (a,b,message) {
22	me.handleGearsMessage(message)
23	}
24	}
25	},
26	handleGearsMessage: function (message) {
27	var paras = JSON.parse(message.text);
28	var cbName = paras.to;
29	var ret = paras.ret;
30	var object = this.calls[paras.index];
31	object[cbName].call(object, ret)
32	delete this.calls[paras.index]
33	},
34
35	canGears: function () {
36	return window.google && window.google.gears && window.google.gears.factory
37	},
38
39	/**
40	* Adds a worker to the class
41	* @function
42	* @name addWorker
43	* @param {string} Name of the worker
44	* @param {function} Function body of the worker
45	* @param {props} Optional properties for the created method (ignored)
46	* @memberof Joose.Gears
47	*/
48	addWorker: function (name, func, props) {
49
50	var cbName = "on"+Joose.S.uppercaseFirst(name)
51
52	// No gears, then work inline
53	if(!this.canGears()) {
54	var wrapped = function () {
55	var ret = func.apply(this, arguments);
56	this[cbName].call(this, ret)
57	}
58	this.addMethod(name, wrapped, props)
59	return
60	}
61
62	// OK, we have gears support
63
64	var json = new Joose.SimpleRequest().getText("json2.js")
65
66	var source = "function aClass () {}; aClass.prototype."+name+" = "+func.toString()+"\n\n"+
67	"var wp = google.gears.workerPool\n" +
68	"wp.onmessage = function (a,b,message) {\n"+
69	"var paras = JSON.parse(message.text)\n"+
70	"var o = new aClass(); var ret = o."+name+".apply(o, paras.args); wp.sendMessage(JSON.stringify({ ret: ret, to: paras.cbName, index: paras.index }), message.sender)"+
71	"\n}\n\n";
72
73
74	source += json
75
76	var wp = this.wp;
77
78	var childId = wp.createWorker(source)
79
80	var me = this
81
82	var wrapped = function () {
83	var message = JSON.stringify({ args: arguments, cbName: cbName, index: me.callIndex })
84	wp.sendMessage(message, childId);
85	me.calls[me.callIndex] = this
86	me.callIndex++
87
88	}
89	this.addMethod(name, wrapped, props)
90
91	}
92	}
93	})
94
95	// Copyright 2007, Google Inc.
96	//
97	// Redistribution and use in source and binary forms, with or without
98	// modification, are permitted provided that the following conditions are met:
99	//
100	// 1. Redistributions of source code must retain the above copyright notice,
101	// this list of conditions and the following disclaimer.
102	// 2. Redistributions in binary form must reproduce the above copyright notice,
103	// this list of conditions and the following disclaimer in the documentation
104	// and/or other materials provided with the distribution.
105	// 3. Neither the name of Google Inc. nor the names of its contributors may be
106	// used to endorse or promote products derived from this software without
107	// specific prior written permission.
108	//
109	// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
110	// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
111	// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
112	// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
113	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
114	// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
115	// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
116	// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
117	// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
118	// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
119	//
120	// Sets up google.gears., which is the only* supported way to access Gears.
121	//
122	// Circumvent this file at your own risk!
123	//
124	// In the future, Gears may automatically define google.gears.* without this
125	// file. Gears may use these objects to transparently fix bugs and compatibility
126	// issues. Applications that use the code below will continue to work seamlessly
127	// when that happens.
128
129	// Sorry Google for modifying this :)
130	function JooseGearsInitializeGears() {
131	// We are already defined. Hooray!
132	if (window.google && google.gears) {
133	return;
134	}
135
136	var factory = null;
137
138	// Firefox
139	if (typeof GearsFactory != 'undefined') {
140	factory = new GearsFactory();
141	} else {
142	// IE
143	try {
144	factory = new ActiveXObject('Gears.Factory');
145	// privateSetGlobalObject is only required and supported on WinCE.
146	if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
147	factory.privateSetGlobalObject(this);
148	}
149	} catch (e) {
150	// Safari
151	if (navigator.mimeTypes["application/x-googlegears"]) {
152	factory = document.createElement("object");
153	factory.style.display = "none";
154	factory.width = 0;
155	factory.height = 0;
156	factory.type = "application/x-googlegears";
157	document.documentElement.appendChild(factory);
158	}
159	}
160	}
161
162	// Do not define any objects if Gears is not installed. This mimics the
163	// behavior of Gears defining the objects in the future.
164	if (!factory) {
165	return;
166	}
167
168	// Now set up the objects, being careful not to overwrite anything.
169	//
170	// Note: In Internet Explorer for Windows Mobile, you can't add properties to
171	// the window object. However, global objects are automatically added as
172	// properties of the window object in all browsers.
173	if (!window.google) {
174	google = {};
175	}
176
177	if (!google.gears) {
178	google.gears = {factory: factory};
179	}
180	}
181
182