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	dpavlin	46	/**
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