removed Job abstraction since it's constructor was only called in one place internally and the resulting object was private. removed file and reference in build.

build.xml

@@ -28,7 +28,6 @@
             <file name="src/strings.js" />
             <file name="src/point.js" />
             <file name="src/profiler.js" />
-            <file name="src/job.js" />
             <file name="src/imageloader.js" />
             <file name="src/tilesource.js" />
             <file name="src/dzitilesource.js" />

openseadragon.js

@@ -1337,7 +1337,7 @@ $.Viewer = function( options ) {
             maxZoomPixelRatio:  2,
             visibilityRatio:    0.5,
             springStiffness:    5.0,
-            imageLoaderLimit:   2,
+            imageLoaderLimit:   0,
             clickTimeThreshold: 200,
             clickDistThreshold: 5,
             zoomPerClick:       2.0,
@@ -2390,54 +2390,9 @@ $.Profiler.prototype = {
 }( OpenSeadragon ));
 
 (function( $ ){
-    
+
-$.Job = function( src, callback ) {
-    this.image = null;
-    this.timeout = null;
-    this.src = src;
-    this.callback = callback;
     //TODO: make TIMEOUT configurable
-    this.TIMEOUT = 5000;
+    var TIMEOUT = 5000;
-};
-
-$.Job.prototype = {
-    start: function() {
-        var _this = this;
-        this.image = new Image();
-        this.image.onload = function(){
-            finish( _this, true );
-        };
-        this.image.onabort = this.image.onerror = function(){
-            finish( _this, false );
-        };
-        this.timeout = window.setTimeout( function(){
-            onerror( _this );
-        }, this.TIMEOUT );
-
-        this.image.src = this.src;
-    }
-};
-
-function finish( job, success ){
-    var image    = job.image,
-        callback = job.callback;
-
-    image.onload = null;
-    image.onabort = null;
-    image.onerror = null;
-
-    if ( job.timeout ) {
-        window.clearTimeout( job.timeout );
-    }
-    window.setTimeout( function() {
-        callback(job.src, success ? image : null);
-    }, 1 );
-
-};
-
-}( OpenSeadragon ));
-
-(function( $ ){
     
 $.ImageLoader = function( imageLoaderLimit ) {
     this.downloading = 0;
@@ -2446,31 +2401,67 @@ $.ImageLoader = function( imageLoaderLimit ) {
 
 $.ImageLoader.prototype = {
     loadImage: function(src, callback) {
-        var _this = this;
+        var _this = this,
-        if (this.downloading >= this.imageLoaderLimit) {
+            loading = false,
-            return false;
+            image,
+            jobid,
+            complete;
+
+        if ( !this.imageLoaderLimit || this.downloading < this.imageLoaderLimit ) {
+            
+            this.downloading++;
+
+            image = new Image();
+
+            complete = function( imagesrc ){
+                _this.downloading--;
+                if (typeof ( callback ) == "function") {
+                    try {
+                        callback( image );
+                    } catch ( e ) {
+                        $.Debug.error(
+                            e.name + " while executing " + src +" callback: " + e.message, 
+                            e
+                        );
+                    }
+                }
+            };
+
+            image.onload = function(){
+                finish( image, complete, true );
+            };
+
+            image.onabort = image.onerror = function(){
+                finish( image, complete, false );
+            };
+
+            jobid = window.setTimeout( function(){
+                finish( image, complete, false, jobid );
+            }, TIMEOUT );
+
+            loading   = true;
+            image.src = src;
         }
 
-        var job = new $.Job(src, function(src, image){
+        return loading;
-            
-            _this.downloading--;
-            if (typeof (callback) == "function") {
-                try {
-                    callback(image);
-                } catch (e) {
-                    $.Debug.error(e.name + " while executing " + src +
-                                " callback: " + e.message, e);
-                }
-            }
-        });
-
-        this.downloading++;
-        job.start();
-
-        return true;
     }
 };
 
+function finish( image, callback, successful, jobid ){
+
+    image.onload = null;
+    image.onabort = null;
+    image.onerror = null;
+
+    if ( jobid ) {
+        window.clearTimeout( jobid );
+    }
+    window.setTimeout( function() {
+        callback( image.src, successful ? image : null);
+    }, 1 );
+
+};
+
 }( OpenSeadragon ));
 
 (function( $ ){

src/imageloader.js

@@ -1,5 +1,8 @@
 
 (function( $ ){
+
+    //TODO: make TIMEOUT configurable
+    var TIMEOUT = 5000;
     
 $.ImageLoader = function( imageLoaderLimit ) {
     this.downloading = 0;
@@ -8,29 +11,65 @@ $.ImageLoader = function( imageLoaderLimit ) {
 
 $.ImageLoader.prototype = {
     loadImage: function(src, callback) {
-        var _this = this;
+        var _this = this,
-        if (this.downloading >= this.imageLoaderLimit) {
+            loading = false,
-            return false;
+            image,
+            jobid,
+            complete;
+
+        if ( !this.imageLoaderLimit || this.downloading < this.imageLoaderLimit ) {
+            
+            this.downloading++;
+
+            image = new Image();
+
+            complete = function( imagesrc ){
+                _this.downloading--;
+                if (typeof ( callback ) == "function") {
+                    try {
+                        callback( image );
+                    } catch ( e ) {
+                        $.Debug.error(
+                            e.name + " while executing " + src +" callback: " + e.message, 
+                            e
+                        );
+                    }
+                }
+            };
+
+            image.onload = function(){
+                finish( image, complete, true );
+            };
+
+            image.onabort = image.onerror = function(){
+                finish( image, complete, false );
+            };
+
+            jobid = window.setTimeout( function(){
+                finish( image, complete, false, jobid );
+            }, TIMEOUT );
+
+            loading   = true;
+            image.src = src;
         }
 
-        var job = new $.Job(src, function(src, image){
+        return loading;
-            
-            _this.downloading--;
-            if (typeof (callback) == "function") {
-                try {
-                    callback(image);
-                } catch (e) {
-                    $.Debug.error(e.name + " while executing " + src +
-                                " callback: " + e.message, e);
-                }
-            }
-        });
-
-        this.downloading++;
-        job.start();
-
-        return true;
     }
 };
 
+function finish( image, callback, successful, jobid ){
+
+    image.onload = null;
+    image.onabort = null;
+    image.onerror = null;
+
+    if ( jobid ) {
+        window.clearTimeout( jobid );
+    }
+    window.setTimeout( function() {
+        callback( image.src, successful ? image : null);
+    }, 1 );
+
+};
+
 }( OpenSeadragon ));

src/job.js

@@ -1,48 +0,0 @@
-
-(function( $ ){
-    
-$.Job = function( src, callback ) {
-    this.image = null;
-    this.timeout = null;
-    this.src = src;
-    this.callback = callback;
-    //TODO: make TIMEOUT configurable
-    this.TIMEOUT = 5000;
-};
-
-$.Job.prototype = {
-    start: function() {
-        var _this = this;
-        this.image = new Image();
-        this.image.onload = function(){
-            finish( _this, true );
-        };
-        this.image.onabort = this.image.onerror = function(){
-            finish( _this, false );
-        };
-        this.timeout = window.setTimeout( function(){
-            onerror( _this );
-        }, this.TIMEOUT );
-
-        this.image.src = this.src;
-    }
-};
-
-function finish( job, success ){
-    var image    = job.image,
-        callback = job.callback;
-
-    image.onload = null;
-    image.onabort = null;
-    image.onerror = null;
-
-    if ( job.timeout ) {
-        window.clearTimeout( job.timeout );
-    }
-    window.setTimeout( function() {
-        callback(job.src, success ? image : null);
-    }, 1 );
-
-};
-
-}( OpenSeadragon ));

src/viewer.js

@@ -63,7 +63,7 @@ $.Viewer = function( options ) {
             maxZoomPixelRatio:  2,
             visibilityRatio:    0.5,
             springStiffness:    5.0,
-            imageLoaderLimit:   2,
+            imageLoaderLimit:   0,
             clickTimeThreshold: 200,
             clickDistThreshold: 5,
             zoomPerClick:       2.0,