some work on the global worker queue and related API...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

ui/compatibility.js

@@ -357,18 +357,16 @@ if(window.CEF_dumpJSON != null){
 		}))
 	}
 
-	window._PREVIW_CREATE_QUEUE = null
-	
 	// Queued version of makeImagesPreviews(...)
 	window.makeImagesPreviewsQ = function(gids, sizes, mode){
 		gids = gids == null ? getClosestGIDs() : gids
 
 		// attach the the previous queue...
-		if(_PREVIW_CREATE_QUEUE == null){
+		if(WORKERS.preview_generator == null){
 			var queue = makeDeferredsQ()
-			_PREVIW_CREATE_QUEUE = queue.start()
+			WORKERS.preview_generator = queue.start()
 		} else {
-			var queue = _PREVIW_CREATE_QUEUE
+			var queue = WORKERS.preview_generator
 		}
 
 		// attach the workers to the queue...

ui/data.js

@@ -143,6 +143,9 @@ var UPDATE_SORT_ENABLED = false
 // XXX for some reason the sync version appears to work faster...
 var UPDATE_SYNC = false
 
+// object to register all the worker queues...
+var WORKERS = {}
+
 
 
 /**********************************************************************
@@ -1174,7 +1177,19 @@ function getPrevLocation(){
 * Actions...
 */
 
-/******************************************************** Extension **/
+/********************************************************* Workers ***/
+
+function killAllWorkers(){
+	for(var k in WORKERS){
+		console.log('Worker: Stopping:', k)
+		WORKERS[k].kill()
+	}
+	WORKERS = {}
+}
+
+
+
+/******************************************************* Extension ***/
 
 // Open image in an external editor/viewer
 //
@@ -1196,7 +1211,7 @@ function openImageWith(prog){
 
 
 
-/********************************************************** Sorting **/
+/********************************************************* Sorting ***/
 
 function reverseImageOrder(){
 	DATA.order.reverse()
@@ -1227,7 +1242,7 @@ function sortImagesByName(reverse){
 
 
 
-/*************************************************** Manual sorting **/
+/************************************************** Manual sorting ***/
 
 // Ordering images...
 // NOTE: this a bit more complicated than simply shifting an image 

ui/files.js

@@ -539,6 +539,11 @@ function loadDir(path, no_preview_processing, prefix){
 	prefix = prefix == null ? 'Data' : prefix
 	prefix = prefix === false ? null : prefix
 
+	// stop all workers running on current image set before we 
+	// move to the next...
+	// XXX is this the correct sopot for this???
+	killAllWorkers()
+
 	IMAGES_CREATED = false
 
 	path = normalizePath(path)
@@ -669,6 +674,10 @@ function updateImageOrientation(gid, no_update_loaded){
 	gid = gid == null ? getImageGID() : gid
 	var img = IMAGES[gid]
 
+	if(img == null){
+		return
+	}
+
 	return getImageOrientation(normalizePath(img.path))
 		.done(function(o){
 			var o_o = img.orientation
@@ -712,7 +721,15 @@ function updateImagesOrientation(gids, no_update_loaded){
 function updateImagesOrientationQ(gids, no_update_loaded){
 	gids = gids == null ? getClosestGIDs() : gids
 
-	var queue = makeDeferredsQ().start()
+	//var queue = makeDeferredsQ().start()
+	// attach the the previous queue...
+	if(WORKERS.image_orientation_reader == null){
+		var queue = makeDeferredsQ()
+		WORKERS.image_orientation_reader = queue.start()
+	} else {
+		var queue = WORKERS.image_orientation_reader
+	}
+
 	var last = null
 
 	// attach workers to queue...

ui/lib/jli.js

@@ -594,7 +594,7 @@ jQuery.fn.sortChildren = function(func){
 // 		.kill()
 // 			Stop the queue, preventing any new workers from starting.
 // 			NOTE: this will not kill the currently running worker.
-// 			NOTE: after killing a queue it can not be restarted.
+// 			NOTE: after a queue is killed it can not be restarted.
 //
 // 		.isWorking()
 // 			will return true if there is at least one worker still not
@@ -623,27 +623,41 @@ function makeDeferredsQ(first){
 	// NOTE: .enqueue(...) accepts a worker and any number of the arguments
 	// 		to be passed to the worker when it's its turn.
 	// NOTE: the worker must porduce a deffered/promice.
-	queue.enqueue = function(deffered){
+	queue.enqueue = function(worker){
 		var cur = $.Deferred()
 		var args = Array.apply(null, arguments).slice(1)
 
-		last.done(function(){
-
-			// see if we are killed...
-			if(queue.state() == 'resolved'){
-				// this will kill the queue as we continue only on success...
-				cur.reject() 
-				return
-			}
-
-			// do the work...
-			deffered.apply(null, args)
+		function run(){
+			return worker.apply(null, args)
 				.done(function(o){ 
 					cur.resolve(o) 
 				})
 				.fail(function(){ 
 					cur.resolve('fail') 
 				})
+		}
+
+		last.done(function(){
+
+			// XXX one way to stop and resume the queue execution is:
+			// 		1) add a "suspended" state
+			// 		2) in the "suspended" state bind the worker start to 
+			// 			.resume(...)
+			if(queue.state() == 'suspended'){
+				queue.resumed(function(){
+					run()
+				})
+
+			// if we are killed drop the work...
+			} else if(queue.state() == 'resolved'){
+				// this will kill the queue as we continue only on success...
+				cur.reject() 
+				return
+
+			// do the work now...
+			} else {
+				run()
+			}
 		})
 
 		last = cur
@@ -663,6 +677,24 @@ function makeDeferredsQ(first){
 		return this
 	}
 
+	/* XXX suspend interface...
+	// XXX change the state...
+	queue.suspend = function(){
+		// XXX 
+		return this
+	}
+	// XXX change the state...
+	queue.resume = function(){
+		// XXX 
+		return this
+	}
+	// XXX change the state...
+	queue.resumed = function(){
+		// XXX 
+		return this
+	}
+	*/
+
 	// Report work state...
 	// XXX make this a propper state, or integrate into the deferred in 
 	// 		a more natural way...