Init version of session disable to only have one active browser window with tasks.

app/assets/javascripts/app/controllers/_application_controller.js.coffee

@@ -391,7 +391,7 @@ class App.ControllerModal extends App.Controller
     # do not use @el, because it's inserted by js
     if options
       delete options.el
-      
+
       # callbacks
 #      @callback = {}
 #      if options.success
@@ -439,7 +439,8 @@ class App.ErrorModal extends App.ControllerModal
     @render()
 
   render: ->
-    @html App.view('error')(
+    @html App.view('modal')(
+      title:   'Error',
       message: @message
       detail:  @detail
       close:   @close
@@ -448,3 +449,40 @@ class App.ErrorModal extends App.ControllerModal
       backdrop: false,
       keyboard: false,
     )
+
+class App.SessionReloadModal extends App.ControllerModal
+  constructor: ->
+    super
+    @render()
+
+  render: ->
+    @html App.view('modal')(
+      title:   @title || '?'
+      message: @message || '?'
+      detail:  @detail
+      close:   @close
+      button:  @button
+    )
+    @modalShow(
+      backdrop: @backdrop,
+      keyboard: @keyboard,
+    )
+
+  modalHide: (e) ->
+    @reload(e)
+
+  submit: (e) ->
+    @reload(e)
+
+  reload: (e) ->
+    if e
+      e.preventDefault()
+    if window.location.reload
+      window.location.reload()
+      return true
+    if window.location.href
+      window.location.href = window.location.href
+      return true
+
+    throw "Cant reload page!"
+

app/assets/javascripts/app/controllers/task_widget.js.coffee

@@ -15,6 +15,34 @@ class App.TaskWidget extends App.Controller
       App.TaskManager.reset()
       @el.html('')
 
+    # only do take over check after spool messages are finised
+    App.Event.bind 'spool:sent', (data) =>
+      @spoolSent = true
+
+    # session take over message
+    App.Event.bind 'session:takeover', (data) =>
+
+      # only if spool messages are already sent
+      return if !@spoolSent
+
+      # check if error message is already shown
+      if !@error
+
+        # only if new client id isnt own client id
+        if data.client_id isnt App.TaskManager.clientId()
+          @error = new App.SessionReloadModal(
+            title:    'Session'
+            message:  'Session taken over... please reload page or work with other browser window.'
+            keyboard: false
+            backdrop: true
+            close:    true
+            button:   'Reload application'
+          )
+
+          # disable all delay's and interval's
+          App.Delay.reset()
+          App.Interval.reset()
+
   render: ->
 
     return if _.isEmpty( @Session.all() )

app/assets/javascripts/app/lib/app_post/delay.js.coffee

@@ -16,6 +16,11 @@ class App.Delay
       _instance ?= new _Singleton
     _instance.clearLevel( level )
 
+  @reset: ( level ) ->
+    if _instance == undefined
+      _instance ?= new _Singleton
+    _instance.reset( level )
+
   @_all: ->
     if _instance == undefined
       _instance ?= new _Singleton
@@ -78,6 +83,12 @@ class _Singleton extends Spine.Module
       @clear( key, level )
     @levelStack[level] = {}
 
+  reset: ->
+    for level, items of @levelStack
+      for key, data of items
+        @clear( key, level )
+      @levelStack[level] = {}
+
   _all: ->
     return @levelStack
 

app/assets/javascripts/app/lib/app_post/interval.js.coffee

@@ -16,6 +16,11 @@ class App.Interval
       _instance ?= new _Singleton
     _instance.clearLevel( level )
 
+  @reset: ( level ) ->
+    if _instance == undefined
+      _instance ?= new _Singleton
+    _instance.reset( level )
+
   @_all: ->
     if _instance == undefined
       _instance ?= new _Singleton
@@ -76,5 +81,11 @@ class _Singleton extends Spine.Module
       @clear( key, level )
     @levelStack[level] = {}
 
+  reset: ->
+    for level, items of @levelStack
+      for key, data of items
+        @clear( key, level )
+      @levelStack[level] = {}
+
   _all: ->
     return @levelStack

app/assets/javascripts/app/lib/app_post/task_manager.js.coffee

@@ -54,6 +54,11 @@ class App.TaskManager
       _instance ?= new _Singleton
     _instance.workerAll()
 
+  @clientId: ->
+    if _instance == undefined
+      _instance ?= new _Singleton
+    _instance.clientId()
+
 class _Singleton extends App.Controller
   @include App.Log
 
@@ -230,18 +235,38 @@ class _Singleton extends App.Controller
       if !task
         throw "No such task with '#{key}' of order"
       prio++
-      task.prio = prio
-      task.save()
+      if task.prio isnt prio
+        task.prio = prio
+        task.save()
 
   reset: =>
     App.Taskbar.deleteAll()
     App.Event.trigger 'ui:rerender'
 
+  clientId: =>
+    if !@clientIdInt
+       @clientIdInt = Math.floor( Math.random() * 99999999 )
+    @clientIdInt
+
   tasksInitial: =>
     # reopen tasks
 #    App.Taskbar.fetch()
     tasks = @all()
     return if !tasks
+
+    # check if we have different
+
+    # broadcast to other browser instance
+    App.WebSocket.send(
+      action: 'broadcast'
+      event:  'session:takeover'
+      spool:  true
+      data:
+        recipient:
+          user_id: [ App.Session.get( 'id' ) ]
+        client_id: @clientId()
+    )
+
     task_count = 0
     for task in tasks
       task_count += 1

app/assets/javascripts/app/views/modal.jst.eco

@@ -2,7 +2,7 @@
 <% if @close: %>
   <a href="#" class="close">&times;</a>
 <% end %>
-  <h2><%- @T( 'Error' ) %></h2>
+  <h2><%- @T( @title ) %></h2>
 </div>
 <div class="modal-body">
   <form class="form-horizontal">
@@ -13,8 +13,10 @@
   </form>
 </div>
 <div class="modal-footer">
-<!--
-  <button class="btn btn-primary submit"><%- @T( 'Submit' ) %></button>
+<% if @button: %>
+  <button class="btn btn-primary submit"><%- @T( @button ) %></button>
+<% end %>
+<% if @cancel: %>
   <button class="btn cancel"><%- @T( 'Cancel' ) %></button>
--->
+<% end %>
 </div>

script/websocket-server.rb

@@ -172,6 +172,9 @@ EventMachine.run {
 
           end
         }
+
+        # send spool:sent event to client
+        @clients[client_id][:websocket].send( '[{"event":"spool:sent"}]' )
       end
 
       # get session