Hi, Channels on AppEngine are picky. There are multiple issues that I had to work around for an application that is currently in production: 1. Channels aren't working on backends 2. No API is available to mobile 3. The implementation is different from the test and production server 4. Connection/Disconnection handlers aren't reliably called
I could go more in details on each of those issues and explain how I worked around them, but if you are still evaluating possible solutions, I would say, avoid them at all cost. At the end, I had to implement a polling & memcache solution in order to *reliably* use channels. It did cost us a lot of time and I wouldn't repeat this error again. The fact is, it's the only solution that let you have a persistent connection on AppEngine. Sadly, with all the efforts I've put in there, I would like to re-use our current solution/model but it did prove itself to be very costly in terms of time and material, so it won't happen. Because of this, I'm no longer developing any application on GAE. That's my feedback but if you are looking for more tips & tricks about those, let me know. I'm always happy to help. On August 31, 2012 10:14:25 Miguel Alfonso Varela Fonseca wrote: > Hi All. > > I've recently faced the same problem. I've implemented some collaborative > work on my app. I've used the Channel API in dev mode and it works really > fine. After deploy, I've tried to do the same actions as in development, > but the "update" in the other client is never recieved. I've added some > logs to my code and I find the lines next lines are reached. > > final ChannelMessage channelMessage = new ChannelMessage(clientId, > myMessage); > ChannelServiceFactory.getChannelService().sendMessage(channelMessage); > > After this, on the client side nothing happens. > > In the App Engine console, I don't find none "warning", "error", or even, > "info" logs related to Channel API (Just logs from server I've added), So I > really don't know the cause of the failure. > > I've got Channel API working on a two weeks deploy, the actual version > works fine in dev mode, and the actual version has the same configuration > of the Channel API, so, I think, the issue is no related to my code (I > hope). > > I've read in some threads Channel API presented some production issues some > time ago. How can I know if there is a new issue on the whole service? > > Please, this release is really important to my clients, so I hope really > quick answares. > > Thank you so much. > > PD. in StackOverflow I've not found nothig related or usefull, even less in > the > https://groups.google.com/forum/?fromgroups#!topic/google-appengine/Z6XN_64cA7w > therad. > regardless of platform, the really important things are the answers. > > > > El miércoles, 14 de marzo de 2012 14:42:44 UTC-5, Ikai Lan (Google) > escribió: > > > > Praveen, > > > > Try asking this question on StackOverflow: > > > > > > https://groups.google.com/forum/?fromgroups#!topic/google-appengine/Z6XN_64cA7w > > > > Also, it would be helpful to provide more details when you do. "It sucks" > > is terrible information. That kind of feedback is not actionable. > > > > -- > > Ikai Lan > > Developer Programs Engineer, Google App Engine > > plus.ikailan.com > > > > > > > > On Mon, Mar 12, 2012 at 3:58 AM, praveen > > <praveensu...@gmail.com<javascript:> > > > wrote: > > > >> I have implement struts based chat application using channel API > >> trying to implement the chat application., The Sample struts chat > >> application works in local enviroinment .But in production > >> enviroinment totally it sucks.Please help > >> > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Google App Engine" group. > >> To post to this group, send email to > >> google-a...@googlegroups.com<javascript:> > >> . > >> To unsubscribe from this group, send email to > >> google-appengi...@googlegroups.com <javascript:>. > >> For more options, visit this group at > >> http://groups.google.com/group/google-appengine?hl=en. > >> > >> > > > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
