Hi, LinkedBlokingQueue is part of JRE WhiteList: http://code.google.com/appengine/docs/java/jrewhitelist.html. So, you can use it.
But, I dont see the need. Why don't you just from on the datastore on 1 side and read from it on the other. It would be very simple and rely on the most basic (i.e solid) mechanism of gae. (I would recommend Objectify for ds read/ write) As you have network round-trips, the read / write time will be negligible even it can seem high compared to an in-memory mechanism like a Queue. regards didier On Jan 29, 1:51 pm, arturad <[email protected]> wrote: > In my application an embedded device (no public IP) should connect to > the GAE in order to obtain some data from it. The data are provided by > the web browser. > > The whole data-passing process looks like: > > web browser -> GAE -> > embedded standalone device > > I developed a servlet the device connects to. It issues the HTTP GET. > On the other side the web browser sends data using standard GWT > RemoteServiceServlet. > > In case there is no data for the device the doGet method in the > servlet should stop for some seconds until user enters data or time > out expires. > > I'm trying to use LinkedBlockingQueue to pass data between two > servlets. It does not work unfortunately. Seems like the GAE launches > new JVM for concurrent requests... I pushed the LinkedBlockingQueue > into memcache and get it by name from concurrent requests. Still does > not work. Memcache returns NOTnull. But there are no data in the > queue. > > In order to investigate my issue I've made some tests with the > semaphore. Pushed the semaphore to the memcache and made some > concurrent operations ... -> does not work -> one process does not > release the other... > > The problem occurs on GAE only. The whole mechanism works on the > development server. > > Is there any way to stop/freeze one process (in the doGet method in > servlet) and unblock it by another one ? > > Or... Is there any other way to solve my problem ? > Thank you for any suggestions. > Artur -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
