Hi, Forgot: you can use Thread.sleep() to wait (java.lang.Thread is also part of the JRE)
regards didier On Jan 29, 3:35 pm, Didier Durand <[email protected]> wrote: > 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.
