real-time

问题 I have been having some trouble updating my Friends list(mListView) view in real time in the application, it only seems to update when it is launched. I know its a matter of an update function but i do not know what to use. (I'm rather new to firebase and android, and i'm still learning about them.) Here is the code: private ListView mListView; private ArrayList<String> mFriends; private List<User> mUserList; private UserListAdapter mAdapter; @Nullable @Override public View onCreateView

问题 I intend to create a realtime counter. So one user can incremenet the counter value for specific key. Whilst another gets the updated count value via an ajax request (either in a loop, or using some long polling method). I will use a spring controller, which will inject the service class can I do something like below, or is there a better way : @Service public MyService{ //instance variable in spring injected service class, not sure if this correct static final Map<String, Integer> myMap;

问题 I am an iOS developer and I have written an app for a client, it is a fitness (Crossfit) timer app, it films you on your workout and adds real time overlays and rep counts to the finished video. It was a fairly challenging project to complete and I was just wondering if the same thing would be possible on Android? Essentially what I need to know is, is it possible to overlay text that changes (e.g a timer counting up in seconds) onto a recorded video? If anyone has written an app that does

问题 I am using PyQt5 and Qml to create a client application. This is a simplified sample of my Qml file: import QtQuick 2.11 import QtQuick.Window 2.2 import QtQuick.Controls 2.2 ApplicationWindow { visible: true width: Screen.width/2 height: Screen.height/2 Rectangle { id: rectangle x: 187 y: 92 width: 200 height: 200 color: "blue" } } The client app must receive the properties of the above rectangle from the server. In order to do that, I implemented a socket connection in the ".py" file. the

问题 Is it possible in a Compact Framework application to prevent the garbage collector from unconditionally stopping at least one of the threads, or to block GC collects at least in some portions of the code? I think it has to deal with setting real time priorities, but I found a lot of advice against doing it. 回答1: The GC needs to freeze all threads in order to inspect all objects. How could it do its job, if some thread is running and is modifying/creating an object? Better don't do it. What

问题 I am trying to deploy several Storm topologies in production. I checked the documentation but couldn't find any references on whether it is possible for the topologies to communicate via native methods. Does anyone have any suggestions on how this could be implemented? In short, I am interested to see if the it's possible for tuples to be sent across topologies. Thanks for your help! 回答1: Theoretically, you could probably make it happen. Practically, no. If you want to communicate via tuples,

问题 When using nohup the output of a script is buffered and only gets dumped to the log file (nohup.out) after the script has finished executing. It would be really useful to see the script output in something close to real-time, to know how it is progressing. Is there a way to make nohup write the output whenever it is produced by the script? Or, since such frequent file access operations are slow, to dump the output periodically during execution? 回答1: There's a special program for this:

问题 I am trying to understand what would be the difference between calling FileChannel.write in short successions with a 16k buffer AND mapping multiple ByteBuffers with an append size of 16k as described here: https://stackoverflow.com/a/7367952/962872 I would think that the mapped bytebuffer approach produces a lot of garbage as you discard the MappedByteBuffers after each append. And I am not sure it is faster either. And you still have to do a bunch of mapping operations... (one per append).

问题 Im trying to think of the best way to handle real time search for a website. The only solution I can come up with is to keep checking the server every few seconds for something new in the database, but that does not seem very practical to me. 回答1: As of 5.0.2 MySQL supports triggers: http://dev.mysql.com/doc/refman/5.0/en/triggers.html But unfortunately I don't know MySQL well enough to know whether you could do anything "useful" in them to notify the app (in Oracle I'd be thinking xp_'s). At

问题 I have a process that feeds a piece of hardware (data transmission device) with a specific buffer size. What can I reasonable expect from the windows scheduler windows to ensure I do not get a buffer underflow? My buffer is 32K in size and gets consumed at ~800k bytes per second. If I fill it in 16k byte batches that is one batch every 20ms. However, what is my lower limit for filling it. If say, I call sleep(0) in my filling loop what is my reasonable worst case scheduling interval? OS =