polling

问题 Scan a set of directories continuously for a set of file name filters. For each file name filter arrived, process the file and repeat the steps for all What can be the recommended design for this in jdk 1.5 , possibly using java.concurrent.Executor and Future 回答1: I have done a similar task with the web crawler.Just a few changes had to be made... It is a concurrent implementation with newly found directories getting scanned by the thread pool in the Executor Framework.It uses concurrent

问题 I'm trying for the life of me to get this plugin to work but I'm not understanding the status function so retry is not firing. $.poll(10000, function(retry){ $.get('willfail', function(response, status){ if (status == 'success') { // Do something alert("YES"); } else { alert("NO"); //retry(); } }) }) If I set the get request to '/' it will give me the alert YES message, but as it is, the alert No message never gets fired despite the ELSE. I'm using a jquery polling plugin: https://github.com

问题 I'm attempting to improve performance on a suite that tests against ElasticSearch. The tests take a long time because Elasticsearch does not update it's indexes immediately after updating. For instance, the following code runs without raising an assertion error. from elasticsearch import Elasticsearch elasticsearch = Elasticsearch('es.test') # Asumming that this is a clean and empty elasticsearch instance elasticsearch.update( index='blog', doc_type=,'blog' id=1, body={ .... } ) results =

问题 I just inherited an Android app project as a (technical) product manager that uses a 5 second timer to poll a remote URL to see if some work initiated by the app has finished. My initial reaction of course was to suggest to replace this with a push/notifications mechanism , preferably Android's built in GCM, so the work is removed from the app on the phone and put on the server side. Surprisingly I met resistance from the development team. A former product manager (my predecessor) seems to

问题 I wrote a small TCP servers with socket() + POLLIN poll() + recv() + send() , but I don't know when to use POLLOUT poll or select writefds to poll on writable event. Can anyone give me an example of the real usage of POLLOUT ? 回答1: The usual pattern is to use non-blocking file descriptors with poll() like this: When getting ready to poll() , Always set POLLIN because you are always interested in reading what the other end of the socket has send you. Except if you have a large backlog of

问题 I am learning Unity with C# and studying the GUI Button. I found the following statement in Unity documentation: "This means that your OnGUI implementation might be called several times per frame (one call per event). " using UnityEngine; using System.Collections; public class ExampleClass : MonoBehaviour { void OnGUI() { if (GUI.Button(new Rect(10, 10, 150, 100), "I am a button")) print("You clicked the button!"); } } My questions are: 1) The above "if" statement will keep detecting the

问题 I am learning Unity with C# and studying the GUI Button. I found the following statement in Unity documentation: "This means that your OnGUI implementation might be called several times per frame (one call per event). " using UnityEngine; using System.Collections; public class ExampleClass : MonoBehaviour { void OnGUI() { if (GUI.Button(new Rect(10, 10, 150, 100), "I am a button")) print("You clicked the button!"); } } My questions are: 1) The above "if" statement will keep detecting the

问题 Requirement: User scans multiple job numbers, for each job number , I need to call one API and get the total job details and show it in a table below the scanned text box. User don't want to wait until API call finishes. He will scan continuously irrespective of details came or not. What I have done: I have taken one variable jobNumberList which stores all the job numbers the user scanned I am continuously calling the API, with those job numbers. When API, gives response , then I am adding to

问题 I am buidling some webapp and have implemented long-polling (and a command queue in my db) so my server can send commands to my cleint asynchronously, etc. The commands are encoded into json and sent over ajax calls for the client to server, and via long-polling for the server to client way. Everything was working just fine, until I included my "Authentication module" in the ajax.php file. This module wraps the session stuff and calls session_start(). The problem is that, my long polling

问题 I have seen a question on why "polling is bad". In terms of minimizing the amount of processor time used by one thread, would it be better to do a spin wait (i.e. poll for a required change in a while loop) or wait on a kernel object (e.g. a kernel event object in windows)? For context, assume that the code would be required to run on any type of processor, single core, hyperthreaded, multicore, etc. Also assume that a thread that would poll or wait can't continue until the polling result is