java - WatchService: missed and unhandled events -

-

i'm having issue watchservice. here snippet of code:

public void watch(){   //define folder root   path mydir = paths.get(rootdir+"inputfiles/"+dirname+"/request");          try {     watchservice watcher = mydir.getfilesystem().newwatchservice();     mydir.register(watcher, standardwatcheventkinds.entry_create);       watchkey watckkey = watcher.take();      list<watchevent<?>> events = watckkey.pollevents();     (watchevent event : events) {       //stuff     }   }catch(exception e){}    watckkey.reset();  }

*first of all, know watch() called inside infinite loop.

the problem when creating multiple files @ time, events missing. example, if copy-paste 3 files ".../request" folder, 1 gets caught, others remain if nothing happened, neither overflow event triggered. in different computer , os, reaches 2 files, if 1 tries 3 or more, rest still untouched.

i found workaround though, don't think it's best practice. flow:

the process starts , stops @ 

watchkey watckkey = watcher.take();

as expected, (as per processing events). then, drop 3 files in "request" folder, thus, process resumes at

list<watchevent<?>> events = watckkey.pollevents();

the issue here. seems thread goes fast through line 2 created events stay behind , lost, 1 taken. workaround add line right above one, this:

thread.sleep(1000); list<watchevent<?>> events = watckkey.pollevents();

this seems solution, @ least 3 , several more simultaneous files, it's not scalable @ all. in conclusion, know if there better solution issue. fyi, i'm running win 7 64

thanks lot in advance!


Comments

Post a Comment

Popular posts from this blog

java - Custom OutputStreamAppender not run: LOGBACK: No context given for <MYAPPENDER> -

-
i wish write custom appender on basis of outputstreamappender . wrote following class package tests; import java.io.ioexception; import java.io.outputstream; import ch.qos.logback.core.outputstreamappender; public class myappender<e> extends outputstreamappender<e> { public myappender() { system.out.println("myappender created"); setoutputstream(new outputstream() { @override public void write(int b) throws ioexception { throw new unsupportedoperationexception(); } }); } } then wrote following runner: package tests; import org.slf4j.loggerfactory; import ch.qos.logback.classic.logger; public class runner { private static final logger log = (logger) loggerfactory.getlogger(runner.class); public static void main(string[] args) { //log.addappender(new myappender<iloggingevent>()); log.info("hello world"); } } finall...
Read more

java - UML - How would you draw a try catch in a sequence diagram? -

-
Image
is there standard way of drawing try catch sequence diagrams? i've made attempt based on this feel end result doesn't feel right. code diagram based around: public static void save () { try { filehandle filehandle = gdx.files.external(file); filehandle.writestring(boolean.tostring(constantshandler.soundenabled)+"\n", false); (int = 0; < 5; i++) { filehandle.writestring(integer.tostring(constantshandler.highscores[i])+"\n", true); } } catch (throwable e) { } } my attempt note: know still need add loop. that's ok. fragments meant show conditional control flow in sequence diagram. superstructures puts limitations on use of fragments (see pp. 467 of ss2.1.1). should use critical region try part above. , option catch . however, keep telling can take quite freedom in using uml. it's language , such changes in life time. long reader ge...
Read more

c++ - No viable overloaded operator for references a map -

-
i trying use map can make tag names reference number. when try , use it, in code error (6 in total every time reference map): src/main.cpp:25:45: error: no viable overloaded operator[] type 'std::map<std::string, std::string>' const char* idcs = node.child_value(tagmap[3]); this code: #include "pugi/pugixml.hpp" #include <iostream> #include <string> #include <map> int main() { pugi::xml_document doca, docb; std::map<std::string, pugi::xml_node> mapa, mapb; std::map<std::string, std::string> tagmap {{"1", "data"}, {"2", "entry"}, {"3", "id"}, {"4", "content"}}; if (!doca.load_file("a.xml") || !docb.load_file("b.xml")) { std::cout << "can't find input files"; return 1; } (auto& node: doca.child(tagmap[1]).children(tagmap[2])) { co...
Read more