Examples of java.nio.file.WatchKey.pollEvents()

java.nio.file.WatchKey.pollEvents()
Retrieves and removes all pending events for this watch key, returning a {@code List} of the events that were retrieved.
Note that this method does not wait if there are no events pending. @return the list of the events retrieved; may be empty

  @Override
  protected boolean pollEvents() throws Exception {
    // Take events, but don't care what they are!
    WatchKey watchKey = watchService.take();
    
    watchKey.pollEvents(); 
    watchKey.reset();
    
    // Events are always relevant; ignored paths are not monitored
    return true; 
  }

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            } catch (InterruptedException e) {
                throw new StLightException(e);
            }


            // Go through all the events
            for (WatchEvent<?> event : key.pollEvents()) {
                WatchEvent<Path> pathEvent = (WatchEvent<Path>) event;


                // Check the path
                Path completePath = pathByKey.get(key).resolve(pathEvent.context());
                File completeFile = completePath.toFile();

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            key = watchService.take();
          } catch (InterruptedException e) {
            return;
          }


          for (WatchEvent<?> event : key.pollEvents()) {
            WatchEvent.Kind<?> kind = event.kind();


            if (kind == OVERFLOW) {
              continue;
            }

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            while (true) {
                final WatchKey key = watchService.take();
                if(key == null){
                    continue;
                }
                for (WatchEvent<?> watchEvent : key.pollEvents()) {
                    final WatchEvent.Kind<?> kind = watchEvent.kind();
                    //忽略无效事件
                    if (kind == StandardWatchEventKinds.OVERFLOW) {
                        continue;
                    }

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