Examples of java.nio.channels.Selector.selectNow()

java.nio.channels.Selector.selectNow()
Selects a set of keys whose corresponding channels are ready for I/O operations.
This method performs a non-blocking selection operation. If no channels have become selectable since the previous selection operation then this method immediately returns zero.
Invoking this method clears the effect of any previous invocations of the {@link #wakeup wakeup} method.
@return The number of keys, possibly zero, whose ready-operation setswere updated by the selection operation @throws IOException If an I/O error occurs @throws ClosedSelectorException If this selector is closed

            acceptAndAddAll(serverSelector, server, initCount);
        if (serverChannels1.size() != initCount) {
            throw new Exception("Accepted " + serverChannels1.size() +
                                " instead of " + initCount);
        }
        serverSelector.selectNow();


        // Set up mass set of client sockets.
        log("Requesting mass client connections");
        client.connectClients(massCount);
        Thread.sleep(500);  // Wait for client connections to arrive

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        closeAll(serverChannels1);


        // Now get the timing of select() call.
        log("Running the final select call");
        long startTime = System.nanoTime();
        serverSelector.selectNow();
        long duration = durationMillis(startTime);
        log("Init count = " + initCount +
            ", mass count = " + massCount +
            ", duration = " + duration + "ms");

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    final Selector selector = provider.openSelector();


    final long timeStart = System.currentTimeMillis();


    final int readyCount = selector.selectNow();


    final long timeFinish = System.currentTimeMillis();


    final long timeDiff = timeFinish - timeStart;

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            }
        } catch (ClosedSelectorException ignore){
            // Ignore
        }
        try {
            selector.selectNow();
        } catch (Throwable t){
            ExceptionUtils.handleThrowable(t);
            // Ignore everything else
        }
        selector.close();

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  }


  final void selectNow() throws IOException {
    final Selector selector = this.selector;
    if (selector != null) {
      selector.selectNow();
    }
  }
}

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        tmpKey.cancel();
        tmpKey = null;
      }
      if (writeSelector != null) {
        try {
          writeSelector.selectNow();
        } catch (IOException e) {
          log.error("Temp selector selectNow error", e);
        }
        // return selector
        SelectorFactory.returnSelector(writeSelector);

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        tmpKey.cancel();
        tmpKey = null;
      }
      if (writeSelector != null) {
        // Cancel the key.
        writeSelector.selectNow();
        SelectorFactory.returnSelector(writeSelector);
      }
    }
    scheduleWritenBytes.addAndGet(0 - bytesProduced);
    return message.getMessage();

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        tmpKey.cancel();
        tmpKey = null;
      }
      if (readSelector != null) {
        // Cancel the key.
        readSelector.selectNow();
        SelectorFactory.returnSelector(readSelector);
      }
    }
    return n;
  }

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    final Selector selector = provider.openSelector();


    final long timeStart = System.currentTimeMillis();


    final int readyCount = selector.selectNow();


    final long timeFinish = System.currentTimeMillis();


    final long timeDiff = timeFinish - timeStart;

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            if (tmpKey != null)
                tmpKey.cancel();
            
            if ( readSelector != null){
                try{
                    readSelector.selectNow();
                } catch (IOException ex){
                }
                SelectorFactory.returnSelector(readSelector);
            }

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