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

            // running.


            // clean up the key in the selector
            try {
                if (key != null) key.cancel();
                if (selector != null) selector.selectNow();
            } catch (Exception e) {
                // ignore
            }


            // shut down and null out the selector

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            if (readSelector!=null)
            {
                // Bug 6403933
                try
                {
                    readSelector.selectNow();
                }
                catch (IOException ex)
                {
                    ;
                }

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                int code = 0;
                if (timeout > 0) {
                    code = readSelector.select(timeout);
                } else {
                    code = readSelector.selectNow();
                }
                tmpKey.interestOps(
                    tmpKey.interestOps() & (~SelectionKey.OP_READ));


                if (code == 0){

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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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  }


  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) {
        // Cancel the key.
        writeSelector.selectNow();
        SelectorFactory.returnSelector(writeSelector);
      }
    }
    this.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 readCount;
  }

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                            }
                        }
                        break;
                    }
                    if (_scheduler.numRunnables() > 0) {
                        n = sel.selectNow();
                    } else {
                        n = sel.select();
                    }
                } catch (IOException ignore) {
                    n = 0;

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        assertTrue(key.isValid());
        assertFalse(key.isReadable());
        assertEquals(0,key.readyOps());


        // try selecting and assert nothing selected
        int selected = selector.selectNow();
        assertEquals(0,selected);
        assertEquals(0,selector.selectedKeys().size());
        assertTrue(key.isValid());
        assertFalse(key.isReadable());
        assertEquals(0,key.readyOps());

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            long selectDeadLineNanos = currentTimeNanos + delayNanos(currentTimeNanos);
            for (;;) {
                long timeoutMillis = (selectDeadLineNanos - currentTimeNanos + 500000L) / 1000000L;
                if (timeoutMillis <= 0) {
                    if (selectCnt == 0) {
                        selector.selectNow();
                        selectCnt = 1;
                    }
                    break;
                }

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