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

                            selectCnt);


                    rebuildSelector();


                    // Select again to populate selectedKeys.
                    selector.selectNow();
                    selectCnt = 1;
                    break;
                }


                currentTimeNanos = System.nanoTime();

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            for (int i = 0; i < selectors.size(); i++) {
                Selector selector = selectors.get(i);
                // if it is a JDK selector, cache it
                if (selector.provider() == SelectorProvider.provider()) {
                    // clear cancelled keys (with selectNow) and return to pool
                    selector.selectNow();
                    context.runtime.getSelectorPool().put(selector);
                } else {
                    selector.close();
                }
            }

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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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                    rebuildSelector();
                    selector = this.selector;


                    // Select again to populate selectedKeys.
                    selector.selectNow();
                    selectCnt = 1;
                    break;
                }


                currentTimeNanos = time;

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                !selectorRunner.getPostponedTasks().isEmpty();
        
        if (!hasPostponedTasks) {
            hasSelectedKeys = selector.select(selectTimeout) > 0;
        } else {
            hasSelectedKeys = selector.selectNow() > 0;
        }


        if (IS_WORKAROUND_SELECTOR_SPIN) {
            selectorRunner.checkSelectorSpin(
                    hasSelectedKeys || hasPostponedTasks,

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    finally
    {
      if (key.isValid())
      {
        key.cancel();
        selector.selectNow();
      }
    }
  }

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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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                    rebuildSelector();
                    selector = this.selector;


                    // Select again to populate selectedKeys.
                    selector.selectNow();
                    selectCnt = 1;
                    break;
                }


                currentTimeNanos = time;

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                !selectorRunner.getPostponedTasks().isEmpty();
        
        if (!hasPostponedTasks) {
            hasSelectedKeys = selector.select(selectTimeout) > 0;
        } else {
            hasSelectedKeys = selector.selectNow() > 0;
        }


        if (IS_WORKAROUND_SELECTOR_SPIN) {
            selectorRunner.checkSelectorSpin(
                    hasSelectedKeys || hasPostponedTasks,

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        Selector serverSelector = Selector.open();
        ServerSocketChannel server = ServerSocketChannel.open();
        server.configureBlocking(false);
        server.socket().bind(address, 5000);
        server.register(serverSelector, SelectionKey.OP_ACCEPT);
        serverSelector.selectNow();


        log("Setting up client");
        ClientThread client = new ClientThread(address);
        client.start();
        Thread.sleep(100);

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