Examples of java.nio.channels.SelectableChannel

java.nio.channels.SelectableChannel
A channel that can be multiplexed via a {@link Selector}.
In order to be used with a selector, an instance of this class must first be registered via the {@link #register(Selector,int,Object) register} method. This method returns a new {@link SelectionKey} objectthat represents the channel's registration with the selector.
Once registered with a selector, a channel remains registered until it is deregistered. This involves deallocating whatever resources were allocated to the channel by the selector.
A channel cannot be deregistered directly; instead, the key representing its registration must be cancelled. Cancelling a key requests that the channel be deregistered during the selector's next selection operation. A key may be cancelled explicitly by invoking its {@link SelectionKey#cancel() cancel} method. All of a channel's keys are cancelledimplicitly when the channel is closed, whether by invoking its {@link Channel#close close} method or by interrupting a thread blocked in an I/Ooperation upon the channel.
If the selector itself is closed then the channel will be deregistered, and the key representing its registration will be invalidated, without further delay.
A channel may be registered at most once with any particular selector.
Whether or not a channel is registered with one or more selectors may be determined by invoking the {@link #isRegistered isRegistered} method.
Selectable channels are safe for use by multiple concurrent threads.

Blocking mode
A selectable channel is either in blocking mode or in non-blocking mode. In blocking mode, every I/O operation invoked upon the channel will block until it completes. In non-blocking mode an I/O operation will never block and may transfer fewer bytes than were requested or possibly no bytes at all. The blocking mode of a selectable channel may be determined by invoking its {@link #isBlocking isBlocking} method.
Newly-created selectable channels are always in blocking mode. Non-blocking mode is most useful in conjunction with selector-based multiplexing. A channel must be placed into non-blocking mode before being registered with a selector, and may not be returned to blocking mode until it has been deregistered. @author Mark Reinhold @author JSR-51 Expert Group @version 1.35, 05/11/17 @since 1.4 @see SelectionKey @see Selector

      changes.clear();
    }
  }


  protected void processSelectionKey(SelectionKey key) throws IOException {
    SelectableChannel channel = key.channel();


    if (!key.isValid()) {
      return;
    }

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//        runCounter++;
        LOGGER.log(Level.FINEST, "{0} output handling", debugName);
        try {
            // support for ClientSocketChannelHandler
            if ((cachedReadyOps & SelectionKey.OP_CONNECT) != 0) {
                SelectableChannel channel = selectionKey.channel();
                if (!(channel instanceof SocketChannel)) {
                    throw new IllegalStateException("SelectionKey is "
                            + "connectable but channel is no SocketChannel!");
                }
                if (!(channelHandler instanceof ClientSocketChannelHandler)) {

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        return new IoSessionIterator(selector.selectedKeys());
    }


    @Override
    protected void init(NioSession session) throws Exception {
        SelectableChannel ch = (SelectableChannel) session.getChannel();
        ch.configureBlocking(false);
        session.setSelectionKey(ch.register(selector, SelectionKey.OP_READ, session));
    }

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                wakeupPipe.sink().close();
                wakeupPipe.source().close();
                for(int i = 1; i < totalChannels; i++) { // Deregister channels
                    if (i % MAX_SELECTABLE_FDS != 0) { // skip wakeupEvent
                        deregister(channelArray[i]);
                        SelectableChannel selch = channelArray[i].channel();
                        if (!selch.isOpen() && !selch.isRegistered())
                            ((SelChImpl)selch).kill();
                    }
                }
                pollWrapper.free();
                pollWrapper = null;

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        }
        fdMap.remove(ski); // Remove the key from fdMap, keys and selectedKeys
        keys.remove(ski);
        selectedKeys.remove(ski);
        deregister(ski);
        SelectableChannel selch = ski.channel();
        if (!selch.isOpen() && !selch.isRegistered())
            ((SelChImpl)selch).kill();
    }

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                    if (timeBlocked < minSelectTimeout) {
                        boolean notConnected = false;
                        // loop over all keys as the selector may was unblocked because of a closed channel
                        for (SelectionKey key: selector.keys()) {
                            SelectableChannel ch = key.channel();
                            try {
                                if (ch instanceof DatagramChannel && !ch.isOpen() ||
                                        ch instanceof SocketChannel && !((SocketChannel) ch).isConnected()) {
                                    notConnected = true;
                                    // cancel the key just to be on the safe side
                                    key.cancel();
                                }

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            }
        }
    }


    private boolean isConnected(SelectionKeyImpl key) {
        SelectableChannel channel = key.channel();
        if (channel instanceof SocketChannel) {
            return ((SocketChannel) channel).isConnected();
        }
        return true;
    }

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            for (Iterator<SelectionKey> i = keys.iterator(); i.hasNext();) {
                SelectionKeyImpl key = (SelectionKeyImpl) i.next();
                key.oldInterestOps = key.interestOps();
                boolean isReadableChannel = ((SelectionKey.OP_ACCEPT | SelectionKey.OP_READ) & key.oldInterestOps) != 0;
                boolean isWritableChannel = ((SelectionKey.OP_CONNECT | SelectionKey.OP_WRITE) & key.oldInterestOps) != 0;
                SelectableChannel channel = key.channel();                  
                if (isReadableChannel) {
                    readChannelList.add(channel.keyFor(this));
                    readableFDs.add(((FileDescriptorHandler)channel).getFD());
                }
                if (isWritableChannel) {
                    writeChannelList.add(channel.keyFor(this));
                    writableFDs.add(((FileDescriptorHandler)channel).getFD());
                }
            }
        }
        readableChannels = readChannelList.toArray(new SelectionKey[0]);

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            }
        }
    }


    private boolean isConnected(SelectionKeyImpl key) {
        SelectableChannel channel = key.channel();
        if (channel instanceof SocketChannel) {
            return ((SocketChannel) channel).isConnected();
        }
        return true;
    }

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            for (Iterator<SelectionKey> i = keys.iterator(); i.hasNext();) {
                SelectionKeyImpl key = (SelectionKeyImpl) i.next();
                key.oldInterestOps = key.interestOps();
                boolean isReadableChannel = ((SelectionKey.OP_ACCEPT | SelectionKey.OP_READ) & key.oldInterestOps) != 0;
                boolean isWritableChannel = ((SelectionKey.OP_CONNECT | SelectionKey.OP_WRITE) & key.oldInterestOps) != 0;
                SelectableChannel channel = key.channel();                  
                if (isReadableChannel) {
                    readChannelList.add(channel.keyFor(this));
                    readableFDs.add(((FileDescriptorHandler)channel).getFD());
                }
                if (isWritableChannel) {
                    writeChannelList.add(channel.keyFor(this));
                    writableFDs.add(((FileDescriptorHandler)channel).getFD());
                }
            }
        }
        readableChannels = readChannelList.toArray(new SelectionKey[0]);

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Examples of java.nio.channels.SelectableChannel

Blocking mode

Related Classes of java.nio.channels.SelectableChannel