Examples of io.netty.channel.ChannelHandlerContext

io.netty.channel.ChannelHandlerContext
handler will receive a sequence of increasing integers starting // from 1. {@code @Override}public void messageReceived( {@link ChannelHandlerContext} ctx, {@link Integer} integer) {{@link Attribute}< {@link Integer}> attr = ctx.getAttr(counter); Integer a = ctx.getAttr(counter).get(); if (a == null) { a = 1; } attr.set(a * integer)); } } // Different context objects are given to "f1", "f2", "f3", and "f4" even if // they refer to the same handler instance. Because the FactorialHandler // stores its state in a context object (as an attachment), the factorial is // calculated correctly 4 times once the two pipelines (p1 and p2) are active. FactorialHandler fh = new FactorialHandler(); {@link ChannelPipeline} p1 = {@link Channels}.pipeline(); p1.addLast("f1", fh); p1.addLast("f2", fh); {@link ChannelPipeline} p2 = {@link Channels}.pipeline(); p2.addLast("f3", fh); p2.addLast("f4", fh);
Additional resources worth reading

Please refer to the {@link ChannelHandler}, and {@link ChannelPipeline} to find out more about inbound and outbound operations,what fundamental differences they have, how they flow in a pipeline, and how to handle the operation in your application.

        return session.connectionContext().channel().isActive() || session.inuse();
    }


    @Override
    public void onSockJSServerInitiatedClose(final SockJsSession session) {
        final ChannelHandlerContext context = session.connectionContext();
        if (context != null) { //could be null if the request is aborted, for example due to missing callback.
            if (logger.isDebugEnabled()) {
                logger.debug("Will close session connectionContext {}", session.connectionContext());
            }
            context.close();
        }
        sessions.remove(session.sessionId());
    }

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        }
    }


    @Override
    public void onSockJSServerInitiatedClose(final SockJsSession session) {
        final ChannelHandlerContext context = session.connectionContext();
        if (context != null) { //could be null if the request is aborted, for example due to missing callback.
            logger.debug("Will close session connectionContext " + session.connectionContext());
            context.close();
        }
    }

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    /**
     *
     * Listing 6.2 of <i>Netty in Action</i>
     */
    public static void eventsViaChannel(ChannelHandlerContext context) {
        ChannelHandlerContext ctx = context;
        Channel channel = ctx.channel();
        channel.write(Unpooled.copiedBuffer("Netty in Action",
                CharsetUtil.UTF_8));


    }

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    /**
     *
     * Listing 6.3 of <i>Netty in Action</i>
     */
    public static void eventsViaChannelPipeline(ChannelHandlerContext context) {
        ChannelHandlerContext ctx = context;
        ChannelPipeline pipeline = ctx.pipeline();
        pipeline.write(Unpooled.copiedBuffer("Netty in Action",
                CharsetUtil.UTF_8));


    }

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    /**
     *
     * Listing 6.4 of <i>Netty in Action</i>
     */
    public static void eventsViaChannelHandlerContext(ChannelHandlerContext context) {
        ChannelHandlerContext ctx = context;
        ctx.write(Unpooled.copiedBuffer("Netty in Action",
                CharsetUtil.UTF_8));


    }

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            return buf;
          }
        });
    
    buf.retain();
    ChannelHandlerContext ctx = mockChannelHandlerContext(buf, m2);
    encoder.write(ctx, m1, null);
    Decoder decoder = new Decoder(new DSASignatureFactory());
    decoder.decode(ctx, buf, m1.recipient().createSocketTCP(), m1
        .sender().createSocketTCP());
    return decoder.message();

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   * @return The mocked ChannelHandlerContext
   */
  @SuppressWarnings("unchecked")
  private ChannelHandlerContext mockChannelHandlerContext(
      final AlternativeCompositeByteBuf buf, final AtomicReference<Message> m2) {
    ChannelHandlerContext ctx = mock(ChannelHandlerContext.class);
    ByteBufAllocator alloc = mock(ByteBufAllocator.class);
    when(ctx.alloc()).thenReturn(alloc);
    when(alloc.ioBuffer()).thenReturn(buf);


    DatagramChannel dc = mock(DatagramChannel.class);
    when(ctx.channel()).thenReturn(dc);
    when(ctx.writeAndFlush(any(), any(ChannelPromise.class))).thenReturn(
        null);


    Attribute<InetSocketAddress> attr = mock(Attribute.class);
    when(ctx.attr(any(AttributeKey.class))).thenReturn(attr);


    when(ctx.fireChannelRead(any())).then(new Answer<Void>() {
      @Override
      public Void answer(final InvocationOnMock invocation)
          throws Throwable {
        Object[] args = invocation.getArguments();
        m2.set((Message) args[0]);
        return null;
      }
    });
    
    when(ctx.fireExceptionCaught(any(Throwable.class))).then(new Answer<Void>() {


      @Override
      public Void answer(InvocationOnMock invocation) throws Throwable {
        Object[] args = invocation.getArguments();
        for(Object obj:args) {

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public class WebSocket08FrameDecoderTest {


    @Test
    public void channelInactive() throws Exception {
        final WebSocket08FrameDecoder decoder = new WebSocket08FrameDecoder(true, true, 65535, false);
        final ChannelHandlerContext ctx = EasyMock.createMock(ChannelHandlerContext.class);
        decoder.channelInactive(ctx);
    }

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    }


    @Test
    public void testHttpUpgradeRequest() throws Exception {
        EmbeddedChannel ch = createChannel(new MockOutboundHandler());
        ChannelHandlerContext handshakerCtx = ch.pipeline().context(WebSocketServerProtocolHandshakeHandler.class);
        writeUpgradeRequest(ch);
        assertEquals(SWITCHING_PROTOCOLS, ReferenceCountUtil.releaseLater(responses.remove()).status());
        assertNotNull(WebSocketServerProtocolHandler.getHandshaker(handshakerCtx));
    }

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        channel.writeAndFlush(request).addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) {
                if (future.isSuccess()) {
                    ChannelPipeline p = future.channel().pipeline();
                    ChannelHandlerContext ctx = p.context(HttpRequestEncoder.class);
                    if (ctx == null) {
                        ctx = p.context(HttpClientCodec.class);
                    }
                    if (ctx == null) {
                        promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
                                "a HttpRequestEncoder or HttpClientCodec"));
                        return;
                    }
                    p.addAfter(ctx.name(), "ws-encoder", newWebSocketEncoder());


                    promise.setSuccess();
                } else {
                    promise.setFailure(future.cause());
                }

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Examples of io.netty.channel.ChannelHandlerContext

Additional resources worth reading

Related Classes of io.netty.channel.ChannelHandlerContext