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.

    public ChannelFuture close(ChannelPromise future) {
        return finishEncode(ctx(), future);
    }


    private ChannelHandlerContext ctx() {
        ChannelHandlerContext ctx = this.ctx;
        if (ctx == null) {
            throw new IllegalStateException("not added to a pipeline");
        }
        return ctx;
    }

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            }
        }
    }


    public ChannelFuture close() {
        ChannelHandlerContext ctx = this.ctx;
        if (ctx == null) {
            throw new IllegalStateException("not added to a pipeline");
        }
        return finishEncode(ctx, null);
    }

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    /**
     * Continues to fetch the chunks from the input.
     */
    public void resumeTransfer() {
        final ChannelHandlerContext ctx = this.ctx;
        if (ctx == null) {
            return;
        }
        if (ctx.executor().inEventLoop()) {
            try {
                doFlush(ctx);
            } catch (Exception e) {
                if (logger.isWarnEnabled()) {
                    logger.warn("Unexpected exception while sending chunks.", e);
                }
            }
        } else {
            // let the transfer resume on the next event loop round
            ctx.executor().execute(new Runnable() {


                @Override
                public void run() {
                    try {
                        doFlush(ctx);

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    /**
     * Continues to fetch the chunks from the input.
     */
    public void resumeTransfer() {
        final ChannelHandlerContext ctx = this.ctx;
        if (ctx == null) {
            return;
        }
        if (ctx.executor().inEventLoop()) {
            try {
                doFlush(ctx);
            } catch (Exception e) {
                if (logger.isWarnEnabled()) {
                    logger.warn("Unexpected exception while sending chunks.", e);
                }
            }
        } else {
            // let the transfer resume on the next event loop round
            ctx.executor().execute(new Runnable() {


                @Override
                public void run() {
                    try {
                        doFlush(ctx);

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    /**
     * See {@link #close()}
     */
    public ChannelFuture close(final ChannelPromise future) {
        final ChannelHandlerContext ctx = this.ctx;
        ctx.executor().execute(new Runnable() {
            @Override
            public void run() {
                engine.closeOutbound();
                try {
                    write(ctx, Unpooled.EMPTY_BUFFER, future);

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                // Enqueue the remaining data (will be the first frame queued)
                spdySession.putPendingWrite(streamId, new SpdySession.PendingWrite(spdyDataFrame, promise));


                // The transfer window size is pre-decremented when sending a data frame downstream.
                // Close the session on write failures that leave the transfer window in a corrupt state.
                final ChannelHandlerContext context = ctx;
                ctx.write(partialDataFrame).addListener(new ChannelFutureListener() {
                    @Override
                    public void operationComplete(ChannelFuture future) throws Exception {
                        if (!future.isSuccess()) {
                            issueSessionError(context, SpdySessionStatus.INTERNAL_ERROR);
                        }
                    }
                });
                return;
            } else {
                // Window size is large enough to send entire data frame
                spdySession.updateSendWindowSize(streamId, -1 * dataLength);
                spdySession.updateSendWindowSize(SPDY_SESSION_STREAM_ID, -1 * dataLength);


                // The transfer window size is pre-decremented when sending a data frame downstream.
                // Close the session on write failures that leave the transfer window in a corrupt state.
                final ChannelHandlerContext context = ctx;
                promise.addListener(new ChannelFutureListener() {
                    @Override
                    public void operationComplete(ChannelFuture future) throws Exception {
                        if (!future.isSuccess()) {
                            issueSessionError(context, SpdySessionStatus.INTERNAL_ERROR);

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    }
  }


  public X509Certificate[] getPeerCertificateChain() throws SSLPeerUnverifiedException {
    if (isSSL()) {
      final ChannelHandlerContext sslHandlerContext = channel.pipeline().context("ssl");
      assert sslHandlerContext != null;
      final SslHandler sslHandler = (SslHandler) sslHandlerContext.handler();
      return sslHandler.engine().getSession().getPeerCertificateChain();
    } else {
      return null;
    }
  }

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    private SockJsSessionContext newSessionContext(final boolean active) {
        final Channel channel = mock(Channel.class);
        when(channel.isActive()).thenReturn(active);
        when(channel.isRegistered()).thenReturn(active);
        final ChannelHandlerContext ctx = mock(ChannelHandlerContext.class);
        when(ctx.channel()).thenReturn(channel);
        final SockJsSessionContext sessionContext = mock(SockJsSessionContext.class);
        when(sessionContext.getContext()).thenReturn(ctx);
        return sessionContext;
    }

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        return new DefaultSimplePushServer(store, config, privateKey);
    }


    @SuppressWarnings( { "rawtypes", "unchecked" })
    private ChannelHandlerContext channelHandlerContext() {
        final ChannelHandlerContext ctx = mock(ChannelHandlerContext.class);
        final EventExecutor eventExecutor = mock(EventExecutor.class);
        final ScheduledFuture future = mock(ScheduledFuture.class);
        when(eventExecutor.scheduleAtFixedRate(any(Runnable.class), anyLong(), anyLong(), any(TimeUnit.class))).thenReturn(future);
        when(ctx.executor()).thenReturn(eventExecutor);
        when(ctx.pipeline()).thenReturn(mock(ChannelPipeline.class));
        return ctx;
    }

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        flushMessages(ctx, session);
    }


    @Override
    public ChannelHandlerContext getSendingContext(SockJsSession session) {
        final ChannelHandlerContext openContext = session.openContext();
        return openContext == null ? session.connectionContext() : openContext;
    }

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Examples of io.netty.channel.ChannelHandlerContext

Additional resources worth reading

Related Classes of io.netty.channel.ChannelHandlerContext