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tcpExceptionCaught() — netty Function Reference

Architecture documentation for the tcpExceptionCaught() function in PcapWriteHandlerTest.java from the netty codebase.

Function java Buffer Allocators calls 2

Entity Profile

Dependency Diagram

graph TD
  39c4e83d_8291_f4fc_67f9_2ac9c9d08e03["tcpExceptionCaught()"]
  e9f4993c_4935_9405_4fab_0bbc9030a673["PcapWriteHandlerTest"]
  39c4e83d_8291_f4fc_67f9_2ac9c9d08e03 -->|defined in| e9f4993c_4935_9405_4fab_0bbc9030a673
  201e7e9e_c23c_b328_ecb1_117026fc1c03["InetSocketAddress()"]
  39c4e83d_8291_f4fc_67f9_2ac9c9d08e03 -->|calls| 201e7e9e_c23c_b328_ecb1_117026fc1c03
  a21dcafa_3fd5_25fa_9ab3_64ba75a8e86a["verifyTcpHandshakeCapture()"]
  39c4e83d_8291_f4fc_67f9_2ac9c9d08e03 -->|calls| a21dcafa_3fd5_25fa_9ab3_64ba75a8e86a
  style 39c4e83d_8291_f4fc_67f9_2ac9c9d08e03 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

handler/src/test/java/io/netty/handler/pcap/PcapWriteHandlerTest.java lines 827–880

    @Test
    public void tcpExceptionCaught() {
        final ByteBuf pcapBuffer = Unpooled.buffer();
        final RuntimeException exception = new RuntimeException();

        InetSocketAddress serverAddr = new InetSocketAddress("1.1.1.1", 1234);
        InetSocketAddress clientAddr = new InetSocketAddress("2.2.2.2", 3456);

        CloseDetectingByteBufOutputStream outputStream = new CloseDetectingByteBufOutputStream(pcapBuffer);
        final EmbeddedChannel embeddedChannel = new EmbeddedChannel(
                new ChannelInboundHandlerAdapter() {
                    @Override
                    public void channelActive(ChannelHandlerContext ctx) throws Exception {
                        super.channelActive(ctx);

                        ctx.fireExceptionCaught(exception);
                    }
                },
                PcapWriteHandler.builder()
                                .forceTcpChannel(serverAddr, clientAddr, false)
                                .build(outputStream)
        );

        // Verify tcp handshake, tcp rst, and stream close

        assertTrue(outputStream.closeCalled());

        verifyTcpHandshakeCapture(true, pcapBuffer, serverAddr, clientAddr);

        // Verify rst
        ByteBuf tcpPacket = verifyTcpBaseHeaders(pcapBuffer, serverAddr, 0);

        assertEquals(clientAddr.getPort() & 0xffff, tcpPacket.readUnsignedShort()); // Source Port
        assertEquals(serverAddr.getPort() & 0xffff, tcpPacket.readUnsignedShort()); // Destination Port
        assertEquals(1, tcpPacket.readUnsignedInt()); // Sequence number
        assertEquals(1, tcpPacket.readUnsignedInt()); // Ack number
        tcpPacket.readByte(); // Offset/Reserved
        assertEquals(20, tcpPacket.readByte()); // RST control bit
        assertEquals(65535, tcpPacket.readUnsignedShort()); // Window Size
        assertEquals(1, tcpPacket.readUnsignedShort()); // Checksum
        assertEquals(0, tcpPacket.readUnsignedShort()); // Urgent Pointer

        // Verify thrown exception
        try {
            embeddedChannel.checkException();
            fail();
        } catch (Throwable t) {
            assertSame(exception, t);
        } finally {
            pcapBuffer.release();
        }

        assertFalse(embeddedChannel.finishAndReleaseAll());
    }

Domain

Subdomains

Defined In

Calls

Source

Frequently Asked Questions

What does tcpExceptionCaught() do?
tcpExceptionCaught() is a function in the netty codebase, defined in handler/src/test/java/io/netty/handler/pcap/PcapWriteHandlerTest.java.
Where is tcpExceptionCaught() defined?
tcpExceptionCaught() is defined in handler/src/test/java/io/netty/handler/pcap/PcapWriteHandlerTest.java at line 827.
What does tcpExceptionCaught() call?
tcpExceptionCaught() calls 2 function(s): InetSocketAddress, verifyTcpHandshakeCapture.

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