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testFragmentedFrame() — netty Function Reference

Architecture documentation for the testFragmentedFrame() function in PerMessageDeflateDecoderTest.java from the netty codebase.

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Dependency Diagram

graph TD
  44dce2ef_faab_627a_b1bc_dc20c2c70ded["testFragmentedFrame()"]
  5fb9cabd_f848_d24f_11ed_16ea8470984d["PerMessageDeflateDecoderTest"]
  44dce2ef_faab_627a_b1bc_dc20c2c70ded -->|defined in| 5fb9cabd_f848_d24f_11ed_16ea8470984d
  style 44dce2ef_faab_627a_b1bc_dc20c2c70ded fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

codec-http/src/test/java/io/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateDecoderTest.java lines 110–158

    @Test
    public void testFragmentedFrame() {
        EmbeddedChannel encoderChannel = new EmbeddedChannel(
                ZlibCodecFactory.newZlibEncoder(ZlibWrapper.NONE, 9, 15, 8));
        EmbeddedChannel decoderChannel = new EmbeddedChannel(new PerMessageDeflateDecoder(false, 0));

        // initialize
        byte[] payload = new byte[300];
        random.nextBytes(payload);

        assertTrue(encoderChannel.writeOutbound(Unpooled.wrappedBuffer(payload)));
        ByteBuf compressedPayload = encoderChannel.readOutbound();
        compressedPayload = compressedPayload.slice(0, compressedPayload.readableBytes() - 4);

        int oneThird = compressedPayload.readableBytes() / 3;
        BinaryWebSocketFrame compressedFrame1 = new BinaryWebSocketFrame(false,
                WebSocketExtension.RSV1 | WebSocketExtension.RSV3,
                compressedPayload.slice(0, oneThird));
        ContinuationWebSocketFrame compressedFrame2 = new ContinuationWebSocketFrame(false,
                WebSocketExtension.RSV3, compressedPayload.slice(oneThird, oneThird));
        ContinuationWebSocketFrame compressedFrame3 = new ContinuationWebSocketFrame(true,
                WebSocketExtension.RSV3, compressedPayload.slice(oneThird * 2,
                        compressedPayload.readableBytes() - oneThird * 2));

        // execute
        assertTrue(decoderChannel.writeInbound(compressedFrame1.retain()));
        assertTrue(decoderChannel.writeInbound(compressedFrame2.retain()));
        assertTrue(decoderChannel.writeInbound(compressedFrame3));
        BinaryWebSocketFrame uncompressedFrame1 = decoderChannel.readInbound();
        ContinuationWebSocketFrame uncompressedFrame2 = decoderChannel.readInbound();
        ContinuationWebSocketFrame uncompressedFrame3 = decoderChannel.readInbound();

        // test
        assertNotNull(uncompressedFrame1);
        assertNotNull(uncompressedFrame2);
        assertNotNull(uncompressedFrame3);
        assertEquals(WebSocketExtension.RSV3, uncompressedFrame1.rsv());
        assertEquals(WebSocketExtension.RSV3, uncompressedFrame2.rsv());
        assertEquals(WebSocketExtension.RSV3, uncompressedFrame3.rsv());

        ByteBuf finalPayloadWrapped = Unpooled.wrappedBuffer(uncompressedFrame1.content(),
                uncompressedFrame2.content(), uncompressedFrame3.content());
        assertEquals(300, finalPayloadWrapped.readableBytes());

        byte[] finalPayload = new byte[300];
        finalPayloadWrapped.readBytes(finalPayload);
        assertArrayEquals(finalPayload, payload);
        finalPayloadWrapped.release();
    }

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Frequently Asked Questions

What does testFragmentedFrame() do?
testFragmentedFrame() is a function in the netty codebase, defined in codec-http/src/test/java/io/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateDecoderTest.java.
Where is testFragmentedFrame() defined?
testFragmentedFrame() is defined in codec-http/src/test/java/io/netty/handler/codec/http/websocketx/extensions/compression/PerMessageDeflateDecoderTest.java at line 110.

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