Java example source code file (SnappyFrameDecoderTest.java)

This example Java source code file (SnappyFrameDecoderTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

before, bytebuf, embeddedchannel, exception, snappyframedecoder, snappyframedecodertest, test

The SnappyFrameDecoderTest.java Java example source code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec.compression;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.embedded.EmbeddedChannel;
import org.junit.Before;
import org.junit.Test;

import static io.netty.util.ReferenceCountUtil.releaseLater;
import static org.junit.Assert.*;

public class SnappyFrameDecoderTest {
    private EmbeddedChannel channel;

    @Before
    public void initChannel() {
        channel = new EmbeddedChannel(new SnappyFrameDecoder());
    }

    @Test(expected = DecompressionException.class)
    public void testReservedUnskippableChunkTypeCausesError() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
            0x03, 0x01, 0x00, 0x00, 0x00
        });

        channel.writeInbound(in);
    }

    @Test(expected = DecompressionException.class)
    public void testInvalidStreamIdentifierLength() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
            -0x80, 0x05, 0x00, 0x00, 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);
    }

    @Test(expected = DecompressionException.class)
    public void testInvalidStreamIdentifierValue() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
            (byte) 0xff, 0x06, 0x00, 0x00, 's', 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);
    }

    @Test(expected = DecompressionException.class)
    public void testReservedSkippableBeforeStreamIdentifier() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
            -0x7f, 0x06, 0x00, 0x00, 's', 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);
    }

    @Test(expected = DecompressionException.class)
    public void testUncompressedDataBeforeStreamIdentifier() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
            0x01, 0x05, 0x00, 0x00, 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);
    }

    @Test(expected = DecompressionException.class)
    public void testCompressedDataBeforeStreamIdentifier() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
            0x00, 0x05, 0x00, 0x00, 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);
    }

    @Test
    public void testReservedSkippableSkipsInput() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
           (byte) 0xff, 0x06, 0x00, 0x00, 0x73, 0x4e, 0x61, 0x50, 0x70, 0x59,
           -0x7f, 0x05, 0x00, 0x00, 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);
        assertNull(channel.readInbound());

        assertFalse(in.isReadable());
    }

    @Test
    public void testUncompressedDataAppendsToOut() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
           (byte) 0xff, 0x06, 0x00, 0x00, 0x73, 0x4e, 0x61, 0x50, 0x70, 0x59,
            0x01, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);

        ByteBuf expected = Unpooled.wrappedBuffer(new byte[] { 'n', 'e', 't', 't', 'y' });
        assertEquals(releaseLater(expected), releaseLater(channel.readInbound()));
    }

    @Test
    public void testCompressedDataDecodesAndAppendsToOut() throws Exception {
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
           (byte) 0xff, 0x06, 0x00, 0x00, 0x73, 0x4e, 0x61, 0x50, 0x70, 0x59,
            0x00, 0x0B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                  0x05, // preamble length
                  0x04 << 2, // literal tag + length
                  0x6e, 0x65, 0x74, 0x74, 0x79 // "netty"
        });

        channel.writeInbound(in);

        ByteBuf expected = Unpooled.wrappedBuffer(new byte[] { 'n', 'e', 't', 't', 'y' });
        assertEquals(releaseLater(expected), releaseLater(channel.readInbound()));
    }

    // The following two tests differ in only the checksum provided for the literal
    // uncompressed string "netty"

    @Test(expected = DecompressionException.class)
    public void testInvalidChecksumThrowsException() throws Exception {
        EmbeddedChannel channel = new EmbeddedChannel(new SnappyFrameDecoder(true));

        // checksum here is presented as 0
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
           (byte) 0xff, 0x06, 0x00, 0x00, 0x73, 0x4e, 0x61, 0x50, 0x70, 0x59,
            0x01, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);
    }

    @Test
    public void testInvalidChecksumDoesNotThrowException() throws Exception {
        EmbeddedChannel channel = new EmbeddedChannel(new SnappyFrameDecoder(true));

        // checksum here is presented as a282986f (little endian)
        ByteBuf in = Unpooled.wrappedBuffer(new byte[] {
           (byte) 0xff, 0x06, 0x00, 0x00, 0x73, 0x4e, 0x61, 0x50, 0x70, 0x59,
            0x01, 0x09, 0x00, 0x00, 0x6f, -0x68, -0x7e, -0x5e, 'n', 'e', 't', 't', 'y'
        });

        channel.writeInbound(in);
    }
}