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Java example source code file (AbstractEncoderTest.java)

This example Java source code file (AbstractEncoderTest.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

abstractcompressiontest, abstractencodertest, before, bytebuf, compositebytebuf, datapoints, embeddedchannel, exception, theory

The AbstractEncoderTest.java Java example source code

/*
 * Copyright 2014 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.CompositeByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.embedded.EmbeddedChannel;
import org.junit.Before;
import org.junit.experimental.theories.DataPoints;
import org.junit.experimental.theories.FromDataPoints;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;
import org.junit.runner.RunWith;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

@RunWith(Theories.class)
public abstract class AbstractEncoderTest extends AbstractCompressionTest {

    protected EmbeddedChannel channel;

    /**
     * Decompresses data with some external library.
     */
    protected abstract ByteBuf decompress(ByteBuf compressed, int originalLength) throws Exception;

    @Before
    public abstract void initChannel();

    @DataPoints("smallData")
    public static ByteBuf[] smallData() {
        ByteBuf heap = Unpooled.wrappedBuffer(BYTES_SMALL);
        ByteBuf direct = Unpooled.directBuffer(BYTES_SMALL.length);
        direct.writeBytes(BYTES_SMALL);
        return new ByteBuf[] {heap, direct};
    }

    @DataPoints("largeData")
    public static ByteBuf[] largeData() {
        ByteBuf heap = Unpooled.wrappedBuffer(BYTES_LARGE);
        ByteBuf direct = Unpooled.directBuffer(BYTES_LARGE.length);
        direct.writeBytes(BYTES_LARGE);
        return new ByteBuf[] {heap, direct};
    }

    @Theory
    public void testCompressionOfSmallChunkOfData(@FromDataPoints("smallData") ByteBuf data) throws Exception {
        testCompression(data);
    }

    @Theory
    public void testCompressionOfLargeChunkOfData(@FromDataPoints("largeData") ByteBuf data) throws Exception {
        testCompression(data);
    }

    @Theory
    public void testCompressionOfBatchedFlowOfData(@FromDataPoints("largeData") ByteBuf data) throws Exception {
        testCompressionOfBatchedFlow(data);
    }

    protected void testCompression(final ByteBuf data) throws Exception {
        final int dataLength = data.readableBytes();
        assertTrue(channel.writeOutbound(data.retain()));
        assertTrue(channel.finish());

        ByteBuf decompressed = readDecompressed(dataLength);
        assertEquals(data.resetReaderIndex(), decompressed);

        decompressed.release();
        data.release();
    }

    protected void testCompressionOfBatchedFlow(final ByteBuf data) throws Exception {
        final int dataLength = data.readableBytes();
        int written = 0, length = rand.nextInt(100);
        while (written + length < dataLength) {
            ByteBuf in = data.retainedSlice(written, length);
            assertTrue(channel.writeOutbound(in));
            written += length;
            length = rand.nextInt(100);
        }
        ByteBuf in = data.retainedSlice(written, dataLength - written);
        assertTrue(channel.writeOutbound(in));
        assertTrue(channel.finish());

        ByteBuf decompressed = readDecompressed(dataLength);
        assertEquals(data, decompressed);

        decompressed.release();
        data.release();
    }

    protected ByteBuf readDecompressed(final int dataLength) throws Exception {
        CompositeByteBuf compressed = Unpooled.compositeBuffer();
        ByteBuf msg;
        while ((msg = channel.readOutbound()) != null) {
            compressed.addComponent(true, msg);
        }
        ByteBuf decompressed =  decompress(compressed, dataLength);
        compressed.release();
        return decompressed;
    }
}

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