99 lines
3.8 KiB
Java
99 lines
3.8 KiB
Java
/*
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* Copyright 2021 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer.api.tests.examples.bytetomessagedecoder;
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import io.netty.buffer.api.BufferAllocator;
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import io.netty.buffer.api.Buffer;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.embedded.EmbeddedChannel;
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import org.junit.jupiter.api.Test;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.SplittableRandom;
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import static io.netty.buffer.api.tests.BufferTestSupport.readByteArray;
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import static io.netty.buffer.api.tests.BufferTestSupport.toByteArray;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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public class AlternativeMessageDecoderTest {
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@Test
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public void splitAndParseMessagesDownThePipeline() {
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EmbeddedChannel channel = new EmbeddedChannel(new AlternativeMessageDecoder() {
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@Override
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protected boolean decodeAndFireRead(ChannelHandlerContext ctx, Buffer input) {
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// Can we read our length header?
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if (input.readableBytes() < 4) {
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return false;
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}
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int start = input.readerOffset();
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int length = input.readInt();
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// Can we read the rest of the message?
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if (input.readableBytes() < length) {
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input.readerOffset(start);
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return false;
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}
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// We can read our message in full.
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Buffer messageBuffer = input.split(input.readerOffset() + length);
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ctx.fireChannelRead(messageBuffer);
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return true;
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}
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});
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List<byte[]> messages = new ArrayList<>();
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Buffer messagesBuffer = BufferAllocator.heap().allocate(132 * 1024);
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SplittableRandom rng = new SplittableRandom(42);
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for (int i = 0; i < 1000; i++) {
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byte[] message = new byte[rng.nextInt(4, 256)];
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rng.nextBytes(message);
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message[0] = (byte) (i >> 24);
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message[1] = (byte) (i >> 16);
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message[2] = (byte) (i >> 8);
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message[3] = (byte) i;
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messages.add(message);
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messagesBuffer.ensureWritable(4 + message.length, 1024, false);
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messagesBuffer.writeInt(message.length);
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for (byte b : message) {
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messagesBuffer.writeByte(b);
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}
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}
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while (messagesBuffer.readableBytes() > 0) {
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int length = rng.nextInt(1, Math.min(500, messagesBuffer.readableBytes() + 1));
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if (length == messagesBuffer.readableBytes()) {
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channel.writeInbound(messagesBuffer);
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} else {
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channel.writeInbound(messagesBuffer.split(length));
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}
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}
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Iterator<byte[]> expectedItr = messages.iterator();
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Buffer actualMessage;
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while ((actualMessage = channel.readInbound()) != null) {
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try (Buffer ignore = actualMessage) {
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assertTrue(expectedItr.hasNext());
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assertThat(readByteArray(actualMessage)).containsExactly(expectedItr.next());
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}
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}
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assertFalse(expectedItr.hasNext());
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}
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}
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