Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF 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 org.apache.activemq.artemis.tests.integration.transports.netty; import java.util.ArrayList; import java.util.List; import java.util.Random; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.embedded.EmbeddedChannel; import org.apache.activemq.artemis.tests.util.ServiceTestBase; import org.apache.activemq.artemis.core.remoting.impl.netty.ActiveMQFrameDecoder2; import org.junit.After; import org.junit.Assert; import org.junit.Before; import org.junit.Test; public class ActiveMQFrameDecoder2Test extends ServiceTestBase { private static final int MSG_CNT = 10000; private static final int MSG_LEN = 1000; private static final int FRAGMENT_MAX_LEN = 1500; private static final Random rand = new Random(); @Before public void setUp() throws Exception { super.setUp(); } @After public void tearDown() throws Exception { super.tearDown(); } @Test public void testOrdinaryFragmentation() throws Exception { final EmbeddedChannel decoder = new EmbeddedChannel(new ActiveMQFrameDecoder2()); final byte[] data = new byte[ActiveMQFrameDecoder2Test.MSG_LEN]; ActiveMQFrameDecoder2Test.rand.nextBytes(data); ByteBuf src = Unpooled.buffer(ActiveMQFrameDecoder2Test.MSG_CNT * (ActiveMQFrameDecoder2Test.MSG_LEN + 4)); while (src.writerIndex() < src.capacity()) { src.writeInt(ActiveMQFrameDecoder2Test.MSG_LEN); src.writeBytes(data); } List<ByteBuf> packets = new ArrayList<ByteBuf>(); while (src.isReadable()) { int length = Math.min( ActiveMQFrameDecoder2Test.rand.nextInt(ActiveMQFrameDecoder2Test.FRAGMENT_MAX_LEN), src.readableBytes()); packets.add(src.readBytes(length)); } int cnt = 0; for (ByteBuf p : packets) { decoder.writeInbound(p); for (;;) { ByteBuf frame = (ByteBuf) decoder.readInbound(); if (frame == null) { break; } Assert.assertEquals(4, frame.readerIndex()); Assert.assertEquals(ActiveMQFrameDecoder2Test.MSG_LEN, frame.readableBytes()); Assert.assertEquals(Unpooled.wrappedBuffer(data), frame); cnt++; frame.release(); } } Assert.assertEquals(ActiveMQFrameDecoder2Test.MSG_CNT, cnt); } @Test public void testExtremeFragmentation() throws Exception { final EmbeddedChannel decoder = new EmbeddedChannel(new ActiveMQFrameDecoder2()); decoder.writeInbound(Unpooled.wrappedBuffer(new byte[] { 0 })); Assert.assertNull(decoder.readInbound()); decoder.writeInbound(Unpooled.wrappedBuffer(new byte[] { 0 })); Assert.assertNull(decoder.readInbound()); decoder.writeInbound(Unpooled.wrappedBuffer(new byte[] { 0 })); Assert.assertNull(decoder.readInbound()); decoder.writeInbound(Unpooled.wrappedBuffer(new byte[] { 4 })); Assert.assertNull(decoder.readInbound()); decoder.writeInbound(Unpooled.wrappedBuffer(new byte[] { 5 })); Assert.assertNull(decoder.readInbound()); decoder.writeInbound(Unpooled.wrappedBuffer(new byte[] { 6 })); Assert.assertNull(decoder.readInbound()); decoder.writeInbound(Unpooled.wrappedBuffer(new byte[] { 7 })); Assert.assertNull(decoder.readInbound()); decoder.writeInbound(Unpooled.wrappedBuffer(new byte[] { 8 })); ByteBuf frame = (ByteBuf) decoder.readInbound(); Assert.assertEquals(4, frame.readerIndex()); Assert.assertEquals(4, frame.readableBytes()); Assert.assertEquals(5, frame.getByte(4)); Assert.assertEquals(6, frame.getByte(5)); Assert.assertEquals(7, frame.getByte(6)); Assert.assertEquals(8, frame.getByte(7)); frame.release(); } }