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Java example source code file (DatagramUnicastTest.java)

This example Java source code file (DatagramUnicastTest.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

bindexception, bootstrap, bytes, channel, compositebytebuf, countdownlatch, exception, failed, net, network, object, override, simplechannelinboundhandler, suppresswarnings, test, threading, threads, throwable

The DatagramUnicastTest.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.testsuite.transport.socket;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.CompositeByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import org.junit.Test;

import java.net.BindException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import static org.junit.Assert.*;

public class DatagramUnicastTest extends AbstractDatagramTest {

    private static final byte[] BYTES = {0, 1, 2, 3};
    @Test
    public void testSimpleSendDirectByteBuf() throws Throwable {
        run();
    }

    public void testSimpleSendDirectByteBuf(Bootstrap sb, Bootstrap cb) throws Throwable {
        testSimpleSend0(sb, cb, Unpooled.directBuffer().writeBytes(BYTES), true, BYTES, 1);
        testSimpleSend0(sb, cb, Unpooled.directBuffer().writeBytes(BYTES), true, BYTES, 4);
    }

    @Test
    public void testSimpleSendHeapByteBuf() throws Throwable {
        run();
    }

    public void testSimpleSendHeapByteBuf(Bootstrap sb, Bootstrap cb) throws Throwable {
        testSimpleSend0(sb, cb, Unpooled.buffer().writeBytes(BYTES), true, BYTES, 1);
        testSimpleSend0(sb, cb, Unpooled.buffer().writeBytes(BYTES), true, BYTES, 4);
    }

    @Test
    public void testSimpleSendCompositeDirectByteBuf() throws Throwable {
        run();
    }

    public void testSimpleSendCompositeDirectByteBuf(Bootstrap sb, Bootstrap cb) throws Throwable {
        CompositeByteBuf buf = Unpooled.compositeBuffer();
        buf.addComponent(true, Unpooled.directBuffer().writeBytes(BYTES, 0, 2));
        buf.addComponent(true, Unpooled.directBuffer().writeBytes(BYTES, 2, 2));
        testSimpleSend0(sb, cb, buf, true, BYTES, 1);

        CompositeByteBuf buf2 = Unpooled.compositeBuffer();
        buf2.addComponent(true, Unpooled.directBuffer().writeBytes(BYTES, 0, 2));
        buf2.addComponent(true, Unpooled.directBuffer().writeBytes(BYTES, 2, 2));
        testSimpleSend0(sb, cb, buf2, true, BYTES, 4);
    }

    @Test
    public void testSimpleSendCompositeHeapByteBuf() throws Throwable {
        run();
    }

    public void testSimpleSendCompositeHeapByteBuf(Bootstrap sb, Bootstrap cb) throws Throwable {
        CompositeByteBuf buf = Unpooled.compositeBuffer();
        buf.addComponent(true, Unpooled.buffer().writeBytes(BYTES, 0, 2));
        buf.addComponent(true, Unpooled.buffer().writeBytes(BYTES, 2, 2));
        testSimpleSend0(sb, cb, buf, true, BYTES, 1);

        CompositeByteBuf buf2 = Unpooled.compositeBuffer();
        buf2.addComponent(true, Unpooled.buffer().writeBytes(BYTES, 0, 2));
        buf2.addComponent(true, Unpooled.buffer().writeBytes(BYTES, 2, 2));
        testSimpleSend0(sb, cb, buf2, true, BYTES, 4);
    }

    @Test
    public void testSimpleSendCompositeMixedByteBuf() throws Throwable {
        run();
    }

    public void testSimpleSendCompositeMixedByteBuf(Bootstrap sb, Bootstrap cb) throws Throwable {
        CompositeByteBuf buf = Unpooled.compositeBuffer();
        buf.addComponent(true, Unpooled.directBuffer().writeBytes(BYTES, 0, 2));
        buf.addComponent(true, Unpooled.buffer().writeBytes(BYTES, 2, 2));
        testSimpleSend0(sb, cb, buf, true, BYTES, 1);

        CompositeByteBuf buf2 = Unpooled.compositeBuffer();
        buf2.addComponent(true, Unpooled.directBuffer().writeBytes(BYTES, 0, 2));
        buf2.addComponent(true, Unpooled.buffer().writeBytes(BYTES, 2, 2));
        testSimpleSend0(sb, cb, buf2, true, BYTES, 4);
    }

    @Test
    public void testSimpleSendWithoutBind() throws Throwable {
        run();
    }

    public void testSimpleSendWithoutBind(Bootstrap sb, Bootstrap cb) throws Throwable {
        testSimpleSend0(sb, cb, Unpooled.directBuffer().writeBytes(BYTES), false, BYTES, 1);
        testSimpleSend0(sb, cb, Unpooled.directBuffer().writeBytes(BYTES), false, BYTES, 4);
    }

    @SuppressWarnings("deprecation")
    private void testSimpleSend0(Bootstrap sb, Bootstrap cb, ByteBuf buf, boolean bindClient,
                                 final byte[] bytes, int count)
            throws Throwable {
        final CountDownLatch latch = new CountDownLatch(count);

        sb.handler(new ChannelInitializer<Channel>() {
            @Override
            protected void initChannel(Channel ch) throws Exception {
                ch.pipeline().addLast(new SimpleChannelInboundHandler<DatagramPacket>() {
                    @Override
                    public void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg) throws Exception {
                        ByteBuf buf = msg.content();
                        assertEquals(bytes.length, buf.readableBytes());
                        for (byte b: bytes) {
                            assertEquals(b, buf.readByte());
                        }
                        latch.countDown();
                    }
                });
            }
        });

        cb.handler(new SimpleChannelInboundHandler<Object>() {
            @Override
            public void channelRead0(ChannelHandlerContext ctx, Object msgs) throws Exception {
                // Nothing will be sent.
            }
        });

        Channel sc = null;
        BindException bindFailureCause = null;
        for (int i = 0; i < 3; i ++) {
            try {
                sc = sb.bind().sync().channel();
                break;
            } catch (Exception e) {
                if (e instanceof BindException) {
                    logger.warn("Failed to bind to a free port; trying again", e);
                    bindFailureCause = (BindException) e;
                    refreshLocalAddress(sb);
                } else {
                    throw e;
                }
            }
        }

        if (sc == null) {
            throw bindFailureCause;
        }

        Channel cc;
        if (bindClient) {
            cc = cb.bind().sync().channel();
        } else {
            cb.option(ChannelOption.DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION, true);
            cc = cb.register().sync().channel();
        }

        for (int i = 0; i < count; i++) {
            cc.write(new DatagramPacket(buf.retain().duplicate(), addr));
        }
        // release as we used buf.retain() before
        buf.release();
        cc.flush();
        assertTrue(latch.await(10, TimeUnit.SECONDS));

        sc.close().sync();
        cc.close().sync();
    }
}

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