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Java example source code file (SocketRstTest.java)

This example Java source code file (SocketRstTest.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

abstractsockettest, atomicreference, bootstrap, channel, channelinboundhandleradapter, channelinitializer, countdownlatch, exception, ioexception, override, socketrsttest, test, threading, threads, throwable, util

The SocketRstTest.java Java example source code

/*
 * Copyright 2016 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.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import org.junit.Test;

import java.io.IOException;
import java.util.Locale;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;

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

public class SocketRstTest extends AbstractSocketTest {
    protected void assertRstOnCloseException(IOException cause, Channel clientChannel) {
        if (Locale.getDefault() == Locale.US || Locale.getDefault() == Locale.UK) {
            assertTrue("actual message: " + cause.getMessage(),
                       cause.getMessage().contains("reset") || cause.getMessage().contains("closed"));
        }
    }

    @Test(timeout = 3000)
    public void testSoLingerZeroCausesOnlyRstOnClose() throws Throwable {
        run();
    }

    public void testSoLingerZeroCausesOnlyRstOnClose(ServerBootstrap sb, Bootstrap cb) throws Throwable {
        final AtomicReference<Channel> serverChannelRef = new AtomicReference();
        final AtomicReference<Throwable> throwableRef = new AtomicReference();
        final CountDownLatch latch = new CountDownLatch(1);
        final CountDownLatch latch2 = new CountDownLatch(1);
        // SO_LINGER=0 means that we must send ONLY a RST when closing (not a FIN + RST).
        sb.childOption(ChannelOption.SO_LINGER, 0);
        sb.childHandler(new ChannelInitializer<Channel>() {
            @Override
            protected void initChannel(Channel ch) throws Exception {
                serverChannelRef.compareAndSet(null, ch);
                latch.countDown();
            }
        });
        cb.handler(new ChannelInitializer<Channel>() {
            @Override
            protected void initChannel(Channel ch) throws Exception {
                ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {
                    @Override
                    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
                        throwableRef.compareAndSet(null, cause);
                    }

                    @Override
                    public void channelInactive(ChannelHandlerContext ctx) {
                        latch2.countDown();
                    }
                });
            }
        });
        Channel sc = sb.bind().sync().channel();
        Channel cc = cb.connect(sc.localAddress()).sync().channel();

        // Wait for the server to get setup.
        latch.await();

        // The server has SO_LINGER=0 and so it must send a RST when close is called.
        serverChannelRef.get().close();

        // Wait for the client to get channelInactive.
        latch2.await();

        // Verify the client received a RST.
        Throwable cause = throwableRef.get();
        assertTrue("actual [type, message]: [" + cause.getClass() + ", " + cause.getMessage() + "]",
                   cause instanceof IOException);
        assertRstOnCloseException((IOException) cause, cc);
    }

    @Test(timeout = 3000)
    public void testNoRstIfSoLingerOnClose() throws Throwable {
        run();
    }

    public void testNoRstIfSoLingerOnClose(ServerBootstrap sb, Bootstrap cb) throws Throwable {
        final AtomicReference<Channel> serverChannelRef = new AtomicReference();
        final AtomicReference<Throwable> throwableRef = new AtomicReference();
        final CountDownLatch latch = new CountDownLatch(1);
        final CountDownLatch latch2 = new CountDownLatch(1);
        sb.childHandler(new ChannelInitializer<Channel>() {
            @Override
            protected void initChannel(Channel ch) throws Exception {
                serverChannelRef.compareAndSet(null, ch);
                latch.countDown();
            }
        });
        cb.handler(new ChannelInitializer<Channel>() {
            @Override
            protected void initChannel(Channel ch) throws Exception {
                ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {
                    @Override
                    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
                        throwableRef.compareAndSet(null, cause);
                    }

                    @Override
                    public void channelInactive(ChannelHandlerContext ctx) {
                        latch2.countDown();
                    }
                });
            }
        });
        Channel sc = sb.bind().sync().channel();
        cb.connect(sc.localAddress()).syncUninterruptibly();

        // Wait for the server to get setup.
        latch.await();

        // The server has SO_LINGER=0 and so it must send a RST when close is called.
        serverChannelRef.get().close();

        // Wait for the client to get channelInactive.
        latch2.await();

        // Verify the client did not received a RST.
        assertNull(throwableRef.get());
    }
}

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