ResolveAddressHandlerTest Class — netty Architecture

Source Code

handler/src/test/java/io/netty/handler/address/ResolveAddressHandlerTest.java lines 49–143

public class ResolveAddressHandlerTest {

    private static final LocalAddress UNRESOLVED = new LocalAddress("unresolved-" + UUID.randomUUID());
    private static final LocalAddress RESOLVED = new LocalAddress("resolved-" + UUID.randomUUID());
    private static final Exception ERROR = new UnknownHostException();

    private static EventLoopGroup group;

    @BeforeAll
    public static void createEventLoop() {
        group = new MultiThreadIoEventLoopGroup(LocalIoHandler.newFactory());
    }

    @AfterAll
    public static void destroyEventLoop() {
        if (group != null) {
            group.shutdownGracefully();
        }
    }

    @Test
    public void testResolveSuccessful() {
        testResolve(false);
    }

    @Test
    public void testResolveFails() {
        testResolve(true);
    }

    private static void testResolve(boolean fail) {
        AddressResolverGroup<SocketAddress> resolverGroup = new TestResolverGroup(fail);
        Bootstrap cb = new Bootstrap();
        cb.group(group).channel(LocalChannel.class).handler(new ResolveAddressHandler(resolverGroup));

        ServerBootstrap sb = new ServerBootstrap();
        sb.group(group)
                .channel(LocalServerChannel.class)
                .childHandler(new ChannelInboundHandlerAdapter() {
                    @Override
                    public void channelActive(ChannelHandlerContext ctx) {
                        ctx.close();
                    }
                });

        // Start server
        Channel sc = sb.bind(RESOLVED).syncUninterruptibly().channel();
        ChannelFuture future = cb.connect(UNRESOLVED).awaitUninterruptibly();
        try {
            if (fail) {
                assertSame(ERROR, future.cause());
            } else {
                assertTrue(future.isSuccess());
            }
            future.channel().close().syncUninterruptibly();
        } finally {
            future.channel().close().syncUninterruptibly();
            sc.close().syncUninterruptibly();
            resolverGroup.close();
        }
    }

    private static final class TestResolverGroup extends AddressResolverGroup<SocketAddress> {
        private final boolean fail;

        TestResolverGroup(boolean fail) {
            this.fail = fail;
        }

        @Override
        protected AddressResolver<SocketAddress> newResolver(EventExecutor executor) {
            return new AbstractAddressResolver<SocketAddress>(executor) {
                @Override
                protected boolean doIsResolved(SocketAddress address) {
                    return address == RESOLVED;
                }

                @Override
                protected void doResolve(SocketAddress unresolvedAddress, Promise<SocketAddress> promise) {
                    assertSame(UNRESOLVED, unresolvedAddress);
                    if (fail) {