InetSocketAddressResolver Class — netty Architecture

Source Code

resolver/src/main/java/io/netty/resolver/InetSocketAddressResolver.java lines 31–90

public class InetSocketAddressResolver extends AbstractAddressResolver<InetSocketAddress> {

    final NameResolver<InetAddress> nameResolver;

    /**
     * @param executor the {@link EventExecutor} which is used to notify the listeners of the {@link Future} returned
     *                 by {@link #resolve(java.net.SocketAddress)}
     * @param nameResolver the {@link NameResolver} used for name resolution
     */
    public InetSocketAddressResolver(EventExecutor executor, NameResolver<InetAddress> nameResolver) {
        super(executor, InetSocketAddress.class);
        this.nameResolver = nameResolver;
    }

    @Override
    protected boolean doIsResolved(InetSocketAddress address) {
        return !address.isUnresolved();
    }

    @Override
    protected void doResolve(final InetSocketAddress unresolvedAddress, final Promise<InetSocketAddress> promise)
            throws Exception {
        // Note that InetSocketAddress.getHostName() will never incur a reverse lookup here,
        // because an unresolved address always has a host name.
        nameResolver.resolve(unresolvedAddress.getHostName())
                .addListener((FutureListener<InetAddress>) future -> {
                    if (future.isSuccess()) {
                        promise.setSuccess(new InetSocketAddress(future.getNow(), unresolvedAddress.getPort()));
                    } else {
                        promise.setFailure(future.cause());
                    }
                });
    }

    @Override
    protected void doResolveAll(final InetSocketAddress unresolvedAddress,
                                final Promise<List<InetSocketAddress>> promise) throws Exception {
        // Note that InetSocketAddress.getHostName() will never incur a reverse lookup here,
        // because an unresolved address always has a host name.
        nameResolver.resolveAll(unresolvedAddress.getHostName())
                .addListener((FutureListener<List<InetAddress>>) future -> {
                    if (future.isSuccess()) {
                        List<InetAddress> inetAddresses = future.getNow();
                        List<InetSocketAddress> socketAddresses =
                                new ArrayList<InetSocketAddress>(inetAddresses.size());
                        for (InetAddress inetAddress : inetAddresses) {
                            socketAddresses.add(new InetSocketAddress(inetAddress, unresolvedAddress.getPort()));
                        }
                        promise.setSuccess(socketAddresses);
                    } else {
                        promise.setFailure(future.cause());
                    }
                });
    }

    @Override
    public void close() {
        nameResolver.close();
    }
}