org.asynchttpclient.resolver.RequestNameResolver.java Source code

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Here is the source code for org.asynchttpclient.resolver.RequestNameResolver.java

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/*
 * Copyright (c) 2015 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.resolver;

import static org.asynchttpclient.handler.AsyncHandlerExtensionsUtils.toAsyncHandlerExtensions;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.ImmediateEventExecutor;
import io.netty.util.concurrent.Promise;

import java.net.InetSocketAddress;
import java.util.Collections;
import java.util.List;

import org.asynchttpclient.AsyncHandler;
import org.asynchttpclient.Request;
import org.asynchttpclient.handler.AsyncHandlerExtensions;
import org.asynchttpclient.netty.SimpleGenericFutureListener;
import org.asynchttpclient.proxy.ProxyServer;
import org.asynchttpclient.uri.Uri;

public enum RequestNameResolver {

    INSTANCE;

    public Future<List<InetSocketAddress>> resolve(Request request, ProxyServer proxy,
            AsyncHandler<?> asyncHandler) {

        Uri uri = request.getUri();

        if (request.getAddress() != null) {
            List<InetSocketAddress> resolved = Collections
                    .singletonList(new InetSocketAddress(request.getAddress(), uri.getExplicitPort()));
            Promise<List<InetSocketAddress>> promise = ImmediateEventExecutor.INSTANCE.newPromise();
            return promise.setSuccess(resolved);

        }

        // don't notify on explicit address
        final AsyncHandlerExtensions asyncHandlerExtensions = request.getAddress() == null
                ? toAsyncHandlerExtensions(asyncHandler)
                : null;
        final String name;
        final int port;

        if (proxy != null && !proxy.isIgnoredForHost(uri.getHost())) {
            name = proxy.getHost();
            port = uri.isSecured() ? proxy.getSecuredPort() : proxy.getPort();
        } else {
            name = uri.getHost();
            port = uri.getExplicitPort();
        }

        if (asyncHandlerExtensions != null)
            asyncHandlerExtensions.onDnsResolution(name);

        final Future<List<InetSocketAddress>> whenResolved = request.getNameResolver().resolve(name, port);

        if (asyncHandlerExtensions == null)
            return whenResolved;

        Promise<List<InetSocketAddress>> promise = ImmediateEventExecutor.INSTANCE.newPromise();

        whenResolved.addListener(new SimpleGenericFutureListener<List<InetSocketAddress>>() {

            @Override
            protected void onSuccess(List<InetSocketAddress> addresses) throws Exception {
                asyncHandlerExtensions.onDnsResolutionSuccess(name, addresses);
                promise.setSuccess(addresses);
            }

            @Override
            protected void onFailure(Throwable t) throws Exception {
                asyncHandlerExtensions.onDnsResolutionFailure(name, t);
                promise.setFailure(t);
            }
        });

        return promise;
    }
}