software.amazon.awssdk.http.apache.internal.conn.ClientConnectionRequestFactory Maven / Gradle / Ivy

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A single bundled dependency that includes all service and dependent JARs with third-party libraries relocated to different namespaces.

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/*
 * Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 software.amazon.awssdk.http.apache.internal.conn;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import org.apache.http.conn.ConnectionRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.awssdk.annotations.SdkInternalApi;

@SdkInternalApi
final class ClientConnectionRequestFactory {
    private static final Logger log = LoggerFactory.getLogger(ClientConnectionRequestFactory.class);
    private static final Class[] INTERFACES = {
            ConnectionRequest.class,
            Wrapped.class
    };

    private ClientConnectionRequestFactory() {
    }

    /**
     * Returns a wrapped instance of {@link ConnectionRequest}
     * to capture the necessary performance metrics.
     *
     * @param orig the target instance to be wrapped
     */
    static ConnectionRequest wrap(ConnectionRequest orig) {
        if (orig instanceof Wrapped) {
            throw new IllegalArgumentException();
        }
        return (ConnectionRequest) Proxy.newProxyInstance(
                // https://github.com/aws/aws-sdk-java/pull/48#issuecomment-29454423
                ClientConnectionRequestFactory.class.getClassLoader(),
                INTERFACES,
                new Handler(orig));
    }

    /**
     * The handler behind the dynamic proxy for {@link ConnectionRequest}
     * so that the latency of the
     * {@link ConnectionRequest#get(long, java.util.concurrent.TimeUnit)}
     * can be captured.
     */
    private static class Handler implements InvocationHandler {
        private final ConnectionRequest orig;

        Handler(ConnectionRequest orig) {
            this.orig = orig;
        }

        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            try {
                // TODO v2 service metrics
                //                if ("get".equals(method.getName())) {
                //                    ServiceLatencyProvider latencyProvider = new ServiceLatencyProvider(
                //                            AWSServiceMetrics.HttpClientGetConnectionTime);
                //                    try {
                //                        return method.invoke(orig, args);
                //                    } finally {
                //                        AwsSdkMetrics.getServiceMetricCollector()
                //                                .collectLatency(latencyProvider.endTiming());
                //                    }
                //                }
                return method.invoke(orig, args);
            } catch (InvocationTargetException e) {
                log.debug("", e);
                throw e.getCause();
            }
        }
    }
}