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The AWS SDK for Java - SDK Core runtime module holds the classes that are used by the individual service clients to interact with Amazon Web Services. Users need to depend on aws-java-sdk artifact for accessing individual client classes.

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/*
 * Copyright 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.core;

import java.util.Optional;
import software.amazon.awssdk.annotations.Immutable;
import software.amazon.awssdk.annotations.SdkPublicApi;

/**
 * The base class for all SDK requests.
 * 
 *     Implementations must ensure the class is immutable.
 * 
 * @see SdkResponse
 */
@Immutable
@SdkPublicApi
public abstract class SdkRequest implements SdkPojo {
    /**
    * @return The optional client configuration overrides for this request.
    */
    public abstract Optional overrideConfiguration();

    /**
    * Used to retrieve the value of a field from any class that extends {@link SdkRequest}. The field name
    * specified should match the member name from the corresponding service-2.json model specified in the
    * codegen-resources folder for a given service. The class specifies what class to cast the returned value to.
    * If the returned value is also a modeled class, the {@link #getValueForField(String, Class)} method will
    * again be available.
    *
    * @param fieldName The name of the member to be retrieved.
    * @param clazz The class to cast the returned object to.
    * @return Optional containing the casted return value
    */
    public  Optional getValueForField(String fieldName, Class clazz) {
        return Optional.empty();
    }

    public abstract Builder toBuilder();

    public interface Builder {
        RequestOverrideConfiguration overrideConfiguration();

        SdkRequest build();
    }
}