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The AWS SDK for Java - Core 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 2011-2019 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 com.amazonaws.client;

import com.amazonaws.AmazonWebServiceRequest;
import com.amazonaws.annotation.SdkProtectedApi;

/**
 * Client interface to invoke an API.
 */
@SdkProtectedApi
public abstract class ClientHandler {

    /**
     * Execute's a web service request. Handles marshalling and unmarshalling of data and making the
     * underlying HTTP call(s).
     *
     * @param executionParams Parameters specific to this invocation of an API.
     * @param          Input POJO type
     * @param         Output POJO type
     * @return Unmarshalled output POJO type.
     */
    public abstract  Output execute(
            ClientExecutionParams executionParams);

    /**
     * Shutdown and release any underlying resources.
     */
    public abstract void shutdown();
}