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The Athena Query Federation SDK defines a set of interfaces and wire protocols that you can implement to enable Athena to delegate portions of it's query execution plan to code that you deploy/write.

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package com.amazonaws.athena.connector.lambda.metadata;

/*-
 * #%L
 * Amazon Athena Query Federation SDK
 * %%
 * Copyright (C) 2019 Amazon Web Services
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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.
 * #L%
 */

import com.amazonaws.services.lambda.invoke.LambdaFunction;

/**
 * Lambda functions intended for Metadata operations associate with this interface.
 */
public interface MetadataService
{
    /**
     * Returns metadata corresponding to the request type.
     *
     * @param request The metadata request.
     * @return The metadata.
     */
    @LambdaFunction(functionName = "metadata")
    MetadataResponse getMetadata(final MetadataRequest request);
}