/*
 * 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.
 */

using System;
using System.Collections.Generic;
using System.Linq;

using Amazon.DynamoDBv2.Model;
using Amazon.Runtime;

namespace Amazon.DynamoDBv2.DocumentModel
{
    /// <summary>
    /// Class for retrieving a batch of Documents from a single DynamoDB table.
    /// </summary>
    public partial class DocumentBatchGet
    {
        #region Public methods

        /// <summary>
        /// Executes a server call to batch-get the documents requested.
        /// Populates Results with the retrieved items.
        /// </summary>
        /// <param name="callback">An AsyncCallback delegate that is invoked when the operation completes.</param>
        /// <param name="state">A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback
        ///          procedure using the AsyncState property.</param>
        /// <returns>An IAsyncResult that can be used to poll or wait for results, or both; this value is also needed when invoking EndExecute
        ///         operation.</returns>
        public IAsyncResult BeginExecute(AsyncCallback callback, object state)
        {
            return DynamoDBAsyncExecutor.BeginOperation(() => { ExecuteHelper(); return null; }, callback, state);
        }

        /// <summary>
        /// Finishes the asynchronous execution of the Execute operation.
        /// <seealso cref="Amazon.DynamoDBv2.DocumentModel.DocumentBatchGet.Execute"/>
        /// </summary>
        /// <param name="asyncResult">The IAsyncResult returned by the call to BeginExecute.</param>
        public void EndExecute(IAsyncResult asyncResult)
        {
            DynamoDBAsyncExecutor.EndOperation(asyncResult);
        }

        #endregion

    }

    /// <summary>
    /// Class for retrieving a batch of Documents from multiple DynamoDB tables.
    /// </summary>
    public partial class MultiTableDocumentBatchGet
    {
        #region Public methods

        /// <summary>
        /// Executes a multi-table batch request against all configured batches.
        /// Results are stored in the respective DocumentBatchGet objects.
        /// </summary>
        /// <param name="callback">An AsyncCallback delegate that is invoked when the operation completes.</param>
        /// <param name="state">A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback
        ///          procedure using the AsyncState property.</param>
        /// <returns>An IAsyncResult that can be used to poll or wait for results, or both; this value is also needed when invoking EndExecute
        ///         operation.</returns>
        public IAsyncResult BeginExecute(AsyncCallback callback, object state)
        {
            return DynamoDBAsyncExecutor.BeginOperation(() => { ExecuteHelper(); return null; }, callback, state);
        }

        /// <summary>
        /// Finishes the asynchronous execution of the Execute operation.
        /// <seealso cref="Amazon.DynamoDBv2.DocumentModel.MultiTableDocumentBatchGet.Execute"/>
        /// </summary>
        /// <param name="asyncResult">The IAsyncResult returned by the call to BeginExecute.</param>
        public void EndExecute(IAsyncResult asyncResult)
        {
            DynamoDBAsyncExecutor.EndOperation(asyncResult);
        }

        #endregion
    }

}