internal Document GetItemHelper(Key key, GetItemOperationConfig config, bool isAsync)
{
var currentConfig = config ?? new GetItemOperationConfig();
var request = new GetItemRequest
{
TableName = TableName,
Key = key,
ConsistentRead = currentConfig.ConsistentRead
};
request.BeforeRequestEvent += isAsync ?
new RequestEventHandler(UserAgentRequestEventHandlerAsync) :
new RequestEventHandler(UserAgentRequestEventHandlerSync);
if (currentConfig.AttributesToGet != null)
request.WithAttributesToGet(currentConfig.AttributesToGet);
var result = DDBClient.GetItem(request);
var attributeMap = result.GetItemResult.Item;
if (attributeMap == null)
return null;
return Document.FromAttributeMap(attributeMap);
}
/// <summary>
/// Initiates the asynchronous execution of the GetItem operation.
/// <seealso cref="Amazon.DynamoDB.DocumentModel.Table.GetItem"/>
/// </summary>
/// <param name="hashKey">Hash key element of the document.</param>
/// <param name="rangeKey">Range key element of the document.</param>
/// <param name="config">Configuration to use.</param>
/// <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 EndGetItem
/// operation.</returns>
public IAsyncResult BeginGetItem(Primitive hashKey, Primitive rangeKey, GetItemOperationConfig config, AsyncCallback callback, object state)
{
return DynamoDBAsyncExecutor.BeginOperation(() => GetItemHelper(MakeKey(hashKey, rangeKey), config, true), callback, state);
}
/// <summary>
/// Gets a document from DynamoDB by hash-and-range primary key,
/// using specified configs.
/// </summary>
/// <param name="hashKey">Hash key element of the document.</param>
/// <param name="rangeKey">Range key element of the document.</param>
/// <param name="config">Configuration to use.</param>
/// <returns>Document from DynamoDB.</returns>
public Document GetItem(Primitive hashKey, Primitive rangeKey, GetItemOperationConfig config)
{
return GetItemHelper(MakeKey(hashKey, rangeKey), config, false);
}
/// <summary>
/// Gets a document from DynamoDB by hash primary key, using specified configs.
/// </summary>
/// <param name="hashKey">Hash key element of the document.</param>
/// <param name="config">Configuration to use.</param>
/// <returns>Document from DynamoDB.</returns>
public Document GetItem(Primitive hashKey, GetItemOperationConfig config)
{
return GetHelper(MakeKey(hashKey, null), config);
}