Package software.amazon.awssdk.enhanced.dynamodb.internal.operations

Interface CommonOperation<ItemT,​RequestT,​ResponseT,​ResultT>

  • Type Parameters:
    ItemT - The modelled object that this table maps records to.
    RequestT - The type of the request object for the DynamoDb call in the low level DynamoDbClient or DynamoDbAsyncClient.
    ResponseT - The type of the response object for the DynamoDb call in the low level DynamoDbClient or DynamoDbAsyncClient.
    ResultT - The type of the mapped result object that will be returned by the execution of this operation.
    All Known Subinterfaces:
    IndexOperation<ItemT,​RequestT,​ResponseT,​ResultT>, TableOperation<ItemT,​RequestT,​ResponseT,​ResultT>
    All Known Implementing Classes:
    CreateTableOperation, DeleteItemOperation, DeleteTableOperation, DescribeTableOperation, GetItemOperation, PutItemOperation, UpdateItemOperation
    public interface CommonOperation<ItemT,​RequestT,​ResponseT,​ResultT>
    Common interface for a single operation that can be executed in a synchronous or non-blocking asynchronous fashion against a mapped database table. These operations can be made against either the primary index of a table or a secondary index, although some implementations of this interface do not support secondary indices and will throw an exception when executed against one. Conceptually an operation maps 1:1 with an actual DynamoDb call.

    This interface is extended by TableOperation and IndexOperation which contain implementations of the behavior to actually execute the operation in the context of a table or secondary index and are used by DynamoDbTable or DynamoDbAsyncTable and DynamoDbIndex or DynamoDbAsyncIndex respectively. By sharing this common interface operations are able to re-use code regardless of whether they are executed in the context of a primary or secondary index or whether they are being executed in a synchronous or non-blocking asynchronous fashion.

    • Method Detail

      • serviceCall

        Function<RequestT,​ResponseT> serviceCall​(DynamoDbClient dynamoDbClient)
        Provides a function for making the low level synchronous SDK call to DynamoDb.
        Parameters:
        dynamoDbClient - A low level DynamoDbClient to make the call against.
        Returns:
        A function that calls DynamoDb with a provided request object and returns the response object.

      • asyncServiceCall

        Function<RequestT,​CompletableFuture<ResponseT>> asyncServiceCall​(DynamoDbAsyncClient dynamoDbAsyncClient)
        Provides a function for making the low level non-blocking asynchronous SDK call to DynamoDb.
        Parameters:
        dynamoDbAsyncClient - A low level DynamoDbAsyncClient to make the call against.
        Returns:
        A function that calls DynamoDb with a provided request object and returns the response object.

      • transformResponse

        ResultT transformResponse​(ResponseT response,
                          TableSchema<ItemT> tableSchema,
                          OperationContext context,
                          DynamoDbEnhancedClientExtension extension)
        Takes the response object returned by the actual DynamoDb call and maps it into a higher level abstracted result object.
        Parameters:
        response - The response object returned by the DynamoDb call for this operation.
        tableSchema - A TableSchema that maps the table to a modelled object.
        context - An object containing the context, or target, of the command execution.
        extension - A DynamoDbEnhancedClientExtension that may modify the result of this operation. A null value here will result in no modifications.
        Returns:
        A high level result object as specified by the implementation of this operation.

      • execute

        default ResultT execute​(TableSchema<ItemT> tableSchema,
                        OperationContext context,
                        DynamoDbEnhancedClientExtension extension,
                        DynamoDbClient dynamoDbClient)
        Default implementation of a complete synchronous execution of this operation against either the primary or a secondary index. It performs three steps: 1) Call generateRequest() to get the request object. 2) Call getServiceCall() and call it using the request object generated in the previous step. 3) Call transformResponse() to convert the response object returned in the previous step to a high level result.
        Parameters:
        tableSchema - A TableSchema that maps the table to a modelled object.
        context - An object containing the context, or target, of the command execution.
        dynamoDbClient - A DynamoDbClient to make the call against.
        extension - A DynamoDbEnhancedClientExtension that may modify the request or result of this operation. A null value here will result in no modifications.
        Returns:
        A high level result object as specified by the implementation of this operation.

      • executeAsync

        default CompletableFuture<ResultT> executeAsync​(TableSchema<ItemT> tableSchema,
                                                OperationContext context,
                                                DynamoDbEnhancedClientExtension extension,
                                                DynamoDbAsyncClient dynamoDbAsyncClient)
        Default implementation of a complete non-blocking asynchronous execution of this operation against either the primary or a secondary index. It performs three steps: 1) Call generateRequest() to get the request object. 2) Call getServiceCall() and call it using the request object generated in the previous step. 3) Wraps the CompletableFuture returned by the SDK in a new one that calls transformResponse() to convert the response object returned in the previous step to a high level result.
        Parameters:
        tableSchema - A TableSchema that maps the table to a modelled object.
        context - An object containing the context, or target, of the command execution.
        dynamoDbAsyncClient - A DynamoDbAsyncClient to make the call against.
        extension - A DynamoDbEnhancedClientExtension that may modify the request or result of this operation. A null value here will result in no modifications.
        Returns:
        A CompletableFuture of the high level result object as specified by the implementation of this operation.

      • operationName

        OperationName operationName()
        The type, or name, of the operation.