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/*
* Copyright 2015-2016 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.
* You may obtain a copy of the License at:
*
* http://aws.amazon.com/apache2.0
*
* 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.services.dynamodbv2.datamodeling;
import java.util.List;
import java.util.Map;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.FailedBatch;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperConfig.PaginationLoadingStrategy;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperConfig.SaveBehavior;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.BatchGetItemRequest;
import com.amazonaws.services.dynamodbv2.model.BatchWriteItemRequest;
import com.amazonaws.services.dynamodbv2.model.CreateTableRequest;
import com.amazonaws.services.dynamodbv2.model.DeleteTableRequest;
import com.amazonaws.services.dynamodbv2.model.PutItemRequest;
import com.amazonaws.services.dynamodbv2.model.UpdateItemRequest;
import com.amazonaws.services.s3.model.Region;
/**
* Interface for DynamoDBMapper. See the standard implementation {@link DynamoDBMapper} for the
* usage.
*
* @see DynamoDBMapper
*/
public interface IDynamoDBMapper {
/**
* Loads an object with the hash key given and a configuration override. This configuration
* overrides the default provided at object construction.
*
* @see DynamoDBMapper#load(Class, Object, Object, DynamoDBMapperConfig)
*/
T load(Class clazz, Object hashKey, DynamoDBMapperConfig config);
/**
* Loads an object with the hash key given, using the default configuration.
*
* @see DynamoDBMapper#load(Class, Object, Object, DynamoDBMapperConfig)
*/
T load(Class clazz, Object hashKey);
/**
* Loads an object with a hash and range key, using the default configuration.
*
* @see DynamoDBMapper#load(Class, Object, Object, DynamoDBMapperConfig)
*/
T load(Class clazz, Object hashKey, Object rangeKey);
/**
* Returns an object whose keys match those of the prototype key object given, or null if no
* such item exists.
*
* @param keyObject
* An object of the class to load with the keys values to match.
* @see DynamoDBMapper#load(Object, DynamoDBMapperConfig)
*/
T load(T keyObject);
/**
* Returns an object whose keys match those of the prototype key object given, or null if no
* such item exists.
*
* @param keyObject
* An object of the class to load with the keys values to match.
* @param config
* Configuration for the service call to retrieve the object from DynamoDB. This
* configuration overrides the default given at construction.
*/
T load(T keyObject, DynamoDBMapperConfig config);
/**
* Returns an object with the given hash key, or null if no such object exists.
*
* @param clazz
* The class to load, corresponding to a DynamoDB table.
* @param hashKey
* The key of the object.
* @param rangeKey
* The range key of the object, or null for tables without a range key.
* @param config
* Configuration for the service call to retrieve the object from DynamoDB. This
* configuration overrides the default given at construction.
*/
T load(Class clazz, Object hashKey, Object rangeKey, DynamoDBMapperConfig config);
/**
* Creates and fills in the attributes on an instance of the class given with the attributes
* given.
*
* This is accomplished by looking for getter methods annotated with an appropriate annotation,
* then looking for matching attribute names in the item attribute map.
*
* This method is no longer called by load/scan/query methods. If you are overriding this
* method, please switch to using an AttributeTransformer
*
* @param clazz
* The class to instantiate and hydrate
* @param itemAttributes
* The set of item attributes, keyed by attribute name.
*/
T marshallIntoObject(Class clazz, Map itemAttributes);
/**
* Unmarshalls the list of item attributes into objects of type clazz.
*
* This method is no longer called by load/scan/query methods. If you are overriding this
* method, please switch to using an AttributeTransformer
*
* @see DynamoDBMapper#marshallIntoObject(Class, Map)
*/
List marshallIntoObjects(Class clazz, List> itemAttributes);
/**
* Saves the object given into DynamoDB, using the default configuration.
*
* @see DynamoDBMapper#save(Object, DynamoDBSaveExpression, DynamoDBMapperConfig)
*/
void save(T object);
/**
* Saves the object given into DynamoDB, using the default configuration and the specified
* saveExpression.
*
* @see DynamoDBMapper#save(Object, DynamoDBSaveExpression, DynamoDBMapperConfig)
*/
void save(T object, DynamoDBSaveExpression saveExpression);
/**
* Saves the object given into DynamoDB, using the specified configuration.
*
* @see DynamoDBMapper#save(Object, DynamoDBSaveExpression, DynamoDBMapperConfig)
*/
void save(T object, DynamoDBMapperConfig config);
/**
* Saves an item in DynamoDB. The service method used is determined by the
* {@link DynamoDBMapperConfig#getSaveBehavior()} value, to use either
* {@link AmazonDynamoDB#putItem(PutItemRequest)} or
* {@link AmazonDynamoDB#updateItem(UpdateItemRequest)}:
*
* - UPDATE (default) : UPDATE will not affect unmodeled attributes on a save operation
* and a null value for the modeled attribute will remove it from that item in DynamoDB. Because
* of the limitation of updateItem request, the implementation of UPDATE will send a putItem
* request when a key-only object is being saved, and it will send another updateItem request if
* the given key(s) already exists in the table.
* - UPDATE_SKIP_NULL_ATTRIBUTES : Similar to UPDATE except that it ignores any null
* value attribute(s) and will NOT remove them from that item in DynamoDB. It also guarantees to
* send only one single updateItem request, no matter the object is key-only or not.
* - CLOBBER : CLOBBER will clear and replace all attributes, included unmodeled ones,
* (delete and recreate) on save. Versioned field constraints will also be disregarded.
*
* Any options specified in the saveExpression parameter will be overlaid on any constraints due
* to versioned attributes.
*
* @param object
* The object to save into DynamoDB
* @param saveExpression
* The options to apply to this save request
* @param config
* The configuration to use, which overrides the default provided at object
* construction.
* @see DynamoDBMapperConfig.SaveBehavior
*/
void save(T object, DynamoDBSaveExpression saveExpression, DynamoDBMapperConfig config);
/**
* Deletes the given object from its DynamoDB table using the default configuration.
*/
void delete(Object object);
/**
* Deletes the given object from its DynamoDB table using the specified deleteExpression and
* default configuration.
*/
void delete(Object object, DynamoDBDeleteExpression deleteExpression);
/**
* Deletes the given object from its DynamoDB table using the specified configuration.
*/
void delete(Object object, DynamoDBMapperConfig config);
/**
* Deletes the given object from its DynamoDB table using the provided deleteExpression and
* provided configuration. Any options specified in the deleteExpression parameter will be
* overlaid on any constraints due to versioned attributes.
*
* @param deleteExpression
* The options to apply to this delete request
* @param config
* Config override object. If {@link SaveBehavior#CLOBBER} is supplied, version
* fields will not be considered when deleting the object.
*/
void delete(T object, DynamoDBDeleteExpression deleteExpression, DynamoDBMapperConfig config);
/**
* Deletes the objects given using one or more calls to the
* {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API. No version checks are
* performed, as required by the API.
*
* @see DynamoDBMapper#batchWrite(Iterable, Iterable)
*/
List batchDelete(Iterable objectsToDelete);
/**
* Deletes the objects given using one or more calls to the
* {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API. No version checks are
* performed, as required by the API.
*
* @see DynamoDBMapper#batchWrite(Iterable, Iterable)
*/
List batchDelete(Object... objectsToDelete);
/**
* Saves the objects given using one or more calls to the
* {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API. No version checks are
* performed, as required by the API.
*
* This method ignores any SaveBehavior set on the mapper, and always behaves as if
* SaveBehavior.CLOBBER was specified, as the AmazonDynamoDB.batchWriteItem() request does not
* support updating existing items.
*
* This method fails to save the batch if the size of an individual object in the batch exceeds
* 400 KB. For more information on batch restrictions see, http://docs.aws.amazon
* .com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html
*
*
* @see DynamoDBMapper#batchWrite(Iterable, Iterable)
*/
List batchSave(Iterable objectsToSave);
/**
* Saves the objects given using one or more calls to the
* {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API. No version checks are
* performed, as required by the API.
*
* This method ignores any SaveBehavior set on the mapper, and always behaves as if
* SaveBehavior.CLOBBER was specified, as the AmazonDynamoDB.batchWriteItem() request does not
* support updating existing items. *
*
* This method fails to save the batch if the size of an individual object in the batch exceeds
* 400 KB. For more information on batch restrictions see, http://docs.aws.amazon
* .com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html
*
*
* @see DynamoDBMapper#batchWrite(Iterable, Iterable)
*/
List batchSave(Object... objectsToSave);
/**
* Saves and deletes the objects given using one or more calls to the
* {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API. No version checks are
* performed, as required by the API.
*
* This method ignores any SaveBehavior set on the mapper, and always behaves as if
* SaveBehavior.CLOBBER was specified, as the AmazonDynamoDB.batchWriteItem() request does not
* support updating existing items.
*
* This method fails to save the batch if the size of an individual object in the batch exceeds
* 400 KB. For more information on batch restrictions see, http://docs.aws.amazon
* .com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html
*
*
* If one of the write requests is for a table that is not present, this method does not throw a
* ResourceNotFoundException but returns a FailedBatch which includes this exception and the
* unprocessed items.
*
*
* @see DynamoDBMapper#batchWrite(Iterable, Iterable)
*/
List batchWrite(Iterable objectsToWrite, Iterable objectsToDelete);
/**
* Saves and deletes the objects given using one or more calls to the
* {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API. Use mapper config to
* control the retry strategy when UnprocessedItems are returned by the BatchWriteItem API
*
* This method fails to save the batch if the size of an individual object in the batch exceeds
* 400 KB. For more information on batch restrictions see, http://docs.aws.amazon
* .com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html
*
*
* If one of the write requests is for a table that is not present, this method does not throw a
* ResourceNotFoundException but returns a FailedBatch which includes this exception and the
* unprocessed items.
*
*
* @param objectsToWrite
* A list of objects to save to DynamoDB. No version checks are performed, as
* required by the {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} API.
* @param objectsToDelete
* A list of objects to delete from DynamoDB. No version checks are performed,
* as required by the {@link AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)}
* API.
* @param config
* Only {@link DynamoDBMapperConfig#getTableNameOverride()} and
* {@link DynamoDBMapperConfig#getBatchWriteRetryStrategy()} are considered. If
* TableNameOverride is specified, all objects in the two parameter lists will be
* considered to belong to the given table override. In particular, this method
* always acts as if SaveBehavior.CLOBBER was specified regardless of the
* value of the config parameter.
* @return A list of failed batches which includes the unprocessed items and the exceptions
* causing the failure.
* @see DynamoDBMapperConfig#getTableNameOverride()
* @see DynamoDBMapperConfig#getBatchWriteRetryStrategy()
*/
List batchWrite(Iterable objectsToWrite,
Iterable objectsToDelete,
DynamoDBMapperConfig config);
/**
* Retrieves multiple items from multiple tables using their primary keys.
*
* @see DynamoDBMapper#batchLoad(List, DynamoDBMapperConfig)
* @return A map of the loaded objects. Each key in the map is the name of a DynamoDB table.
* Each value in the map is a list of objects that have been loaded from that table. All
* objects for each table can be cast to the associated user defined type that is
* annotated as mapping that table.
*/
Map> batchLoad(Iterable itemsToGet);
/**
* Retrieves multiple items from multiple tables using their primary keys.
*
* @param itemsToGet
* Key objects, corresponding to the class to fetch, with their primary key values
* set.
* @param config
* Only {@link DynamoDBMapperConfig#getTableNameOverride()} and
* {@link DynamoDBMapperConfig#getConsistentReads()} are considered.
* @return A map of the loaded objects. Each key in the map is the name of a DynamoDB table.
* Each value in the map is a list of objects that have been loaded from that table. All
* objects for each table can be cast to the associated user defined type that is
* annotated as mapping that table.
*/
Map> batchLoad(Iterable itemsToGet, DynamoDBMapperConfig config);
/**
* Retrieves the attributes for multiple items from multiple tables using their primary keys.
* {@link AmazonDynamoDB#batchGetItem(BatchGetItemRequest)} API.
*
* @return A map of the loaded objects. Each key in the map is the name of a DynamoDB table.
* Each value in the map is a list of objects that have been loaded from that table. All
* objects for each table can be cast to the associated user defined type that is
* annotated as mapping that table.
* @see #batchLoad(List, DynamoDBMapperConfig)
* @see #batchLoad(Map, DynamoDBMapperConfig)
*/
Map> batchLoad(Map, List> itemsToGet);
/**
* Retrieves multiple items from multiple tables using their primary keys. Valid only for tables
* with a single hash key, or a single hash and range key. For other schemas, use
* {@link DynamoDBMapper#batchLoad(List, DynamoDBMapperConfig)}
*
* @param itemsToGet
* Map from class to load to list of primary key attributes.
* @param config
* Only {@link DynamoDBMapperConfig#getTableNameOverride()} and
* {@link DynamoDBMapperConfig#getConsistentReads()} are considered.
* @return A map of the loaded objects. Each key in the map is the name of a DynamoDB table.
* Each value in the map is a list of objects that have been loaded from that table. All
* objects for each table can be cast to the associated user defined type that is
* annotated as mapping that table.
*/
Map> batchLoad(Map, List> itemsToGet, DynamoDBMapperConfig config);
/**
* Scans through an Amazon DynamoDB table and returns the matching results as an unmodifiable
* list of instantiated objects, using the default configuration.
*
* @see DynamoDBMapper#scan(Class, DynamoDBScanExpression, DynamoDBMapperConfig)
*/
PaginatedScanList scan(Class clazz, DynamoDBScanExpression scanExpression);
/**
* Scans through an Amazon DynamoDB table and returns the matching results as an unmodifiable
* list of instantiated objects. The table to scan is determined by looking at the annotations
* on the specified class, which declares where to store the object data in Amazon DynamoDB, and
* the scan expression parameter allows the caller to filter results and control how the scan is
* executed.
*
* Callers should be aware that the returned list is unmodifiable, and any attempts to modify
* the list will result in an UnsupportedOperationException.
*
* You can specify the pagination loading strategy for this scan operation. By default, the list
* returned is lazily loaded when possible.
*
* @param
* The type of the objects being returned.
* @param clazz
* The class annotated with DynamoDB annotations describing how to store the object
* data in Amazon DynamoDB.
* @param scanExpression
* Details on how to run the scan, including any filters to apply to limit results.
* @param config
* The configuration to use for this scan, which overrides the default provided at
* object construction.
* @return An unmodifiable list of the objects constructed from the results of the scan
* operation.
* @see PaginatedScanList
* @see PaginationLoadingStrategy
*/
PaginatedScanList scan(Class clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config);
/**
* Scans through an Amazon DynamoDB table on logically partitioned segments in parallel and
* returns the matching results in one unmodifiable list of instantiated objects, using the
* default configuration.
*
* @see DynamoDBMapper#parallelScan(Class, DynamoDBScanExpression,int, DynamoDBMapperConfig)
*/
PaginatedParallelScanList parallelScan(Class clazz,
DynamoDBScanExpression scanExpression,
int totalSegments);
/**
* Scans through an Amazon DynamoDB table on logically partitioned segments in parallel. This
* method will create a thread pool of the specified size, and each thread will issue scan
* requests for its assigned segment, following the returned continuation token, until the end
* of its segment. Callers should be responsible for setting the appropriate number of total
* segments. More scan segments would result in better performance but more consumed capacity of
* the table. The results are returned in one unmodifiable list of instantiated objects. The
* table to scan is determined by looking at the annotations on the specified class, which
* declares where to store the object data in Amazon DynamoDB, and the scan expression parameter
* allows the caller to filter results and control how the scan is executed.
*
* Callers should be aware that the returned list is unmodifiable, and any attempts to modify
* the list will result in an UnsupportedOperationException.
*
* You can specify the pagination loading strategy for this parallel scan operation. By default,
* the list returned is lazily loaded when possible.
*
* @param
* The type of the objects being returned.
* @param clazz
* The class annotated with DynamoDB annotations describing how to store the object
* data in Amazon DynamoDB.
* @param scanExpression
* Details on how to run the scan, including any filters to apply to limit results.
* @param totalSegments
* Number of total parallel scan segments. Range: 1 - 4096
* @param config
* The configuration to use for this scan, which overrides the default provided at
* object construction.
* @return An unmodifiable list of the objects constructed from the results of the scan
* operation.
* @see PaginatedParallelScanList
* @see PaginationLoadingStrategy
*/
PaginatedParallelScanList parallelScan(Class clazz,
DynamoDBScanExpression scanExpression,
int totalSegments,
DynamoDBMapperConfig config);
/**
* Scans through an Amazon DynamoDB table and returns a single page of matching results. The
* table to scan is determined by looking at the annotations on the specified class, which
* declares where to store the object data in AWS DynamoDB, and the scan expression parameter
* allows the caller to filter results and control how the scan is executed.
*
* @param
* The type of the objects being returned.
* @param clazz
* The class annotated with DynamoDB annotations describing how to store the object
* data in Amazon DynamoDB.
* @param scanExpression
* Details on how to run the scan, including any filters to apply to limit results.
* @param config
* The configuration to use for this scan, which overrides the default provided at
* object construction.
*/
ScanResultPage scanPage(Class clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config);
/**
* Scans through an Amazon DynamoDB table and returns a single page of matching results.
*
* @see DynamoDBMapper#scanPage(Class, DynamoDBScanExpression, DynamoDBMapperConfig)
*/
ScanResultPage scanPage(Class clazz, DynamoDBScanExpression scanExpression);
/**
* Queries an Amazon DynamoDB table and returns the matching results as an unmodifiable list of
* instantiated objects, using the default configuration.
*
* @see DynamoDBMapper#query(Class, DynamoDBQueryExpression, DynamoDBMapperConfig)
*/
PaginatedQueryList query(Class clazz, DynamoDBQueryExpression queryExpression);
/**
* Queries an Amazon DynamoDB table and returns the matching results as an unmodifiable list of
* instantiated objects. The table to query is determined by looking at the annotations on the
* specified class, which declares where to store the object data in Amazon DynamoDB, and the
* query expression parameter allows the caller to filter results and control how the query is
* executed.
*
* When the query is on any local/global secondary index, callers should be aware that the
* returned object(s) will only contain item attributes that are projected into the index. All
* the other unprojected attributes will be saved as type default values.
*
* Callers should also be aware that the returned list is unmodifiable, and any attempts to
* modify the list will result in an UnsupportedOperationException.
*
* You can specify the pagination loading strategy for this query operation. By default, the
* list returned is lazily loaded when possible.
*
* @param
* The type of the objects being returned.
* @param clazz
* The class annotated with DynamoDB annotations describing how to store the object
* data in Amazon DynamoDB.
* @param queryExpression
* Details on how to run the query, including any conditions on the key values
* @param config
* The configuration to use for this query, which overrides the default provided at
* object construction.
* @return An unmodifiable list of the objects constructed from the results of the query
* operation.
* @see PaginatedQueryList
* @see PaginationLoadingStrategy
*/
PaginatedQueryList query(Class clazz,
DynamoDBQueryExpression queryExpression,
DynamoDBMapperConfig config);
/**
* Queries an Amazon DynamoDB table and returns a single page of matching results. The table to
* query is determined by looking at the annotations on the specified class, which declares
* where to store the object data in Amazon DynamoDB, and the query expression parameter allows
* the caller to filter results and control how the query is executed.
*
* @see DynamoDBMapper#queryPage(Class, DynamoDBQueryExpression, DynamoDBMapperConfig)
*/
QueryResultPage queryPage(Class clazz, DynamoDBQueryExpression queryExpression);
/**
* Queries an Amazon DynamoDB table and returns a single page of matching results. The table to
* query is determined by looking at the annotations on the specified class, which declares
* where to store the object data in Amazon DynamoDB, and the query expression parameter allows
* the caller to filter results and control how the query is executed.
*
* @param
* The type of the objects being returned.
* @param clazz
* The class annotated with DynamoDB annotations describing how to store the object
* data in AWS DynamoDB.
* @param queryExpression
* Details on how to run the query, including any conditions on the key values
* @param config
* The configuration to use for this query, which overrides the default provided at
* object construction.
*/
QueryResultPage queryPage(Class clazz,
DynamoDBQueryExpression queryExpression,
DynamoDBMapperConfig config);
/**
* Evaluates the specified scan expression and returns the count of matching items, without
* returning any of the actual item data, using the default configuration.
*
* @see DynamoDBMapper#count(Class, DynamoDBScanExpression, DynamoDBMapperConfig)
*/
int count(Class clazz, DynamoDBScanExpression scanExpression);
/**
* Evaluates the specified scan expression and returns the count of matching items, without
* returning any of the actual item data.
*
* This operation will scan your entire table, and can therefore be very expensive. Use with
* caution.
*
* @param clazz
* The class mapped to a DynamoDB table.
* @param scanExpression
* The parameters for running the scan.
* @param config
* The configuration to use for this scan, which overrides the default provided at
* object construction.
* @return The count of matching items, without returning any of the actual item data.
*/
int count(Class clazz, DynamoDBScanExpression scanExpression, DynamoDBMapperConfig config);
/**
* Evaluates the specified query expression and returns the count of matching items, without
* returning any of the actual item data, using the default configuration.
*
* @see DynamoDBMapper#count(Class, DynamoDBQueryExpression, DynamoDBMapperConfig)
*/
int count(Class clazz, DynamoDBQueryExpression queryExpression);
/**
* Evaluates the specified query expression and returns the count of matching items, without
* returning any of the actual item data.
*
* @param clazz
* The class mapped to a DynamoDB table.
* @param queryExpression
* The parameters for running the scan.
* @param config
* The mapper configuration to use for the query, which overrides the default
* provided at object construction.
* @return The count of matching items, without returning any of the actual item data.
*/
int count(Class clazz, DynamoDBQueryExpression queryExpression, DynamoDBMapperConfig config);
/**
* Returns the underlying {@link S3ClientCache} for accessing S3.
*/
S3ClientCache getS3ClientCache();
/**
* Creates an S3Link with the specified bucket name and key using the default S3 region. This
* method requires the mapper to have been initialized with the necessary credentials for
* accessing S3.
*
* @throws IllegalStateException
* if the mapper has not been constructed with the necessary S3 AWS credentials.
*/
S3Link createS3Link(String bucketName, String key);
/**
* Creates an S3Link with the specified region, bucket name and key. This method requires the
* mapper to have been initialized with the necessary credentials for accessing S3.
*
* @throws IllegalStateException
* if the mapper has not been constructed with the necessary S3 AWS credentials.
*/
S3Link createS3Link(Region s3region, String bucketName, String key);
/**
* Parse the given POJO class and return the CreateTableRequest for the DynamoDB table it
* represents. Note that the returned request does not include the required
* ProvisionedThroughput parameters for the primary table and the GSIs, and that all secondary
* indexes are initialized with the default projection type - KEY_ONLY.
*/
CreateTableRequest generateCreateTableRequest(Class clazz);
/**
* Parse the given POJO class and return the DeleteTableRequest for the DynamoDB table it
* represents.
*/
DeleteTableRequest generateDeleteTableRequest(Class clazz);
}