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The AWS Java SDK for Amazon DynamoDB module holds the client classes that are used for communicating with Amazon DynamoDB Service
/*
* Copyright 2010-2020 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.
*/
package com.amazonaws.services.dynamodbv2.datamodeling;
import java.util.ArrayList;
import java.util.List;
import com.amazonaws.annotation.NotThreadSafe;
import com.amazonaws.services.dynamodbv2.model.ReturnValuesOnConditionCheckFailure;
/**
* Represents objects to write using {@link DynamoDBMapper#transactionWrite(TransactionWriteRequest)} operation.
*/
@NotThreadSafe
public class TransactionWriteRequest {
/**
* List of TransactionWriteOperations where each TransactionWriteOperation represents a write operation to be executed on an object as part of
* this transactional write request.
*/
private final List transactionWriteOperations;
/**
* Token used to support idempotency on server side. For more information, please refer:
* https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_TransactWriteItems.html
*/
private String idempotencyToken;
public TransactionWriteRequest() {
transactionWriteOperations = new ArrayList();
}
/**
* Adds put operation (to be executed on object) to the list of transaction write operations.
* If the corresponding item exists, it will be overwritten.
*/
public TransactionWriteRequest addPut(Object object) {
return addPut(object, null /* transactionWriteExpression */);
}
/**
* Adds put operation (to be executed on object) to the list of transaction write operations.
* transactionWriteExpression is used to conditionally put object.
*/
public TransactionWriteRequest addPut(Object object, DynamoDBTransactionWriteExpression transactionWriteExpression) {
return addPut(object, transactionWriteExpression, null /* returnValuesOnConditionCheckFailure */);
}
/**
* Adds put operation (to be executed on object) to the list of transaction write operations.
* transactionWriteExpression is used to conditionally put object.
* returnValuesOnConditionCheckFailure specifies which attributes values (of existing item) should be returned if condition check fails.
*/
public TransactionWriteRequest addPut(Object object,
DynamoDBTransactionWriteExpression transactionWriteExpression,
ReturnValuesOnConditionCheckFailure returnValuesOnConditionCheckFailure) {
transactionWriteOperations.add(new TransactionWriteOperation(object, TransactionWriteOperationType.Put, transactionWriteExpression, returnValuesOnConditionCheckFailure));
return this;
}
/**
* Adds update operation (to be executed on object) to the list of transaction write operations.
*/
public TransactionWriteRequest addUpdate(Object object) {
return addUpdate(object, null /* transactionWriteExpression */);
}
/**
* Adds update operation (to be executed on object) to the list of transaction write operations.
* transactionWriteExpression is used to conditionally update object.
*/
public TransactionWriteRequest addUpdate(Object object, DynamoDBTransactionWriteExpression transactionWriteExpression) {
return addUpdate(object, transactionWriteExpression, null /* returnValuesOnConditionCheckFailure */);
}
/**
* Adds update operation (to be executed on object) to the list of transaction write operations.
* transactionWriteExpression is used to conditionally update object.
* returnValuesOnConditionCheckFailure specifies which attributes values (of existing item) should be returned if condition check fails.
*/
public TransactionWriteRequest addUpdate(Object object,
DynamoDBTransactionWriteExpression transactionWriteExpression,
ReturnValuesOnConditionCheckFailure returnValuesOnConditionCheckFailure) {
transactionWriteOperations.add(new TransactionWriteOperation(object, TransactionWriteOperationType.Update, transactionWriteExpression, returnValuesOnConditionCheckFailure));
return this;
}
/**
* Adds delete operation (to be executed on the object represented by key) to the list of transaction write operations.
*/
public TransactionWriteRequest addDelete(Object key) {
return addDelete(key, null /* transactionWriteExpression */);
}
/**
* Adds delete operation (to be executed on the object represented by key) to the list of transaction write operations.
* transactionWriteExpression is used to conditionally delete the object represented by key.
*/
public TransactionWriteRequest addDelete(Object key, DynamoDBTransactionWriteExpression transactionWriteExpression) {
return addDelete(key, transactionWriteExpression, null /* returnValuesOnConditionCheckFailure */);
}
/**
* Adds delete operation (to be executed on the object represented by key) to the list of transaction write operations.
* transactionWriteExpression is used to conditionally delete the object represented by key.
* returnValuesOnConditionCheckFailure specifies which attributes values (of existing item) should be returned if condition check fails.
*/
public TransactionWriteRequest addDelete(Object key,
DynamoDBTransactionWriteExpression transactionWriteExpression,
ReturnValuesOnConditionCheckFailure returnValuesOnConditionCheckFailure ) {
transactionWriteOperations.add(new TransactionWriteOperation(key, TransactionWriteOperationType.Delete, transactionWriteExpression, returnValuesOnConditionCheckFailure));
return this;
}
/**
* Adds conditionCheck operation (to be executed on the object represented by key) to the list of transaction write operations.
* transactionWriteExpression is used to condition check on the object represented by key.
*/
public TransactionWriteRequest addConditionCheck(Object key, DynamoDBTransactionWriteExpression transactionWriteExpression) {
return addConditionCheck(key, transactionWriteExpression, null /* returnValuesOnConditionCheckFailure */);
}
/**
* Adds conditionCheck operation (to be executed on the object represented by key) to the list of transaction write operations.
* transactionWriteExpression is used to condition check on the object represented by key.
* returnValuesOnConditionCheckFailure specifies which attributes values (of existing item) should be returned if condition check fails.
*/
public TransactionWriteRequest addConditionCheck(Object key,
DynamoDBTransactionWriteExpression transactionWriteExpression,
ReturnValuesOnConditionCheckFailure returnValuesOnConditionCheckFailure) {
transactionWriteOperations.add(new TransactionWriteOperation(key, TransactionWriteOperationType.ConditionCheck, transactionWriteExpression, returnValuesOnConditionCheckFailure));
return this;
}
/**
* Token used to support idempotency on server side. For more information, please refer:
* https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_TransactWriteItems.html
*/
public TransactionWriteRequest withIdempotencyToken(String idempotencyToken) {
this.idempotencyToken = idempotencyToken;
return this;
}
/**
* List of TransactionWriteOperations to be executed as part of this transactional write request.
*/
public List getTransactionWriteOperations() {
return transactionWriteOperations;
}
/**
* Token used to support idempotency on server side.
*/
public String getIdempotencyToken() {
return idempotencyToken;
}
/**
* Represents a write operation to be executed on an object as part of a transactional write request.
*/
public static class TransactionWriteOperation {
private Object object;
private TransactionWriteOperationType transactionWriteOperationType;
private DynamoDBTransactionWriteExpression dynamoDBTransactionWriteExpression;
private ReturnValuesOnConditionCheckFailure returnValuesOnConditionCheckFailure;
public TransactionWriteOperation(Object object,
TransactionWriteOperationType transactionWriteOperationType,
DynamoDBTransactionWriteExpression dynamoDBTransactionWriteExpression,
ReturnValuesOnConditionCheckFailure returnValuesOnConditionCheckFailure) {
this.object = object;
this.transactionWriteOperationType = transactionWriteOperationType;
this.dynamoDBTransactionWriteExpression = dynamoDBTransactionWriteExpression;
this.returnValuesOnConditionCheckFailure = returnValuesOnConditionCheckFailure;
}
/**
* Object on which this operation would be executed.
*/
public Object getObject() {
return object;
}
/**
* Type of this operation.
*/
public TransactionWriteOperationType getTransactionWriteOperationType() {
return transactionWriteOperationType;
}
/**
* Write expression for conditionally executing this operation.
*/
public DynamoDBTransactionWriteExpression getDynamoDBTransactionWriteExpression() {
return dynamoDBTransactionWriteExpression;
}
/**
* Return value type that specifies which attributes values (of existing item) should be returned if condition check fails.
*/
public ReturnValuesOnConditionCheckFailure getReturnValuesOnConditionCheckFailure() {
return returnValuesOnConditionCheckFailure;
}
}
/**
* Operation type for transactional write operations.
*/
public enum TransactionWriteOperationType {
Put,
Update,
ConditionCheck,
Delete
}
}