LowLevelBatchWriteSyntax.java

/*
* Copyright 2014-2015 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.codesamples.lowlevel;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.amazonaws.AmazonServiceException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.PropertiesCredentials;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.BatchWriteItemRequest;
import com.amazonaws.services.dynamodbv2.model.DeleteRequest;
import com.amazonaws.services.dynamodbv2.model.PutRequest;
import com.amazonaws.services.dynamodbv2.model.WriteRequest;

// **********************************************************************
// This sample gives syntax for Java Low Level Batch Write 
// It is not included with xi:include but is given here for references
// **********************************************************************

public class LowLevelBatchWriteSyntax {
    
    static AmazonDynamoDBClient client;
    static SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
    
    public static void main(String[] args) throws IOException {

        createClient();

        writeMultipleItemsBatchWrite();  

    }

   private static void createClient() throws IOException {
        AWSCredentials credentials = new PropertiesCredentials(
                LowLevelBatchWriteSyntax.class.getResourceAsStream("AwsCredentials.properties"));

        client = new AmazonDynamoDBClient(credentials);        
    }

    
    private static void writeMultipleItemsBatchWrite() {
        try {
                      
   // Begin syntax extract
            
            
   // Create a map for the requests in the batch
   Map<String, List<WriteRequest>> requestItems = new HashMap<String, List<WriteRequest>>();
    
   // Create a PutRequest for a new Forum item
   Map<String, AttributeValue> forumItem = new HashMap<String, AttributeValue>();
   forumItem.put("Name", new AttributeValue().withS("Amazon RDS"));
   forumItem.put("Threads", new AttributeValue().withN("0"));

   List<WriteRequest> forumList = new ArrayList<WriteRequest>();
   forumList.add(new WriteRequest().withPutRequest(new PutRequest().withItem(forumItem)));
   requestItems.put("Forum", forumList);
   
   // Create a PutRequest for a new Thread item
   Map<String, AttributeValue> threadItem = new HashMap<String, AttributeValue>();
   threadItem.put("ForumName", new AttributeValue().withS("Amazon RDS"));
   threadItem.put("Subject", new AttributeValue().withS("Amazon RDS Thread 1"));

   List<WriteRequest> threadList = new ArrayList<WriteRequest>();
   threadList.add(new WriteRequest().withPutRequest(new PutRequest().withItem(threadItem)));
   
   // Create a DeleteRequest for a Thread item
   Map<String, AttributeValue> threadDeleteKey = new HashMap<String, AttributeValue>(); 
   threadDeleteKey.put("ForumName", new AttributeValue().withS("Some hash attribute value"));
   threadDeleteKey.put("Subject", new AttributeValue().withS("Some range attribute value"));
   
   threadList.add(new WriteRequest().withDeleteRequest(new DeleteRequest().withKey(threadDeleteKey)));
   requestItems.put("Thread", threadList);

   BatchWriteItemRequest batchWriteItemRequest = new BatchWriteItemRequest();
   
   System.out.println("Making the request.");
                        
   batchWriteItemRequest.withRequestItems(requestItems);
   client.batchWriteItem(batchWriteItemRequest);
   
   // End syntax extract

                        
        }  catch (AmazonServiceException ase) {
            System.err.println("Failed to retrieve items: ");
            ase.printStackTrace(System.err);
        }  

    }

}