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spring boot DynamoDb

Pragya Keshap answered on February 12, 2023 Popularity 8/10 Helpfulness 1/10

answer spring boot DynamoDb

spring boot DynamoDb

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DynamoDB is a fully-managed hosted NoSQL database on AWS, similar to other NoSQL databases such as Cassandra or MongoDB. DynamoDB offers fast, consistent and predictable performance and is massively scalable.

@Repository
public class DynamoDBURLDAO implements UrlDAO {
	
	private static final String URL_TABLE_NAME = "URL";
	private static final String ID_TABLE_NAME = "maxid";
	
	@Autowired
	private AmazonDynamoDB amazonDynamoDB;
	
	/**
	 * This method is responsible for updating the current maximum ID that has been generated and incrementing it by 1
	 * this forms the next shortcode that will be used by the site.
	 *
	 * @return shortcode base 36 encoded.
	 */
	@Override
	public String generateShortCode() {
		DynamoDB dynamoDB = new DynamoDB(amazonDynamoDB);
		Table table = dynamoDB.getTable(ID_TABLE_NAME);

		UpdateItemSpec updateItemSpec = new UpdateItemSpec().withPrimaryKey("id", 1)
				.withUpdateExpression("set shortCode = shortCode + :val")
				.withValueMap(new ValueMap().withNumber(":val", 1)).withReturnValues(ReturnValue.UPDATED_OLD);

		UpdateItemOutcome outcome = table.updateItem(updateItemSpec);

		return Long.toString(Long.parseLong(outcome.getItem().get("shortCode").toString()), 36);
	}
	
	/**
	 * This method is responsible for taking the shortCode and URL and storing that in the DynamoDB table called URL
	 * @param shortCode shortCode to use to store the full URL against
	 * @param url the URL used to generate the shortCode
	 */
	@Override
	public void storeUrl(String shortCode, String url) {
		Map<String, AttributeValue> item = new HashMap<>();
		item.put("shortCode", new AttributeValue(shortCode));
		item.put("url", new AttributeValue(url));
		PutItemRequest request = new PutItemRequest(URL_TABLE_NAME, item);
		amazonDynamoDB.putItem(request);
	}
}

https://www.baeldung.com/spring-data-dynamodb

Popularity 8/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java spring-boot

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Contributed on Feb 12 2023

Pragya Keshap

0 Answers Avg Quality 2/10

spring boot DynamoDb

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