LabmdaV2.java

public class BookHandler implements RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> {

    private static final String TABLE_NAME = "books";

    private static final EnhancedRequestDispatcher ENHANCED_REQUEST_DISPATCHER = initDispatcher();
    static {
        ENHANCED_REQUEST_DISPATCHER.warmUp();
    }


    private static EnhancedRequestDispatcher initDispatcher() {
        DynamoDbEnhancedClient dynamoDbEnhancedClient = DynamoDbEnhancedClient.builder()
                .dynamoDbClient(DynamoDbClient.builder()
                        .credentialsProvider(EnvironmentVariableCredentialsProvider.create())
                        .region(Region.US_EAST_1)
                        .build())

                .build();
        DynamoDbTable<Book> dynamoDbTable = dynamoDbEnhancedClient.table(TABLE_NAME, TableSchema.fromBean(Book.class));
        return new EnhancedRequestDispatcher(new EnhancedClientBookStorage(dynamoDbTable), new ObjectMapper());
    }


    @Override
    public APIGatewayProxyResponseEvent handleRequest(APIGatewayProxyRequestEvent apiGatewayProxyRequestEvent, Context context) {
        return ENHANCED_REQUEST_DISPATCHER.dispatch(apiGatewayProxyRequestEvent);
    }
}