Dyanmodb Enchanced has performance issues

[hxy1991]

Describe the bug

software.amazon.awssdk.enhanced.dynamodb.TableSchema:fromBean()

It takes ten milliseconds each time

Expected Behavior

0ms

Current Behavior

10ms+

Reproduction Steps

public void updateActivity(UserActivity userActivity, String updateExpression, Map<String, AttributeValue> expressionAttributeValues, List<TransactWriteItem> transList) {
    Stopwatch stopwatch = Stopwatch.createStarted();
    Map<String, AttributeValue> keyMap = dynamoDbTable.keyFrom(userActivity).primaryKeyMap(TableSchema.fromBean(UserActivity.class));

    log.info("updateActivity keyMap: {}", stopwatch.elapsed(TimeUnit.MILLISECONDS));

    Update update = Update.builder().updateExpression(updateExpression)
            .expressionAttributeValues(expressionAttributeValues)
            .key(keyMap)
            .tableName(tableName)
            .build();

    log.info("updateActivity update: {}", stopwatch.elapsed(TimeUnit.MILLISECONDS));

    TransactWriteItem transactWriteItem = TransactWriteItem.builder().update(update).build();
    transList.add(transactWriteItem);

    log.info("updateActivity transactWriteItem: {}", stopwatch.elapsed(TimeUnit.MILLISECONDS));
}

Possible Solution

No response

Additional Information/Context

No response

AWS Java SDK version used

dynamodb-enhanced-2.17.123.jar

JDK version used

jdk11

Operating System and version

Linux test-kinjarun-business-deployment-c880e685-d846b4fff-jmhlz 5.4.196-108.356.amzn2.aarch64 #1 SMP Thu May 26 12:49:47 UTC 2022 aarch64 GNU/Linux

[hxy1991]

Sorry, there is something wrong with my usage

software.amazon.awssdk.enhanced.dynamodb.TableSchema.fromBean

Scans a bean class that has been annotated with DynamoDb bean annotations and then returns a BeanTableSchema implementation of this interface that can map records to and from items of that bean class. 
Creating a BeanTableSchema is a moderately expensive operation, and should be performed sparingly. 
This is usually done once at application startup.

The correct usage should be as follows:

private BeanTableSchema<UserActivity> tableSchema = TableSchema.fromBean(UserActivity.class);

public void updateActivity(UserActivity userActivity, String updateExpression, Map<String, AttributeValue> expressionAttributeValues, List<TransactWriteItem> transList) {
    Stopwatch stopwatch = Stopwatch.createStarted();
    Map<String, AttributeValue> keyMap = dynamoDbTable.keyFrom(userActivity).primaryKeyMap(tableSchema);

    log.info("updateActivity keyMap: {}", stopwatch.elapsed(TimeUnit.MILLISECONDS));

    Update update = Update.builder().updateExpression(updateExpression)
            .expressionAttributeValues(expressionAttributeValues)
            .key(keyMap)
            .tableName(tableName)
            .build();

    log.info("updateActivity update: {}", stopwatch.elapsed(TimeUnit.MILLISECONDS));

    TransactWriteItem transactWriteItem = TransactWriteItem.builder().update(update).build();
    transList.add(transactWriteItem);

    log.info("updateActivity transactWriteItem: {}", stopwatch.elapsed(TimeUnit.MILLISECONDS));
}

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