in src/main/java/software/amazon/sns/AmazonSNSExtendedClient.java [202:220]
private PublishRequest storeMessageInExtendedStore(PublishRequest publishRequest, long messageAttributeSize) {
String messageContentStr = publishRequest.getMessage();
Long messageContentSize = Util.getStringSizeInBytes(messageContentStr);
String s3Key = getS3keyAttribute(publishRequest.getMessageAttributes()) ;
String largeMessagePointer = payloadStore.storeOriginalPayload(messageContentStr,
messageContentSize, s3Key);
publishRequest.setMessage(largeMessagePointer);
MessageAttributeValue messageAttributeValue = new MessageAttributeValue();
messageAttributeValue.setDataType("Number");
messageAttributeValue.setStringValue(messageContentSize.toString());
publishRequest.addMessageAttributesEntry(SQSExtendedClientConstants.RESERVED_ATTRIBUTE_NAME, messageAttributeValue);
messageAttributeSize += getMessageAttributeSize(SQSExtendedClientConstants.RESERVED_ATTRIBUTE_NAME, messageAttributeValue);
checkSizeOfMessageAttributes(messageAttributeSize);
return publishRequest;
}