private Map<String, AttributeValue> getConsistentInternal(
String tableName, Key key, int attempt) {
GetItemRequest request = new GetItemRequest(tableName, key);
request.setConsistentRead(true);
try {
GetItemResult result = ddb.getItem(request);
Map<String, AttributeValue> attributes = result.getItem();
if (attributes == null || attributes.isEmpty()) {
return null;
}
return attributes;
} catch (AmazonServiceException e) {
if (DynamoDBUtil.AWS_ERR_CODE_RESOURCE_NOT_FOUND.equals(e.getErrorCode())) {
throw new IllegalArgumentException("no such table: " + tableName, e);
} else if (DynamoDBUtil.AWS_STATUS_CODE_SERVICE_UNAVAILABLE == e.getStatusCode()) {
// retry after a small pause
DynamoDBUtil.sleepBeforeRetry(attempt);
attempt++;
return getConsistentInternal(tableName, key, attempt);
} else {
throw new DataStoreOperationException(
"problem with table: " + tableName + ", key: " + key, e);
}
}
}
protected Map<String, ExpectedAttributeValue> getOptimisticVersionCondition(
String expectedVersion) {
Map<String, ExpectedAttributeValue> expectedMap = new HashMap<String, ExpectedAttributeValue>();
expectedMap.put(
"version", new ExpectedAttributeValue(new AttributeValue().withN(expectedVersion)));
return expectedMap;
}