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);
}
}
}
@Override
public int read(
String table, String key, Set<String> fields, HashMap<String, ByteIterator> result) {
logger.debug("readkey: " + key + " from table: " + table);
GetItemRequest req = new GetItemRequest(table, createPrimaryKey(key));
req.setAttributesToGet(fields);
req.setConsistentRead(consistentRead);
GetItemResult res = null;
try {
res = dynamoDB.getItem(req);
} catch (AmazonServiceException ex) {
logger.error(ex.getMessage());
return SERVER_ERROR;
} catch (AmazonClientException ex) {
logger.error(ex.getMessage());
return CLIENT_ERROR;
}
if (null != res.getItem()) {
result.putAll(extractResult(res.getItem()));
logger.debug("Result: " + res.toString());
}
return OK;
}