private void createNodeHistoryItems(
NodeHistory nHistoryDB, String nid, String time, String values) {
nHistoryDB.setNodeID(nid);
nHistoryDB.setTime(time);
nHistoryDB.setSAValues(values);
mapper.save(nHistoryDB);
String hashKey = nid;
String rangeKey = time;
NodeHistory nhKey = new NodeHistory();
nhKey.setNodeID(hashKey);
Condition rangeKeyCondition =
new Condition()
.withComparisonOperator(ComparisonOperator.EQ.toString())
.withAttributeValueList(new AttributeValue().withS(rangeKey));
DynamoDBQueryExpression<NodeHistory> queryExpression =
new DynamoDBQueryExpression<NodeHistory>()
.withHashKeyValues(nhKey)
.withRangeKeyCondition("Time", rangeKeyCondition);
List<NodeHistory> latestNodeHistory = mapper.query(NodeHistory.class, queryExpression);
System.out.println("Item created: ");
for (NodeHistory nh : latestNodeHistory) {
System.out.format(
"SerialNumber=%s, Time=%s, SAValues=%s\n",
nh.getNodeID(), nh.getTime(), nh.getSAValues());
}
}
private void printNodeHistoryItems(String nid, String time) {
String hashKey = nid;
String rangeKey = time;
NodeHistory nhKey = new NodeHistory();
nhKey.setNodeID(hashKey);
List<NodeHistory> latestNodeHistory;
if (time != null) {
Condition rangeKeyCondition =
new Condition()
.withComparisonOperator(ComparisonOperator.EQ.toString())
.withAttributeValueList(new AttributeValue().withS(rangeKey));
DynamoDBQueryExpression<NodeHistory> queryExpression =
new DynamoDBQueryExpression<NodeHistory>()
.withHashKeyValues(nhKey)
.withRangeKeyCondition("Time", rangeKeyCondition);
latestNodeHistory = mapper.query(NodeHistory.class, queryExpression);
} else {
DynamoDBQueryExpression<NodeHistory> queryExpression =
new DynamoDBQueryExpression<NodeHistory>().withHashKeyValues(nhKey);
latestNodeHistory = mapper.query(NodeHistory.class, queryExpression);
}
for (NodeHistory nh : latestNodeHistory) {
System.out.format(
"SerialNumber=%s, Time=%s, SAValues=%s\n",
nh.getNodeID(), nh.getTime(), nh.getSAValues());
}
}
private void deleteNodeHistoryItem(String nid, String time) {
DynamoDBMapperConfig config =
new DynamoDBMapperConfig(DynamoDBMapperConfig.ConsistentReads.CONSISTENT);
NodeHistory updatedItem;
NodeHistory deletedItem;
if (time != null) {
updatedItem = mapper.load(NodeHistory.class, nid, time, config);
mapper.delete(updatedItem);
deletedItem =
mapper.load(NodeHistory.class, updatedItem.getNodeID(), updatedItem.getTime(), config);
} else {
updatedItem = mapper.load(NodeHistory.class, nid, config);
mapper.delete(updatedItem);
deletedItem = mapper.load(NodeHistory.class, updatedItem.getNodeID(), config);
}
if (deletedItem == null) System.out.println("Done - The item is deleted.");
else System.out.println("Fail - The item is still remained.");
}
private List<NodeHistoryEntity> transform(List<NodeHistory> target) {
List<NodeHistoryEntity> list = new ArrayList<>();
for (NodeHistory item : target) {
NodeHistoryEntity temp = new NodeHistoryEntity();
temp.setNID(item.getNodeID());
temp.setSAValues(item.getSAValues());
temp.setTime(item.getTime());
list.add(temp);
}
return list;
}
private void updateNodeHistoryItem(String nid, String time, String values) {
NodeHistory itemRetrieved;
if (time != null) {
itemRetrieved = mapper.load(NodeHistory.class, nid, time);
itemRetrieved.setTime(time);
} else itemRetrieved = mapper.load(NodeHistory.class, nid);
itemRetrieved.setSAValues(values);
System.out.println("Item updated: ");
System.out.format(
"SerialNumber=%s, Time=%s, SAValues=%s\n",
itemRetrieved.getNodeID(), itemRetrieved.getTime(), itemRetrieved.getSAValues());
}
public List<NodeHistoryEntity> findNodeHistoriesbyNodeID(String id) {
DynamoDBScanExpression scanExpression = new DynamoDBScanExpression();
scanExpression.addFilterCondition(
"NodeID",
new Condition()
.withComparisonOperator(ComparisonOperator.EQ)
.withAttributeValueList(new AttributeValue().withS(id)));
List<NodeHistory> scanResult = mapper.scan(NodeHistory.class, scanExpression);
List<NodeHistoryEntity> list = new ArrayList<>();
for (NodeHistory n : scanResult) {
NodeHistoryEntity nhe = new NodeHistoryEntity();
nhe.setNID(n.getNodeID());
nhe.setTime(n.getTime());
nhe.setSAValues(n.getSAValues());
list.add(nhe);
}
return list;
}
private List<NodeHistoryEntity> findNodeHistories(String nid, String time) {
String hashKey = nid;
String rangeKey = time;
NodeHistory nhKey = new NodeHistory();
nhKey.setNodeID(hashKey);
List<NodeHistory> latestNodeHistory;
if (time != null) {
Condition rangeKeyCondition =
new Condition()
.withComparisonOperator(ComparisonOperator.EQ.toString())
.withAttributeValueList(new AttributeValue().withS(rangeKey));
DynamoDBQueryExpression<NodeHistory> queryExpression =
new DynamoDBQueryExpression<NodeHistory>()
.withHashKeyValues(nhKey)
.withRangeKeyCondition("Time", rangeKeyCondition);
latestNodeHistory = mapper.query(NodeHistory.class, queryExpression);
} else {
DynamoDBQueryExpression<NodeHistory> queryExpression =
new DynamoDBQueryExpression<NodeHistory>().withHashKeyValues(nhKey);
latestNodeHistory = mapper.query(NodeHistory.class, queryExpression);
}
List<NodeHistoryEntity> list = new ArrayList<>();
for (NodeHistory n : latestNodeHistory) {
NodeHistoryEntity ret = new NodeHistoryEntity();
ret.setNID(n.getNodeID());
ret.setTime(n.getTime());
ret.setSAValues(n.getSAValues());
list.add(ret);
}
return list;
}