http://forum.space4j.org/posts/list/1.page JForum - http://www.jforum.net i create index for many attributes and i want to get a list which satisfies more than 1 constraints.
[code]
// indexing QUEUEID, SHIPPINGDONE, TIMENEXTSEND
if (!_indexManager.checkIndex(IX_QUEUESV4_GETMSG))
{
Index _index = new Index(IX_QUEUESV4_GETMSG, MAP_NAME, Index.TYPE.MULTI,
QueuesMessage.class, "queueId", "shippingDone", "timeNextSend");
boolean _ok = _indexManager.createIndex(_index, m_space4J);
// if (_ok)
// logger.info(_index + " created !");
// else
// logger.info("error while creating index" + _index);
}
[/code]
Below how we can get list satisfying one constraint.
[code]
List _messages = null;
MultiMap _multiMap = (MultiMap) m_indexGetMsg.getMap();
_messages = _multiMap.get(new Key(queueId));

return _messages;
[/code]
my question is how we can use multi elements ?, not just one as i did above [color=red]_multiMap.get(new Key(queueId))[/color] and what we can find on phonebook example.

thanks for responses.]]> http://forum.space4j.org/posts/preList/23/56.page http://forum.space4j.org/posts/preList/23/56.page GMT Not sure I followed it, can you rephrase?
]]> http://forum.space4j.org/posts/preList/23/57.page http://forum.space4j.org/posts/preList/23/57.page GMT QueuesMessage.class, "queueId", "shippingDone", "timeNextSend");[/code]

above we create an index for the attributes "queueId", "shippingDone", "timeNextSend".

if i want to research a list that satisfy the constraints queueId = 1, shippingDone = 3 and timeNextSend = 3000.
i find a way just to get a list satisfying juste one constraint ( look the seconde code)

How can i do it??

thank you]]> http://forum.space4j.org/posts/preList/23/58.page http://forum.space4j.org/posts/preList/23/58.page GMT
It does come with a default way of comparing compound keys: the KeyComparator. It compares Strings, Dates and Numbers like you would expect.

If you want to change the default comparator, because you have some complex objects in the compound key, you have to implement you own comparator and pass to the Index when you create it.

[code]
public Index(String name, Object source, TYPE type, Comparator<Key> comp, Class<? extends Object> klass, String... attributes)
[/code]

It does not look like you need your own comparator. If you want to get a list that satisfy queueId = 1, shippingDone = 3 and timeNextSend = 3000 it is very easy:

1) Your index should be a MULTI index, because it is not UNIQUE, meaning you will have more than one record per queueId, shippingDone and timeNextSend.

2) It can be sorted or non-sorted, depending if you want to fetch RANGES or if you want to fetch SORTED results.

3) After creating your index, all you have to do is:

[code]
Collection<Object> coll = (Collection<Object>) usersByAge.get(new Key(1, 3, 3000));
[/code]

If your index is sorted (MULTI_SORTED), you can fetch ranges:

[code]
Map<Key, Collection<User>> map = usersByAge.subMap(new Key(1, 3, 3000), new Key(1, 3, 5000));
[/code]

Refer to here to sort from SortedMaps in Java:

http://download.oracle.com/javase/1.4.2/docs/api/java/util/SortedMap.html

Plus I also recommend you to download and check the Space4J sources if you want to have a better understanding of its internals.

[b]Let me know if it worked for you. Also please share with us what kind of system you are developing with Space4J.[/b]


]]> http://forum.space4j.org/posts/preList/23/59.page http://forum.space4j.org/posts/preList/23/59.page GMT I'll test your recommandation and i'll infrom you about results.]]> http://forum.space4j.org/posts/preList/23/60.page http://forum.space4j.org/posts/preList/23/60.page GMT There were some improvements with Space4J 0.9.2 in the MULTI indexes (sorted and non-sorted).

Please refer to: http://s4j.mentaframework.org/posts/list/24.page
]]> http://forum.space4j.org/posts/preList/23/62.page http://forum.space4j.org/posts/preList/23/62.page GMT