forked from Datomic/datomic-java-examples
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathTrust.java
More file actions
82 lines (66 loc) · 3.14 KB
/
Copy pathTrust.java
File metadata and controls
82 lines (66 loc) · 3.14 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
package datomic.samples;
import datomic.Connection;
import datomic.Database;
import datomic.Datom;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.concurrent.ExecutionException;
import static datomic.Peer.query;
import static datomic.Peer.tempid;
import static datomic.Util.list;
import static datomic.Util.map;
import static datomic.samples.Fns.scratchConnection;
import static datomic.samples.IO.resource;
import static datomic.samples.IO.transactAll;
import static datomic.samples.PrettyPrint.print;
public class Trust {
public static void main(String[] args) throws IOException, ExecutionException, InterruptedException {
Connection conn = scratchConnection();
URL url = resource("datomic-java-examples/social-news.edn");
transactAll(conn, new InputStreamReader(url.openStream()));
conn.transact(list(map(":db/id", tempid(":db.part/user"),
":story/title", "ElastiCache in 6 minutes",
":story/url", "http://blog.datomic.com/2012/09/elasticache-in-5-minutes.html"),
map(":db/id", tempid(":db.part/tx"),
":source/confidence", 95L))).get();
conn.transact(list(map(":db/id", tempid(":db.part/user"),
":story/title", "Request for Urgent Business Relationship",
":story/url", "http://example.com/bogus-url"),
map(":db/id", tempid(":db.part/tx"),
":source/confidence", 40L))).get();
Database db = conn.db();
System.out.println("\nAll stories...");
print(allStories(db));
System.out.println("\nStories with 90% confidence, by query...");
print(storiesWithHighConfidenceByQuery(db));
System.out.println("\nStories with 90% confidence, by filter...");
print(storiesWithHighConfidenceByFilter(db));
}
public static Object allStories(Database db) {
return query("[:find [?title ...]" +
" :where [_ :story/title ?title]]", db);
}
public static Object storiesWithHighConfidenceByQuery(Database db) {
return query("[:find [?title ...]" +
" :where [_ :story/title ?title ?tx]" +
" [?tx :source/confidence ?conf]" +
" [(<= 90 ?conf)]]", db);
}
/**
* Returns database filtered to only facts whose transactions have
* :source/confidence level of 90% or higher
*/
public static Database filterByConfidence(Database db, final long conf) {
return db.filter(new Database.Predicate<datomic.Datom>() {
public boolean apply(Database db, Datom datom) {
Long confidence = (Long) db.entity(datom.tx()).get(":source/confidence");
return (confidence != null) && (confidence > conf);
}
});
}
public static Object storiesWithHighConfidenceByFilter(Database db) {
return query("[:find [?title ...]" +
" :where [_ :story/title ?title]]", filterByConfidence(db, 90L));
}
}