-
Notifications
You must be signed in to change notification settings - Fork 14
/
SharedStorageConnector.java
126 lines (109 loc) · 4.03 KB
/
SharedStorageConnector.java
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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
package cz.cvut.kbss.ontodriver.jena.connector;
import cz.cvut.kbss.ontodriver.config.Configuration;
import cz.cvut.kbss.ontodriver.jena.exception.JenaDriverException;
import org.apache.jena.query.ReadWrite;
import org.apache.jena.rdf.model.*;
import org.apache.jena.system.Txn;
import java.util.Collection;
import java.util.List;
/**
* Main storage connector using the {@link cz.cvut.kbss.ontodriver.jena.config.JenaOntoDriverProperties#READ_COMMITTED} connector strategy.
* <p>
* Adding statements to it actually adds them to the repository.
* <p>
* Note on transactions:
* <p>
* Starting a transaction on this connector also starts a write transaction on the underlying dataset. Commit then commits
* the transaction. Therefore, these transactions should be short. Reading can happen in parallel (as per Jena documentation).
*/
public class SharedStorageConnector extends AbstractStorageConnector {
SharedStorageConnector(Configuration configuration) {
super(configuration);
}
@Override
void initialize() {
this.storage = Storage.create(configuration);
}
@Override
public synchronized void begin() {
verifyOpen();
transaction.begin();
storage.getDataset().begin(ReadWrite.WRITE);
}
@Override
public synchronized void commit() throws JenaDriverException {
verifyOpen();
transaction.verifyActive();
transaction.commit();
storage.writeChanges();
storage.getDataset().commit();
transaction.afterCommit();
}
@Override
public void rollback() {
verifyOpen();
transaction.rollback();
storage.getDataset().abort();
transaction.afterRollback();
}
@Override
public Collection<Statement> find(Resource subject, Property property, RDFNode value) {
verifyOpen();
return Txn.calculateRead(storage.getDataset(), () -> {
final StmtIterator it = storage.getDataset().getDefaultModel().listStatements(subject, property, value);
return it.toList();
});
}
@Override
public Collection<Statement> find(Resource subject, Property property, RDFNode value, String context) {
verifyOpen();
return Txn.calculateRead(storage.getDataset(), () -> {
final StmtIterator it = storage.getDataset().getNamedModel(context)
.listStatements(subject, property, value);
return it.toList();
});
}
@Override
public boolean contains(Resource subject, Property property, RDFNode value) {
verifyOpen();
return Txn.calculateRead(storage.getDataset(),
() -> storage.getDataset().getDefaultModel().contains(subject, property, value));
}
@Override
public boolean contains(Resource subject, Property property, RDFNode value, String context) {
verifyOpen();
return Txn.calculateRead(storage.getDataset(),
() -> storage.getDataset().getNamedModel(context).contains(subject, property, value));
}
@Override
public void add(List<Statement> statements) {
verifyOpen();
transaction.verifyActive();
storage.getDataset().getDefaultModel().add(statements);
}
@Override
public void add(List<Statement> statements, String context) {
verifyOpen();
transaction.verifyActive();
final Model targetGraph = storage.getDataset().getNamedModel(context);
targetGraph.add(statements);
}
@Override
public void remove(List<Statement> statements) {
verifyOpen();
transaction.verifyActive();
storage.getDataset().getDefaultModel().remove(statements);
}
@Override
public void remove(List<Statement> statements, String context) {
verifyOpen();
transaction.verifyActive();
final Model targetGraph = storage.getDataset().getNamedModel(context);
targetGraph.remove(statements);
}
@Override
public synchronized void close() {
storage.close();
super.close();
}
}