-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
IsolatedTransactionTokenCreator.java
65 lines (59 loc) · 2.49 KB
/
IsolatedTransactionTokenCreator.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
/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.core;
import java.util.function.Supplier;
import org.neo4j.kernel.impl.store.id.IdGeneratorFactory;
import org.neo4j.kernel.api.KernelAPI;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.api.Statement;
import org.neo4j.kernel.api.exceptions.schema.IllegalTokenNameException;
import org.neo4j.kernel.api.exceptions.schema.TooManyLabelsException;
/**
* Creates a key within its own transaction, such that the command(s) for creating the key
* will be alone in a transaction. If there is a running a transaction while calling this
* it will be temporarily suspended meanwhile.
*/
public abstract class IsolatedTransactionTokenCreator implements TokenCreator
{
protected final IdGeneratorFactory idGeneratorFactory;
private final Supplier<KernelAPI> kernelSupplier;
public IsolatedTransactionTokenCreator( Supplier<KernelAPI> kernelSupplier,
IdGeneratorFactory idGeneratorFactory )
{
this.kernelSupplier = kernelSupplier;
this.idGeneratorFactory = idGeneratorFactory;
}
@Override
public synchronized int getOrCreate( String name ) throws org.neo4j.kernel.api.exceptions.KernelException
{
KernelAPI kernel = kernelSupplier.get();
try ( KernelTransaction transaction = kernel.newTransaction( KernelTransaction.Type.implicit ) )
{
try ( Statement statement = transaction.acquireStatement() )
{
int id = createKey( statement, name );
transaction.success();
return id;
}
}
}
protected abstract int createKey( Statement statement, String name )
throws IllegalTokenNameException, TooManyLabelsException;
}