-
Notifications
You must be signed in to change notification settings - Fork 2.3k
/
RestartableDatabase.scala
105 lines (93 loc) · 3.42 KB
/
RestartableDatabase.scala
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
/*
* 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.cypher.docgen.tooling
/*
* Copyright (c) 2002-2015 "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/>.
*/
import org.neo4j.cypher.internal.ExecutionEngine
import org.neo4j.cypher.javacompat.internal.GraphDatabaseCypherService
import org.neo4j.test.TestGraphDatabaseFactory
import scala.util.Try
/* I exist so my users can have a restartable database that is lazily created */
class RestartableDatabase(init: Seq[String], factory: TestGraphDatabaseFactory = new TestGraphDatabaseFactory()) {
private var _db: GraphDatabaseCypherService = null
private var _engine: ExecutionEngine = null
private var _failures: Seq[QueryRunResult] = null
private var _markedForRestart = false
/*
This is the public way of controlling when it's safe to restart the database
*/
def nowIsASafePointToRestartDatabase() = if(_markedForRestart) restart()
private def createAndStartIfNecessary() {
if (_db == null) {
_db = new GraphDatabaseCypherService(factory.newImpermanentDatabase())
_engine = new ExecutionEngine(_db)
_failures = initialize(_engine, init)
}
}
def failures = {
createAndStartIfNecessary()
_failures
}
def getInnerDb = {
createAndStartIfNecessary()
_db
}
def shutdown() {
restart()
}
def execute(q: String) = {
createAndStartIfNecessary()
val executionResult = try {
_engine.execute(q)
} catch {
case e: Throwable => _markedForRestart = true; throw e
}
_markedForRestart = executionResult.queryStatistics().containsUpdates
executionResult
}
private def restart() {
if (_db == null) return
_db.getGraphDatabaseService.shutdown()
_db = null
_markedForRestart = false
}
private def initialize(engine: ExecutionEngine, init: Seq[String]): Seq[QueryRunResult] =
init.flatMap { q =>
val result = Try(engine.execute(q))
result.failed.toOption.map((e: Throwable) => QueryRunResult(q, new ErrorPlaceHolder(), Left(e)))
}
}