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1   /**
2    * Copyright (c) 2002-2011 "Neo Technology,"
3    * Network Engine for Objects in Lund AB [http://neotechnology.com]
4    *
5    * This file is part of Neo4j.
6    *
7    * Neo4j is free software: you can redistribute it and/or modify
8    * it under the terms of the GNU General Public License as published by
9    * the Free Software Foundation, either version 3 of the License, or
10   * (at your option) any later version.
11   *
12   * This program is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   * GNU General Public License for more details.
16   *
17   * You should have received a copy of the GNU General Public License
18   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
19   */
20  package org.neo4j.server.rrd;
21  
22  import static org.hamcrest.MatcherAssert.assertThat;
23  import static org.hamcrest.Matchers.greaterThan;
24  import static org.hamcrest.core.Is.is;
25  
26  import java.io.IOException;
27  
28  import javax.management.MalformedObjectNameException;
29  
30  import org.junit.After;
31  import org.junit.Before;
32  import org.junit.Test;
33  import org.neo4j.graphdb.Transaction;
34  import org.neo4j.kernel.ImpermanentGraphDatabase;
35  
36  public class NodeIdsInUseSampleableTest
37  {
38      public ImpermanentGraphDatabase db;
39      public NodeIdsInUseSampleable sampleable;
40  
41      @Test
42      public void emptyDbHasZeroNodesInUse() throws IOException, MalformedObjectNameException
43      {
44          assertThat( sampleable.getValue(), is( 1L ) ); //Reference node is always created in empty dbs
45      }
46  
47      @Test
48      public void addANodeAndSampleableGoesUp() throws IOException, MalformedObjectNameException
49      {
50          long oldValue = sampleable.getValue();
51  
52          createNode( db );
53  
54          assertThat( sampleable.getValue(), greaterThan( oldValue ) );
55      }
56  
57      private void createNode( ImpermanentGraphDatabase db )
58      {
59          Transaction tx = db.beginTx();
60          db.createNode();
61          tx.success();
62          tx.finish();
63      }
64  
65      @Before
66      public void setUp() throws Exception
67      {
68          db = new ImpermanentGraphDatabase();
69          sampleable = new NodeIdsInUseSampleable( db );
70      }
71  
72      @After
73      public void shutdown()
74      {
75          db.shutdown();
76      }
77  }