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SwapperSetTest.java
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SwapperSetTest.java
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/*
* Copyright (c) 2002-2018 "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.io.pagecache.impl.muninn;
import org.eclipse.collections.api.set.primitive.MutableIntSet;
import org.eclipse.collections.impl.set.mutable.primitive.IntHashSet;
import org.hamcrest.Matcher;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.neo4j.io.pagecache.PageSwapper;
import org.neo4j.io.pagecache.tracing.DummyPageSwapper;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.not;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.fail;
public class SwapperSetTest
{
@Rule
public ExpectedException exception = ExpectedException.none();
SwapperSet set;
@Before
public void setUp()
{
set = new SwapperSet();
}
@Test
public void mustReturnAllocationWithSwapper()
{
DummyPageSwapper a = new DummyPageSwapper( "a", 42 );
DummyPageSwapper b = new DummyPageSwapper( "b", 43 );
short idA = set.allocate( a );
short idB = set.allocate( b );
SwapperSet.SwapperMapping allocA = set.getAllocation( idA );
SwapperSet.SwapperMapping allocB = set.getAllocation( idB );
assertThat( allocA.swapper, is( a ) );
assertThat( allocB.swapper, is( b ) );
}
@Test
public void accessingFreedAllocationMustReturnNull()
{
short id = set.allocate( new DummyPageSwapper( "a", 42 ) );
set.free( id );
assertNull( set.getAllocation( id ) );
}
@Test
public void doubleFreeMustThrow()
{
int id = set.allocate( new DummyPageSwapper( "a", 42 ) );
set.free( id );
exception.expect( IllegalStateException.class );
exception.expectMessage( "double free" );
set.free( id );
}
@Test
public void freedIdsMustNotBeReusedBeforeVacuum()
{
PageSwapper swapper = new DummyPageSwapper( "a", 42 );
MutableIntSet ids = new IntHashSet( 10_000 );
for ( int i = 0; i < 10_000; i++ )
{
allocateFreeAndAssertNotReused( swapper, ids, i );
}
}
private void allocateFreeAndAssertNotReused( PageSwapper swapper, MutableIntSet ids, int i )
{
int id = set.allocate( swapper );
set.free( id );
if ( !ids.add( id ) )
{
fail( "Expected ids.add( id ) to return true for id " + id + " in iteration " + i +
" but it instead returned false" );
}
}
@Test
public void freedAllocationsMustBecomeAvailableAfterVacuum()
{
MutableIntSet allocated = new IntHashSet();
MutableIntSet freed = new IntHashSet();
MutableIntSet vacuumed = new IntHashSet();
MutableIntSet reused = new IntHashSet();
PageSwapper swapper = new DummyPageSwapper( "a", 42 );
allocateAndAddTenThousand( allocated, swapper );
allocated.forEach( id ->
{
set.free( id );
freed.add( id );
} );
set.vacuum( vacuumed::addAll );
allocateAndAddTenThousand( reused, swapper );
assertThat( allocated, is( equalTo( freed ) ) );
assertThat( allocated, is( equalTo( vacuumed ) ) );
assertThat( allocated, is( equalTo( reused ) ) );
}
private void allocateAndAddTenThousand( MutableIntSet allocated, PageSwapper swapper )
{
for ( int i = 0; i < 10_000; i++ )
{
allocateAndAdd( allocated, swapper );
}
}
private void allocateAndAdd( MutableIntSet allocated, PageSwapper swapper )
{
int id = set.allocate( swapper );
allocated.add( id );
}
@Test
public void vacuumMustNotDustOffAnyIdsWhenNoneHaveBeenFreed()
{
PageSwapper swapper = new DummyPageSwapper( "a", 42 );
for ( int i = 0; i < 100; i++ )
{
set.allocate( swapper );
}
MutableIntSet vacuumedIds = new IntHashSet();
set.vacuum( vacuumedIds::addAll );
if ( !vacuumedIds.isEmpty() )
{
throw new AssertionError( "Vacuum found id " + vacuumedIds + " when it should have found nothing" );
}
}
@Test
public void mustNotUseZeroAsSwapperId()
{
PageSwapper swapper = new DummyPageSwapper( "a", 42 );
Matcher<Short> isNotZero = is( not( (short) 0 ) );
for ( int i = 0; i < 10_000; i++ )
{
assertThat( set.allocate( swapper ), isNotZero );
}
}
@Test
public void gettingAllocationZeroMustThrow()
{
exception.expect( IllegalArgumentException.class );
set.getAllocation( (short) 0 );
}
@Test
public void freeOfIdZeroMustThrow()
{
exception.expect( IllegalArgumentException.class );
set.free( 0 );
}
@Test
public void mustKeepTrackOfAvailableSwapperIds()
{
PageSwapper swapper = new DummyPageSwapper( "a", 42 );
short initial = Short.MAX_VALUE - 1;
assertThat( set.countAvailableIds(), is( initial ) );
int id = set.allocate( swapper );
assertThat( set.countAvailableIds(), is( (short) (initial - 1) ) );
set.free( id );
assertThat( set.countAvailableIds(), is( (short) (initial - 1) ) );
set.vacuum( x -> {} );
assertThat( set.countAvailableIds(), is( initial ) );
}
}