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Reference decoding across two record units
This commit makes Reference#decode able to decode references that are split between two record units.
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161 changes: 161 additions & 0 deletions
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.../org/neo4j/kernel/impl/store/format/highlimit/SecondaryPageCursorReadDataAdapterTest.java
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| /* | ||
| * 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 Affero 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 Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.kernel.impl.store.format.highlimit; | ||
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| import org.junit.Rule; | ||
| import org.junit.Test; | ||
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| import java.io.IOException; | ||
| import java.nio.ByteBuffer; | ||
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| import org.neo4j.io.pagecache.PageCursor; | ||
| import org.neo4j.io.pagecache.PagedFile; | ||
| import org.neo4j.io.pagecache.StubPageCursor; | ||
| import org.neo4j.test.RandomRule; | ||
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| import static org.junit.Assert.assertEquals; | ||
| import static org.mockito.Matchers.anyInt; | ||
| import static org.mockito.Matchers.anyLong; | ||
| import static org.mockito.Mockito.mock; | ||
| import static org.mockito.Mockito.when; | ||
|
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| public class SecondaryPageCursorReadDataAdapterTest | ||
| { | ||
| @Rule | ||
| public final RandomRule random = new RandomRule(); | ||
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| @Test | ||
| public void getShortEntirelyFromPrimaryCursor() throws Exception | ||
| { | ||
| int secondaryPageId = 42; | ||
| int secondaryCursorOffset = 0; | ||
| int primaryCursorEndOffset = Short.BYTES + 1; // full short can fit into the primary cursor | ||
| short value = (short) random.nextInt(); | ||
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| PageCursor primaryCursor = newPageCursor(); | ||
| PageCursor secondaryCursor = newPageCursor(); | ||
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| writeShortToPrimary( primaryCursor, value ); | ||
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| SecondaryPageCursorReadDataAdapter adapter = new SecondaryPageCursorReadDataAdapter( primaryCursor, | ||
| newPagedFile( secondaryCursor ), secondaryPageId, secondaryCursorOffset, primaryCursorEndOffset, | ||
| PagedFile.PF_SHARED_READ_LOCK ); | ||
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| short read = adapter.getShort( primaryCursor ); | ||
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| assertEquals( value, read ); | ||
| } | ||
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| @Test | ||
| public void getShortEntirelyFromSecondaryCursor() throws Exception | ||
| { | ||
| int secondaryPageId = 42; | ||
| int secondaryCursorOffset = 0; | ||
| int primaryCursorEndOffset = 0; // can't read anything else from the primary cursor | ||
| short value = (short) random.nextInt(); | ||
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| PageCursor primaryCursor = newPageCursor(); | ||
| PageCursor secondaryCursor = newPageCursor(); | ||
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| writeShortToSecondary( secondaryCursor, value ); | ||
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| SecondaryPageCursorReadDataAdapter adapter = new SecondaryPageCursorReadDataAdapter( primaryCursor, | ||
| newPagedFile( secondaryCursor ), secondaryPageId, secondaryCursorOffset, primaryCursorEndOffset, | ||
| PagedFile.PF_SHARED_READ_LOCK ); | ||
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| short read = adapter.getShort( primaryCursor ); | ||
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| assertEquals( value, read ); | ||
| } | ||
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| @Test | ||
| public void getShortFromPrimaryAndSecondaryCursor() throws Exception | ||
| { | ||
| int secondaryPageId = 42; | ||
| int secondaryCursorOffset = 0; | ||
| int primaryCursorEndOffset = Short.BYTES / 2; // only one byte can be read from the primary cursor | ||
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| short value = (short) random.nextInt(); | ||
| ByteBuffer buffer = newByteBuffer( Short.BYTES ); | ||
| buffer.putShort( value ); | ||
| buffer.flip(); | ||
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| PageCursor primaryCursor = newPageCursor(); | ||
| PageCursor secondaryCursor = newPageCursor(); | ||
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| writeByteToPrimary( primaryCursor, buffer.get() ); | ||
| writeByteToSecondary( secondaryCursor, buffer.get() ); | ||
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| SecondaryPageCursorReadDataAdapter adapter = new SecondaryPageCursorReadDataAdapter( primaryCursor, | ||
| newPagedFile( secondaryCursor ), secondaryPageId, secondaryCursorOffset, primaryCursorEndOffset, | ||
| PagedFile.PF_SHARED_READ_LOCK ); | ||
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| short read = adapter.getShort( primaryCursor ); | ||
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| assertEquals( value, read ); | ||
| } | ||
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| private static void writeShortToPrimary( PageCursor cursor, short value ) | ||
| { | ||
| int offset = cursor.getOffset(); | ||
| cursor.putShort( value ); | ||
| cursor.setOffset( offset ); | ||
| } | ||
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| private static void writeByteToPrimary( PageCursor cursor, byte value ) | ||
| { | ||
| int offset = cursor.getOffset(); | ||
| cursor.putByte( value ); | ||
| cursor.setOffset( offset ); | ||
| } | ||
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| private static void writeShortToSecondary( PageCursor cursor, short value ) | ||
| { | ||
| int offset = cursor.getOffset(); | ||
| cursor.putByte( (byte) 0 ); // put dummy header byte for the secondary record unit | ||
| cursor.putShort( value ); | ||
| cursor.setOffset( offset ); | ||
| } | ||
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| private static void writeByteToSecondary( PageCursor cursor, byte value ) | ||
| { | ||
| int offset = cursor.getOffset(); | ||
| cursor.putByte( (byte) 0 ); // put dummy header byte for the secondary record unit | ||
| cursor.putByte( value ); | ||
| cursor.setOffset( offset ); | ||
| } | ||
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| private static PagedFile newPagedFile( PageCursor cursor ) throws IOException | ||
| { | ||
| PagedFile pagedFile = mock( PagedFile.class ); | ||
| when( pagedFile.io( anyLong(), anyInt() ) ).thenReturn( cursor ); | ||
| return pagedFile; | ||
| } | ||
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| private static PageCursor newPageCursor() | ||
| { | ||
| return new StubPageCursor( 0, newByteBuffer( 100 ) ); | ||
| } | ||
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| private static ByteBuffer newByteBuffer( int capacity ) | ||
| { | ||
| return ByteBuffer.allocateDirect( capacity ); | ||
| } | ||
| } |