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More testing and multiple blocks working
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community/kernel/src/main/java/org/neo4j/kernel/impl/index/schema/BlockReader.java
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| @@ -0,0 +1,85 @@ | ||
| /* | ||
| * Copyright (c) 2002-2019 "Neo4j," | ||
| * Neo4j Sweden AB [http://neo4j.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.index.schema; | ||
|
|
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| import java.io.Closeable; | ||
| import java.io.IOException; | ||
|
|
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| import org.neo4j.index.internal.gbptree.Layout; | ||
| import org.neo4j.io.pagecache.PageCursor; | ||
|
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| import static org.neo4j.index.internal.gbptree.DynamicSizeUtil.extractKeySize; | ||
| import static org.neo4j.index.internal.gbptree.DynamicSizeUtil.extractValueSize; | ||
| import static org.neo4j.index.internal.gbptree.DynamicSizeUtil.readKeyValueSize; | ||
|
|
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| public class BlockReader<KEY,VALUE> implements Closeable | ||
| { | ||
| private final long entryCount; | ||
| private final PageCursor pageCursor; | ||
| private final KEY key; | ||
| private final VALUE value; | ||
| private final Layout<KEY,VALUE> layout; | ||
| private long readEntries; | ||
|
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| BlockReader( PageCursor pageCursor, Layout<KEY,VALUE> layout ) | ||
| { | ||
| this.pageCursor = pageCursor; | ||
| this.entryCount = pageCursor.getLong(); | ||
| this.layout = layout; | ||
| this.key = layout.newKey(); | ||
| this.value = layout.newValue(); | ||
| } | ||
|
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| public boolean next() throws IOException | ||
| { | ||
| if ( readEntries >= entryCount ) | ||
| { | ||
| return false; | ||
| } | ||
|
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| long entrySize = readKeyValueSize( pageCursor ); | ||
| layout.readKey( pageCursor, key, extractKeySize( entrySize ) ); | ||
| layout.readValue( pageCursor, value, extractValueSize( entrySize ) ); | ||
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| readEntries++; | ||
| return true; | ||
| } | ||
|
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| public long entryCount() | ||
| { | ||
| return entryCount; | ||
| } | ||
|
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| KEY key() | ||
| { | ||
| return key; | ||
| } | ||
|
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| VALUE value() | ||
| { | ||
| return value; | ||
| } | ||
|
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| @Override | ||
| public void close() throws IOException | ||
| { | ||
| pageCursor.close(); | ||
| } | ||
| } |
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69
community/kernel/src/main/java/org/neo4j/kernel/impl/index/schema/BlockStorageReader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| * Copyright (c) 2002-2019 "Neo4j," | ||
| * Neo4j Sweden AB [http://neo4j.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.index.schema; | ||
|
|
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| import java.io.Closeable; | ||
| import java.io.File; | ||
| import java.io.IOException; | ||
|
|
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| import org.neo4j.index.internal.gbptree.Layout; | ||
| import org.neo4j.io.fs.FileSystemAbstraction; | ||
| import org.neo4j.io.fs.OpenMode; | ||
| import org.neo4j.io.fs.StoreChannel; | ||
| import org.neo4j.io.pagecache.PageCursor; | ||
| import org.neo4j.kernel.impl.transaction.log.ReadAheadChannel; | ||
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| public class BlockStorageReader<KEY,VALUE> implements Closeable | ||
| { | ||
| private final StoreChannel channel; | ||
| private final long blockSize; | ||
| private final FileSystemAbstraction fs; | ||
| private final File file; | ||
| private final Layout<KEY,VALUE> layout; | ||
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| BlockStorageReader( FileSystemAbstraction fs, File file, long blockSize, Layout<KEY,VALUE> layout ) throws IOException | ||
| { | ||
| this.fs = fs; | ||
| this.file = file; | ||
| this.layout = layout; | ||
| this.channel = fs.open( file, OpenMode.READ ); | ||
| this.blockSize = blockSize; | ||
| } | ||
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| public BlockReader<KEY,VALUE> nextBlock() throws IOException | ||
| { | ||
| long position = channel.position(); | ||
| if ( position >= channel.size() ) | ||
| { | ||
| return null; | ||
| } | ||
| StoreChannel blockChannel = fs.open( file, OpenMode.READ ); | ||
| blockChannel.position( position ); | ||
| channel.position( position + blockSize ); | ||
| PageCursor pageCursor = new ReadableChannelPageCursor( new ReadAheadChannel<>( blockChannel ) ); | ||
| return new BlockReader<>( pageCursor, layout ); | ||
| } | ||
|
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| @Override | ||
| public void close() throws IOException | ||
| { | ||
| channel.close(); | ||
| } | ||
| } |
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