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Rewrite of how data from Input gets written into records
Instead of going through the stages w/ the queuing and passing objects importing is done by fully executing the importing threads in parallel. All data structures and access patterns ihave been made to allow for concurrent access. Garbage was a big concern previously and so this new importing doesn't create objects for the entities, but instead allow visitors to observe the different fields, directly from an underlying buffer which has been read from the input source.
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144 changes: 144 additions & 0 deletions
144
community/csv/src/main/java/org/neo4j/csv/reader/CharReadableChunker.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,144 @@ | ||
| /* | ||
| * Copyright (c) 2002-2017 "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.csv.reader; | ||
|
|
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| import java.io.IOException; | ||
| import java.util.Arrays; | ||
|
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| import org.neo4j.csv.reader.Source.Chunk; | ||
|
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| /** | ||
| * Chunks up a {@link CharReadable}. | ||
| */ | ||
| public abstract class CharReadableChunker implements Chunker | ||
| { | ||
| protected final CharReadable reader; | ||
| protected final int chunkSize; | ||
| protected volatile long position; | ||
| private char[] backBuffer; // grows on demand | ||
| private int backBufferCursor; | ||
|
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| public CharReadableChunker( CharReadable reader, int chunkSize ) | ||
| { | ||
| this.reader = reader; | ||
| this.chunkSize = chunkSize; | ||
| this.backBuffer = new char[chunkSize >> 4]; | ||
| } | ||
|
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| @Override | ||
| public ChunkImpl newChunk() | ||
| { | ||
| return new ChunkImpl( new char[chunkSize] ); | ||
| } | ||
|
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| @Override | ||
| public void close() throws IOException | ||
| { | ||
| reader.close(); | ||
| } | ||
|
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| public long position() | ||
| { | ||
| return position; | ||
| } | ||
|
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| protected int fillFromBackBuffer( char[] into ) | ||
| { | ||
| if ( backBufferCursor > 0 ) | ||
| { // Read from and reset back buffer | ||
| assert backBufferCursor < chunkSize; | ||
| System.arraycopy( backBuffer, 0, into, 0, backBufferCursor ); | ||
| int result = backBufferCursor; | ||
| backBufferCursor = 0; | ||
| return result; | ||
| } | ||
| return 0; | ||
| } | ||
|
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| protected int storeInBackBuffer( char[] data, int offset, int length ) | ||
| { | ||
| System.arraycopy( data, offset, backBuffer( length ), backBufferCursor, length ); | ||
| backBufferCursor += length; | ||
| return length; | ||
| } | ||
|
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| private char[] backBuffer( int length ) | ||
| { | ||
| if ( backBufferCursor + length > backBuffer.length ) | ||
| { | ||
| backBuffer = Arrays.copyOf( backBuffer, backBufferCursor + length ); | ||
| } | ||
| return backBuffer; | ||
| } | ||
|
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| public static class ChunkImpl implements Chunk | ||
| { | ||
| final char[] buffer; | ||
| private int length; | ||
| private String sourceDescription; | ||
|
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| public ChunkImpl( char[] buffer ) | ||
| { | ||
| this.buffer = buffer; | ||
| } | ||
|
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| public void initialize( int length, String sourceDescription ) | ||
| { | ||
| this.length = length; | ||
| this.sourceDescription = sourceDescription; | ||
| } | ||
|
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| @Override | ||
| public int startPosition() | ||
| { | ||
| return 0; | ||
| } | ||
|
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| @Override | ||
| public String sourceDescription() | ||
| { | ||
| return sourceDescription; | ||
| } | ||
|
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| @Override | ||
| public int maxFieldSize() | ||
| { | ||
| return buffer.length; | ||
| } | ||
|
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| @Override | ||
| public int length() | ||
| { | ||
| return length; | ||
| } | ||
|
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| @Override | ||
| public char[] data() | ||
| { | ||
| return buffer; | ||
| } | ||
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| @Override | ||
| public int backPosition() | ||
| { | ||
| return 0; | ||
| } | ||
| } | ||
| } |
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