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Backport: Support BlockingDirectBinaryEncoder (#2899)
* AVRO-3983: Allow setting a custom encoder in DataFileWriter (#2874) * AVRO-3871: Add blocking direct binary encoder (#2521) * Java: Add blocking direct binary encoder * Optimize * Comments and more tests * Comments and more tests * Fix rat check * AVRO-3871: Support nested lists/maps in BlockingDirectBinaryEncoder (#2732) * Support nested lists/maps * Add some tests
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lang/java/avro/src/main/java/org/apache/avro/io/BlockingDirectBinaryEncoder.java
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| @@ -0,0 +1,141 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.apache.avro.io; | ||
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| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.io.OutputStream; | ||
| import java.nio.ByteBuffer; | ||
| import java.util.ArrayDeque; | ||
| import java.util.ArrayList; | ||
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| /** | ||
| * An {@link Encoder} for Avro's binary encoding that does not buffer output. | ||
| * <p/> | ||
| * This encoder does not buffer writes in contrast to | ||
| * {@link BufferedBinaryEncoder}. However, it is lighter-weight and useful when: | ||
| * The buffering in BufferedBinaryEncoder is not desired because you buffer a | ||
| * different level or the Encoder is very short-lived. | ||
| * </p> | ||
| * The BlockingDirectBinaryEncoder will encode the number of bytes of the Map | ||
| * and Array blocks. This will allow to postpone the decoding, or skip over it | ||
| * at all. | ||
| * <p/> | ||
| * To construct, use | ||
| * {@link EncoderFactory#blockingDirectBinaryEncoder(OutputStream, BinaryEncoder)} | ||
| * <p/> | ||
| * {@link BlockingDirectBinaryEncoder} instances returned by this method are not | ||
| * thread-safe | ||
| * | ||
| * @see BinaryEncoder | ||
| * @see EncoderFactory | ||
| * @see Encoder | ||
| * @see Decoder | ||
| */ | ||
| public class BlockingDirectBinaryEncoder extends DirectBinaryEncoder { | ||
| private final ArrayList<BufferOutputStream> buffers; | ||
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| private final ArrayDeque<OutputStream> stashedBuffers; | ||
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| private int depth = 0; | ||
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| private final ArrayDeque<Long> blockItemCounts; | ||
|
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| /** | ||
| * Create a writer that sends its output to the underlying stream | ||
| * <code>out</code>. | ||
| * | ||
| * @param out The Outputstream to write to | ||
| */ | ||
| public BlockingDirectBinaryEncoder(OutputStream out) { | ||
| super(out); | ||
| this.buffers = new ArrayList<>(); | ||
| this.stashedBuffers = new ArrayDeque<>(); | ||
| this.blockItemCounts = new ArrayDeque<>(); | ||
| } | ||
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| private void startBlock() { | ||
| stashedBuffers.push(out); | ||
| if (this.buffers.size() <= depth) { | ||
| this.buffers.add(new BufferOutputStream()); | ||
| } | ||
| BufferOutputStream buf = buffers.get(depth); | ||
| buf.reset(); | ||
| this.depth += 1; | ||
| this.out = buf; | ||
| } | ||
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| private void endBlock() { | ||
| if (depth == 0) { | ||
| throw new RuntimeException("Called endBlock, while not buffering a block"); | ||
| } | ||
| this.depth -= 1; | ||
| out = stashedBuffers.pop(); | ||
| BufferOutputStream buffer = this.buffers.get(depth); | ||
| long blockItemCount = blockItemCounts.pop(); | ||
| if (blockItemCount > 0) { | ||
| try { | ||
| // Make it negative, so the reader knows that the number of bytes is coming | ||
| writeLong(-blockItemCount); | ||
| writeLong(buffer.size()); | ||
| writeFixed(buffer.toBufferWithoutCopy()); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public void setItemCount(long itemCount) throws IOException { | ||
| blockItemCounts.push(itemCount); | ||
| } | ||
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| @Override | ||
| public void writeArrayStart() throws IOException { | ||
| startBlock(); | ||
| } | ||
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| @Override | ||
| public void writeArrayEnd() throws IOException { | ||
| endBlock(); | ||
| // Writes another zero to indicate that this is the last block | ||
| super.writeArrayEnd(); | ||
| } | ||
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| @Override | ||
| public void writeMapStart() throws IOException { | ||
| startBlock(); | ||
| } | ||
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| @Override | ||
| public void writeMapEnd() throws IOException { | ||
| endBlock(); | ||
| // Writes another zero to indicate that this is the last block | ||
| super.writeMapEnd(); | ||
| } | ||
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| private static class BufferOutputStream extends ByteArrayOutputStream { | ||
| BufferOutputStream() { | ||
| } | ||
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| ByteBuffer toBufferWithoutCopy() { | ||
| return ByteBuffer.wrap(buf, 0, count); | ||
| } | ||
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| } | ||
| } |
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