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Merge pull request quarkusio#32858 from franz1981/append_buffer
Batching buffer with minChunkSize
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192 changes: 192 additions & 0 deletions
192
...ive/server/vertx/src/main/java/org/jboss/resteasy/reactive/server/vertx/AppendBuffer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,192 @@ | ||
| package org.jboss.resteasy.reactive.server.vertx; | ||
|
|
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| import java.util.ArrayDeque; | ||
| import java.util.Objects; | ||
|
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| import io.netty.buffer.ByteBuf; | ||
| import io.netty.buffer.ByteBufAllocator; | ||
| import io.netty.buffer.CompositeByteBuf; | ||
|
|
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| /** | ||
| * It is a bounded (direct) buffer container that can keep on accepting data till {@link #capacity} is exhausted.<br> | ||
| * In order to keep appending on it, it can {@link #clear} and consolidate its content as a {@link ByteBuf}. | ||
| */ | ||
| final class AppendBuffer { | ||
| private final ByteBufAllocator allocator; | ||
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| private final int minChunkSize; | ||
| private final int capacity; | ||
| private ByteBuf buffer; | ||
| private ArrayDeque<ByteBuf> otherBuffers; | ||
| private int size; | ||
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| private AppendBuffer(ByteBufAllocator allocator, int minChunkSize, int capacity) { | ||
| this.allocator = allocator; | ||
| this.minChunkSize = Math.min(minChunkSize, capacity); | ||
| this.capacity = capacity; | ||
| } | ||
|
|
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| /** | ||
| * This buffer append data in a single eagerly allocated {@link ByteBuf}. | ||
| */ | ||
| public static AppendBuffer eager(ByteBufAllocator allocator, int capacity) { | ||
| return new AppendBuffer(allocator, capacity, capacity); | ||
| } | ||
|
|
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| /** | ||
| * This buffer append data in multiples {@link ByteBuf}s sized as each {@code len} in {@link #append}.<br> | ||
| * The data is consolidated in a single {@link CompositeByteBuf} on {@link #clear}. | ||
| */ | ||
| public static AppendBuffer exact(ByteBufAllocator allocator, int capacity) { | ||
| return new AppendBuffer(allocator, 0, capacity); | ||
| } | ||
|
|
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| /** | ||
| * This buffer append data in multiples {@link ByteBuf}s which minimum capacity is {@code minChunkSize} or | ||
| * as each {@code len}, if greater than it.<br> | ||
| * The data is consolidated in a single {@link CompositeByteBuf} on {@link #clear}. | ||
| */ | ||
| public static AppendBuffer withMinChunks(ByteBufAllocator allocator, int minChunkSize, int capacity) { | ||
| return new AppendBuffer(allocator, minChunkSize, capacity); | ||
| } | ||
|
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| private ByteBuf lastBuffer() { | ||
| if (otherBuffers == null || otherBuffers.isEmpty()) { | ||
| return buffer; | ||
| } | ||
| return otherBuffers.peekLast(); | ||
| } | ||
|
|
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| /** | ||
| * It returns how many bytes have been appended<br> | ||
| * If returns a value different from {@code len}, is it required to invoke {@link #clear} | ||
| * that would refill the available capacity till {@link #capacity()} | ||
| */ | ||
| public int append(byte[] bytes, int off, int len) { | ||
| Objects.requireNonNull(bytes); | ||
| if (len == 0) { | ||
| return 0; | ||
| } | ||
| int alreadyWritten = 0; | ||
| if (minChunkSize > 0) { | ||
| var lastBuffer = lastBuffer(); | ||
| if (lastBuffer != null) { | ||
| int availableOnLast = lastBuffer.writableBytes(); | ||
| if (availableOnLast > 0) { | ||
| int toWrite = Math.min(len, availableOnLast); | ||
| lastBuffer.writeBytes(bytes, off, toWrite); | ||
| size += toWrite; | ||
| len -= toWrite; | ||
| // we stop if there's no more to append | ||
| if (len == 0) { | ||
| return toWrite; | ||
| } | ||
| off += toWrite; | ||
| alreadyWritten = toWrite; | ||
| } | ||
| } | ||
| } | ||
| final int availableCapacity = capacity - size; | ||
| if (availableCapacity == 0) { | ||
| return alreadyWritten; | ||
| } | ||
| // we can still write some | ||
| int toWrite = Math.min(len, availableCapacity); | ||
| assert toWrite > 0; | ||
| final int chunkCapacity; | ||
| if (minChunkSize > 0) { | ||
| // Cannot allocate less than minChunkSize, till the limit of capacity left | ||
| chunkCapacity = Math.min(Math.max(minChunkSize, toWrite), availableCapacity); | ||
| } else { | ||
| chunkCapacity = toWrite; | ||
| } | ||
| var tmpBuf = allocator.directBuffer(chunkCapacity); | ||
| try { | ||
| tmpBuf.writeBytes(bytes, off, toWrite); | ||
| } catch (Throwable t) { | ||
| tmpBuf.release(); | ||
| throw t; | ||
| } | ||
| if (buffer == null) { | ||
| buffer = tmpBuf; | ||
| } else { | ||
| boolean resetOthers = false; | ||
| try { | ||
| if (otherBuffers == null) { | ||
| otherBuffers = new ArrayDeque<>(); | ||
| resetOthers = true; | ||
| } | ||
| otherBuffers.add(tmpBuf); | ||
| } catch (Throwable t) { | ||
| rollback(alreadyWritten, tmpBuf, resetOthers); | ||
| throw t; | ||
| } | ||
| } | ||
| size += toWrite; | ||
| return toWrite + alreadyWritten; | ||
| } | ||
|
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| private void rollback(int alreadyWritten, ByteBuf tmpBuf, boolean resetOthers) { | ||
| tmpBuf.release(); | ||
| if (resetOthers) { | ||
| otherBuffers = null; | ||
| } | ||
| if (alreadyWritten > 0) { | ||
| var last = lastBuffer(); | ||
| last.writerIndex(last.writerIndex() - alreadyWritten); | ||
| size -= alreadyWritten; | ||
| assert last.writerIndex() > 0; | ||
| } | ||
| } | ||
|
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| public ByteBuf clear() { | ||
| var firstBuf = buffer; | ||
| if (firstBuf == null) { | ||
| return null; | ||
| } | ||
| var others = otherBuffers; | ||
| if (others == null || others.isEmpty()) { | ||
| size = 0; | ||
| buffer = null; | ||
| // super fast-path | ||
| return firstBuf; | ||
| } | ||
| return clearBuffers(); | ||
| } | ||
|
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| private CompositeByteBuf clearBuffers() { | ||
| var firstBuf = buffer; | ||
| var others = otherBuffers; | ||
| var batch = allocator.compositeDirectBuffer(1 + others.size()); | ||
| try { | ||
| buffer = null; | ||
| size = 0; | ||
| batch.addComponent(true, 0, firstBuf); | ||
| for (int i = 0, othersCount = others.size(); i < othersCount; i++) { | ||
| // if addComponent fail, it takes care of releasing curr and throwing the exception: | ||
| batch.addComponent(true, 1 + i, others.poll()); | ||
| } | ||
| return batch; | ||
| } catch (Throwable anyError) { | ||
| batch.release(); | ||
| releaseOthers(others); | ||
| throw anyError; | ||
| } | ||
| } | ||
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| private static void releaseOthers(ArrayDeque<ByteBuf> others) { | ||
| ByteBuf buf; | ||
| while ((buf = others.poll()) != null) { | ||
| buf.release(); | ||
| } | ||
| } | ||
|
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| public int capacity() { | ||
| return capacity; | ||
| } | ||
|
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| public int availableCapacity() { | ||
| return capacity - size; | ||
| } | ||
|
|
||
| } |
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