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Do proper bounds-checking in HpackHuffmanDecoder to reduce overhead of IndexOutOfBoundsException creation

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Motivation:

HpackHuffmanDecoder.Decoder did not do any bound-checking but just catched IndexOutOfBoundsException to detect if the array needs to grow. This can be very expensive because of fillInStackTrace()

Modifications:

Add proper bounds checking and grow the array if needed without catching IndexOutOfBoundsException.

Result:

Less overhead if the array needs to grow.
This commit is contained in:
Norman Maurer 2017-06-11 12:47:56 +02:00
parent f00638af52
commit 3f0085c267
1 changed files with 2 additions and 5 deletions
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7
codec-http2/src/main/java/io/netty/handler/codec/http2/HpackHuffmanDecoder.java
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@ -230,16 +230,13 @@ final class HpackHuffmanDecoder {
}
private void append(int i) {
try {
bytes[index] = (byte) i;
} catch (IndexOutOfBoundsException ignore) {
if (bytes.length == index) {
// Always just expand by INITIAL_SIZE
byte[] newBytes = new byte[bytes.length + initialCapacity];
System.arraycopy(bytes, 0, newBytes, 0, bytes.length);
bytes = newBytes;
bytes[index] = (byte) i;
}
index++;
bytes[index++] = (byte) i;
}
}
}