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Use ByteProcessor.FIND_LF to find end of line

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Motivation:

Each call of ByteBuf.getByte(int) method does boundary checking. This can be eliminated by using ByteBuf.forEachByte(ByteProcessor) method and ByteProcessor.FIND_LF processor.

Modifications:

Find end of line with ByteProcessor.FIND_LF

Result:

A little better performance of LineBasedFrameDecoder.
This commit is contained in:
Sergey Polovko 2016-02-28 22:09:09 +03:00 committed by Norman Maurer
parent a4846e6153
commit a2e113b987
1 changed files with 5 additions and 9 deletions
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14
codec/src/main/java/io/netty/handler/codec/LineBasedFrameDecoder.java
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@ -17,6 +17,7 @@ package io.netty.handler.codec;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.ByteProcessor;
import java.util.List;
@ -152,15 +153,10 @@ public class LineBasedFrameDecoder extends ByteToMessageDecoder {
* Returns -1 if no end of line was found in the buffer.
*/
private static int findEndOfLine(final ByteBuf buffer) {
final int n = buffer.writerIndex();
for (int i = buffer.readerIndex(); i < n; i ++) {
final byte b = buffer.getByte(i);
if (b == '\n') {
int i = buffer.forEachByte(ByteProcessor.FIND_LF);
if (i > 0 && buffer.getByte(i - 1) == '\r') {
i--;
}
return i;
} else if (b == '\r' && i < n - 1 && buffer.getByte(i + 1) == '\n') {
return i; // \r\n
}
}
return -1; // Not found.
}
}