rik/jlibredis
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

optimized writeInt

Browse Source
This commit is contained in:
Alex Tkachman
2010-09-11 21:48:36 +03:00
parent a521841ff5
commit b573526a0d
2 changed files with 83 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
src/main/java/redis/clients/util/RedisOutputStream.java
View File

@@ -61,7 +61,7 @@ public final class RedisOutputStream extends FilterOutputStream {
}
}
public void write(String str, CharsetEncoder encoder) throws IOException {
public void writeString(String str, CharsetEncoder encoder) throws IOException {
final CharBuffer in = CharBuffer.wrap(str);
if (in.remaining() == 0)
return;
@@ -91,8 +91,83 @@ public final class RedisOutputStream extends FilterOutputStream {
}
}
private final static int [] sizeTable = { 9, 99, 999, 9999, 99999, 999999, 9999999, 99999999, 999999999, Integer.MAX_VALUE };
private final static byte [] DigitTens = {
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'1', '1', '1', '1', '1', '1', '1', '1', '1', '1',
'2', '2', '2', '2', '2', '2', '2', '2', '2', '2',
'3', '3', '3', '3', '3', '3', '3', '3', '3', '3',
'4', '4', '4', '4', '4', '4', '4', '4', '4', '4',
'5', '5', '5', '5', '5', '5', '5', '5', '5', '5',
'6', '6', '6', '6', '6', '6', '6', '6', '6', '6',
'7', '7', '7', '7', '7', '7', '7', '7', '7', '7',
'8', '8', '8', '8', '8', '8', '8', '8', '8', '8',
'9', '9', '9', '9', '9', '9', '9', '9', '9', '9',
} ;
private final static byte [] DigitOnes = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
} ;
private final static byte[] digits = {
'0' , '1' , '2' , '3' , '4' , '5' ,
'6' , '7' , '8' , '9' , 'a' , 'b' ,
'c' , 'd' , 'e' , 'f' , 'g' , 'h' ,
'i' , 'j' , 'k' , 'l' , 'm' , 'n' ,
'o' , 'p' , 'q' , 'r' , 's' , 't' ,
'u' , 'v' , 'w' , 'x' , 'y' , 'z'
};
public void writeInt(int value) throws IOException {
if(value < 0) {
write('-');
value = -value;
}
int size = 0;
while (value > sizeTable[size])
size++;
size++;
if (size >= buf.length - count) {
flushBuffer();
}
int q, r;
int charPos = count + size;
char sign = 0;
// Generate two digits per iteration
while ( value >= 65536) {
q = value / 100;
r = value - ((q << 6) + (q << 5) + (q << 2));
value = q;
buf [--charPos] = DigitOnes[r];
buf [--charPos] = DigitTens[r];
}
for (;;) {
q = (value * 52429) >>> (16+3);
r = value - ((q << 3) + (q << 1)); // r = i-(q*10) ...
buf [--charPos] = digits [r];
value = q;
if (value == 0) break;
}
count += size;
}
public void flush() throws IOException {
flushBuffer();
out.flush();
}
}
}