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use qsort and bsearch to lookup commands in O(log(N)) instead of O(N)

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This commit is contained in:
Pieter Noordhuis 2010-05-28 22:14:10 +02:00
parent 3caf15e6da
commit 1a132bbc9c
1 changed files with 30 additions and 7 deletions
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37
redis.c
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@ -752,7 +752,9 @@ static void unwatchCommand(redisClient *c);
/* Global vars */
static struct redisServer server; /* server global state */
static struct redisCommand cmdTable[] = {
static struct redisCommand *commandTable;
static unsigned int commandTableSize;
static struct redisCommand readonlyCommandTable[] = {
{"get",getCommand,2,REDIS_CMD_INLINE,NULL,1,1,1},
{"set",setCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,NULL,0,0,0},
{"setnx",setnxCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,NULL,0,0,0},
@ -2247,13 +2249,33 @@ static void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int
}
}
static struct redisCommand *lookupCommand(char *name) {
int j = 0;
while(cmdTable[j].name != NULL) {
if (!strcasecmp(name,cmdTable[j].name)) return &cmdTable[j];
j++;
static int qsortRedisCommands(const void *r1, const void *r2) {
return strcasecmp(
((struct redisCommand*)r1)->name,
((struct redisCommand*)r2)->name);
}
return NULL;
static void sortCommandTable() {
int i = 0, size = 0;
/* Determine and store the size of the command table */
while(readonlyCommandTable[i++].name != NULL) size++;
commandTableSize = size;
/* Copy and sort the read-only version of the command table */
commandTable = (struct redisCommand*)malloc(sizeof(readonlyCommandTable));
memcpy(commandTable,readonlyCommandTable,sizeof(readonlyCommandTable));
qsort(commandTable,size,sizeof(struct redisCommand),qsortRedisCommands);
}
static struct redisCommand *lookupCommand(char *name) {
struct redisCommand tmp = {name,NULL,0,0,NULL,0,0,0};
return bsearch(
&tmp,
commandTable,
commandTableSize,
sizeof(struct redisCommand),
qsortRedisCommands);
}
/* resetClient prepare the client to process the next command */
@ -10935,6 +10957,7 @@ int main(int argc, char **argv) {
time_t start;
initServerConfig();
sortCommandTable();
if (argc == 2) {
if (strcmp(argv[1], "-v") == 0 ||
strcmp(argv[1], "--version") == 0) version();