redis使用（五）：c非同步介面__redis

hredis提供了，非同步介面，而且可以結合libevent、libev等訊息架構使用；

範例程式碼(結合libevent使用，libevent參考)：

test_asyn.c

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<hiredis/hiredis.h>#include<hiredis/async.h>#include<hiredis/adapters/libevent.h>#include<event2/event.h>//設定get命令的回呼函數void getCallback(redisAsyncContext *c, void *r, void *privdata) {  printf("in get cmd callback \n");  redisReply *reply = r;  if (reply == NULL){      printf("reply == NULL");      return;  }  printf("get cmd:[%s], reply->str:%s\n", (char*)privdata, reply->str);  // Disconnect   redisAsyncDisconnect(c);}//設定串連回呼函數void connectCallback(const redisAsyncContext *c, int status) {  if (status != REDIS_OK) {    printf("in connectCallback Error: %s\n", c->errstr);    return;  }  printf("Connected...\n");}//設定中斷連線回呼函數void disconnectCallback(const redisAsyncContext *c, int status) {  if (status != REDIS_OK) {    printf("in disconnectCallback  Error: %s\n", c->errstr);    return;  }  printf("Disconnected...\n");}int main (int argc, char **argv) {  struct event_base *base = event_base_new();//建立一個libevent事件處理  redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379);//建立非同步串連  if (c->err) {    /* Let *c leak for now... */    printf("Error: %s\n", c->errstr);    return 1;  }  redisLibeventAttach(c,base);//將串連添加到libevent事件處理  redisAsyncSetConnectCallback(c,connectCallback);//設定串連回調  redisAsyncSetDisconnectCallback(c,disconnectCallback);//設定中斷連線回調  redisAsyncCommand(c, NULL, NULL, "SET aaa %b", "bbb", sizeof("bbb"));//發送set命令  redisAsyncCommand(c, getCallback, (char*)"GET aaa", "GET aaa");//發送get命令  event_base_dispatch(base); //開始libevent迴圈。注意在這一步之前redis是不會進行串連的  return 0;}

Makefile

all:test_asyn.c     gcc -o test_asyn test_asyn.c -I/mydir/local/include  -I/mydir/include -L/mydir/local/lib -lhiredis  -L/mydir/lib -levent

執行結果(需要先把/mydir/local/lib和/mydir/lib加入到LD_LIBRARY_PATH)：

$ ./test_asyn Connected...in get cmd callback get cmd:[GET aaa], reply->str:bbbDisconnected...