Ejemplos de quicklistIndex en C++ (Cpp)

Ejemplo n.º 1

Archivo: t_list.c Proyecto: therenine/redis_source_annotation

// LINDEX key index
// LINDEX命令的实现
void lindexCommand(client *c) {
    //以读操作取出key对象的value值
    robj *o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk);
    //如果key没找到或value对象不是列表类型则直接返回
    if (o == NULL || checkType(c,o,OBJ_LIST)) return;
    long index;
    robj *value = NULL;

    //将index参数转换为long类型的整数，保存在index中
    if ((getLongFromObjectOrReply(c, c->argv[2], &index, NULL) != C_OK))
        return;

    //只对编码为quicklist类型的value对象操作
    if (o->encoding == OBJ_ENCODING_QUICKLIST) {
        quicklistEntry entry;
        //将下标为index的entry节点保存到entry中
        if (quicklistIndex(o->ptr, index, &entry)) {
            if (entry.value) {  //如果vlaue是字符串类型
                //创建一个字符串类型的对象，保存value值
                value = createStringObject((char*)entry.value,entry.sz);
            } else {
                //将整型的value值转换为字符串类型并创建字符串类型的对象
                value = createStringObjectFromLongLong(entry.longval);
            }
            addReplyBulk(c,value);  //发送value对象
            decrRefCount(value);    //释放value对象
        } else {
            addReply(c,shared.nullbulk);    //如果下标为index没找到，则发送空信息
        }
    } else {
        serverPanic("Unknown list encoding");   //发送未知的列表编码类型
    }
}

Ejemplo n.º 2

Archivo: t_list.c Proyecto: RealHacker/redis-plus

void lindexCommand(client *c) {
    robj *o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk);
    if (o == NULL || checkType(c,o,OBJ_LIST)) return;
    long index;
    robj *value = NULL;

    if ((getLongFromObjectOrReply(c, c->argv[2], &index, NULL) != C_OK))
        return;

    if (o->encoding == OBJ_ENCODING_QUICKLIST) {
        quicklistEntry entry;
        if (quicklistIndex(o->ptr, index, &entry)) {
            if (entry.value) {
                value = createStringObject((char*)entry.value,entry.sz);
            } else {
                value = createStringObjectFromLongLong(entry.longval);
            }
            addReplyBulk(c,value);
            decrRefCount(value);
        } else {
            addReply(c,shared.nullbulk);
        }
    } else {
        serverPanic("Unknown list encoding");
    }
}