redis | 对象编码种类

server.h/* Objects encoding. Some kind of objects like Strings and Hashes can be * internally represented in multiple ways. The 'encoding' field of the object
 * is set to one of this fields for this object.   对象编码种类*/
#define OBJ_ENCODING_RAW 0     /* Raw representation */
#define OBJ_ENCODING_INT 1     /* Encoded as integer */
#define OBJ_ENCODING_HT 2      /* Encoded as hash table */
#define OBJ_ENCODING_ZIPMAP 3  /* No longer used: old hash encoding. */
#define OBJ_ENCODING_LINKEDLIST 4 /* No longer used: old list encoding. */
#define OBJ_ENCODING_ZIPLIST 5 /* No longer used: old list/hash/zset encoding. */
#define OBJ_ENCODING_INTSET 6  /* Encoded as intset */
#define OBJ_ENCODING_SKIPLIST 7  /* Encoded as skiplist */
#define OBJ_ENCODING_EMBSTR 8  /* Embedded sds string encoding */
#define OBJ_ENCODING_QUICKLIST 9 /* Encoded as linked list of listpacks */
#define OBJ_ENCODING_STREAM 10 /* Encoded as a radix tree of listpacks */
#define OBJ_ENCODING_LISTPACK 11 /* Encoded as a listpack */

/* If the key is open for writing, set the specified module type object
 * as the value of the key, deleting the old value if any.
 * On success REDISMODULE_OK is returned. If the key is not open for
 * writing or there is an active iterator, REDISMODULE_ERR is returned. */
int RM_ModuleTypeSetValue(RedisModuleKey *key, moduleType *mt, void *value) {
    if (!(key->mode & REDISMODULE_WRITE) || key->iter) return REDISMODULE_ERR;
    RM_DeleteKey(key);
    robj *o = createModuleObject(mt,value);
    setKey(key->ctx->client,key->db,key->key,o,SETKEY_NO_SIGNAL);
    decrRefCount(o);
    key->value = o;
    return REDISMODULE_OK;
}

object.c创建对象
robj *createModuleObject(moduleType *mt, void *value) {moduleValue *mv = zmalloc(sizeof(*mv));
    mv->type = mt;
    mv->value = value;
    return createObject(OBJ_MODULE,mv);
}
/* ===================== Creation and parsing of objects ==================== */

robj *createObject(int type, void *ptr) {
    robj *o = zmalloc(sizeof(*o));
    o->type = type;
    o->encoding = OBJ_ENCODING_RAW;
    o->ptr = ptr;
    o->refcount = 1;

    /* Set the LRU to the current lruclock (minutes resolution), or
     * alternatively the LFU counter. */
    if (server.maxmemory_policy & MAXMEMORY_FLAG_LFU) {
        o->lru = (LFUGetTimeInMinutes()<<8) | LFU_INIT_VAL;
    } else {
        o->lru = LRU_CLOCK();
    }
    return o;
}
https://redis.io/docs/reference/modules/
https://www.redis.com.cn/modules.htmlhttps://segmentfault.com/a/1190000020104277?utm_source=tag-newest
https://www.fatalerrors.org/a/research-on-the-workflow-of-redis-source-code-learning.html
https://redis.com/community/redis-modules-hub/how-to-build/