}
/* Move to the next entry in the set. Returns the object at the current
- * position, or NULL when the end is reached. This object will have its
- * refcount incremented, so the caller needs to take care of this. */
-robj *setTypeNext(setTypeIterator *si) {
- robj *ret = NULL;
+ * position.
+ *
+ * Since set elements can be internally be stored as redis objects or
+ * simple arrays of integers, setTypeNext returns the encoding of the
+ * set object you are iterating, and will populate the appropriate pointer
+ * (eobj) or (llobj) accordingly.
+ *
+ * When there are no longer elements -1 is returned.
+ * Returned objects ref count is not incremented, so this function is
+ * copy on write friendly. */
+int setTypeNext(setTypeIterator *si, robj **objele, int64_t *llele) {
if (si->encoding == REDIS_ENCODING_HT) {
dictEntry *de = dictNext(si->di);
- if (de != NULL) {
- ret = dictGetEntryKey(de);
- incrRefCount(ret);
- }
+ if (de == NULL) return -1;
+ *objele = dictGetEntryKey(de);
} else if (si->encoding == REDIS_ENCODING_INTSET) {
- int64_t llval;
- if (intsetGet(si->subject->ptr,si->ii++,&llval))
- ret = createStringObjectFromLongLong(llval);
+ if (!intsetGet(si->subject->ptr,si->ii++,llele))
+ return -1;
}
- return ret;
+ return si->encoding;
}
+/* The not copy on write friendly version but easy to use version
+ * of setTypeNext() is setTypeNextObject(), returning new objects
+ * or incrementing the ref count of returned objects. So if you don't
+ * retain a pointer to this object you should call decrRefCount() against it.
+ *
+ * This function is the way to go for write operations where COW is not
+ * an issue as the result will be anyway of incrementing the ref count. */
+robj *setTypeNextObject(setTypeIterator *si) {
+ int64_t intele;
+ robj *objele;
+ int encoding;
+
+ encoding = setTypeNext(si,&objele,&intele);
+ switch(encoding) {
+ case -1: return NULL;
+ case REDIS_ENCODING_INTSET:
+ return createStringObjectFromLongLong(intele);
+ case REDIS_ENCODING_HT:
+ incrRefCount(objele);
+ return objele;
+ default:
+ redisPanic("Unsupported encoding");
+ }
+ return NULL; /* just to suppress warnings */
+}
/* Return random element from a non empty set.
- * The returned element can be a long long value if the set is encoded
+ * The returned element can be a int64_t value if the set is encoded
* as an "intset" blob of integers, or a redis object if the set
* is a regular set.
*
* The caller provides both pointers to be populated with the right
* object. The return value of the function is the object->encoding
* field of the object and is used by the caller to check if the
- * long long pointer or the redis object pointere was populated.
+ * int64_t pointer or the redis object pointere was populated.
*
* When an object is returned (the set was a real set) the ref count
* of the object is not incremented so this function can be considered
- * copy-on-write friendly. */
-int setTypeRandomElement(robj *setobj, robj **objele, long long *llele) {
+ * copy on write friendly. */
+int setTypeRandomElement(robj *setobj, robj **objele, int64_t *llele) {
if (setobj->encoding == REDIS_ENCODING_HT) {
dictEntry *de = dictGetRandomKey(setobj->ptr);
*objele = dictGetEntryKey(de);
/* Convert the set to specified encoding. The resulting dict (when converting
* to a hashtable) is presized to hold the number of elements in the original
* set. */
-void setTypeConvert(robj *subject, int enc) {
+void setTypeConvert(robj *setobj, int enc) {
setTypeIterator *si;
- robj *element;
- redisAssert(subject->type == REDIS_SET);
+ redisAssert(setobj->type == REDIS_SET &&
+ setobj->encoding == REDIS_ENCODING_INTSET);
if (enc == REDIS_ENCODING_HT) {
+ int64_t intele;
dict *d = dictCreate(&setDictType,NULL);
+ robj *element;
+
/* Presize the dict to avoid rehashing */
- dictExpand(d,intsetLen(subject->ptr));
+ dictExpand(d,intsetLen(setobj->ptr));
- /* setTypeGet returns a robj with incremented refcount */
- si = setTypeInitIterator(subject);
- while ((element = setTypeNext(si)) != NULL)
+ /* To add the elements we extract integers and create redis objects */
+ si = setTypeInitIterator(setobj);
+ while (setTypeNext(si,NULL,&intele) != -1) {
+ element = createStringObjectFromLongLong(intele);
redisAssert(dictAdd(d,element,NULL) == DICT_OK);
+ }
setTypeReleaseIterator(si);
- subject->encoding = REDIS_ENCODING_HT;
- zfree(subject->ptr);
- subject->ptr = d;
+ setobj->encoding = REDIS_ENCODING_HT;
+ zfree(setobj->ptr);
+ setobj->ptr = d;
} else {
redisPanic("Unsupported set conversion");
}
void spopCommand(redisClient *c) {
robj *set, *ele;
- long long llele;
+ int64_t llele;
int encoding;
if ((set = lookupKeyWriteOrReply(c,c->argv[1],shared.nullbulk)) == NULL ||
void srandmemberCommand(redisClient *c) {
robj *set, *ele;
- long long llele;
+ int64_t llele;
int encoding;
if ((set = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL ||
void sinterGenericCommand(redisClient *c, robj **setkeys, unsigned long setnum, robj *dstkey) {
robj **sets = zmalloc(sizeof(robj*)*setnum);
setTypeIterator *si;
- robj *ele, *dstset = NULL;
+ robj *eleobj, *dstset = NULL;
+ int64_t intobj;
void *replylen = NULL;
unsigned long j, cardinality = 0;
+ int encoding;
for (j = 0; j < setnum; j++) {
robj *setobj = dstkey ?
* the element against all the other sets, if at least one set does
* not include the element it is discarded */
si = setTypeInitIterator(sets[0]);
- while((ele = setTypeNext(si)) != NULL) {
- for (j = 1; j < setnum; j++)
- if (!setTypeIsMember(sets[j],ele)) break;
+ while((encoding = setTypeNext(si,&eleobj,&intobj)) != -1) {
+ for (j = 1; j < setnum; j++) {
+ if (encoding == REDIS_ENCODING_INTSET) {
+ /* intset with intset is simple... and fast */
+ if (sets[j]->encoding == REDIS_ENCODING_INTSET &&
+ !intsetFind((intset*)sets[j]->ptr,intobj))
+ {
+ break;
+ /* in order to compare an integer with an object we
+ * have to use the generic function, creating an object
+ * for this */
+ } else if (sets[j]->encoding == REDIS_ENCODING_HT) {
+ eleobj = createStringObjectFromLongLong(intobj);
+ if (!setTypeIsMember(sets[j],eleobj)) {
+ decrRefCount(eleobj);
+ break;
+ }
+ decrRefCount(eleobj);
+ }
+ } else if (encoding == REDIS_ENCODING_HT) {
+ /* Optimization... if the source object is integer
+ * encoded AND the target set is an intset, we can get
+ * a much faster path. */
+ if (eleobj->encoding == REDIS_ENCODING_INT &&
+ sets[j]->encoding == REDIS_ENCODING_INTSET &&
+ !intsetFind((intset*)sets[j]->ptr,(long)eleobj->ptr))
+ {
+ break;
+ /* else... object to object check is easy as we use the
+ * type agnostic API here. */
+ } else if (!setTypeIsMember(sets[j],eleobj)) {
+ break;
+ }
+ }
+ }
/* Only take action when all sets contain the member */
if (j == setnum) {
if (!dstkey) {
- addReplyBulk(c,ele);
+ if (encoding == REDIS_ENCODING_HT)
+ addReplyBulk(c,eleobj);
+ else
+ addReplyBulkLongLong(c,intobj);
cardinality++;
} else {
- setTypeAdd(dstset,ele);
+ if (encoding == REDIS_ENCODING_INTSET) {
+ eleobj = createStringObjectFromLongLong(intobj);
+ setTypeAdd(dstset,eleobj);
+ decrRefCount(eleobj);
+ } else {
+ setTypeAdd(dstset,eleobj);
+ }
}
}
- decrRefCount(ele);
}
setTypeReleaseIterator(si);
if (!sets[j]) continue; /* non existing keys are like empty sets */
si = setTypeInitIterator(sets[j]);
- while((ele = setTypeNext(si)) != NULL) {
+ while((ele = setTypeNextObject(si)) != NULL) {
if (op == REDIS_OP_UNION || j == 0) {
if (setTypeAdd(dstset,ele)) {
cardinality++;
if (!dstkey) {
addReplyMultiBulkLen(c,cardinality);
si = setTypeInitIterator(dstset);
- while((ele = setTypeNext(si)) != NULL) {
+ while((ele = setTypeNextObject(si)) != NULL) {
addReplyBulk(c,ele);
decrRefCount(ele);
}
projects / redis.git / blobdiff