+/* Factory method to return a set that *can* hold "value". When the object has
+ * an integer-encodable value, an intset will be returned. Otherwise a regular
+ * hash table. */
+robj *setTypeCreate(robj *value) {
+ if (isObjectRepresentableAsLongLong(value,NULL) == REDIS_OK)
+ return createIntsetObject();
+ return createSetObject();
+}
+
+int setTypeAdd(robj *subject, robj *value) {
+ long long llval;
+ if (subject->encoding == REDIS_ENCODING_HT) {
+ if (dictAdd(subject->ptr,value,NULL) == DICT_OK) {
+ incrRefCount(value);
+ return 1;
+ }
+ } else if (subject->encoding == REDIS_ENCODING_INTSET) {
+ if (isObjectRepresentableAsLongLong(value,&llval) == REDIS_OK) {
+ uint8_t success = 0;
+ subject->ptr = intsetAdd(subject->ptr,llval,&success);
+ if (success) {
+ /* Convert to regular set when the intset contains
+ * too many entries. */
+ if (intsetLen(subject->ptr) > server.set_max_intset_entries)
+ setTypeConvert(subject,REDIS_ENCODING_HT);
+ return 1;
+ }
+ } else {
+ /* Failed to get integer from object, convert to regular set. */
+ setTypeConvert(subject,REDIS_ENCODING_HT);
+
+ /* The set *was* an intset and this value is not integer
+ * encodable, so dictAdd should always work. */
+ redisAssert(dictAdd(subject->ptr,value,NULL) == DICT_OK);
+ incrRefCount(value);
+ return 1;
+ }
+ } else {
+ redisPanic("Unknown set encoding");
+ }
+ return 0;
+}
+
+int setTypeRemove(robj *setobj, robj *value) {
+ long long llval;
+ if (setobj->encoding == REDIS_ENCODING_HT) {
+ if (dictDelete(setobj->ptr,value) == DICT_OK) {
+ if (htNeedsResize(setobj->ptr)) dictResize(setobj->ptr);
+ return 1;
+ }
+ } else if (setobj->encoding == REDIS_ENCODING_INTSET) {
+ if (isObjectRepresentableAsLongLong(value,&llval) == REDIS_OK) {
+ int success;
+ setobj->ptr = intsetRemove(setobj->ptr,llval,&success);
+ if (success) return 1;
+ }
+ } else {
+ redisPanic("Unknown set encoding");
+ }
+ return 0;
+}
+
+int setTypeIsMember(robj *subject, robj *value) {
+ long long llval;
+ if (subject->encoding == REDIS_ENCODING_HT) {
+ return dictFind((dict*)subject->ptr,value) != NULL;
+ } else if (subject->encoding == REDIS_ENCODING_INTSET) {
+ if (isObjectRepresentableAsLongLong(value,&llval) == REDIS_OK) {
+ return intsetFind((intset*)subject->ptr,llval);
+ }
+ } else {
+ redisPanic("Unknown set encoding");
+ }
+ return 0;
+}
+
+setTypeIterator *setTypeInitIterator(robj *subject) {
+ setTypeIterator *si = zmalloc(sizeof(setTypeIterator));
+ si->subject = subject;
+ si->encoding = subject->encoding;
+ if (si->encoding == REDIS_ENCODING_HT) {
+ si->di = dictGetIterator(subject->ptr);
+ } else if (si->encoding == REDIS_ENCODING_INTSET) {
+ si->ii = 0;
+ } else {
+ redisPanic("Unknown set encoding");
+ }
+ return si;
+}
+
+void setTypeReleaseIterator(setTypeIterator *si) {
+ if (si->encoding == REDIS_ENCODING_HT)
+ dictReleaseIterator(si->di);
+ zfree(si);
+}
+
+/* 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;
+ if (si->encoding == REDIS_ENCODING_HT) {
+ dictEntry *de = dictNext(si->di);
+ if (de != NULL) {
+ ret = dictGetEntryKey(de);
+ incrRefCount(ret);
+ }
+ } else if (si->encoding == REDIS_ENCODING_INTSET) {
+ int64_t llval;
+ if (intsetGet(si->subject->ptr,si->ii++,&llval))
+ ret = createStringObjectFromLongLong(llval);
+ }
+ return ret;
+}
+
+
+/* Return random element from a non empty set.
+ * The returned element can be a long long 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.
+ *
+ * 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) {
+ if (setobj->encoding == REDIS_ENCODING_HT) {
+ dictEntry *de = dictGetRandomKey(setobj->ptr);
+ *objele = dictGetEntryKey(de);
+ } else if (setobj->encoding == REDIS_ENCODING_INTSET) {
+ *llele = intsetRandom(setobj->ptr);
+ } else {
+ redisPanic("Unknown set encoding");
+ }
+ return setobj->encoding;
+}
+
+unsigned long setTypeSize(robj *subject) {
+ if (subject->encoding == REDIS_ENCODING_HT) {
+ return dictSize((dict*)subject->ptr);
+ } else if (subject->encoding == REDIS_ENCODING_INTSET) {
+ return intsetLen((intset*)subject->ptr);
+ } else {
+ redisPanic("Unknown set encoding");
+ }
+}
+
+/* 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) {
+ setTypeIterator *si;
+ robj *element;
+ redisAssert(subject->type == REDIS_SET);
+
+ if (enc == REDIS_ENCODING_HT) {
+ dict *d = dictCreate(&setDictType,NULL);
+ /* Presize the dict to avoid rehashing */
+ dictExpand(d,intsetLen(subject->ptr));
+
+ /* setTypeGet returns a robj with incremented refcount */
+ si = setTypeInitIterator(subject);
+ while ((element = setTypeNext(si)) != NULL)
+ redisAssert(dictAdd(d,element,NULL) == DICT_OK);
+ setTypeReleaseIterator(si);
+
+ subject->encoding = REDIS_ENCODING_HT;
+ zfree(subject->ptr);
+ subject->ptr = d;
+ } else {
+ redisPanic("Unsupported set conversion");
+ }
+}
+
projects / redis.git / blobdiff