void listTypeInsert(listTypeEntry *entry, robj *value, int where) {
if (entry->li->encoding == OBJ_ENCODING_QUICKLIST) {
value = getDecodedObject(value);
sds str = value->ptr;
size_t len = sdslen(str);
if (where == LIST_TAIL) {
quicklistInsertAfter((quicklist *)entry->entry.quicklist,
&entry->entry, str, len);
} else if (where == LIST_HEAD) {
quicklistInsertBefore((quicklist *)entry->entry.quicklist,
&entry->entry, str, len);
}
decrRefCount(value);
} else {
serverPanic("Unknown list encoding");
}
}
//列表类型的插入操作，将value对象插到where
void listTypeInsert(listTypeEntry *entry, robj *value, int where) {
//对列表对象编码为quicklist类型操作
if (entry->li->encoding == OBJ_ENCODING_QUICKLIST) {
value = getDecodedObject(value); //解码对象vlaue为字符串类型
sds str = value->ptr; //获得value对象所保存的值
size_t len = sdslen(str); //获得value值的长度
if (where == LIST_TAIL) { //给定的where为列表尾部
//尾插
quicklistInsertAfter((quicklist *)entry->entry.quicklist,
&entry->entry, str, len);
} else if (where == LIST_HEAD) { //给定的where为列表头部
//头插
quicklistInsertBefore((quicklist *)entry->entry.quicklist,
&entry->entry, str, len);
}
decrRefCount(value); //引用计数减1，释放value对象
} else {
serverPanic("Unknown list encoding");
}
}
