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Streams: refactoring of next entry seek in the iterator.

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After #5161 the code could be made a bit more obvious for newcomers.
This commit is contained in:
antirez 2018-07-24 11:07:27 +02:00
parent 41a886605a
commit 8513f31be0
1 changed files with 11 additions and 7 deletions
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18
src/t_stream.c
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@ -548,15 +548,19 @@ int streamIteratorGetID(streamIterator *si, streamID *id, int64_t *numfields) {
si->master_fields_count = lpGetInteger(si->lp_ele); si->master_fields_count = lpGetInteger(si->lp_ele);
si->lp_ele = lpNext(si->lp,si->lp_ele); /* Seek first field. */ si->lp_ele = lpNext(si->lp,si->lp_ele); /* Seek first field. */
si->master_fields_start = si->lp_ele; si->master_fields_start = si->lp_ele;
/* We are now pointing the start filed of the master entry. If /* We are now pointing to the first field of the master entry.
* we are iterating in reverse order, we need to seek the * We need to seek either the first or the last entry depending
* end of the listpack. */ * on the direction of the iteration. */
if (si->rev) { if (!si->rev) {
si->lp_ele = lpLast(si->lp); /* If we are iterating in normal order, skip the master fields
} else { * to seek the first actual entry. */
/* Skip master fileds to seek the first entry. */
for (uint64_t i = 0; i < si->master_fields_count; i++) for (uint64_t i = 0; i < si->master_fields_count; i++)
si->lp_ele = lpNext(si->lp,si->lp_ele); si->lp_ele = lpNext(si->lp,si->lp_ele);
} else {
/* If we are iterating in reverse direction, just seek the
* last part of the last entry in the listpack (that is, the
* fields count). */
si->lp_ele = lpLast(si->lp);
} }
} else if (si->rev) { } else if (si->rev) {
/* If we are itereating in the reverse order, and this is not /* If we are itereating in the reverse order, and this is not