[PATCH 03/12] vinyl: add vy_history_append_stmt helper
Vladimir Davydov
vdavydov.dev at gmail.com
Sun Apr 15 22:55:16 MSK 2018
Currently, we append statements to a history list in an open-coded
manner, using list manipulation functions. This violates encapsulation
and prevents us from making vy_history an independent entity that
could be reused e.g. in vy_read_iterator. Let's introduce a helper
vy_history_append_stmt to hide vy_history implementation details.
---
src/box/vy_point_lookup.c | 51 ++++++++++++++++++-----------------------------
1 file changed, 19 insertions(+), 32 deletions(-)
diff --git a/src/box/vy_point_lookup.c b/src/box/vy_point_lookup.c
index 5d3076d9..d985bdc2 100644
--- a/src/box/vy_point_lookup.c
+++ b/src/box/vy_point_lookup.c
@@ -72,18 +72,26 @@ struct vy_history_node {
};
/**
- * Allocate (region) new history node.
- * @return new node or NULL on memory error (diag is set).
+ * Append an (older) statement to a history list.
+ * Returns 0 on success, -1 on memory allocation error.
*/
-static struct vy_history_node *
-vy_history_node_new(void)
+static int
+vy_history_append_stmt(struct rlist *history, struct tuple *stmt,
+ enum iterator_src_type src_type)
{
struct region *region = &fiber()->gc;
struct vy_history_node *node = region_alloc(region, sizeof(*node));
- if (node == NULL)
+ if (node == NULL) {
diag_set(OutOfMemory, sizeof(*node), "region",
"struct vy_history_node");
- return node;
+ return -1;
+ }
+ node->src_type = src_type;
+ if (node->src_type == ITER_SRC_RUN)
+ tuple_ref(stmt);
+ node->stmt = stmt;
+ rlist_add_tail_entry(history, node, link);
+ return 0;
}
/**
@@ -136,13 +144,7 @@ vy_point_lookup_scan_txw(struct vy_lsm *lsm, struct vy_tx *tx,
return 0;
vy_stmt_counter_acct_tuple(&lsm->stat.txw.iterator.get,
txv->stmt);
- struct vy_history_node *node = vy_history_node_new();
- if (node == NULL)
- return -1;
- node->src_type = ITER_SRC_TXW;
- node->stmt = txv->stmt;
- rlist_add_tail(history, &node->link);
- return 0;
+ return vy_history_append_stmt(history, txv->stmt, ITER_SRC_TXW);
}
/**
@@ -161,14 +163,7 @@ vy_point_lookup_scan_cache(struct vy_lsm *lsm,
return 0;
vy_stmt_counter_acct_tuple(&lsm->cache.stat.get, stmt);
- struct vy_history_node *node = vy_history_node_new();
- if (node == NULL)
- return -1;
-
- node->src_type = ITER_SRC_CACHE;
- node->stmt = stmt;
- rlist_add_tail(history, &node->link);
- return 0;
+ return vy_history_append_stmt(history, stmt, ITER_SRC_CACHE);
}
/**
@@ -198,16 +193,13 @@ vy_point_lookup_scan_mem(struct vy_lsm *lsm, struct vy_mem *mem,
return 0;
while (true) {
- struct vy_history_node *node = vy_history_node_new();
- if (node == NULL)
+ if (vy_history_append_stmt(history, (struct tuple *)stmt,
+ ITER_SRC_MEM) != 0)
return -1;
vy_stmt_counter_acct_tuple(&lsm->stat.memory.iterator.get,
stmt);
- node->src_type = ITER_SRC_MEM;
- node->stmt = (struct tuple *)stmt;
- rlist_add_tail(history, &node->link);
if (vy_history_is_terminal(history))
break;
@@ -269,15 +261,10 @@ vy_point_lookup_scan_slice(struct vy_lsm *lsm, struct vy_slice *slice,
struct tuple *stmt;
rc = vy_run_iterator_next_key(&run_itr, &stmt);
while (rc == 0 && stmt != NULL) {
- struct vy_history_node *node = vy_history_node_new();
- if (node == NULL) {
+ if (vy_history_append_stmt(history, stmt, ITER_SRC_RUN) != 0) {
rc = -1;
break;
}
- node->src_type = ITER_SRC_RUN;
- node->stmt = stmt;
- tuple_ref(stmt);
- rlist_add_tail(history, &node->link);
if (vy_stmt_type(stmt) != IPROTO_UPSERT) {
*terminal_found = true;
break;
--
2.11.0
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