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/*-
* Copyright (c) 2014-2016 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __schema_add_table --
* Add a table handle to the session's cache.
*/
static int
__schema_add_table(WT_SESSION_IMPL *session,
const char *name, size_t namelen, bool ok_incomplete, WT_TABLE **tablep)
{
WT_DECL_RET;
WT_TABLE *table;
uint64_t bucket;
table = NULL; /* -Wconditional-uninitialized */
/* Make sure the metadata is open before getting other locks. */
WT_RET(__wt_metadata_cursor(session, NULL));
WT_WITH_TABLE_LOCK(session, ret,
ret = __wt_schema_open_table(
session, name, namelen, ok_incomplete, &table));
WT_RET(ret);
bucket = table->name_hash % WT_HASH_ARRAY_SIZE;
TAILQ_INSERT_HEAD(&session->tables, table, q);
TAILQ_INSERT_HEAD(&session->tablehash[bucket], table, hashq);
*tablep = table;
return (0);
}
/*
* __schema_find_table --
* Find the table handle for the named table in the session cache.
*/
static int
__schema_find_table(WT_SESSION_IMPL *session,
const char *name, size_t namelen, WT_TABLE **tablep)
{
WT_TABLE *table;
const char *tablename;
uint64_t bucket;
bucket = __wt_hash_city64(name, namelen) % WT_HASH_ARRAY_SIZE;
restart:
TAILQ_FOREACH(table, &session->tablehash[bucket], hashq) {
tablename = table->name;
(void)WT_PREFIX_SKIP(tablename, "table:");
if (WT_STRING_MATCH(tablename, name, namelen)) {
/*
* Ignore stale tables.
*
* XXX: should be managed the same as btree handles,
* with a local cache in each session and a shared list
* in the connection. There is still a race here
* between checking the generation and opening the
* first column group.
*/
if (table->schema_gen != S2C(session)->schema_gen) {
if (table->refcnt == 0) {
WT_RET(__wt_schema_remove_table(
session, table));
goto restart;
}
continue;
}
*tablep = table;
return (0);
}
}
return (WT_NOTFOUND);
}
/*
* __wt_schema_get_table --
* Get the table handle for the named table.
*/
int
__wt_schema_get_table(WT_SESSION_IMPL *session,
const char *name, size_t namelen, bool ok_incomplete, WT_TABLE **tablep)
{
WT_DECL_RET;
WT_TABLE *table;
*tablep = table = NULL;
ret = __schema_find_table(session, name, namelen, &table);
if (ret == WT_NOTFOUND)
ret = __schema_add_table(
session, name, namelen, ok_incomplete, &table);
if (ret == 0) {
++table->refcnt;
*tablep = table;
}
return (ret);
}
/*
* __wt_schema_release_table --
* Release a table handle.
*/
void
__wt_schema_release_table(WT_SESSION_IMPL *session, WT_TABLE *table)
{
WT_ASSERT(session, table->refcnt > 0);
--table->refcnt;
}
/*
* __wt_schema_destroy_colgroup --
* Free a column group handle.
*/
void
__wt_schema_destroy_colgroup(WT_SESSION_IMPL *session, WT_COLGROUP **colgroupp)
{
WT_COLGROUP *colgroup;
if ((colgroup = *colgroupp) == NULL)
return;
*colgroupp = NULL;
__wt_free(session, colgroup->name);
__wt_free(session, colgroup->source);
__wt_free(session, colgroup->config);
__wt_free(session, colgroup);
}
/*
* __wt_schema_destroy_index --
* Free an index handle.
*/
int
__wt_schema_destroy_index(WT_SESSION_IMPL *session, WT_INDEX **idxp)
{
WT_DECL_RET;
WT_INDEX *idx;
if ((idx = *idxp) == NULL)
return (0);
*idxp = NULL;
/* If there is a custom collator configured, terminate it. */
if (idx->collator != NULL &&
idx->collator_owned && idx->collator->terminate != NULL) {
WT_TRET(idx->collator->terminate(
idx->collator, &session->iface));
idx->collator = NULL;
idx->collator_owned = 0;
}
/* If there is a custom extractor configured, terminate it. */
if (idx->extractor != NULL &&
idx->extractor_owned && idx->extractor->terminate != NULL) {
WT_TRET(idx->extractor->terminate(
idx->extractor, &session->iface));
idx->extractor = NULL;
idx->extractor_owned = 0;
}
__wt_free(session, idx->name);
__wt_free(session, idx->source);
__wt_free(session, idx->config);
__wt_free(session, idx->key_format);
__wt_free(session, idx->key_plan);
__wt_free(session, idx->value_plan);
__wt_free(session, idx->idxkey_format);
__wt_free(session, idx->exkey_format);
__wt_free(session, idx);
return (ret);
}
/*
* __wt_schema_destroy_table --
* Free a table handle.
*/
int
__wt_schema_destroy_table(WT_SESSION_IMPL *session, WT_TABLE **tablep)
{
WT_DECL_RET;
WT_TABLE *table;
u_int i;
if ((table = *tablep) == NULL)
return (0);
*tablep = NULL;
__wt_free(session, table->name);
__wt_free(session, table->config);
__wt_free(session, table->plan);
__wt_free(session, table->key_format);
__wt_free(session, table->value_format);
if (table->cgroups != NULL) {
for (i = 0; i < WT_COLGROUPS(table); i++)
__wt_schema_destroy_colgroup(
session, &table->cgroups[i]);
__wt_free(session, table->cgroups);
}
if (table->indices != NULL) {
for (i = 0; i < table->nindices; i++)
WT_TRET(__wt_schema_destroy_index(
session, &table->indices[i]));
__wt_free(session, table->indices);
}
__wt_free(session, table);
return (ret);
}
/*
* __wt_schema_remove_table --
* Remove the table handle from the session, closing if necessary.
*/
int
__wt_schema_remove_table(WT_SESSION_IMPL *session, WT_TABLE *table)
{
uint64_t bucket;
WT_ASSERT(session, table->refcnt <= 1);
bucket = table->name_hash % WT_HASH_ARRAY_SIZE;
TAILQ_REMOVE(&session->tables, table, q);
TAILQ_REMOVE(&session->tablehash[bucket], table, hashq);
return (__wt_schema_destroy_table(session, &table));
}
/*
* __wt_schema_close_tables --
* Close all of the tables in a session.
*/
int
__wt_schema_close_tables(WT_SESSION_IMPL *session)
{
WT_DECL_RET;
WT_TABLE *table;
while ((table = TAILQ_FIRST(&session->tables)) != NULL)
WT_TRET(__wt_schema_remove_table(session, table));
return (ret);
}
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