* Cache that live the lifetime of a backend process and caches a Ucollator object for performing * collation related operations. Open a collator object can be expensive and hence we create this cache. * When the backend process dies all memory associated with the collator cache is cleaned up. * * This is inspired by lookup_collation_cache() in pg_locale.c */
| 883 | * This is inspired by lookup_collation_cache() in pg_locale.c |
| 884 | */ |
| 885 | static ucollator_cache_entry * |
| 886 | LookupUCollatorCache(const char *collationString) |
| 887 | { |
| 888 | ucollator_cache_entry *cache_entry; |
| 889 | bool found; |
| 890 | |
| 891 | if (collation_cache == NULL) |
| 892 | { |
| 893 | /* First time through, initialize the hash table */ |
| 894 | HASHCTL ctl; |
| 895 | memset(&ctl, 0, sizeof(ctl)); |
| 896 | |
| 897 | ctl.keysize = sizeof(char *); |
| 898 | ctl.entrysize = sizeof(ucollator_cache_entry); |
| 899 | |
| 900 | MemoryContext tempContext = AllocSetContextCreate(CurrentMemoryContext, |
| 901 | "Collation Context", |
| 902 | ALLOCSET_DEFAULT_SIZES); |
| 903 | |
| 904 | MemoryContext oldContext = MemoryContextSwitchTo(tempContext); |
| 905 | collation_cache = hash_create("Collator cache", 100, &ctl, |
| 906 | HASH_ELEM | HASH_BLOBS); |
| 907 | MemoryContextSwitchTo(oldContext); |
| 908 | } |
| 909 | |
| 910 | unsigned long collationKey = djb2(collationString); |
| 911 | |
| 912 | cache_entry = hash_search(collation_cache, &collationKey, HASH_ENTER, &found); |
| 913 | if (!found) |
| 914 | { |
| 915 | cache_entry->collationKey = collationKey; |
| 916 | UErrorCode status = U_ZERO_ERROR; |
| 917 | UCollator *collator = ucol_open(collationString, &status); |
| 918 | |
| 919 | if (U_FAILURE(status)) |
| 920 | { |
| 921 | ereport(ERROR, (errcode(ERRCODE_DOCUMENTDB_INTERNALERROR), |
| 922 | errmsg( |
| 923 | "Collation is not supported by ICU for collation language tag: %s", |
| 924 | collationString), |
| 925 | errdetail_log( |
| 926 | "Collation is not supported by ICU for collation language tag: %s", |
| 927 | collationString))); |
| 928 | } |
| 929 | |
| 930 | cache_entry->collator = collator; |
| 931 | } |
| 932 | |
| 933 | return cache_entry; |
| 934 | } |
| 935 | |
| 936 | |
| 937 | /* |
no test coverage detected