// Gets value out of cache.
// On entry. gCacheMutex must not be held. value must be NULL. status
// must be U_ZERO_ERROR.
// On exit. value and status set to what is in cache at key or on cache
// miss the key's createObject() is called and value and status are set to
// the result of that. In this latter case, best effort is made to add the
// value and status to the cache. If createObject() fails to create a value,
// gNoValue is stored in cache, and value is set to NULL. Caller must call
// removeRef on value if non NULL.
void UnifiedCache::_get(
const CacheKeyBase &key,
const SharedObject *&value,
const void *creationContext,
UErrorCode &status) const {
U_ASSERT(value == NULL);
U_ASSERT(status == U_ZERO_ERROR);
if (_poll(key, value, status)) {
if (value == gNoValue) {
SharedObject::clearPtr(value);
}
return;
}
if (U_FAILURE(status)) {
return;
}
value = key.createObject(creationContext, status);
U_ASSERT(value == NULL || value->hasHardReferences());
U_ASSERT(value != NULL || status != U_ZERO_ERROR);
if (value == NULL) {
SharedObject::copyPtr(gNoValue, value);
}
_putIfAbsentAndGet(key, value, status);
if (value == gNoValue) {
SharedObject::clearPtr(value);
}
}
// Places a new value and creationStatus in the cache for the given key.
// On entry, gCacheMutex must be held. key must not exist in the cache.
// On exit, value and creation status placed under key. Soft reference added
// to value on successful add. On error sets status.
void UnifiedCache::_putNew(
const CacheKeyBase &key,
const SharedObject *value,
const UErrorCode creationStatus,
UErrorCode &status) const {
if (U_FAILURE(status)) {
return;
}
CacheKeyBase *keyToAdopt = key.clone();
if (keyToAdopt == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
keyToAdopt->creationStatus = creationStatus;
uhash_put(fHashtable, keyToAdopt, (void *) value, &status);
if (U_SUCCESS(status)) {
value->addSoftRef();
}
}
void UnifiedCache::_putNew(
const CacheKeyBase &key,
const SharedObject *value,
const UErrorCode creationStatus,
UErrorCode &status) const {
if (U_FAILURE(status)) {
return;
}
CacheKeyBase *keyToAdopt = key.clone();
if (keyToAdopt == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
keyToAdopt->fCreationStatus = creationStatus;
if (value->softRefCount == 0) {
_registerMaster(keyToAdopt, value);
}
void *oldValue = uhash_put(fHashtable, keyToAdopt, (void *) value, &status);
U_ASSERT(oldValue == nullptr);
(void)oldValue;
if (U_SUCCESS(status)) {
value->softRefCount++;
}
}
