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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <src/config.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/queue.h>
#include <parc/algol/parc_Memory.h>
#include <parc/assert/parc_Assert.h>
#include <src/content_store/listLRU.h>
struct list_lru_entry {
void *userData;
// always set to the list
ListLru *parentList;
// indicates if the Entry is currently in the list
bool inList;
TAILQ_ENTRY(list_lru_entry) list;
};
// this defines the TAILQ structure so we can access the tail pointer
TAILQ_HEAD(lru_s, list_lru_entry);
struct list_lru {
struct lru_s head;
size_t itemsInList;
};
void listLRU_EntryDestroy(ListLruEntry **entryPtr) {
parcAssertNotNull(entryPtr,
"Parameter entryPtr must be non-null double pointer");
ListLruEntry *entry = *entryPtr;
if (entry->inList) {
TAILQ_REMOVE(&entry->parentList->head, entry, list);
parcAssertTrue(
entry->parentList->itemsInList > 0,
"Invalid state, removed entry from list, but itemsInList is 0");
entry->parentList->itemsInList--;
}
parcMemory_Deallocate((void **)&entry);
*entryPtr = NULL;
}
void listLRU_EntryMoveToHead(ListLruEntry *entry) {
parcAssertNotNull(entry, "Parameter entry must be non-null");
TAILQ_REMOVE(&entry->parentList->head, entry, list);
TAILQ_INSERT_HEAD(&entry->parentList->head, entry, list);
}
void *listLRU_EntryGetData(ListLruEntry *entry) { return entry->userData; }
ListLru *listLRU_Create() {
ListLru *list = parcMemory_AllocateAndClear(sizeof(ListLru));
parcAssertNotNull(list, "parcMemory_AllocateAndClear(%zu) returned NULL",
sizeof(ListLru));
list->itemsInList = 0;
TAILQ_INIT(&list->head);
return list;
}
void listLRU_Destroy(ListLru **lruPtr) {
parcAssertNotNull(lruPtr, "Parameter lruPtr must be non-null double pointer");
ListLru *lru = *lruPtr;
ListLruEntry *entry = TAILQ_FIRST(&lru->head);
while (entry != NULL) {
ListLruEntry *next = TAILQ_NEXT(entry, list);
listLRU_EntryDestroy(&entry);
entry = next;
}
parcMemory_Deallocate((void **)&lru);
*lruPtr = NULL;
}
ListLruEntry *listLRU_NewHeadEntry(ListLru *lru, void *data) {
parcAssertNotNull(lru, "Parameter lru must be non-null");
parcAssertNotNull(data, "Parameter data must be non-null");
ListLruEntry *entry = parcMemory_AllocateAndClear(sizeof(ListLruEntry));
parcAssertNotNull(entry, "parcMemory_AllocateAndClear(%zu) returned NULL",
sizeof(ListLruEntry));
entry->userData = data;
entry->parentList = lru;
entry->inList = true;
TAILQ_INSERT_HEAD(&lru->head, entry, list);
lru->itemsInList++;
return entry;
}
ListLruEntry *listLRU_PopTail(ListLru *lru) {
parcAssertNotNull(lru, "Parameter lru must be non-null");
ListLruEntry *entry = TAILQ_LAST(&lru->head, lru_s);
if (entry) {
parcAssertTrue(
lru->itemsInList > 0,
"Invalid state, removed entry from list, but itemsInList is 0");
lru->itemsInList--;
TAILQ_REMOVE(&lru->head, entry, list);
entry->inList = false;
}
return entry;
}
size_t listLRU_Length(const ListLru *lru) {
parcAssertNotNull(lru, "Parameter lru must be non-null");
return lru->itemsInList;
}
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