hash_map* > cached_map;
vector* > cached_entries;
Node * head, *tail;
Node * entries;
bool pthread_safe;
pthread_mutex_t cached_mutex;
};
template
void LRUCache::Put(K key , D data){
cached_lock();
Node *node = cached_map[key];
if(node){
detach(node);
node->data = data;
attach(node);
}
else{
if(cached_entries.empty()){
node = tail->prev;
detach(node);
cached_map.erase(node->key);
}
else{
node = cached_entries.back();
cached_entries.pop_back();
}
node->key = key;
node->data = data;
cached_map[key] = node;
attach(node);
}
cached_unlock();
}
template
D LRUCache::Get(K key){
cached_lock();
Node *node = cached_map[key];
if(node){
detach(node);
attach(node);
cached_unlock();
return node->data;
}
else{
cached_unlock();
return D();
}
}
#endif
测试用例:
[cpp] view plaincopy
/*
Compile:
g++ -o app app.cpp LRUCache.cpp -lpthread
Run:
./app
*/
#include
#include
#include "LRUCache.h"
using namespace std;
int
main(void){
//int k = 10 ,
// max = 100;
int k = 100000 ,
max = 1000000;
LRUCache * lru_cache = new LRUCache(k , true);
int tmp = 0;
for(int i = 0 ; i < 2*k ; ++i){
tmp = rand() % max;
lru_cache->Put(tmp, tmp + 1000000);
cout<
}
for(int i = 0 ; i < k ; ++i){
tmp = rand() % max;
if(lru_cache->Get(tmp) == 0)
cout《"miss : "<
else
cout《"hit : "<