@Test
public void testExpiry() throws Exception {
cache.put(1, "apple");
assertEquals("apple", cache.get(1));
assertFalse(cache.isEmpty());
Clock.setTime(3000);
assertNull(cache.get(1));
assertTrue(cache.isEmpty());
}
public static void main(String args[]) {
CacheMap<Integer, String> myCache = new CacheMap<Integer, String>(5);
myCache.put(1, "a");
myCache.put(2, "b");
myCache.put(3, "c");
myCache.put(4, "d");
myCache.put(5, "e");
myCache.put(3, "f");
myCache.put(6, "h");
System.out.println(myCache.get(1));
System.out.println(myCache.get(1));
System.out.println(myCache.get(1));
for (Map.Entry<Integer, String> entry : myCache.entrySet()) {
System.out.println(entry.getKey() + ":" + entry.getValue());
}
}
@Test
public void testRemove() throws Exception {
assertNull(cache.remove(new Integer(1)));
cache.put(new Integer(1), "apple");
assertEquals("apple", cache.remove(new Integer(1)));
assertNull(cache.get(new Integer(1)));
assertEquals(0, cache.size());
}
@Test
public void testPartialExpiry() throws Exception {
// Add an apple, it will expire at 2000
// System.out.println(cache.getTimeToLive());
cache.put(1, "apple");
Clock.setTime(1500);
// System.out.println(cache.getTimeToLive());
// Add an orange, it will expire at 2500
cache.put(2, "orange");
assertEquals("apple", cache.get(1));
assertEquals("orange", cache.get(2));
assertEquals(2, cache.size());
// Set time to 2300 and check that only the apple has disappeared
Clock.setTime(2300);
assertNull(cache.get(1));
assertEquals("orange", cache.get(2));
assertEquals(1, cache.size());
}
public byte[] get(Long key, byte[] data) throws IOException {
byte[] value = cache.get(key);
if (value != null) {
return value;
}
value = overwriteBackup.get(key);
if (value != null) {
return value;
}
value = f.readByHash(key, data);
return value;
}
private CacheElement get(long address) throws IOException {
CacheElement c = map.get(address);
access++;
// if the cache contains the element just return it, we have a cache hit
// this will update the LRU order: the LinkedHashMap will make it the
// newest
//
// the cache element cannot be null so we can avoid to call
// containsKey();
if (c != null) hit++;
// otherwise put a new element inside the cache
// possibly flushing and discarding the eldest element
else c = put(address);
return c;
}
/**
* Reads the object from the storage, returns null if the object isn't there
*
* @param name name of the store
* @return object stored under that name
*/
public Object readObject(String name) {
name = fixFileName(name);
Object o = cache.get(name);
if (o != null) {
return o;
}
DataInputStream d = null;
try {
if (!exists(name)) {
return null;
}
d = new DataInputStream(createInputStream(name));
o = Util.readObject(d);
d.close();
cache.put(name, o);
return o;
} catch (Exception err) {
err.printStackTrace();
Util.getImplementation().cleanup(d);
return null;
}
}
public void flush(long address) throws IOException {
CacheElement c = map.get(address);
if (c != null) c.flush();
}
@Override
protected String selfGet(String key) {
return memoryMap.get(key);
}