protected Object clone() {
LRUCacheEntry entry = new LRUCacheEntry();
entry.hash = hash;
entry.key = key;
entry.value = value;
entry.expirationTime = expirationTime;
entry.next = (next != null) ? (LRUCacheEntry) next.clone() : null;
return entry;
}
/**
* Maps the specified <code>key</code> to the specified <code>value</code> in this hashtable.
* Neither the key nor the value can be <code>null</code>.
*
* <p>The value can be retrieved by calling the <code>get</code> method with a key that is equal
* to the original key.
*
* @param key the hashtable key.
* @param value the value.
* @return the previous value of the specified key in this hashtable, or <code>null</code> if it
* did not have one.
* @exception NullPointerException if the key or value is <code>null</code>.
* @see java.lang.Object#equals(java.lang.Object)
* @see java.util.LRUCache#get(java.lang.Object)
* @since JDK1.0
*/
public Object put(Object key, Object value) {
// Make sure the value is not null
if (value == null) {
throw new NullPointerException();
}
// Makes sure the key is not already in the hashtable.
LRUCacheEntry tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
// LoggingService.getDefaultLogger().logDebug(this, "=====================>Index: "+index );
for (LRUCacheEntry e = tab[index]; e != null; e = e.next) {
if ((e.hash == hash) && e.key.equals(key)) {
Object old = e.value;
e.value = value;
return old;
}
}
if (count >= threshold) {
// Rehash the table if the threshold is exceeded
rehash();
return put(key, value);
}
// Creates the new entry.
LRUCacheEntry e = new LRUCacheEntry();
e.hash = hash;
e.key = key;
e.value = value;
e.expirationTime = (expirationTime > 0) ? (System.currentTimeMillis() + expirationTime) : -1;
e.next = tab[index];
tab[index] = e;
count++;
if (cacheMonitorThread == null || !cacheMonitorThread.isAlive()) {
cacheMonitorThread = new CacheMonitor(); // new Thread(new CacheMonitor() );
cacheMonitorThread.setDaemon(true);
cacheMonitorThread.setPriority(Thread.NORM_PRIORITY - 1);
cacheMonitorThread.start();
}
return null;
}