/*
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.visualvm.api.caching;
/**
* Generic representation of a cache entry
* Supports operations based on TTL (time-to-live)
* @author Jaroslav Bachorik
*/
final public class Entry<T> {
private long accessTs;
private long updateTs;
private T object;
public Entry(T content) {
this(content, System.currentTimeMillis());
}
public Entry(T content, long lastModified) {
this.object = content;
accessTs = lastModified;
updateTs = accessTs;
}
/**
*
* @return Returns the "last-accessed" value (in {@linkplain System#currentTimeMillis()} form)
*/
public long getAccessTimeStamp() {
return accessTs;
}
public T getContent() {
return object;
}
/**
*
* @return Returns the "last-updated" value (in {@linkplain System#currentTimeMillis()} form)
*/
public long getUpdateTimeStamp() {
return updateTs;
}
/**
* Sets the "last-accessed" value (in {@linkplain System#currentTimeMillis()} form)
* @param ts Timestamp in {@linkplain System#currentTimeMillis()} form
*/
void setAccessTimeStamp(long ts) {
accessTs = ts;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Entry other = (Entry) obj;
if (this.accessTs != other.accessTs) {
return false;
}
if (this.updateTs != other.updateTs) {
return false;
}
if (this.object != other.object && (this.object == null || !this.object.equals(other.object))) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 5;
hash = 61 * hash + (int) (this.accessTs ^ (this.accessTs >>> 32));
hash = 61 * hash + (int) (this.updateTs ^ (this.updateTs >>> 32));
hash = 61 * hash + (this.object != null ? this.object.hashCode() : 0);
return hash;
}
}