## ## Copyright(C) 2002 Javanovic Software (http://www.javanovic.com) ## ## This library is free software; you can redistribute it and/or ## modify it under the terms of the GNU Lesser General Public ## License as published by the Free Software Foundation; either ## version 2.1 of the License, or (at your option) any later version. ## ## This library 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 ## Lesser General Public License for more details. ## ## You should have received a copy of the GNU Lesser General Public ## License along with this library; if not, write to the Free Software ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ## //--------------------------------------------------------- // Application: $property.Name // Author : $property.Author // File : CachedObject.java // // Copyright $year $property.Company // Generated at $date.Time // using Karapan Sapi Struts Generator // Visit http://www.javanovic.com //--------------------------------------------------------- package ${build.Package}.util; import java.util.*; public class CachedObject { public Object object = null; private Date dateofExpiration = null; private String identifier = null; private Date lastAccessTime = new Date(); private long numAccess = 1; private int size; // +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ public CachedObject(Object obj, String id, int minutesToLive) { this.object = obj; this.identifier = id; size = objectSize(obj); lastAccessTime = new Date(); // minutesToLive of 0 means it lives on indefinitely. if (minutesToLive != 0) { Calendar cal = Calendar.getInstance(); cal.setTime(lastAccessTime); cal.add(cal.MINUTE, minutesToLive); dateofExpiration = cal.getTime(); } } public void setLastAccessTime(Date lastAccessTime) { this.lastAccessTime = lastAccessTime; } public boolean isExpired() { // Remember if the minutes to live is zero then it lives forever! if (dateofExpiration != null && dateofExpiration.before(new Date())) { return true; } return false; } public String getIdentifier() { return identifier; } public Object getObject() { return object; } public Date getDateofExpiration() { return (this.dateofExpiration); } public Date getLastAccessTime() { return (this.lastAccessTime); } public long getNumAccess() { return (this.numAccess); } public long getSize() { return (this.size); } public double getMixCost() { long milis = new Date().getTime() - lastAccessTime.getTime(); if(milis == 0) { milis = 1; } return (double)numAccess / (double)milis / (double)size; } public double getLRUCost() { long milis = new Date().getTime() - lastAccessTime.getTime(); if(milis == 0) { milis = 1; } return 1.0/(double)milis; } public double getLFUCost() { return (double) numAccess; } public void incNumAccess() { numAccess++; } public boolean equals(Object o2) { try { String key2 = ((CachedObject) o2).getIdentifier(); return identifier.equals(key2); } catch (Exception e) { return false; } } private static int objectSize(Object o) { try { int size = ((List) o).size(); return size + 1; } catch (Exception e) { return 1; } } }
