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// Copyright (C) 2002 Jon A. Maxwell (JAM)
//
// 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.
package net.sourceforge.jnlp.cache;
import java.io.*;
import java.net.*;
import java.util.*;
import java.lang.reflect.*;
import java.security.*;
import javax.jnlp.*;
import net.sourceforge.jnlp.*;
import net.sourceforge.jnlp.runtime.*;
import net.sourceforge.jnlp.util.*;
/**
* A policy that determines when a resource should be checked for
* an updated version.<p>
*
* @author <a href="mailto:jmaxwell@users.sourceforge.net">Jon A. Maxwell (JAM)</a> - initial author
* @version $Revision: 1.3 $
*/
public class UpdatePolicy {
// todo: implement session updating
// todo: doesn't seem to work in the same JVM, probably because
// Resource is being held by a tracker so it isn't collected;
// then next time a tracker adds the resource even if
// shouldUpdate==true it's state is already marked
// CONNECTED|DOWNLOADED. Let the resource be collected or reset
// to UNINITIALIZED.
public static UpdatePolicy ALWAYS = new UpdatePolicy(0);
public static UpdatePolicy SESSION = new UpdatePolicy(-1);
public static UpdatePolicy FORCE = new UpdatePolicy(Long.MIN_VALUE);
public static UpdatePolicy NEVER = new UpdatePolicy(Long.MAX_VALUE);
private long timeDiff = -1;
/**
* Create a new update policy; this policy always updates the
* entry unless the shouldUpdate method is overridden.
*/
public UpdatePolicy() {
}
/**
* Create an update policy that only checks a file for being
* updated if it has not been checked for longer than the
* specified time.
*
* @param timeDiff how long in ms until update needed
*/
public UpdatePolicy(long timeDiff) {
this.timeDiff = timeDiff;
}
/**
* Returns whether the resource should be checked for being
* up-to-date.
*/
public boolean shouldUpdate(CacheEntry entry) {
long updated = entry.getLastUpdated();
long current = System.currentTimeMillis();
if (current - updated >= timeDiff)
return true;
else
return false;
}
}
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