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//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.nosql;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.http.HttpServletRequest;
import org.eclipse.jetty.server.session.AbstractSession;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
public class NoSqlSession extends AbstractSession
{
private final static Logger __log = Log.getLogger("org.eclipse.jetty.server.session");
private final NoSqlSessionManager _manager;
private Set<String> _dirty;
private final AtomicInteger _active = new AtomicInteger();
private Object _version;
private long _lastSync;
/* ------------------------------------------------------------ */
public NoSqlSession(NoSqlSessionManager manager, HttpServletRequest request)
{
super(manager, request);
_manager=manager;
save(true);
_active.incrementAndGet();
}
/* ------------------------------------------------------------ */
public NoSqlSession(NoSqlSessionManager manager, long created, long accessed, String clusterId, Object version)
{
super(manager, created,accessed,clusterId);
_manager=manager;
_version=version;
}
/* ------------------------------------------------------------ */
@Override
public Object doPutOrRemove(String name, Object value)
{
synchronized (this)
{
Object old = super.doPutOrRemove(name,value);
if (_manager.getSavePeriod()==-2)
{
save(true);
}
return old;
}
}
@Override
public void setAttribute(String name, Object value)
{
if ( updateAttribute(name,value) )
{
if (_dirty==null)
{
_dirty=new HashSet<String>();
}
_dirty.add(name);
}
}
/*
* a boolean version of the setAttribute method that lets us manage the _dirty set
*/
protected boolean updateAttribute (String name, Object value)
{
Object old=null;
synchronized (this)
{
checkValid();
old=doPutOrRemove(name,value);
}
if (value==null || !value.equals(old))
{
if (old!=null)
unbindValue(name,old);
if (value!=null)
bindValue(name,value);
_manager.doSessionAttributeListeners(this,name,old,value);
return true;
}
return false;
}
/* ------------------------------------------------------------ */
@Override
protected void checkValid() throws IllegalStateException
{
super.checkValid();
}
/* ------------------------------------------------------------ */
@Override
protected boolean access(long time)
{
__log.debug("NoSqlSession:access:active "+_active);
if (_active.incrementAndGet()==1)
{
long period=_manager.getStalePeriod()*1000L;
if (period==0)
refresh();
else if (period>0)
{
long stale=time-_lastSync;
__log.debug("NoSqlSession:access:stale "+stale);
if (stale>period)
refresh();
}
}
return super.access(time);
}
/* ------------------------------------------------------------ */
@Override
protected void complete()
{
super.complete();
if(_active.decrementAndGet()==0)
{
switch(_manager.getSavePeriod())
{
case 0:
save(isValid());
break;
case 1:
if (isDirty())
save(isValid());
break;
}
}
}
/* ------------------------------------------------------------ */
@Override
protected void doInvalidate() throws IllegalStateException
{
super.doInvalidate();
save(false);
}
/* ------------------------------------------------------------ */
protected void save(boolean activateAfterSave)
{
synchronized (this)
{
_version=_manager.save(this,_version,activateAfterSave);
_lastSync=getAccessed();
}
}
/* ------------------------------------------------------------ */
protected void refresh()
{
synchronized (this)
{
_version=_manager.refresh(this,_version);
}
}
/* ------------------------------------------------------------ */
public boolean isDirty()
{
synchronized (this)
{
return _dirty!=null && !_dirty.isEmpty();
}
}
/* ------------------------------------------------------------ */
public Set<String> takeDirty()
{
synchronized (this)
{
Set<String> dirty=_dirty;
if (dirty==null)
dirty= new HashSet<String>();
else
_dirty=null;
return dirty;
}
}
/* ------------------------------------------------------------ */
public Object getVersion()
{
return _version;
}
}
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