//
// ========================================================================
// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under
// the terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0
//
// This Source Code may also be made available under the following
// Secondary Licenses when the conditions for such availability set
// forth in the Eclipse Public License, v. 2.0 are satisfied:
// the Apache License v2.0 which is available at
// https://www.apache.org/licenses/LICENSE-2.0
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.server.session;

import java.util.function.Function;

import jakarta.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

NullSessionCache
Does not actually cache any Session objects. Useful for testing.
Also useful if you do not want to share Session objects with the same id between
simultaneous requests: note that this means that context forwarding can't share
the same id either.
/**
 * NullSessionCache
 *
 * Does not actually cache any Session objects. Useful for testing.
 * Also useful if you do not want to share Session objects with the same id between
 * simultaneous requests: note that this means that context forwarding can't share
 * the same id either.
 */
public class NullSessionCache extends AbstractSessionCache
{
    private static final Logger LOG = LoggerFactory.getLogger(NullSessionCache.class);

    
Params:
handler – The SessionHandler related to this SessionCache/**
     * @param handler The SessionHandler related to this SessionCache
     */
    public NullSessionCache(SessionHandler handler)
    {
        super(handler);
        super.setEvictionPolicy(EVICT_ON_SESSION_EXIT);
    }

    @Override
    public void shutdown()
    {
    }

    @Override
    public Session newSession(SessionData data)
    {
        return new Session(getSessionHandler(), data);
    }

    @Override
    public Session newSession(HttpServletRequest request, SessionData data)
    {
        return new Session(getSessionHandler(), request, data);
    }

    @Override
    public Session doGet(String id)
    {
        //do not cache anything
        return null;
    }

    @Override
    public Session doPutIfAbsent(String id, Session session)
    {
        //nothing was stored previously
        return null;
    }

    @Override
    public boolean doReplace(String id, Session oldValue, Session newValue)
    {
        //always accept new value
        return true;
    }

    @Override
    public Session doDelete(String id)
    {
        return null;
    }

    @Override
    public void setEvictionPolicy(int evictionTimeout)
    {
        if (LOG.isDebugEnabled())
            LOG.debug("Ignoring eviction setting: {}", evictionTimeout);
    }

    @Override
    protected Session doComputeIfAbsent(String id, Function<String, Session> mappingFunction)
    {
        return mappingFunction.apply(id);
    }
}