
/*
 * $Id$
 *
 *
 * SQUID Web Proxy Cache          http://www.squid-cache.org/
 * ----------------------------------------------------------
 *
 *  Squid is the result of efforts by numerous individuals from
 *  the Internet community; see the CONTRIBUTORS file for full
 *  details.   Many organizations have provided support for Squid's
 *  development; see the SPONSORS file for full details.  Squid is
 *  Copyrighted (C) 2001 by the Regents of the University of
 *  California; see the COPYRIGHT file for full details.  Squid
 *  incorporates software developed and/or copyrighted by other
 *  sources; see the CREDITS file for full details.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
 */

#ifndef   SQUID_REMOVALPOLICY_H
#define   SQUID_REMOVALPOLICY_H

#include "squid.h"
#include "cbdata.h"

class RemovalPolicyWalker;
class RemovalPurgeWalker;

class RemovalPolicySettings
{

public:
    RemovalPolicySettings() : type(NULL), args(NULL) {};

    char *type;
    wordlist *args;
};

class RemovalPolicyNode
{

public:
    RemovalPolicyNode() : data(NULL) {}

    void *data;
};

class RemovalPolicy
{
public:
    const char *_type;
    void *_data;
    void (*Free) (RemovalPolicy * policy);
    void (*Add) (RemovalPolicy * policy, StoreEntry * entry, RemovalPolicyNode * node);
    void (*Remove) (RemovalPolicy * policy, StoreEntry * entry, RemovalPolicyNode * node);
    void (*Referenced) (RemovalPolicy * policy, const StoreEntry * entry, RemovalPolicyNode * node);
    void (*Dereferenced) (RemovalPolicy * policy, const StoreEntry * entry, RemovalPolicyNode * node);
    RemovalPolicyWalker *(*WalkInit) (RemovalPolicy * policy);
    RemovalPurgeWalker *(*PurgeInit) (RemovalPolicy * policy, int max_scan);
    void (*Stats) (RemovalPolicy * policy, StoreEntry * entry);
private:
    CBDATA_CLASS2(RemovalPolicy);
};

class RemovalPolicyWalker
{
public:
    RemovalPolicy *_policy;
    void *_data;
    const StoreEntry *(*Next) (RemovalPolicyWalker * walker);
    void (*Done) (RemovalPolicyWalker * walker);
private:
    CBDATA_CLASS2(RemovalPolicyWalker);
};

class RemovalPurgeWalker
{
public:
    RemovalPolicy *_policy;
    void *_data;
    int scanned, max_scan, locked;
    StoreEntry *(*Next) (RemovalPurgeWalker * walker);
    void (*Done) (RemovalPurgeWalker * walker);
private:
    CBDATA_CLASS2(RemovalPurgeWalker);
};

extern RemovalPolicy *createRemovalPolicy(RemovalPolicySettings * settings);

typedef RemovalPolicy *REMOVALPOLICYCREATE(wordlist * args);


#endif /* SQUID_REMOVALPOLICY_H */
