/* -------------------------------------------------------------------------- */
/* Copyright 2002-2013, OpenNebula Project (OpenNebula.org), C12G Labs        */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may    */
/* not use this file except in compliance with the License. You may obtain    */
/* a copy of the License at                                                   */
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/* http://www.apache.org/licenses/LICENSE-2.0                                 */
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/* Unless required by applicable law or agreed to in writing, software        */
/* distributed under the License is distributed on an "AS IS" BASIS,          */
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/* limitations under the License.                                             */
/* -------------------------------------------------------------------------- */

#ifndef QUOTA_DATASTORE_H_
#define QUOTA_DATASTORE_H_

#include "Quota.h"

/**
 *  DataStore Quotas, defined as:
 *    DATASTORE = [
 *        ID     = <ID of the datastore>
 *        IMAGES = <Max. number of images allowed in the datastore>
 *        SIZE   = <Max. number of MB used in the datastore>
 *        IMAGES_USED = Current number of images in the datastore
 *        SIZE_USED   = Current storage capacity un the datastore
 *    ]
 *
 *   0 = unlimited, default if missing
 */

class QuotaDatastore :  public Quota
{
public:

    QuotaDatastore(bool is_default):
        Quota("DATASTORE_QUOTA",
              "DATASTORE",
              DS_METRICS,
              NUM_DS_METRICS,
              is_default)
    {};

    ~QuotaDatastore(){};

    /**
     *  Check if the resource allocation will exceed the quota limits. If not
     *  the usage counters are updated
     *    @param tmpl template for the resource
     *    @param default_quotas Quotas that contain the default limits
     *    @param error string
     *    @return true if the operation can be performed
     */
    bool check(Template* tmpl, Quotas& default_quotas, string& error);

    /**
     *  Decrement usage counters when deallocating image
     *    @param tmpl template for the resource
     */
    void del(Template* tmpl);

protected:

    /**
     * Gets the default quota identified by its ID.
     *
     *    @param id of the quota
     *    @param default_quotas Quotas that contain the default limits
     *    @param va The quota, if it is found
     *
     *    @return 0 on success, -1 if not found
     */
    int get_default_quota(const string& id,
                        Quotas& default_quotas,
                        VectorAttribute **va);

    static const char * DS_METRICS[];

    static const int NUM_DS_METRICS;
};

#endif /*QUOTA_DATASTORE_H_*/