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/* Copyright 2002-2015, OpenNebula Project (OpenNebula.org), C12G Labs        */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may    */
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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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#ifndef QUOTA_IMAGE_H_
#define QUOTA_IMAGE_H_

#include "Quota.h"

/**
 *  Image Quotas, defined as:
 *    IMAGE = [
 *        ID   = <ID of the image>
 *        RVMS       = <Max. number times the image can be instantiated>
 *        RVMS _USED = Current number of VMs using the image
 *    ]
 *
 *   0 = unlimited, default if missing
 */

class QuotaImage :  public Quota
{
public:

    QuotaImage(bool is_default):
        Quota("IMAGE_QUOTA",
              "IMAGE",
              IMAGE_METRICS,
              NUM_IMAGE_METRICS,
              is_default)
    {};

    ~QuotaImage(){};

    /**
     *  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 * IMAGE_METRICS[];

    static const int NUM_IMAGE_METRICS;
};

#endif /*QUOTA_IMAGE_H_*/
