mirror of
https://github.com/OpenNebula/one.git
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146 lines
4.3 KiB
C++
146 lines
4.3 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2015, OpenNebula Project (OpenNebula.org), C12G Labs */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------- */
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#ifndef SNAPSHOTS_H_
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#define SNAPSHOTS_H_
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#include <iostream>
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#include <string>
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#include <map>
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#include <libxml/parser.h>
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#include "Template.h"
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using namespace std;
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class VectorAttribute;
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/**
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* This class represents a list of Snapshots associated to an image or Virtual
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* Machine Disk. The list is in the form:
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* <SNAPSHOTS>
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* <DISK_ID>: of the disk the snapshots are taken from (the initial backing)
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* <ACTIVE>: the current snapshot in use by the VM. 0 for the original DISK
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* <SNAPSHOT>
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* <ID>
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* <TAG>: Description
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* <DATE>: the snapshot was taken
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* <PARENT_ID>: backing for this snapshot, 0 for the original image
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* <PARENT>: Opaque (driver specific) string representing the parent
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* <SOURCE>: Opaque (driver specific) string representing the snapshot
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*/
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class Snapshots
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{
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public:
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Snapshots(int _disk_id);
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virtual ~Snapshots();
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// *************************************************************************
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// Inititalization functions
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// *************************************************************************
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/**
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* Builds the snapshot list from its XML representation. This function
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* is used when importing it from the DB.
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* @param node xmlNode for the template
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* @return 0 on success
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*/
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int from_xml_node(const xmlNodePtr node);
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/**
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* XML Representation of the Snapshots
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*/
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string& to_xml(string& xml) const
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{
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return snapshot_template.to_xml(xml);
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};
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/**
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* Creates a new (empty) snapshot of the active disk
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* @param tag description of this snapshot (optional)
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* @return id of the new snapshot
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*/
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int create_snapshot(const string& tag);
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/**
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* Removes the snapshot from the list
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* @param id of the snapshot
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*/
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int delete_snapshot(unsigned int id);
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/**
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* Set the given snapshot as active. Updates the values of the current
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* snapshot
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*/
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int active_snapshot(unsigned int id, string& error);
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/**
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* Return the disk_id of the snapshot list
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*/
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int get_disk_id()
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{
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return disk_id;
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}
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/**
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* Get Attribute from the given snapshot
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* @param id of the snapshot
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* @param name of the attribute
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*
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* @return value or empty if not found
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*/
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string get_snapshot_attribute(unsigned int id, const char* name);
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private:
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/**
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* Get a snapshot from the pool
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* @param id of the snapshot
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* @return pointer to the snapshot (VectorAttribute) or null
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*/
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VectorAttribute * get_snapshot(unsigned int id);
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/**
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* Text representation of the snapshot pool. To be stored as part of the
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* VM or Image Templates
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*/
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Template snapshot_template;
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/**
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* Next id
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*/
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unsigned int next_snapshot;
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/**
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* Id of the active (current) snapshot, 0 represents the base image
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*/
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unsigned int active;
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/**
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* Id of the disk associated with this snapshot list
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*/
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unsigned int disk_id;
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/**
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* Snapshot pointer map
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*/
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map<unsigned int, VectorAttribute *> snapshot_pool;
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};
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#endif /*SNAPSHOTS_H_*/
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