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/* -------------------------------------------------------------------------- */
/* Copyright 2002-2012, OpenNebula Project Leads (OpenNebula.org) */
/* */
/* 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 */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
/* See the License for the specific language governing permissions and */
/* limitations under the License. */
/* -------------------------------------------------------------------------- */
#ifndef IMAGE_MANAGER_H_
#define IMAGE_MANAGER_H_
#include "MadManager.h"
#include "ActionManager.h"
#include "ImageManagerDriver.h"
using namespace std;
extern "C" void * image_action_loop(void *arg);
class Image;
class ImageManager : public MadManager, public ActionListener
{
public:
ImageManager(ImagePool * _ipool, vector<const Attribute*>& _mads):
MadManager(_mads), ipool(_ipool)
{
am.addListener(this);
};
~ImageManager(){};
/**
* This functions starts the associated listener thread, and creates a
* new thread for the Information Manager. This thread will wait in
* an action loop till it receives ACTION_FINALIZE.
* @return 0 on success.
*/
int start();
/**
* Loads the Image Driver defined in configuration file
* @param uid of the user executing the driver. When uid is 0 the nebula
* identity will be used. Otherwise the Mad will be loaded through the
* sudo application.
*/
void load_mads(int uid=0);
/**
* Gets the thread identification.
* @return pthread_t for the manager thread (that in the action loop).
*/
pthread_t get_thread_id() const
{
return imagem_thread;
};
/**
* Finalizes the Image Manager
*/
void finalize()
{
am.trigger(ACTION_FINALIZE,0);
};
/**************************************************************************/
/* Image Manager Actions */
/* Operates in a semi-sinchronous mode. Operations will be granted or not */
/* , when needed the image repository drivers will be used to perform FS */
/* operations in the background. */
/**************************************************************************/
/**
* Try to acquire an image from the repository for a VM.
* @param image_id id of image
* @param error string describing the error
* @return pointer to the image or 0 if could not be acquired
*/
Image * acquire_image(int image_id, string& error);
/**
* Try to acquire an image from the repository for a VM.
* @param name of the image
* @param id of owner
* @param error string describing the error
* @return pointer to the image or 0 if could not be acquired
*/
Image * acquire_image(const string& name, int uid, string& error);
/**
* Releases an image and triggers any needed operations in the repo
* @param iid image id of the image to be released
* @param failed the associated VM releasing the images is FAILED
*/
void release_image(int iid, bool failed);
/**
* Enables the image
* @param to_enable true will enable the image.
* @return 0 on success
*/
int enable_image(int iid, bool to_enable);
/**
* Adds a new image to the repository copying or creating it as needed
* @param img pointer to the image
* @param ds_data data of the associated datastore in XML format
* @return 0 on success
*/
int register_image(int iid, const string& ds_data);
/**
* Deletes an image from the repository and the DB
* @param iid id of image
* @return 0 on success
*/
int delete_image(int iid, const string& ds_data);
private:
/**
* Generic name for the Image driver
*/
static const char * image_driver_name;
/**
* Thread id for the Transfer Manager
*/
pthread_t imagem_thread;
/**
* Pointer to the Image Pool to access VMs
*/
ImagePool * ipool;
/**
* Action engine for the Manager
*/
ActionManager am;
/**
* Returns a pointer to the Image Manager Driver used for the Repository
* @return the Image Manager driver or 0 in not found
*/
const ImageManagerDriver * get()
{
string name("NAME");
return static_cast<const ImageManagerDriver *>
(MadManager::get(0,name,image_driver_name));
};
/**
* Function to execute the Manager action loop method within a new pthread
* (requires C linkage)
*/
friend void * image_action_loop(void *arg);
/**
* The action function executed when an action is triggered.
* @param action the name of the action
* @param arg arguments for the action function
*/
void do_action(const string& action, void * arg);
/**
* Acquires an image updating its state.
* @param image pointer to image, it should be locked
* @return 0 on success
*/
int acquire_image(Image *img, string& error);
/**
* Moves a file to an image in the repository
* @param image to be updated (it's source attribute)
* @param source path of the disk file
*/
void move_image(Image *img, const string& source);
/**
* Formats an XML message for the MAD
*
* @param img_data Image XML representation
* @param ds_data Datastore XML representation
* @return the XML message
*/
string * format_message(const string& img_data, const string& ds_data);
};
#endif /*IMAGE_MANAGER_H*/
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