mirror of
https://github.com/OpenNebula/one.git
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299 lines
8.3 KiB
C++
299 lines
8.3 KiB
C++
/* ------------------------------------------------------------------------ */
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/* Copyright 2002-2012, OpenNebula Project Leads (OpenNebula.org) */
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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 CLUSTER_H_
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#define CLUSTER_H_
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#include "PoolSQL.h"
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#include "ObjectCollection.h"
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#include "DatastorePool.h"
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#include "ClusterTemplate.h"
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using namespace std;
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/**
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* The Cluster class.
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*/
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class Cluster : public PoolObjectSQL
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{
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public:
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/**
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* Returns the SYSTEM_DS attribute, or the system DS id if it is not defined
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*
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* @return the SYSTEM_DS attribute, or the system DS id if it is not defined
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*/
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int get_ds_id()
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{
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int ds_id;
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if ( obj_template->get("SYSTEM_DS", ds_id) == false )
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{
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ds_id = DatastorePool::SYSTEM_DS_ID;
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}
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return ds_id;
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}
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/**
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* Returns the DATASTORE_LOCATION for the hosts of the cluster. If not
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* defined that in oned.conf is returned.
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*
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* @param ds_location string to copy the DATASTORE_LOCATION to
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* @return DATASTORE_LOCATION
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*/
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string& get_ds_location(string &ds_location);
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// *************************************************************************
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// Object Collections (Public)
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// *************************************************************************
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/**
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* Adds this host ID to the set.
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* @param id to be added to the cluster
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* @param error_msg Error message, if any
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* @return 0 on success
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*/
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int add_host(int id, string& error_msg)
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{
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int rc = hosts.add_collection_id(id);
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if ( rc < 0 )
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{
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error_msg = "Host ID is already in the cluster set.";
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}
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return rc;
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}
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/**
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* Deletes this host ID from the set.
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* @param id to be deleted from the cluster
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* @param error_msg Error message, if any
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* @return 0 on success
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*/
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int del_host(int id, string& error_msg)
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{
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int rc = hosts.del_collection_id(id);
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if ( rc < 0 )
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{
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error_msg = "Host ID is not part of the cluster set.";
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}
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return rc;
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}
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/**
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* Adds this datastore ID to the set.
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* @param id to be added to the cluster
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* @param error_msg Error message, if any
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* @return 0 on success
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*/
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int add_datastore(int id, string& error_msg)
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{
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// TODO: should fail for any system DS?
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if ( id == DatastorePool::SYSTEM_DS_ID )
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{
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ostringstream oss;
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oss << "Datastore '"<< DatastorePool::SYSTEM_DS_NAME
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<< "' cannot be added to any cluster.";
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error_msg = oss.str();
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return -1;
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}
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int rc = datastores.add_collection_id(id);
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if ( rc < 0 )
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{
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error_msg = "Datastore ID is already in the cluster set.";
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}
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return rc;
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}
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/**
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* Deletes this datastore ID from the set.
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* @param id to be deleted from the cluster
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* @param error_msg Error message, if any
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* @return 0 on success
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*/
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int del_datastore(int id, string& error_msg)
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{
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int rc = datastores.del_collection_id(id);
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if ( rc < 0 )
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{
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error_msg = "Datastore ID is not part of the cluster set.";
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}
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return rc;
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}
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/**
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* Adds this vnet ID to the set.
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* @param id to be added to the cluster
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* @param error_msg Error message, if any
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* @return 0 on success
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*/
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int add_vnet(int id, string& error_msg)
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{
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int rc = vnets.add_collection_id(id);
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if ( rc < 0 )
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{
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error_msg = "Network ID is already in the cluster set.";
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}
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return rc;
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}
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/**
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* Deletes this vnet ID from the set.
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* @param id to be deleted from the cluster
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* @param error_msg Error message, if any
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* @return 0 on success
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*/
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int del_vnet(int id, string& error_msg)
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{
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int rc = vnets.del_collection_id(id);
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if ( rc < 0 )
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{
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error_msg = "Network ID is not part of the cluster set.";
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}
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return rc;
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}
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// *************************************************************************
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// DataBase implementation (Public)
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// *************************************************************************
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/**
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* Function to print the Cluster object into a string in XML format
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* @param xml the resulting XML string
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* @return a reference to the generated string
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*/
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string& to_xml(string& xml) const;
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/**
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* Rebuilds the object from an xml formatted string
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* @param xml_str The xml-formatted string
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*
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* @return 0 on success, -1 otherwise
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*/
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int from_xml(const string &xml_str);
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private:
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// -------------------------------------------------------------------------
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// Friends
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// -------------------------------------------------------------------------
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friend class ClusterPool;
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// *************************************************************************
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// Constructor
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// *************************************************************************
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Cluster(int id,
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const string& name,
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ClusterTemplate* cl_template);
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virtual ~Cluster(){};
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// *************************************************************************
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// Object Collections (Private)
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// *************************************************************************
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ObjectCollection hosts;
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ObjectCollection datastores;
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ObjectCollection vnets;
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// *************************************************************************
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// DataBase implementation (Private)
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// *************************************************************************
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static const char * db_names;
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static const char * db_bootstrap;
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static const char * table;
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/**
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* Execute an INSERT or REPLACE Sql query.
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* @param db The SQL DB
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* @param replace Execute an INSERT or a REPLACE
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* @param error_str Returns the error reason, if any
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* @return 0 one success
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*/
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int insert_replace(SqlDB *db, bool replace, string& error_str);
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/**
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* Bootstraps the database table(s) associated to the Cluster
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* @return 0 on success
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*/
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static int bootstrap(SqlDB * db)
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{
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ostringstream oss(Cluster::db_bootstrap);
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return db->exec(oss);
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};
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/**
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* Writes the Cluster in the database.
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* @param db pointer to the db
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* @return 0 on success
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*/
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int insert(SqlDB *db, string& error_str)
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{
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return insert_replace(db, false, error_str);
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}
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/**
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* Writes/updates the Cluster's data fields in the database.
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* @param db pointer to the db
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* @return 0 on success
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*/
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int update(SqlDB *db)
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{
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string error_str;
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return insert_replace(db, true, error_str);
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}
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/**
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* Checks if all the collections are empty, and therefore this cluster
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* can be dropped.
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*
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* @param error_msg Error message, if any.
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* @return 0 if cluster can be dropped, -1 otherwise
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*/
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int check_drop(string& error_msg);
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/**
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* Factory method for cluster templates
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*/
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Template * get_new_template() const
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{
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return new ClusterTemplate;
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}
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};
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#endif /*CLUSTER_H_*/
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