mirror of
https://github.com/OpenNebula/one.git
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294 lines
8.4 KiB
C++
294 lines
8.4 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2013, 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 HOST_POOL_H_
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#define HOST_POOL_H_
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#include "PoolSQL.h"
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#include "Host.h"
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#include <time.h>
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#include <sstream>
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#include <iostream>
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#include <vector>
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using namespace std;
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/**
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* The Host Pool class.
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*/
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class HostPool : public PoolSQL
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{
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public:
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HostPool(SqlDB * db,
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vector<const Attribute *> hook_mads,
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const string& hook_location,
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const string& remotes_location,
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time_t expire_time);
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~HostPool(){};
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/**
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* Function to allocate a new Host object
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* @param oid the id assigned to the Host
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* @return the oid assigned to the object or -1 in case of failure
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*/
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int allocate (
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int * oid,
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const string& hostname,
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const string& im_mad_name,
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const string& vmm_mad_name,
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const string& vnm_mad_name,
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int cluster_id,
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const string& cluster_name,
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string& error_str);
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/**
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* Function to get a Host from the pool, if the object is not in memory
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* it is loaded from the DB
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* @param oid Host unique id
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* @param lock locks the Host mutex
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* @return a pointer to the Host, 0 if the Host could not be loaded
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*/
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Host * get(
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int oid,
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bool lock)
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{
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return static_cast<Host *>(PoolSQL::get(oid,lock));
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};
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/**
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* Function to get a Host from the pool, if the object is not in memory
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* it is loaded from the DB
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* @param hostname
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* @param lock locks the Host mutex
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* @return a pointer to the Host, 0 if the Host could not be loaded
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*/
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Host * get(string name, bool lock)
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{
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// The owner is set to -1, because it is not used in the key() method
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return static_cast<Host *>(PoolSQL::get(name,-1,lock));
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};
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/**
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* Generate an index key for the object
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* @param name of the object
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* @param uid owner of the object, only used if needed
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*
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* @return the key, a string
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*/
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string key(const string& name, int uid)
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{
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// Name is enough key because Hosts can't repeat names.
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return name;
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};
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/**
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* Bootstraps the database table(s) associated to the Host pool
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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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return Host::bootstrap(_db);
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};
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/**
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* Get the least monitored hosts
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* @param discovered hosts
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* @param host_limit max. number of hosts to monitor at a time
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* @param target_time Filters hosts with last_mon_time <= target_time
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* @return int 0 if success
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*/
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int discover(set<int> * discovered_hosts, int host_limit, time_t target_time);
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/**
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* Allocates a given capacity to the host
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* @param oid the id of the host to allocate the capacity
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* @param vm_id id of the vm to add to the host
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* @param cpu amount of CPU, in percentage
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* @param mem amount of main memory, in KB
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* @param disk amount of disk
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*/
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void add_capacity(int oid, int vm_id, int cpu, int mem, int disk)
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{
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Host * host = get(oid, true);
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if ( host != 0 )
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{
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host->add_capacity(vm_id, cpu, mem, disk);
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update(host);
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host->unlock();
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}
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};
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/**
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* De-Allocates a given capacity to the host
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* @param oid the id of the host to allocate the capacity
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* @param vm_id id of the vm to add to the host
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* @param cpu amount of CPU
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* @param mem amount of main memory
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* @param disk amount of disk
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*/
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void del_capacity(int oid, int vm_id, int cpu, int mem, int disk)
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{
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Host * host = get(oid, true);
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if ( host != 0 )
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{
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host->del_capacity(vm_id, cpu, mem, disk);
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update(host);
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host->unlock();
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}
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};
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int drop(PoolObjectSQL * objsql, string& error_msg)
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{
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Host * host = static_cast<Host *>(objsql);
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if ( host->get_share_running_vms() > 0 )
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{
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error_msg = "Can not remove a host with running VMs";
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return -1;
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}
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return PoolSQL::drop(objsql, error_msg);
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};
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/**
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* Dumps the HOST pool in XML format. A filter can be also added to the
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* query
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* @param oss the output stream to dump the pool contents
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* @param where filter for the objects, defaults to all
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*
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* @return 0 on success
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*/
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int dump(ostringstream& oss, const string& where)
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{
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return PoolSQL::dump(oss, "HOST_POOL", Host::table, where);
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};
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/**
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* Finds a set objects that satisfies a given condition
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* @param oids a vector with the oids of the objects.
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* @param the name of the DB table.
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* @param where condition in SQL format.
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*
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* @return 0 on success
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*/
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int search(vector<int>& oids, const string& where)
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{
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return PoolSQL::search(oids, Host::table, where);
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};
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/**
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* Dumps the host monitoring information entries in XML format. A filter
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* can be also added to the query.
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*
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* @param oss the output stream to dump the pool contents
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* @param where filter for the objects, defaults to all
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*
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* @return 0 on success
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*/
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int dump_monitoring(ostringstream& oss,
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const string& where);
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/**
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* Dumps the HOST monitoring information for a single HOST
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*
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* @param oss the output stream to dump the pool contents
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* @param hostid id of the target HOST
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*
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* @return 0 on success
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*/
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int dump_monitoring(ostringstream& oss,
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int hostid)
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{
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ostringstream filter;
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filter << "oid = " << hostid;
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return dump_monitoring(oss, filter.str());
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}
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/**
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* Inserts the last monitoring, and deletes old monitoring entries for this
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* host
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*
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* @param host pointer to the host object
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* @return 0 on success
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*/
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int update_monitoring(Host * host)
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{
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if ( _monitor_expiration <= 0 )
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{
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return 0;
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}
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return host->update_monitoring(db);
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};
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/**
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* Deletes the expired monitoring entries for all hosts
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*
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* @return 0 on success
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*/
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int clean_expired_monitoring();
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private:
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/**
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* Factory method to produce Host objects
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* @return a pointer to the new Host
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*/
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PoolObjectSQL * create()
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{
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return new Host(-1,"","","","",-1,"");
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};
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/**
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* Callback function to get the IDs of the hosts to be monitored
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* (Host::discover)
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*
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* @param _set the set<int>* of host ids
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* @param num the number of columns read from the DB
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* @param values the column values
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* @param names the column names
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*
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* @return 0 on success
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*/
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int discover_cb(void * _set, int num, char **values, char **names);
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/**
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* Deletes all monitoring entries for all hosts
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*
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* @return 0 on success
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*/
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int clean_all_monitoring();
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/**
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* Size, in seconds, of the historical monitoring information
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*/
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static time_t _monitor_expiration;
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};
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#endif /*HOST_POOL_H_*/
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