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one/include/VMGroupRule.h
2021-02-09 16:07:56 +01:00

188 lines
5.5 KiB
C++

/* ------------------------------------------------------------------------ */
/* Copyright 2002-2021, OpenNebula Project, OpenNebula Systems */
/* */
/* 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 VMGROUP_RULE_H_
#define VMGROUP_RULE_H_
#include <bitset>
#include "VMGroupRole.h"
struct VMGroupRule_compare;
/**
* Placement policy rules for roles
* AFFINED: VMs of all roles are placed in the same hypervisor
* ANTI_AFFINED: VMs are placed in different hypervisors (role-wise)
* NONE: No additional placement constraints
*/
enum class VMGroupPolicy
{
NONE = 0x00,
AFFINED = 0x01,
ANTI_AFFINED= 0x02
};
std::ostream& operator<<(std::ostream& os, VMGroupPolicy policy);
/**
* A rule represents a role placement policy
*/
class VMGroupRule
{
public:
/**
* A specialized set for rules
*/
typedef std::set<VMGroupRule, VMGroupRule_compare> rule_set;
typedef std::bitset<VMGroupRoles::MAX_ROLES> role_bitset;
/* ---------------------------------------------------------------------- */
/* Rule Constructors */
/* ---------------------------------------------------------------------- */
VMGroupRule():policy(VMGroupPolicy::NONE),roles(){};
VMGroupRule(VMGroupPolicy p, std::set<int> roles_id):policy(p)
{
for ( auto rid : roles_id )
{
if ( rid < VMGroupRoles::MAX_ROLES )
{
roles[rid] = 1;
}
}
};
VMGroupRule(VMGroupPolicy p, role_bitset _roles):policy(p), roles(_roles){};
VMGroupRule(const VMGroupRule& other)
{
policy = other.policy;
roles = other.roles;
}
/* ---------------------------------------------------------------------- */
/* Rule operators */
/* ---------------------------------------------------------------------- */
VMGroupRule& operator=(const VMGroupRule& other)
{
if ( this != &other )
{
policy = other.policy;
roles = other.roles;
}
return *this;
}
VMGroupRule& operator&= (const VMGroupRule& other)
{
roles &= other.roles;
return *this;
}
VMGroupRule operator& (const VMGroupRule& other) const
{
return VMGroupRule(policy, other.roles & roles );
}
VMGroupRule& operator|= (const VMGroupRule& other)
{
roles |= other.roles;
return *this;
}
VMGroupRule operator| (const VMGroupRule& other) const
{
return VMGroupRule(policy, other.roles | roles );
}
bool none()
{
return roles.none();
}
/* ---------------------------------------------------------------------- */
/* Rule interface */
/* ---------------------------------------------------------------------- */
/**
* Check if an affined and anti-affined rule set are compatible. Sets are
* compatible if there isn't a role in the affined and anti-affined sets
* at the same time
* @param affined rule set
* @param anti affined rule set
* @param err a rule with the roles in both sets
*
* @return true if sets are compatible
*/
static bool compatible(rule_set& affined, rule_set& anti, VMGroupRule& err);
/**
* Reduce a set of affinity rules merging rules affecting the same roles
* Example:
* AFFINED = a, b
* AFFINED = b, c -------> AFFINED = a, b, c
* AFFINED = e, d AFFINED = e, d
*
* @param affined set of rules to be reduced
* @param reduced set
*/
static void reduce(rule_set affined, rule_set& reduced);
/**
* @return the roles in the rule as a bitset (1 roles is in)
*/
const role_bitset& get_roles() const
{
return roles;
}
VMGroupPolicy get_policy() const
{
return policy;
}
private:
friend class VMGroupRule_compare;
/**
* Type of the rule
*/
VMGroupPolicy policy;
/**
* Roles participating in the rule
*/
std::bitset<VMGroupRoles::MAX_ROLES> roles;
};
/**
* Functor to compre two rules. Two rules are considered equivalent if the
* include the same roles.
*/
struct VMGroupRule_compare
{
bool operator() (const VMGroupRule& lhs, const VMGroupRule& rhs) const
{
return lhs.roles.to_ullong() < rhs.roles.to_ullong();
}
};
#endif /*VMGROUP_RULE_H_*/