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142 lines
4.5 KiB
C++
142 lines
4.5 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2009, Distributed Systems Architecture Group, Universidad */
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/* Complutense de Madrid (dsa-research.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 SCHEDULER_HOST_H_
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#define SCHEDULER_HOST_H_
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#include "Host.h"
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using namespace std;
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/* -------------------------------------------------------------------------- */
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/* -------------------------------------------------------------------------- */
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/**
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* The SchedulerHost class. It represents the scheduler version of the host,
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* only read operations to the pool are allowed for the SchedulerHost class
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*/
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class SchedulerHost : public Host
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{
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public:
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SchedulerHost(){};
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~SchedulerHost(){};
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/**
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* Gets the current host capacity
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* @param cpu the host free cpu, scaled according to a given threshold
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* @param memory the host free memory
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* @param threshold to consider the host totally free
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*/
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void get_capacity(int& cpu, int& memory, int threshold);
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private:
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// ----------------------------------------
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// Friends
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// ----------------------------------------
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friend class SchedulerHostPool;
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// ----------------------------------------
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// SQL functions do not modify the DB!
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// ----------------------------------------
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int insert(SqliteDB *db);
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int update(SqliteDB *db);
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int drop(SqliteDB *db);
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};
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/* -------------------------------------------------------------------------- */
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/* -------------------------------------------------------------------------- */
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/**
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* The SchedulerHost class. It represents the scheduler version of the host,
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* read only operation to the pool are allowed for the SchedulerHost class
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*/
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class SchedulerHostPool : public PoolSQL
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{
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public:
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//--------------------------------------------------------------------------
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// Constructor
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//--------------------------------------------------------------------------
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SchedulerHostPool(SqliteDB *db):PoolSQL(db){};
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~SchedulerHostPool(){};
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/**
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* Implements the Pool interface, just prints an error message. This
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* class DOES NOT modify the database.
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*/
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int allocate(
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PoolObjectSQL *objsql);
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/**
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* Gets an ScheulerHost from the pool (if needed the object is loaded from
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* the database).
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* @param oid the object unique identifier
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* @param lock locks the object if true
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*
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* @return a pointer to the object, 0 in case of failure
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*/
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SchedulerHost * get(
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int oid,
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bool lock)
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{
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return static_cast<SchedulerHost *>(PoolSQL::get(oid,lock));
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};
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/**
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* Set ups the host pool by performing the following actions:
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* - All the objects stored in the pool are flushed
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* - The ids of the hosts in the database are loaded
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* @return 0 on success
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*/
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int set_up();
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private:
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friend class Scheduler;
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/**
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* Hosts ids
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*/
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vector<int> hids;
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/**
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* Factory method for the PoolSQL class
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* @return a pointer to a new SchedulerHost object
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*/
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PoolObjectSQL * create()
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{
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return new SchedulerHost;
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};
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/**
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* Bootstrap method from the PoolSQL interface. It just prints
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* an error message as this class MUST not modify the DB.
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*/
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void bootstrap();
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};
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#endif /*SCHEDULER_HOST_H_*/
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