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LoadBalance.cpp
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LoadBalance.cpp
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////////////////////////////////////////////////////////////////////////////////
/// @file LoadBalance.cpp
///
/// @author Ravi Akella <rcaq5c@mst.edu>
/// @author Thomas Roth <tprfh7@mst.edu>
///
/// @project FREEDM DGI
///
/// @description A distributed load balance algorithm for power management.
///
/// @citations Ni, Lionel M., Chong-Wei Xu, and Thomas B. Gendreau.
/// A distributed drafting algorithm for load balancing.
/// Software Engineering, IEEE Transactions on 10 (1985)
///
/// @functions LBAgent::LBAgent
/// LBAgent::Run
/// LBAgent::MoveToPeerSet
/// LBAgent::SendToPeerSet
/// LBAgent::FirstRound
/// LBAgent::LoadManage
/// LBAgent::ScheduleNextRound
/// LBAgent::ReadDevices
/// LBAgent::UpdateState
/// LBAgent::LoadTable
/// LBAgent::SendStateChange
/// LBAgent::HandleStateChange
/// LBAgent::SendDraftRequest
/// LBAgent::HandleDraftRequest
/// LBAgent::SendDraftAge
/// LBAgent::HandleDraftAge
/// LBAgent::DraftStandard
/// LBAgent::SendDraftSelect
/// LBAgent::HandleDraftSelect
/// LBAgent::SendDraftAccept
/// LBAgent::SendTooLate
/// LBAgent::HandleDraftAccept
/// LBAgent::HandleTooLate
/// LBAgent::HandlePeerList
/// LBAgent::SetPStar
/// LBAgent::PrepareForSending
/// LBAgent::Synchronize
/// LBAgent::CheckInvariant
///
/// These source code files were created at Missouri University of Science and
/// Technology, and are intended for use in teaching or research. They may be
/// freely copied, modified, and redistributed as long as modified versions are
/// clearly marked as such and this notice is not removed. Neither the authors
/// nor Missouri S&T make any warranty, express or implied, nor assume any legal
/// responsibility for the accuracy, completeness, or usefulness of these files
/// or any information distributed with these files.
///
/// Suggested modifications or questions about these files can be directed to
/// Dr. Bruce McMillin, Department of Computer Science, Missouri University of
/// Science and Technology, Rolla, MO 65409 <ff@mst.edu>.
////////////////////////////////////////////////////////////////////////////////
#include "LoadBalance.hpp"
#include "CLogger.hpp"
#include "Messages.hpp"
#include "CTimings.hpp"
#include "CDeviceManager.hpp"
#include "CGlobalPeerList.hpp"
#include "gm/GroupManagement.hpp"
#include "CGlobalConfiguration.hpp"
#include <sstream>
#include <boost/foreach.hpp>
#include <boost/bind.hpp>
#include <boost/asio/error.hpp>
#include <boost/system/error_code.hpp>
#include <boost/range/adaptor/map.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
namespace freedm {
namespace broker {
namespace lb {
namespace {
CLocalLogger Logger(__FILE__);
}
///////////////////////////////////////////////////////////////////////////////
/// LBAgent
/// @description: Constructor for the load balancing module
/// @pre: Posix Main should register read handler and invoke this module
/// @post: Object is initialized and ready to run load balancing
/// @limitations: None
///////////////////////////////////////////////////////////////////////////////
LBAgent::LBAgent()
: ROUND_TIME(boost::posix_time::milliseconds(CTimings::LB_ROUND_TIME))
, REQUEST_TIMEOUT(boost::posix_time::milliseconds(CTimings::LB_REQUEST_TIMEOUT))
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
m_RoundTimer = CBroker::Instance().AllocateTimer("lb");
m_WaitTimer = CBroker::Instance().AllocateTimer("lb");
m_State = LBAgent::NORMAL;
m_Leader = GetUUID();
m_invariant = false;
m_PowerDifferential = 0;
m_MigrationStep = CGlobalConfiguration::Instance().GetMigrationStep();
}
////////////////////////////////////////////////////////////
/// Run
/// @description Main function which initiates the algorithm
/// @pre: Posix Main should invoke this function
/// @post: Triggers the drafting algorithm by calling LoadManage()
/// @limitations None
/////////////////////////////////////////////////////////
int LBAgent::Run()
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
CBroker::Instance().Schedule(m_RoundTimer, boost::posix_time::not_a_date_time,
boost::bind(&LBAgent::FirstRound, this, boost::asio::placeholders::error));
Logger.Info << "LoadManage scheduled for the next phase." << std::endl;
return 0;
}
///////////////////////////////////////////////////////////////////////////////
/// HandleIncomingMessage
/// "Downcasts" incoming messages into a specific message type, and passes the
/// message to an appropriate handler.
/// @pre None
/// @post The message is handled by the target handler or a warning is
/// produced.
/// @param m the incoming message
/// @param peer the node that sent this message (could be this DGI)
///////////////////////////////////////////////////////////////////////////////
void LBAgent::HandleIncomingMessage(boost::shared_ptr<const ModuleMessage> m, CPeerNode peer)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(m->has_group_management_message())
{
gm::GroupManagementMessage gmm = m->group_management_message();
if(gmm.has_peer_list_message())
{
HandlePeerList(gmm.peer_list_message(), peer);
}
else
{
Logger.Warn << "Dropped unexpected group management message:\n" << m->DebugString();
}
}
else if(m->has_state_collection_message())
{
sc::StateCollectionMessage scm = m->state_collection_message();
if(scm.has_collected_state_message())
{
Logger.Debug << "Collected State: " << m->DebugString();
HandleCollectedState(scm.collected_state_message());
}
else
{
Logger.Warn << "Dropped unexpected group management message:\n" << m->DebugString();
}
}
else if(m->has_load_balancing_message())
{
LoadBalancingMessage lbm = m->load_balancing_message();
if(lbm.has_state_change_message())
{
HandleStateChange(lbm.state_change_message(), peer);
}
else if(lbm.has_draft_request_message())
{
HandleDraftRequest(lbm.draft_request_message(), peer);
}
else if(lbm.has_draft_age_message())
{
HandleDraftAge(lbm.draft_age_message(), peer);
}
else if(lbm.has_draft_select_message())
{
HandleDraftSelect(lbm.draft_select_message(), peer);
}
else if(lbm.has_draft_accept_message())
{
HandleDraftAccept(lbm.draft_accept_message(), peer);
}
else if(lbm.has_too_late_message())
{
HandleTooLate(lbm.too_late_message());
}
else if(lbm.has_collected_state_message())
{
HandleCollectedState(lbm.collected_state_message());
}
else
{
Logger.Warn << "Dropped unexpected load balance message:\n" << m->DebugString();
}
}
else
{
Logger.Warn << "Dropped message of unexpected type:\n" << m->DebugString();
}
}
///////////////////////////////////////////////////////////////////////////////
/// MoveToPeerSet
/// Moves the given peer to the given peerset, removing it from all other
/// categorized peersets (Normal, Supply Demand).
/// @pre None
/// @post Peer is removed from all specialized peersets, and then readded to ps.
/// @param ps The peerset to move the peer to.
/// @param peer the peer to move.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::MoveToPeerSet(PeerSet & ps, CPeerNode peer)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
EraseInPeerSet(m_InSupply, peer);
EraseInPeerSet(m_InDemand, peer);
EraseInPeerSet(m_InNormal, peer);
InsertInPeerSet(ps, peer);
}
///////////////////////////////////////////////////////////////////////////////
/// SendToPeerSet
/// @description Given a message m, send it to every process in peerSet
/// @pre None
/// @post m is sent to all processes in peerSet
/// @peers peerSet
/// @param m The message to send
/// @param ps the processes to send the message to.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::SendToPeerSet(const PeerSet & ps, const ModuleMessage & m)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
Logger.Info << "Sending " << m.DebugString() << std::endl;
BOOST_FOREACH(CPeerNode peer, ps | boost::adaptors::map_values)
{
try
{
peer.Send(m);
}
catch(boost::system::system_error & error)
{
Logger.Warn << "Couldn't send message to peer";
}
}
}
///////////////////////////////////////////////////////////////////////////////
/// FirstRound
/// @description The code that is executed as part of the first loadbalance
/// each round.
/// @pre None
/// @post if the timer wasn't cancelled this function requests state collection
/// and calls the first load balance.
/// @param error The reason this function was called.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::FirstRound(const boost::system::error_code & error)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(!error)
{
m_Synchronized = false;
ScheduleStateCollection();
CBroker::Instance().Schedule("lb",
boost::bind(&LBAgent::LoadManage, this, boost::system::error_code()));
}
else if(error == boost::asio::error::operation_aborted)
{
Logger.Notice << "Load Manage Aborted" << std::endl;
}
else
{
Logger.Error << error << std::endl;
throw boost::system::system_error(error);
}
}
////////////////////////////////////////////////////////////
/// LoadManage
/// @description: Manages the execution of the load balancing algorithm by
/// broadcasting load changes and initiating SendDraftRequest()
/// if in Supply
/// @pre: Node is not in Fail state
/// @post: Load state change is monitored, specific load changes are
/// advertised to peers and restarts on timeout
/// @peers All peers in case of Demand state and transition to Normal from
/// Demand;
/// @limitations
/////////////////////////////////////////////////////////
void LBAgent::LoadManage(const boost::system::error_code & error)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(!error)
{
ScheduleNextRound();
ReadDevices();
UpdateState();
LoadTable();
std::set<device::CDevice::Pointer> logger;
logger = device::CDeviceManager::Instance().GetDevicesOfType("Logger");
if(logger.empty() || (*logger.begin())->GetState("dgiEnable") == 1)
{
if(m_State == LBAgent::DEMAND)
{
SendToPeerSet(m_AllPeers, MessageStateChange("demand"));
Logger.Notice << "Sending state change, DEMAND" << std::endl;
}
if(m_Synchronized)
{
SendDraftRequest();
}
else
{
Logger.Notice << "Draft Request Cancelled: state too old" << std::endl;
}
}
else
{
SetPStar(m_Gateway);
}
}
else if(error == boost::asio::error::operation_aborted)
{
Logger.Notice << "Load Manage Aborted" << std::endl;
}
else
{
Logger.Error << error << std::endl;
throw boost::system::system_error(error);
}
}
///////////////////////////////////////////////////////////////////////////////
/// ScheduleNextRound
/// @description Computes how much time is remaining and if there isn't enough
/// requests the loadbalance that will run next round.
/// @pre None
/// @post LoadManage is scheduled for this round OR FirstRound is scheduled
/// for next time.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::ScheduleNextRound()
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(CBroker::Instance().TimeRemaining() > ROUND_TIME + ROUND_TIME)
{
CBroker::Instance().Schedule(m_RoundTimer, ROUND_TIME,
boost::bind(&LBAgent::LoadManage, this, boost::asio::placeholders::error));
Logger.Info << "LoadManage scheduled in " << ROUND_TIME << " ms." << std::endl;
}
else
{
CBroker::Instance().Schedule(m_RoundTimer, boost::posix_time::not_a_date_time,
boost::bind(&LBAgent::FirstRound, this, boost::asio::placeholders::error));
Logger.Info << "LoadManage scheduled for the next phase." << std::endl;
}
}
///////////////////////////////////////////////////////////////////////////////
/// ReadDevices
/// @description Reads the device state and updates the appropriate member vars.
/// @pre None
/// @post m_gateway and m_netgeneration are updated.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::ReadDevices()
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
float generation = device::CDeviceManager::Instance().GetNetValue("Drer", "generation");
float storage = device::CDeviceManager::Instance().GetNetValue("Desd", "storage");
float load = device::CDeviceManager::Instance().GetNetValue("Load", "drain");
m_Gateway = device::CDeviceManager::Instance().GetNetValue("Sst", "gateway");
m_NetGeneration = generation + storage - load;
}
///////////////////////////////////////////////////////////////////////////////
/// UpdateState
/// @description Determines the state of this node with respect to Supply,
/// Demand, Normal.
/// @pre The values used such as the gateway and migration step are valid and
/// up to date.
/// @post This node may change state.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::UpdateState()
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
int sstCount = device::CDeviceManager::Instance().GetDevicesOfType("Sst").size();
Logger.Debug << "Recognize " << sstCount << " attached SST devices." << std::endl;
if(sstCount > 0 && m_NetGeneration >= m_Gateway + m_MigrationStep)
{
if(m_State != LBAgent::SUPPLY)
{
m_State = LBAgent::SUPPLY;
Logger.Info << "Changed to SUPPLY state." << std::endl;
}
}
else if(sstCount > 0 && m_NetGeneration <= m_Gateway - m_MigrationStep)
{
if(m_State != LBAgent::DEMAND)
{
m_State = LBAgent::DEMAND;
Logger.Info << "Changed to DEMAND state." << std::endl;
}
}
else
{
if(m_State != LBAgent::NORMAL)
{
m_State = LBAgent::NORMAL;
Logger.Info << "Changed to NORMAL state." << std::endl;
}
}
}
////////////////////////////////////////////////////////////
/// LoadTable
/// @description Prints the load table: A tool for observing the state of the system.
/// @pre None
/// @post None
/// @limitations Some entries in Load table could become stale relative to the
/// global state. The definition of Supply/Normal/Demand could
/// change in future
/////////////////////////////////////////////////////////
void LBAgent::LoadTable()
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
int drer_count = device::CDeviceManager::Instance().GetDevicesOfType("Drer").size();
int desd_count = device::CDeviceManager::Instance().GetDevicesOfType("Desd").size();
int load_count = device::CDeviceManager::Instance().GetDevicesOfType("Load").size();
float generation = device::CDeviceManager::Instance().GetNetValue("Drer", "generation");
float storage = device::CDeviceManager::Instance().GetNetValue("Desd", "storage");
float load = device::CDeviceManager::Instance().GetNetValue("Load", "drain");
std::stringstream loadtable;
loadtable << std::setprecision(2) << std::fixed;
loadtable << "------- LOAD TABLE (Power Management) -------" << std::endl;
loadtable << "\tNet DRER (" << std::setfill('0') << std::setw(2) << drer_count
<< "): " << generation << std::endl;
loadtable << "\tNet DESD (" << std::setfill('0') << std::setw(2) << desd_count
<< "): " << storage << std::endl;
loadtable << "\tNet Load (" << std::setfill('0') << std::setw(2) << load_count
<< "): " << load << std::endl;
loadtable << "\t---------------------------------------------" << std::endl;
loadtable << "\tSST Gateway: " << m_Gateway << std::endl;
loadtable << "\tNet Generation: " << m_NetGeneration << std::endl;
loadtable << "\tInvariant: " << (m_invariant ? "TRUE" : "FALSE") << std::endl;
// loadtable << "\tPredicted K: " << m_PowerDifferential << std::endl;
loadtable << "\t---------------------------------------------" << std::endl;
if(m_State == LBAgent::DEMAND)
{
loadtable << "\t(DEMAND) " << GetUUID() << std::endl;
}
else if(m_State == LBAgent::SUPPLY)
{
loadtable << "\t(SUPPLY) " << GetUUID() << std::endl;
}
else
{
loadtable << "\t(NORMAL) " << GetUUID() << std::endl;
}
BOOST_FOREACH(CPeerNode peer, m_AllPeers | boost::adaptors::map_values)
{
if(CountInPeerSet(m_InDemand, peer) > 0)
{
loadtable << "\t(DEMAND) " << peer.GetUUID() << std::endl;
}
else if(CountInPeerSet(m_InNormal, peer) > 0)
{
loadtable << "\t(NORMAL) " << peer.GetUUID() << std::endl;
}
else if(CountInPeerSet(m_InSupply, peer) > 0)
{
loadtable << "\t(SUPPLY) " << peer.GetUUID() << std::endl;
}
else
{
loadtable << "\t( ???? ) " << peer.GetUUID() << std::endl;
}
}
loadtable << "\t---------------------------------------------";
Logger.Status << loadtable.str() << std::endl;
}
///////////////////////////////////////////////////////////////////////////////
/// MessageStateChange
/// @description Generates a state change message
/// @pre None
/// @post Returns the new message.
/// @param state is a string describing the new state of Load Balancing
///////////////////////////////////////////////////////////////////////////////
ModuleMessage LBAgent::MessageStateChange(std::string state)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
LoadBalancingMessage msg;
StateChangeMessage * submsg = msg.mutable_state_change_message();
submsg->set_state(state);
return PrepareForSending(msg);
}
///////////////////////////////////////////////////////////////////////////////
/// HandleStateChange
/// @description Handles a peer announcing it is in a new state
/// @pre The state message is fully populated. The peer is valid.
/// @post The peer is removed from any state sets it is currently in and placed
/// in a set by the contents of the message.
/// @param m The message body that was recieved by this process.
/// @param peer The process that the message orginated from.
/// @peers A Group member.
/// @limitations Does not validate the source, integrity or contents of the
/// message.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::HandleStateChange(const StateChangeMessage & m, CPeerNode peer)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(CountInPeerSet(m_AllPeers, peer) == 0)
{
Logger.Warn << "State from unknown peer: " << peer.GetUUID() << std::endl;
}
else
{
std::string state = m.state();
Logger.Info << "Received " << state << " state from " << peer.GetUUID() << std::endl;
if(state == "supply")
{
MoveToPeerSet(m_InSupply, peer);
}
else if(state == "demand")
{
MoveToPeerSet(m_InDemand, peer);
}
else if(state == "normal")
{
MoveToPeerSet(m_InNormal, peer);
}
else
{
Logger.Warn << "Bad state from peer: " << peer.GetUUID() << std::endl;
}
}
}
///////////////////////////////////////////////////////////////////////////////
/// MessageDraftRequest
/// @pre None
/// @post A new message is generated
/// @description Creates a new DraftRequest message.
///////////////////////////////////////////////////////////////////////////////
ModuleMessage LBAgent::MessageDraftRequest()
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
LoadBalancingMessage msg;
msg.mutable_draft_request_message();
return PrepareForSending(msg);
}
////////////////////////////////////////////////////////////
/// SendDraftRequest
/// @description Advertise willingness to share load whenever you can supply
/// @pre: Current load state of this node is 'Supply'
/// @post: Send DraftRequest message to peers in demand state
/////////////////////////////////////////////////////////
void LBAgent::SendDraftRequest()
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(m_State != LBAgent::SUPPLY)
{
Logger.Notice << "Draft Request Cancelled: not in SUPPLY" << std::endl;
}
else if(m_InDemand.empty())
{
Logger.Notice << "Draft Request Cancelled: no DEMAND" << std::endl;
}
else if(CGlobalConfiguration::Instance().GetInvariantCheck() && !m_invariant)
{
Logger.Notice << "Draft Request Cancelled: invariant false" << std::endl;
}
else
{
SendToPeerSet(m_InDemand, MessageDraftRequest());
CBroker::Instance().Schedule(m_WaitTimer, REQUEST_TIMEOUT,
boost::bind(&LBAgent::DraftStandard, this, boost::asio::placeholders::error));
m_DraftAge.clear();
Logger.Info << "Sent Draft Request" << std::endl;
}
}
///////////////////////////////////////////////////////////////////////////////
/// HandleDraftRequest
/// @description Handler for a DraftRequest message. A request message is sent by
/// a supply node to see if a demand node wants to perform a
/// migration.
/// @pre The message is fully populated. The peer is valid.
/// @post If this process is in the demand state, a DraftAge message is sent back
/// to the orginating process.
/// @param m The message body that was recieved by this process.
/// @param peer The process that the message orginated from.
/// @peers A group member who was in the supply state.
/// @limitations Does not validate the source, integrity or contents of the
/// message.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::HandleDraftRequest(const DraftRequestMessage & /*m*/, CPeerNode peer)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
Logger.Info << "Draft Request from " << peer.GetUUID() << std::endl;
if(CountInPeerSet(m_AllPeers, peer) == 0)
{
Logger.Notice << "Rejected Draft Request: unknown peer" << std::endl;
}
else
{
MoveToPeerSet(m_InSupply, peer);
SendDraftAge(peer);
}
}
///////////////////////////////////////////////////////////////////////////////
/// MessageDraftAge
/// @pre None
/// @post A new message is generated
/// @description Creates a new DraftAge message.
///////////////////////////////////////////////////////////////////////////////
ModuleMessage LBAgent::MessageDraftAge(float age)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
LoadBalancingMessage msg;
DraftAgeMessage * submsg = msg.mutable_draft_age_message();
submsg->set_draft_age(age);
return PrepareForSending(msg);
}
///////////////////////////////////////////////////////////////////////////////
/// SendDraftAge
/// @description Sends a DraftAge message to specified peer announcing how
/// much demand this node has.
/// @param peer The process to send this to.
/// @pre None
/// @post Sends a DraftAge message if this process was in the demand state.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::SendDraftAge(CPeerNode peer)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
float age = 0;
if(m_State == LBAgent::DEMAND)
{
age = m_Gateway - m_NetGeneration;
}
Logger.Info << "Calculated Draft Age: " << age << std::endl;
try
{
peer.Send(MessageDraftAge(age));
Logger.Notice << "Sent Draft Age to " << peer.GetUUID() << std::endl;
}
catch(boost::system::system_error & e)
{
Logger.Warn << "Couldn't connect to peer" << std::endl;
}
}
///////////////////////////////////////////////////////////////////////////////
/// HandleDraftAge
/// @description A DraftAge message is sent by the demand node to a supply
/// to indicate it is still in a demand state and would like to migrate.
/// After the message is recieved this node will respond with drafting to
/// instruct the demand node to commit a power change.
/// @pre The message and peer are valid. This node should have sent a draft
/// request message to peer previously.
/// @post If in supply and the demand node is selected, a drafting message
/// will be sent to the demand node.
/// @param m The message body that was recieved by this process.
/// @param peer The process that the message orginated from.
/// @peers A demand node in the group.
/// @limitations Does not validate the source, integrity or contents of the
/// message.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::HandleDraftAge(const DraftAgeMessage & m, CPeerNode peer)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(CountInPeerSet(m_AllPeers, peer) == 0)
{
Logger.Notice << "Rejected Draft Age: unknown peer" << std::endl;
}
else
{
m_DraftAge[peer.GetUUID()] = m.draft_age();
Logger.Info << "Received draft age from " << peer.GetUUID() << std::endl;
}
}
///////////////////////////////////////////////////////////////////////////////
/// DraftStandard
/// @description This function is used to select the process(es) that the
/// migration will happen with. The demand nodes send DraftAge messages
/// indicating the amount of demand to fill.
/// @pre DraftRequests were sent to the nodes whose replies will be processed
/// @post DraftSelect messages are sent to the selected demand nodes.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::DraftStandard(const boost::system::error_code & error)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(!error)
{
std::map<std::string, float>::iterator it;
CPeerNode selected_peer;
float selected_age = 0;
for(it = m_DraftAge.begin(); it != m_DraftAge.end(); it++)
{
PeerSet::iterator psit = m_AllPeers.find(it->first);
if(psit == m_AllPeers.end())
{
Logger.Info << "Skipped unknown peer: " << it->first << std::endl;
continue;
}
CPeerNode peer = psit->second;
float age = it->second;
if(age == 0.0)
{
MoveToPeerSet(m_InNormal, peer);
}
else if(age > selected_age)
{
selected_age = age;
selected_peer = peer;
}
}
if(selected_age >= m_MigrationStep && m_State == LBAgent::SUPPLY)
{
SendDraftSelect(selected_peer, m_MigrationStep);
}
}
else if(error == boost::asio::error::operation_aborted)
{
Logger.Notice << "Draft Standard Aborted" << std::endl;
}
else
{
Logger.Error << error << std::endl;
throw boost::system::system_error(error);
}
}
///////////////////////////////////////////////////////////////////////////////
/// MessageDrafting
/// @description Generates a new DraftSelect message.
/// @pre None
/// @post a new message is generated.
///////////////////////////////////////////////////////////////////////////////
ModuleMessage LBAgent::MessageDraftSelect(float amount)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
LoadBalancingMessage msg;
DraftSelectMessage * submsg = msg.mutable_draft_select_message();
submsg->set_migrate_step(amount);
return PrepareForSending(msg);
}
///////////////////////////////////////////////////////////////////////////////
/// SendDraftSelect
/// @description Sends a DraftSelect Message to specified peer.
/// @pre Peer and step are valid
/// @post A Draft select emssage is sent to the peer
///////////////////////////////////////////////////////////////////////////////
void LBAgent::SendDraftSelect(CPeerNode peer, float step)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
try
{
peer.Send(MessageDraftSelect(step));
SetPStar(m_PredictedGateway + step);
m_PowerDifferential += step;
}
catch(boost::system::system_error & e)
{
Logger.Warn << "Couldn't connect to peer" << std::endl;
}
}
///////////////////////////////////////////////////////////////////////////////
/// HandleDraftSelect
/// @description A draft select message is accepted by a demand node as an
/// indication a supply node is about to give it some tasty power.
/// When the drafting message arrives the demand node will actuate it's
/// physical leaves and signal the supply node to do the same by sending
/// back an accept message.
/// @pre There is a valid message pointer and peer passed into the module. All
/// required ptree keys are present.
/// @post If the node is in demand and will take the supply node's power this
/// node will generate an accept message and change a device value to
/// accept the new float.
/// @param m The message body that was recieved by this process.
/// @param peer The process that the message orginated from.
/// @peers A supply node in my group.
/// @limitations Does not validate the source, integrity or contents of the
/// message.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::HandleDraftSelect(const DraftSelectMessage & m, CPeerNode peer)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
if(CountInPeerSet(m_AllPeers, peer) == 0)
{
Logger.Notice << "Rejected Draft Select: peer node in group" << std::endl;
}
else if(CGlobalConfiguration::Instance().GetMaliciousFlag())
{
Logger.Notice << "(MALICIOUS) Dropped draft select message." << std::endl;
}
else
{
float amount = m.migrate_step();
try
{
if(m_NetGeneration <= m_PredictedGateway - amount)
{
peer.Send(MessageDraftAccept(amount));
SetPStar(m_PredictedGateway - amount);
}
else
{
peer.Send(MessageTooLate(amount));
}
}
catch(boost::system::system_error & error)
{
Logger.Warn << "Couldn't connect to peer" << std::endl;
}
}
}
///////////////////////////////////////////////////////////////////////////////
/// MessageDraftAccept
/// @description Generates a new accept message
/// @pre None
/// @post an Accept message is generated.
///////////////////////////////////////////////////////////////////////////////
ModuleMessage LBAgent::MessageDraftAccept(float amount)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
LoadBalancingMessage msg;
DraftAcceptMessage * submsg = msg.mutable_draft_accept_message();
submsg->set_migrate_step(amount);
return PrepareForSending(msg);
}
///////////////////////////////////////////////////////////////////////////////
/// MessageTooLate
/// @description Generates a new too late message
/// @pre None
/// @post A too late message is generated.
///////////////////////////////////////////////////////////////////////////////
ModuleMessage LBAgent::MessageTooLate(float amount)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
LoadBalancingMessage msg;
TooLateMessage * submsg = msg.mutable_too_late_message();
submsg->set_migrate_step(amount);
return PrepareForSending(msg);
}
///////////////////////////////////////////////////////////////////////////////
/// HandleDraftAccept
/// @description An accept message will arrive from a demand node that has
/// selected to accept a migration from this supply node.
/// @pre m and peer is valid.
/// @post If the node is in supply, it will adjust the gross powerflow to note
/// the reciever has adjusted their power.
/// @param m The message body that was recieved by this process.
/// @param peer The process that the message orginated from.
/// @peers A demand node in my group.
/// @limitations Does not validate the source, integrity or contents of the
/// message.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::HandleDraftAccept(const DraftAcceptMessage & m, CPeerNode /* peer */)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
m_PowerDifferential -= m.migrate_step();
}
///////////////////////////////////////////////////////////////////////////////
/// HandleTooLate
/// @description An accept message will arrive from a demand node that has
/// selected to accept a migration from this supply node, but no longer
/// needs that power.
/// @pre m and peer is valid.
/// @post This node will adjust its gross powerflow and revert the
/// power setting to cancel the migration.
/// @param m The message body that was recieved by this process.
/// @peers A demand node in my group.
/// @limitations Does not validate the source, integrity or contents of the
/// message.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::HandleTooLate(const TooLateMessage & m)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
SetPStar(m_PredictedGateway - m.migrate_step());
m_PowerDifferential -= m.migrate_step();
}
///////////////////////////////////////////////////////////////////////////////
/// HandlePeerList
/// @description Updates the list of peers this node is aware of.
/// @pre There is a valid message pointer and peer passed into the module.
/// @post The AllPeers, Normal, Supply, and Demand peersets are reset.
/// @param m The message body that was recieved by this process.
/// @param peer The process that the message orginated from.
/// @peers Group leader.
/// @limitations Does not validate the source, integrity or contents of the
/// message.
///////////////////////////////////////////////////////////////////////////////
void LBAgent::HandlePeerList(const gm::PeerListMessage & m, CPeerNode peer)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
Logger.Notice << "Updated peer list received from: " << peer.GetUUID() << std::endl;
m_AllPeers.clear();
m_InSupply.clear();
m_InDemand.clear();
m_InNormal.clear();
PeerSet temp = gm::GMAgent::ProcessPeerList(m);
BOOST_FOREACH(CPeerNode p, temp | boost::adaptors::map_values)
{
if(CountInPeerSet(m_AllPeers, p) == 0 && p.GetUUID() != GetUUID())
{
Logger.Debug << "Recognize new peer: " << p.GetUUID() << std::endl;
InsertInPeerSet(m_AllPeers, p);
InsertInPeerSet(m_InNormal, p);
}
}
m_Leader = peer.GetUUID();
}
////////////////////////////////////////////////////////////
/// SetPStar
/// @description Migrates power by adjusting the gateway settings of the
/// attched SSTs
/// @pre: Current load state of this node is 'Supply' or 'Demand'
/// @post: Set command(s) to SST
/// @param pstar the new pstar setting to use.
/////////////////////////////////////////////////////////
void LBAgent::SetPStar(float pstar)
{
Logger.Trace << __PRETTY_FUNCTION__ << std::endl;
std::set<device::CDevice::Pointer> sstContainer;
sstContainer = device::CDeviceManager::Instance().GetDevicesOfType("Sst");
if(sstContainer.size() > 0)
{
if(sstContainer.size() > 1)
{
Logger.Warn << "Multiple attached SST devices" << std::endl;
}
(*sstContainer.begin())->SetCommand("gateway", pstar);
m_PredictedGateway = pstar;
Logger.Notice << "P* = " << pstar << std::endl;
}
else
{
Logger.Warn << "Failed to set P*: no attached SST device" << std::endl;
}
}
///////////////////////////////////////////////////////////////////////////////
/// Wraps a LoadBalancingMessage in a ModuleMessage.
///
/// @param m the message to prepare. If any required field is unset,
/// the DGI will abort.
/// @param recipient the module (sc/lb/gm/clk etc.) the message should be