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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (C) 2014 Named Data Networking Project
* See COPYING for copyright and distribution information.
*/
#include "strategy-choice.hpp"
#include "fw/strategy.hpp"
#include "pit-entry.hpp"
namespace nfd {
using strategy_choice::Entry;
using fw::Strategy;
NFD_LOG_INIT("StrategyChoice");
StrategyChoice::StrategyChoice(NameTree& nameTree, shared_ptr<Strategy> defaultStrategy)
: m_nameTree(nameTree)
{
this->setDefaultStrategy(defaultStrategy);
}
bool
StrategyChoice::hasStrategy(const Name& strategyName) const
{
return m_strategyInstances.count(strategyName) > 0;
}
bool
StrategyChoice::install(shared_ptr<Strategy> strategy)
{
BOOST_ASSERT(static_cast<bool>(strategy));
const Name& strategyName = strategy->getName();
if (this->hasStrategy(strategyName)) {
NFD_LOG_ERROR("install(" << strategyName << ") duplicate strategyName");
return false;
}
m_strategyInstances[strategyName] = strategy;
return true;
}
bool
StrategyChoice::insert(const Name& prefix, const Name& strategyName)
{
shared_ptr<name_tree::Entry> nameTreeEntry = m_nameTree.lookup(prefix);
shared_ptr<Entry> entry = nameTreeEntry->getStrategyChoiceEntry();
shared_ptr<Strategy> oldStrategy;
if (static_cast<bool>(entry)) {
if (entry->getStrategy().getName() == strategyName) {
NFD_LOG_INFO("insert(" << prefix << "," << strategyName << ") not changing");
return true;
}
oldStrategy = entry->getStrategy().shared_from_this();
NFD_LOG_INFO("insert(" << prefix << "," << strategyName << ") "
"changing from " << oldStrategy->getName());
}
shared_ptr<Strategy> strategy = this->getStrategy(strategyName);
if (!static_cast<bool>(strategy)) {
NFD_LOG_ERROR("insert(" << prefix << "," << strategyName << ") strategy not installed");
return false;
}
if (!static_cast<bool>(entry)) {
oldStrategy = this->findEffectiveStrategy(prefix).shared_from_this();
entry = make_shared<Entry>(prefix);
nameTreeEntry->setStrategyChoiceEntry(entry);
++m_nItems;
NFD_LOG_INFO("insert(" << prefix << "," << strategyName << ") new entry");
}
this->changeStrategy(entry, oldStrategy, strategy);
return true;
}
void
StrategyChoice::erase(const Name& prefix)
{
BOOST_ASSERT(prefix.size() > 0);
shared_ptr<name_tree::Entry> nameTreeEntry = m_nameTree.findExactMatch(prefix);
if (!static_cast<bool>(nameTreeEntry)) {
return;
}
shared_ptr<Entry> entry = nameTreeEntry->getStrategyChoiceEntry();
if (!static_cast<bool>(entry)) {
return;
}
Strategy& oldStrategy = entry->getStrategy();
nameTreeEntry->setStrategyChoiceEntry(shared_ptr<Entry>());
--m_nItems;
Strategy& parentStrategy = this->findEffectiveStrategy(prefix);
this->changeStrategy(entry, oldStrategy.shared_from_this(), parentStrategy.shared_from_this());
}
shared_ptr<const Name>
StrategyChoice::get(const Name& prefix) const
{
shared_ptr<name_tree::Entry> nameTreeEntry = m_nameTree.findExactMatch(prefix);
if (!static_cast<bool>(nameTreeEntry)) {
return shared_ptr<const Name>();
}
shared_ptr<Entry> entry = nameTreeEntry->getStrategyChoiceEntry();
if (!static_cast<bool>(entry)) {
return shared_ptr<const Name>();
}
return entry->getStrategy().getName().shared_from_this();
}
static inline bool
predicate_NameTreeEntry_hasStrategyChoiceEntry(const name_tree::Entry& entry)
{
return static_cast<bool>(entry.getStrategyChoiceEntry());
}
Strategy&
StrategyChoice::findEffectiveStrategy(const Name& prefix) const
{
shared_ptr<name_tree::Entry> nameTreeEntry =
m_nameTree.findLongestPrefixMatch(prefix, &predicate_NameTreeEntry_hasStrategyChoiceEntry);
BOOST_ASSERT(static_cast<bool>(nameTreeEntry));
return nameTreeEntry->getStrategyChoiceEntry()->getStrategy();
}
Strategy&
StrategyChoice::findEffectiveStrategy(const pit::Entry& pitEntry) const
{
return this->findEffectiveStrategy(pitEntry.getName());
}
shared_ptr<fw::Strategy>
StrategyChoice::getStrategy(const Name& strategyName)
{
StrategyInstanceTable::iterator it = m_strategyInstances.find(strategyName);
return it != m_strategyInstances.end() ? it->second : shared_ptr<fw::Strategy>();
}
void
StrategyChoice::setDefaultStrategy(shared_ptr<Strategy> strategy)
{
this->install(strategy);
// don't use .insert here, because it will invoke findEffectiveStrategy
// which expects an existing root entry
shared_ptr<name_tree::Entry> nameTreeEntry = m_nameTree.lookup(Name());
shared_ptr<Entry> entry = make_shared<Entry>(Name());
nameTreeEntry->setStrategyChoiceEntry(entry);
++m_nItems;
NFD_LOG_INFO("setDefaultStrategy(" << strategy->getName() << ") new entry");
entry->setStrategy(strategy);
}
void
StrategyChoice::changeStrategy(shared_ptr<strategy_choice::Entry> entry,
shared_ptr<fw::Strategy> oldStrategy,
shared_ptr<fw::Strategy> newStrategy)
{
entry->setStrategy(newStrategy);
if (oldStrategy == newStrategy) {
return;
}
// TODO delete incompatible StrategyInfo
NFD_LOG_WARN("changeStrategy(" << entry->getPrefix() << ") " <<
"runtime strategy change not implemented");
}
} // namespace nfd