table: Strategy Choice table
refs #1309
Change-Id: I6fd8efdfc98175a1cc39fdc3aa7175671596f470
diff --git a/daemon/table/strategy-choice.cpp b/daemon/table/strategy-choice.cpp
new file mode 100644
index 0000000..9e5cb37
--- /dev/null
+++ b/daemon/table/strategy-choice.cpp
@@ -0,0 +1,178 @@
+/* -*- 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