in-memory-storage-lru.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "in-memory-storage-lru.hpp"

namespace ndn {
namespace util {

InMemoryStorageLru::InMemoryStorageLru(size_t limit)
  : InMemoryStorage(limit)
{
}

InMemoryStorageLru::InMemoryStorageLru(boost::asio::io_service& ioService,
                                       size_t limit)
  : InMemoryStorage(ioService, limit)
{
}

InMemoryStorageLru::~InMemoryStorageLru()
{
}

void
InMemoryStorageLru::afterInsert(InMemoryStorageEntry* entry)
{
  BOOST_ASSERT(m_cleanupIndex.size() <= size());
  InMemoryStorageEntry* ptr = entry;
  m_cleanupIndex.insert(ptr);
}

bool
InMemoryStorageLru::evictItem()
{
  if (!m_cleanupIndex.get<byUsedTime>().empty()) {
    CleanupIndex::index<byUsedTime>::type::iterator it = m_cleanupIndex.get<byUsedTime>().begin();
    eraseImpl((*it)->getFullName());
    m_cleanupIndex.get<byUsedTime>().erase(it);
    return true;
  }

  return false;
}

void
InMemoryStorageLru::beforeErase(InMemoryStorageEntry* entry)
{
  CleanupIndex::index<byEntity>::type::iterator it = m_cleanupIndex.get<byEntity>().find(entry);
  if (it != m_cleanupIndex.get<byEntity>().end())
    m_cleanupIndex.get<byEntity>().erase(it);
}

void
InMemoryStorageLru::afterAccess(InMemoryStorageEntry* entry)
{
  beforeErase(entry);
  afterInsert(entry);
}

} // namespace util
} // namespace ndn