tests: Fix issue with UnitTestClock-based event scheduling (extra sleep required)

Change-Id: I77f24f630697b6e41b3d935f0f1416e806516412
Refs: #2152
diff --git a/src/security/certificate-cache-ttl.cpp b/src/security/certificate-cache-ttl.cpp
new file mode 100644
index 0000000..2ab13c9
--- /dev/null
+++ b/src/security/certificate-cache-ttl.cpp
@@ -0,0 +1,105 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
+ */
+
+#include "certificate-cache-ttl.hpp"
+
+namespace ndn {
+
+CertificateCacheTtl::CertificateCacheTtl(boost::asio::io_service& io,
+                                         const time::seconds& defaultTtl/* = time::seconds(3600)*/)
+  : m_defaultTtl(defaultTtl)
+  , m_io(io)
+  , m_scheduler(m_io)
+{
+}
+
+CertificateCacheTtl::~CertificateCacheTtl()
+{
+}
+
+void
+CertificateCacheTtl::insertCertificate(shared_ptr<const IdentityCertificate> certificate)
+{
+  m_io.dispatch([this, certificate] { this->insert(certificate); });
+}
+
+shared_ptr<const IdentityCertificate>
+CertificateCacheTtl::getCertificate(const Name& certificateName)
+{
+  Cache::iterator it = m_cache.find(certificateName);
+  if (it != m_cache.end())
+    return it->second.first;
+  else
+    return shared_ptr<IdentityCertificate>();
+}
+
+void
+CertificateCacheTtl::reset()
+{
+  m_io.dispatch([this] { this->removeAll(); });
+}
+
+size_t
+CertificateCacheTtl::getSize()
+{
+  return m_cache.size();
+}
+
+void
+CertificateCacheTtl::insert(shared_ptr<const IdentityCertificate> certificate)
+{
+  time::milliseconds expire = (certificate->getFreshnessPeriod() >= time::seconds::zero() ?
+                               certificate->getFreshnessPeriod() : m_defaultTtl);
+
+  Name index = certificate->getName().getPrefix(-1);
+
+  Cache::iterator it = m_cache.find(index);
+  if (it != m_cache.end())
+    m_scheduler.cancelEvent(it->second.second);
+
+  EventId eventId = m_scheduler.scheduleEvent(expire,
+                                              bind(&CertificateCacheTtl::remove,
+                                                   this, certificate->getName()));
+
+  m_cache[index] = std::make_pair(certificate, eventId);
+}
+
+void
+CertificateCacheTtl::remove(const Name& certificateName)
+{
+  Name name = certificateName.getPrefix(-1);
+  Cache::iterator it = m_cache.find(name);
+  if (it != m_cache.end())
+    m_cache.erase(it);
+}
+
+void
+CertificateCacheTtl::removeAll()
+{
+  for(Cache::iterator it = m_cache.begin(); it != m_cache.end(); it++)
+    m_scheduler.cancelEvent(it->second.second);
+
+  m_cache.clear();
+}
+
+} // namespace ndn