table: add Cs::erase method
This commit also corrects CS's description in Doxygen.
refs #4318
Change-Id: Ie8854a2e2b59a072b98603c0cc31768bb84ea6d2
diff --git a/daemon/table/cs-policy-priority-fifo.hpp b/daemon/table/cs-policy-priority-fifo.hpp
index 436afd9..4ac5a63 100644
--- a/daemon/table/cs-policy-priority-fifo.hpp
+++ b/daemon/table/cs-policy-priority-fifo.hpp
@@ -1,6 +1,6 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2016, Regents of the University of California,
+/*
+ * Copyright (c) 2014-2018, Regents of the University of California,
* Arizona Board of Regents,
* Colorado State University,
* University Pierre & Marie Curie, Sorbonne University,
@@ -23,8 +23,8 @@
* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
*/
-#ifndef NFD_DAEMON_TABLE_CS_POLICY_FIFO_HPP
-#define NFD_DAEMON_TABLE_CS_POLICY_FIFO_HPP
+#ifndef NFD_DAEMON_TABLE_CS_POLICY_PRIORITY_FIFO_HPP
+#define NFD_DAEMON_TABLE_CS_POLICY_PRIORITY_FIFO_HPP
#include "cs-policy.hpp"
#include "core/scheduler.hpp"
@@ -61,13 +61,17 @@
typedef std::map<iterator, EntryInfo*, EntryItComparator> EntryInfoMapFifo;
-/** \brief Priority Fifo cs replacement policy
+/** \brief Priority FIFO replacement policy
*
- * The entries that get removed first are unsolicited Data packets,
- * which are the Data packets that got cached opportunistically without preceding
- * forwarding of the corresponding Interest packet.
- * Next, the Data packets with expired freshness are removed.
- * Last, the Data packets are removed from the Content Store on a pure FIFO basis.
+ * This policy maintains a set of cleanup queues to decide the eviction order of CS entries.
+ * The cleanup queues are three doubly linked lists that store Table iterators.
+ * The three queues keep track of unsolicited, stale, and fresh Data packet, respectively.
+ * Table iterator is placed into, removed from, and moved between suitable queues
+ * whenever an Entry is added, removed, or has other attribute changes.
+ * The Table iterator of an Entry should be in exactly one queue at any moment.
+ * Within each queue, the iterators are kept in first-in-first-out order.
+ * Eviction procedure exhausts the first queue before moving onto the next queue,
+ * in the order of unsolicited, stale, and fresh queue.
*/
class PriorityFifoPolicy : public Policy
{
@@ -81,19 +85,19 @@
static const std::string POLICY_NAME;
private:
- virtual void
+ void
doAfterInsert(iterator i) override;
- virtual void
+ void
doAfterRefresh(iterator i) override;
- virtual void
+ void
doBeforeErase(iterator i) override;
- virtual void
+ void
doBeforeUse(iterator i) override;
- virtual void
+ void
evictEntries() override;
private:
@@ -132,4 +136,4 @@
} // namespace cs
} // namespace nfd
-#endif // NFD_DAEMON_TABLE_CS_POLICY_FIFO_HPP
+#endif // NFD_DAEMON_TABLE_CS_POLICY_PRIORITY_FIFO_HPP
diff --git a/daemon/table/cs.cpp b/daemon/table/cs.cpp
index 81b3fd6..54466ed 100644
--- a/daemon/table/cs.cpp
+++ b/daemon/table/cs.cpp
@@ -89,6 +89,29 @@
}
void
+Cs::erase(const Name& prefix, size_t limit, const AfterEraseCallback& cb)
+{
+ BOOST_ASSERT(static_cast<bool>(cb));
+
+ iterator first = m_table.lower_bound(prefix);
+ iterator last = m_table.end();
+ if (prefix.size() > 0) {
+ last = m_table.lower_bound(prefix.getSuccessor());
+ }
+
+ size_t nErased = 0;
+ while (first != last && nErased < limit) {
+ m_policy->beforeErase(first);
+ first = m_table.erase(first);
+ ++nErased;
+ }
+
+ if (cb) {
+ cb(nErased);
+ }
+}
+
+void
Cs::find(const Interest& interest,
const HitCallback& hitCallback,
const MissCallback& missCallback) const
diff --git a/daemon/table/cs.hpp b/daemon/table/cs.hpp
index 5a60fef..fc161c5 100644
--- a/daemon/table/cs.hpp
+++ b/daemon/table/cs.hpp
@@ -23,28 +23,6 @@
* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
*/
-/** \file
- *
- * \brief implements the ContentStore
- *
- * This ContentStore implementation consists of two data structures,
- * a Table, and a set of cleanup queues.
- *
- * The Table is a container (std::set) sorted by full Names of stored Data packets.
- * Data packets are wrapped in Entry objects.
- * Each Entry contain the Data packet itself,
- * and a few addition attributes such as the staleness of the Data packet.
- *
- * The cleanup queues are three doubly linked lists which stores Table iterators.
- * The three queues keep track of unsolicited, stale, and fresh Data packet, respectively.
- * Table iterator is placed into, removed from, and moved between suitable queues
- * whenever an Entry is added, removed, or has other attribute changes.
- * The Table iterator of an Entry should be in exactly one queue at any moment.
- * Within each queue, the iterators are kept in first-in-first-out order.
- * Eviction procedure exhausts the first queue before moving onto the next queue,
- * in the order of unsolicited, stale, and fresh queue.
- */
-
#ifndef NFD_DAEMON_TABLE_CS_HPP
#define NFD_DAEMON_TABLE_CS_HPP
@@ -57,7 +35,15 @@
namespace nfd {
namespace cs {
-/** \brief represents the ContentStore
+/** \brief implements the Content Store
+ *
+ * This Content Store implementation consists of a Table and a replacement policy.
+ *
+ * The Table is a container ( \c std::set ) sorted by full Names of stored Data packets.
+ * Data packets are wrapped in Entry objects. Each Entry contains the Data packet itself,
+ * and a few additional attributes such as when the Data becomes non-fresh.
+ *
+ * The replacement policy is implemented in a subclass of \c Policy.
*/
class Cs : noncopyable
{
@@ -70,8 +56,19 @@
void
insert(const Data& data, bool isUnsolicited = false);
- typedef std::function<void(const Interest&, const Data& data)> HitCallback;
- typedef std::function<void(const Interest&)> MissCallback;
+ using AfterEraseCallback = std::function<void(size_t nErased)>;
+
+ /** \brief asynchronously erases entries under \p prefix
+ * \param prefix name prefix of entries
+ * \param limit max number of entries to erase
+ * \param cb callback to receive the actual number of erased entries; it may be empty;
+ * it may be invoked either before or after erase() returns
+ */
+ void
+ erase(const Name& prefix, size_t limit, const AfterEraseCallback& cb);
+
+ using HitCallback = std::function<void(const Interest&, const Data&)>;
+ using MissCallback = std::function<void(const Interest&)>;
/** \brief finds the best matching Data packet
* \param interest the Interest for lookup