Report Precache.TimeSinceLastPrecache

components/precache/core/precache_session_table.cc

Index: components/precache/core/precache_session_table.cc
diff --git a/components/precache/core/precache_session_table.cc b/components/precache/core/precache_session_table.cc
index 8537b199025d38aaa2a064d59fc60613989f581f..9993c069bbe72ef3de7d9384c6bd79b3d25042b4 100644
--- a/components/precache/core/precache_session_table.cc
+++ b/components/precache/core/precache_session_table.cc
@@ -4,10 +4,12 @@
 
 #include "components/precache/core/precache_session_table.h"
 
+#include <stdint.h>
 #include <string>
 
 #include "base/logging.h"
 #include "base/time/time.h"
+#include "components/precache/core/proto/timestamp.pb.h"
 #include "components/precache/core/proto/unfinished_work.pb.h"
 #include "sql/connection.h"
 #include "sql/statement.h"
@@ -27,6 +29,38 @@ bool PrecacheSessionTable::Init(sql::Connection* db) {
   return CreateTableIfNonExistent();
 }
 
+void PrecacheSessionTable::SetLastPrecacheTimestamp(const base::Time& time) {
+  DCHECK(!time.is_null());
+  Timestamp timestamp;
+  timestamp.set_seconds((time - base::Time::UnixEpoch()).InSeconds());
+  Statement statement(db_->GetCachedStatement(
+      SQL_FROM_HERE,
+      "INSERT OR REPLACE INTO precache_session (type, value) VALUES(?,?)"));
+  statement.BindInt(0, static_cast<int>(LAST_PRECACHE_TIMESTAMP));
+  statement.BindString(1, timestamp.SerializeAsString());
+  statement.Run();
+}
+
+base::Time PrecacheSessionTable::GetLastPrecacheTimestamp() {
+  Statement statement(db_->GetCachedStatement(
+      SQL_FROM_HERE, "SELECT value from precache_session where type=?"));
+  statement.BindInt(0, static_cast<int>(LAST_PRECACHE_TIMESTAMP));
+  Timestamp timestamp;
+  if (statement.Step())
+    timestamp.ParseFromString(statement.ColumnString(0));
+  return timestamp.has_seconds()
+             ? base::Time::UnixEpoch() +
+                   base::TimeDelta::FromSeconds(timestamp.seconds())
+             : base::Time();

[twifkak, 2016/07/16 00:47:49]

Oops, I missed this edge case in the DoubleT behavior; I like this version
better already. :)

+}
+
+void PrecacheSessionTable::DeleteLastPrecacheTimestamp() {
+  Statement statement(db_->GetCachedStatement(
+      SQL_FROM_HERE, "DELETE FROM precache_session where type=?"));
+  statement.BindInt(0, static_cast<int>(LAST_PRECACHE_TIMESTAMP));
+  statement.Run();
+}
+
 // Store unfinished work.
 void PrecacheSessionTable::SaveUnfinishedWork(
     std::unique_ptr<PrecacheUnfinishedWork> unfinished_work) {