Precache tracking database

components/precache/core/precache_statistics_table.cc

Index: components/precache/core/precache_statistics_table.cc
diff --git a/components/precache/core/precache_statistics_table.cc b/components/precache/core/precache_statistics_table.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f49e22ed65f405774cd7d8223b978d2570290114
--- /dev/null
+++ b/components/precache/core/precache_statistics_table.cc
@@ -0,0 +1,152 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/precache/core/precache_statistics_table.h"
+
+#include "base/logging.h"
+#include "base/strings/stringprintf.h"
+#include "sql/connection.h"
+#include "sql/statement.h"
+
+using sql::Statement;
+
+namespace {
+
+// Returns the number of 24 hour intervals that have passed between time 0 and
+// |time_on_day|, rounded down.
+int64 GetKey(const base::Time& time_on_day) {
+  return (time_on_day - base::Time()).InDays();
+}
+
+// Returns the time of the beginning of the 24 hour interval specified by |key|.
+base::Time FromKey(int64 key) {
+  return base::Time() + base::TimeDelta::FromDays(key);
+}
+
+}  // namespace
+
+namespace precache {
+
+PrecacheStatisticsTable::PrecacheStatistics::PrecacheStatistics()
+    : downloaded_precache_motivated_bytes(0),
+      downloaded_non_precache_bytes(0),
+      downloaded_non_precache_bytes_cellular(0),
+      saved_bytes(0),
+      saved_bytes_cellular(0) {}
+
+PrecacheStatisticsTable::PrecacheStatistics::PrecacheStatistics(
+    int64 downloaded_precache_motivated_bytes,
+    int64 downloaded_non_precache_bytes,
+    int64 downloaded_non_precache_bytes_cellular, int64 saved_bytes,
+    int64 saved_bytes_cellular)
+    : downloaded_precache_motivated_bytes(downloaded_precache_motivated_bytes),
+      downloaded_non_precache_bytes(downloaded_non_precache_bytes),
+      downloaded_non_precache_bytes_cellular(
+          downloaded_non_precache_bytes_cellular),
+      saved_bytes(saved_bytes),
+      saved_bytes_cellular(saved_bytes_cellular) {}
+
+bool PrecacheStatisticsTable::PrecacheStatistics::operator==(
+    const PrecacheStatistics& other) const {
+  return downloaded_precache_motivated_bytes ==
+             other.downloaded_precache_motivated_bytes &&
+         downloaded_non_precache_bytes == other.downloaded_non_precache_bytes &&
+         downloaded_non_precache_bytes_cellular ==
+             other.downloaded_non_precache_bytes_cellular &&
+         saved_bytes == other.saved_bytes &&
+         saved_bytes_cellular == other.saved_bytes_cellular;
+}
+
+PrecacheStatisticsTable::PrecacheStatisticsTable() : db_(NULL) {}
+
+PrecacheStatisticsTable::~PrecacheStatisticsTable() {}
+
+void PrecacheStatisticsTable::Init(sql::Connection* db) {
+  DCHECK(!db_);  // Init must only be called once.
+  DCHECK(db);    // The database connection must be non-NULL.
+  db_ = db;
+  CreateTableIfNonExistent();
+}
+
+void PrecacheStatisticsTable::IncreaseDailyStats(
+    const base::Time& time_on_day, const PrecacheStatistics& delta) {
+  // Create a row for that day if there is no existing one.
+  Statement insert_statement(db_->GetCachedStatement(
+      SQL_FROM_HERE,
+      "INSERT OR IGNORE INTO precache_statistics (date) VALUES(?)"));
+
+  insert_statement.BindInt64(0, GetKey(time_on_day));
+  insert_statement.Run();
+
+  // Increase the recorded statistics for that day.
+  Statement update_statement(db_->GetCachedStatement(
+      SQL_FROM_HERE, "UPDATE precache_statistics SET "
+                         "downloaded_precache_motivated_bytes = "
+                             "downloaded_precache_motivated_bytes + ?, "
+                         "downloaded_non_precache_bytes = "
+                             "downloaded_non_precache_bytes + ?, "
+                         "downloaded_non_precache_bytes_cellular = "
+                             "downloaded_non_precache_bytes_cellular + ?, "
+                         "saved_bytes = saved_bytes + ?, "
+                         "saved_bytes_cellular = saved_bytes_cellular + ? "
+                     "WHERE date = ?"));
+
+  update_statement.BindInt64(0, delta.downloaded_precache_motivated_bytes);
+  update_statement.BindInt64(1, delta.downloaded_non_precache_bytes);
+  update_statement.BindInt64(2, delta.downloaded_non_precache_bytes_cellular);
+  update_statement.BindInt64(3, delta.saved_bytes);
+  update_statement.BindInt64(4, delta.saved_bytes_cellular);
+  update_statement.BindInt64(5, GetKey(time_on_day));
+
+  update_statement.Run();
+}
+
+void PrecacheStatisticsTable::GetOldStats(const base::Time& current_time,
+                                          PrecacheStatisticsMap* stats_map) {
+  stats_map->clear();
+
+  Statement statement(db_->GetCachedStatement(
+      SQL_FROM_HERE, "SELECT date, "
+                     "downloaded_precache_motivated_bytes, "
+                     "downloaded_non_precache_bytes, "
+                     "downloaded_non_precache_bytes_cellular, "
+                     "saved_bytes, "
+                     "saved_bytes_cellular "
+                     "FROM precache_statistics WHERE date < ?"));
+  statement.BindInt64(0, GetKey(current_time));
+
+  while (statement.Step()) {
+    base::Time date = FromKey(statement.ColumnInt64(0));
+    PrecacheStatistics stats;
+
+    stats.downloaded_precache_motivated_bytes = statement.ColumnInt64(1);
+    stats.downloaded_non_precache_bytes = statement.ColumnInt64(2);
+    stats.downloaded_non_precache_bytes_cellular = statement.ColumnInt64(3);
+    stats.saved_bytes = statement.ColumnInt64(4);
+    stats.saved_bytes_cellular = statement.ColumnInt64(5);
+
+    (*stats_map)[date] = stats;
+  }
+}
+
+void PrecacheStatisticsTable::DeleteOldStats(const base::Time& current_time) {
+  Statement statement(db_->GetCachedStatement(
+      SQL_FROM_HERE, "DELETE FROM precache_statistics WHERE date < ?"));
+
+  statement.BindInt64(0, GetKey(current_time));
+  statement.Run();
+}
+
+void PrecacheStatisticsTable::CreateTableIfNonExistent() {
+  ignore_result(db_->Execute(
+      "CREATE TABLE IF NOT EXISTS precache_statistics ("
+      "date INTEGER PRIMARY KEY, "
+      "downloaded_precache_motivated_bytes INTEGER DEFAULT 0, "
+      "downloaded_non_precache_bytes INTEGER DEFAULT 0, "
+      "downloaded_non_precache_bytes_cellular INTEGER DEFAULT 0, "
+      "saved_bytes INTEGER DEFAULT 0, "
+      "saved_bytes_cellular INTEGER DEFAULT 0)"));

[Scott Hess - ex-Googler, 2013/11/27 01:32:33]

If this fails, the caller should really fail Init().

[sclittle, 2013/12/02 21:12:52]

Removed the statistics table.

+}
+
+}  // namespace precache