Split a MetricsLogStore object out of MetricsLogManager.

components/metrics/metrics_log_store.cc

Index: components/metrics/metrics_log_store.cc
diff --git a/components/metrics/metrics_log_manager.cc b/components/metrics/metrics_log_store.cc
similarity index 57%
copy from components/metrics/metrics_log_manager.cc
copy to components/metrics/metrics_log_store.cc
index cc35bbd5346060135ae67927289eb389d1f64872..8b1ec2a710ff7ff53f488f7d1142096e2d857002 100644
--- a/components/metrics/metrics_log_manager.cc
+++ b/components/metrics/metrics_log_store.cc
@@ -1,16 +1,12 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright 2017 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/metrics/metrics_log_manager.h"
+#include "components/metrics/metrics_log_store.h"
 
-#include <algorithm>
-#include <utility>
-
-#include "base/strings/string_util.h"
-#include "components/metrics/metrics_log.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/metrics/persisted_logs_metrics_impl.h"
+#include "components/prefs/pref_registry_simple.h"
 
 namespace metrics {
 
@@ -31,15 +27,21 @@ const size_t kInitialLogsPersistLimit = 20;
 // ongoing_log_ at startup).
 const size_t kOngoingLogsPersistLimit = 8;
 
-// The number of bytes each of initial and ongoing logs that must be stored.
+// The number of bytes of logs to save of each type (initial/ongoing).
 // This ensures that a reasonable amount of history will be stored even if there
 // is a long series of very small logs.
-const size_t kStorageByteLimitPerLogType = 300000;
+const size_t kStorageByteLimitPerLogType = 300 * 1000;  // ~300kB
 
 }  // namespace
 
-MetricsLogManager::MetricsLogManager(PrefService* local_state,
-                                     size_t max_ongoing_log_size)
+// static
+void MetricsLogStore::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterListPref(prefs::kMetricsInitialLogs);
+  registry->RegisterListPref(prefs::kMetricsOngoingLogs);
+}
+
+MetricsLogStore::MetricsLogStore(PrefService* local_state,
+                                 size_t max_ongoing_log_size)
     : unsent_logs_loaded_(false),
       initial_log_queue_(std::unique_ptr<PersistedLogsMetricsImpl>(
                              new PersistedLogsMetricsImpl()),
@@ -56,80 +58,71 @@ MetricsLogManager::MetricsLogManager(PrefService* local_state,
                          kStorageByteLimitPerLogType,
                          max_ongoing_log_size) {}
 
-MetricsLogManager::~MetricsLogManager() {}
+MetricsLogStore::~MetricsLogStore() {}
 
-void MetricsLogManager::BeginLoggingWithLog(std::unique_ptr<MetricsLog> log) {
-  DCHECK(!current_log_);
-  current_log_ = std::move(log);
+void MetricsLogStore::LoadPersistedUnsentLogs() {
+  initial_log_queue_.LoadPersistedUnsentLogs();
+  ongoing_log_queue_.LoadPersistedUnsentLogs();
+  unsent_logs_loaded_ = true;
 }
 
-void MetricsLogManager::FinishCurrentLog() {
-  DCHECK(current_log_.get());
-  current_log_->CloseLog();
-  std::string log_data;
-  current_log_->GetEncodedLog(&log_data);
-  if (!log_data.empty())
-    StoreLog(log_data, current_log_->log_type());
-  current_log_.reset();
+void MetricsLogStore::StoreLog(const std::string& log_data,
+                               MetricsLog::LogType log_type) {
+  switch (log_type) {
+    case MetricsLog::INITIAL_STABILITY_LOG:
+      initial_log_queue_.StoreLog(log_data);
+      break;
+    case MetricsLog::ONGOING_LOG:
+      ongoing_log_queue_.StoreLog(log_data);
+      break;
+  }
 }
 
-void MetricsLogManager::StageNextLogForUpload() {
-  DCHECK(!has_staged_log());
-  if (!initial_log_queue_.empty())
-    initial_log_queue_.StageLog();
-  else
-    ongoing_log_queue_.StageLog();
+bool MetricsLogStore::has_unsent_logs() const {
+  return initial_log_queue_.has_unsent_logs() ||
+         ongoing_log_queue_.has_unsent_logs();
 }
 
-void MetricsLogManager::DiscardStagedLog() {
-  DCHECK(has_staged_log());
-  if (initial_log_queue_.has_staged_log())
-    initial_log_queue_.DiscardStagedLog();
-  else
-    ongoing_log_queue_.DiscardStagedLog();
-  DCHECK(!has_staged_log());
+bool MetricsLogStore::has_staged_log() const {
+  return initial_log_queue_.has_staged_log() ||
+         ongoing_log_queue_.has_staged_log();
 }
 
-void MetricsLogManager::DiscardCurrentLog() {
-  current_log_->CloseLog();
-  current_log_.reset();
+const std::string& MetricsLogStore::staged_log() const {
+  return initial_log_queue_.has_staged_log() ? initial_log_queue_.staged_log()
+                                             : ongoing_log_queue_.staged_log();
 }
 
-void MetricsLogManager::PauseCurrentLog() {
-  DCHECK(!paused_log_.get());
-  paused_log_ = std::move(current_log_);
+const std::string& MetricsLogStore::staged_log_hash() const {
+  return initial_log_queue_.has_staged_log()
+             ? initial_log_queue_.staged_log_hash()
+             : ongoing_log_queue_.staged_log_hash();
 }
 
-void MetricsLogManager::ResumePausedLog() {
-  DCHECK(!current_log_.get());
-  current_log_ = std::move(paused_log_);
+void MetricsLogStore::StageNextLog() {
+  DCHECK(!has_staged_log());
+  if (initial_log_queue_.has_unsent_logs())
+    initial_log_queue_.StageNextLog();
+  else
+    ongoing_log_queue_.StageNextLog();
 }
 
-void MetricsLogManager::StoreLog(const std::string& log_data,
-                                 MetricsLog::LogType log_type) {
-  switch (log_type) {
-    case MetricsLog::INITIAL_STABILITY_LOG:
-      initial_log_queue_.StoreLog(log_data);
-      break;
-    case MetricsLog::ONGOING_LOG:
-      ongoing_log_queue_.StoreLog(log_data);
-      break;
-  }
+void MetricsLogStore::DiscardStagedLog() {
+  DCHECK(has_staged_log());
+  if (initial_log_queue_.has_staged_log())
+    initial_log_queue_.DiscardStagedLog();
+  else
+    ongoing_log_queue_.DiscardStagedLog();
+  DCHECK(!has_staged_log());
 }
 
-void MetricsLogManager::PersistUnsentLogs() {
+void MetricsLogStore::PersistUnsentLogs() const {
   DCHECK(unsent_logs_loaded_);
   if (!unsent_logs_loaded_)
     return;
 
-  initial_log_queue_.SerializeLogs();
-  ongoing_log_queue_.SerializeLogs();
-}
-
-void MetricsLogManager::LoadPersistedUnsentLogs() {
-  initial_log_queue_.DeserializeLogs();
-  ongoing_log_queue_.DeserializeLogs();
-  unsent_logs_loaded_ = true;
+  initial_log_queue_.PersistUnsentLogs();
+  ongoing_log_queue_.PersistUnsentLogs();
 }
 
 }  // namespace metrics