Decouple stability instrumentation recording and collection

components/browser_watcher/postmortem_report_collector.h

Index: components/browser_watcher/postmortem_report_collector.h
diff --git a/components/browser_watcher/postmortem_report_collector.h b/components/browser_watcher/postmortem_report_collector.h
index 01871812eded07ee2d1ecf769721d0cdedd0850f..3e6287535ccc8b0cd884ec108ae00832e20636ab 100644
--- a/components/browser_watcher/postmortem_report_collector.h
+++ b/components/browser_watcher/postmortem_report_collector.h
@@ -28,31 +28,40 @@
 
 namespace browser_watcher {
 
+// An interface to process postmortem stability files.
+class PostmortemProcessor {

[Sigurður Ásgeirsson, 2017/06/05 15:39:39]

I don't see that hoisting an interface here is helping you in any way, shape or
form. I don't see any case where you're using polymorphic dispatch to these
classes - it's always instantiate one or the other, then call it.

I'd say just remove this interface have two unrelated classes handling the two
cases, unless I've missed something?

[manzagop (departed), 2017/06/05 18:02:16]

I initially thought there'd be a factory, but didn't do it in the end. Removed. 

Done.

+ public:
+  virtual ~PostmortemProcessor() = default;
+
+  virtual void Process(const std::vector<base::FilePath>& stability_files) = 0;
+};
+
+class PostmortemDeleter : public PostmortemProcessor {
+ public:
+  PostmortemDeleter() = default;
+  ~PostmortemDeleter() override = default;
+
+  void Process(const std::vector<base::FilePath>& stability_files);
+};
+
 // Handles postmortem report collection by establishing the set of stability
 // files to collect, then for each file:
 //   - extracting a report protocol buffer
 //   - registering a crash report with the crash database
 //   - writing a minidump file for the report
 // TODO(manzagop): throttling, graceful handling of accumulating data.
-class PostmortemReportCollector {
+class PostmortemReportCollector : public PostmortemProcessor {
  public:
   PostmortemReportCollector(const std::string& product_name,
                             const std::string& version_number,
                             const std::string& channel_name,
+                            crashpad::CrashReportDatabase* report_database,
                             SystemSessionAnalyzer* analyzer);
-  virtual ~PostmortemReportCollector();
-
-  // Collects postmortem stability reports from files found in |debug_info_dir|,
-  // relying on |debug_file_pattern| and |excluded_debug_files|. Reports are
-  // then wrapped in Crashpad reports, manufactured via |report_database|.
-  // Returns the number crash reports successfully registered with the reporter.
-  // TODO(manzagop): consider mechanisms for partial collection if this is to be
-  //     used on a critical path.
-  int CollectAndSubmitAllPendingReports(
-      const base::FilePath& debug_info_dir,
-      const base::FilePath::StringType& debug_file_pattern,
-      const std::set<base::FilePath>& excluded_debug_files,
-      crashpad::CrashReportDatabase* report_database);
+  ~PostmortemReportCollector() override;
+
+  // Collects postmortem stability reports from |stability_files|. Reports are
+  // then wrapped in Crashpad reports and registered with the crash database.
+  void Process(const std::vector<base::FilePath>& stability_files);
 
   const std::string& product_name() const { return product_name_; }
   const std::string& version_number() const { return version_number_; }
@@ -81,18 +90,10 @@ class PostmortemReportCollector {
       PostmortemReportCollectorCollectionFromGlobalTrackerTest,
       SystemStateTest);
 
-  // Virtual for unittesting.
-  virtual std::vector<base::FilePath> GetDebugStateFilePaths(
-      const base::FilePath& debug_info_dir,
-      const base::FilePath::StringType& debug_file_pattern,
-      const std::set<base::FilePath>& excluded_debug_files);
-
   // Collects a stability file, generates a report and registers it with the
-  // database. Returns true on success. False otherwise.
-  bool CollectAndSubmitOneReport(const crashpad::UUID& client_id,
-                                 const base::FilePath& file,
-                                 crashpad::CrashReportDatabase* report_database,
-                                 bool* system_unclean);
+  // database.
+  void CollectAndSubmitOneReport(const crashpad::UUID& client_id,
+                                 const base::FilePath& file);
 
   virtual CollectionStatus CollectOneReport(
       const base::FilePath& stability_file,
@@ -111,6 +112,7 @@ class PostmortemReportCollector {
   std::string version_number_;
   std::string channel_name_;
 
+  crashpad::CrashReportDatabase* report_database_;  // Not owned.
   SystemSessionAnalyzer* system_session_analyzer_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(PostmortemReportCollector);