New architecture of the activity logging: Policies for summarization (and compression)

chrome/browser/extensions/activity_log/activity_log.h

Index: chrome/browser/extensions/activity_log/activity_log.h
diff --git a/chrome/browser/extensions/activity_log/activity_log.h b/chrome/browser/extensions/activity_log/activity_log.h
index 130f75775bd07e5169b1869790f56ea03c79381f..84b77d12f8f9c4efc06854676252063e0ffeded1 100644
--- a/chrome/browser/extensions/activity_log/activity_log.h
+++ b/chrome/browser/extensions/activity_log/activity_log.h
@@ -9,28 +9,26 @@
 #include <string>
 #include <vector>
 
-#include "base/bind.h"
-#include "base/bind_helpers.h"
 #include "base/callback.h"
-#include "base/hash_tables.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread.h"
 #include "chrome/browser/extensions/activity_log/activity_actions.h"
 #include "chrome/browser/extensions/activity_log/activity_database.h"
+#include "chrome/browser/extensions/activity_log/activity_log_policy.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
-#include "content/public/browser/browser_thread.h"
 
 class Profile;
 using content::BrowserThread;
 
 namespace extensions {
 class Extension;
+class ActivityLogPolicy;
 
 // A utility for tracing interesting activity for each extension.
 // It writes to an ActivityDatabase on a separate thread to record the activity.
@@ -95,7 +93,7 @@ class ActivityLog : public BrowserContextKeyedService,
   void LogBlockedAction(const Extension* extension,
                         const std::string& blocked_call,  // e.g., tabs.get
                         ListValue* args,                  // argument values
-                        const BlockedAction::Reason reason,  // why it's blocked
+                        BlockedAction::Reason reason,     // why it's blocked
                         const std::string& extra);        // extra logging info
 
   // Log an interaction between an extension and a URL.
@@ -127,12 +125,15 @@ class ActivityLog : public BrowserContextKeyedService,
                       <void(scoped_ptr<std::vector<scoped_refptr<Action> > >)>&
                       callback);
 
-  // An error has happened; we want to rollback and close the db.
-  // Needs to be public so the error delegate can call it.
-  void KillActivityLogDatabase();
-
-  // For unit tests only.
-  void SetArgumentLoggingForTesting(bool log_arguments);
+  // At the moment, ActivityLog will use only one policy for summarization
+  // (POLICY_NOARGS by default).  This static member function can be used
+  // to change the default type, but has to be called before the first
+  // GetInstance call.
+  // TODO(dbabic,felt) ActivityLog should support multiple policies at the
+  // same time, so this will need to be changed later.
+  static void SetDefaultPolicy(ActivityLogPolicy::PolicyType policy_type) {
+    policy_type_ = policy_type;
+  }
 
  private:
   friend class ActivityLogFactory;
@@ -167,62 +168,24 @@ class ActivityLog : public BrowserContextKeyedService,
       int32 page_id,
       const GURL& on_url) OVERRIDE;
 
-  // The callback when initializing the database.
-  void OnDBInitComplete();
-
   static const char* ActivityToString(Activity activity);
 
-  // The Schedule methods dispatch the calls to the database on a
-  // separate thread. We dispatch to the UI thread if the DB thread doesn't
-  // exist, which should only happen in tests where there is no DB thread.
-  template<typename DatabaseFunc>
-  void ScheduleAndForget(DatabaseFunc func) {
-    BrowserThread::PostTask(dispatch_thread_,
-                            FROM_HERE,
-                            base::Bind(func, base::Unretained(db_)));
-  }
-
-  template<typename DatabaseFunc, typename ArgA>
-  void ScheduleAndForget(DatabaseFunc func, ArgA a) {
-    BrowserThread::PostTask(dispatch_thread_,
-                            FROM_HERE,
-                            base::Bind(func, base::Unretained(db_), a));
-  }
-
-  template<typename DatabaseFunc, typename ArgA, typename ArgB>
-  void ScheduleAndForget(DatabaseFunc func, ArgA a, ArgB b) {
-    BrowserThread::PostTask(dispatch_thread_,
-                            FROM_HERE,
-                            base::Bind(func, base::Unretained(db_), a, b));
-  }
-
   typedef ObserverListThreadSafe<Observer> ObserverList;
   typedef std::map<const Extension*, scoped_refptr<ObserverList> >
       ObserverMap;
   // A map of extensions to activity observers for that extension.
   ObserverMap observers_;
 
-  // The database wrapper that does the actual database I/O.
-  // We initialize this on the same thread as the ActivityLog, but then
-  // subsequent operations occur on the DB thread. Instead of destructing the
-  // ActivityDatabase, we call its Close() method on the DB thread and it
-  // commits suicide.
-  extensions::ActivityDatabase* db_;
-
-  // Normally the DB thread. In some cases (tests), it might not exist
-  // we dispatch to the UI thread.
-  BrowserThread::ID dispatch_thread_;
+  // The policy object takes care of data summarization, compression, and
+  // logging
+  extensions::ActivityLogPolicy* policy_;
 
   // Whether to log activity to stdout or the UI. These are set by switches.
   bool log_activity_to_stdout_;
   bool log_activity_to_ui_;
 
-  // testing_mode_ controls whether to log API call arguments. By default, we
-  // don't log most arguments to avoid saving too much data. In testing mode,
-  // argument collection is enabled. We also whitelist some arguments for
-  // collection regardless of whether this bool is true.
-  bool testing_mode_;
-  base::hash_set<std::string> arg_whitelist_api_;
+  // TODO(dbabic,felt) change this into a list of policy types later.
+  static ActivityLogPolicy::PolicyType policy_type_;
 
   Profile* profile_;