Compressed activity log database storage

chrome/browser/extensions/activity_log/fullstream_ui_policy.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_FULLSTREAM_UI_POLICY_H_
 #define CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_FULLSTREAM_UI_POLICY_H_
 
 #include <string>
 
 #include "chrome/browser/extensions/activity_log/activity_database.h"
 #include "chrome/browser/extensions/activity_log/activity_log_policy.h"
+#include "chrome/browser/extensions/activity_log/database_interned_string.h"
 
 class GURL;
 
 namespace extensions {
 
 // A policy for logging the full stream of actions, including all arguments.
 // It's mostly intended to be used in testing and analysis.
 class FullStreamUIPolicy : public ActivityLogDatabasePolicy {
  public:
   // For more info about these member functions, see the super class.
@@ skipping 34 matching lines @@
   virtual bool FlushDatabase(sql::Connection* db) OVERRIDE;
   virtual void OnDatabaseFailure() OVERRIDE;
   virtual void OnDatabaseClose() OVERRIDE;
 
   // Strips arguments if needed by policy.  May return the original object (if
   // unmodified), or a copy (if modifications were made).  The implementation
   // in FullStreamUIPolicy returns the action unmodified.
   virtual scoped_refptr<Action> ProcessArguments(
       scoped_refptr<Action> action) const;
 
+  // Tables for mapping strings to integers for shrinking database storage
+  // requirements.  URLs are kept in a separate table from other strings to
+  // make history clearing simpler.
+  DatabaseStringTable string_table_;
+  DatabaseStringTable url_table_;
+
   // Tracks any pending updates to be written to the database, if write
   // batching is turned on.  Should only be accessed from the database thread.
   Action::ActionVector queued_actions_;
 
  private:
   // Adds an Action to queued_actions_; this should be invoked only on the
   // database thread.
   void QueueAction(scoped_refptr<Action> action);
 
   // The implementation of ReadData; this must only run on the database thread.
   scoped_ptr<Action::ActionVector> DoReadData(const std::string& extension_id,
                                               const int days_ago);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_FULLSTREAM_UI_POLICY_H_