[SYNC] Refactor SyncSourceInfo and add support in chrome invalidation client ...

chrome/browser/sync/sessions/sync_session.h

 // Copyright (c) 2010 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.
 
 // A class representing an attempt to synchronize the local syncable data
 // store with a sync server. A SyncSession instance is passed as a stateful
 // bundle to and from various SyncerCommands with the goal of converging the
 // client view of data with that of the server. The commands twiddle with
 // session status in response to events and hiccups along the way, set and
 // query session progress with regards to conflict resolution and applying
 // server updates, and access the SyncSessionContext for the current session
 // via SyncSession instances.
 
 #ifndef CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSION_H_
 #define CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSION_H_
 #pragma once
 
+#include <map>
+#include <string>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "chrome/browser/sync/sessions/ordered_commit_set.h"
 #include "chrome/browser/sync/sessions/session_state.h"
 #include "chrome/browser/sync/sessions/status_controller.h"
 #include "chrome/browser/sync/sessions/sync_session_context.h"
+#include "chrome/browser/sync/syncable/model_type.h"
 #include "chrome/browser/sync/util/extensions_activity_monitor.h"
 
 namespace syncable {
 class WriteTransaction;
 }
 
 namespace browser_sync {
 class ModelSafeWorker;
 
 namespace sessions {
-typedef std::pair<sync_pb::GetUpdatesCallerInfo::GetUpdatesSource,
-    syncable::ModelTypeBitSet> SyncSourceInfo;
+
+// A container that contains a set of datatypes with possible string payloads.
+typedef std::map<syncable::ModelType, std::string> TypePayloadMap;
+
+// Helper utils for building TypePayloadMaps.
+// Convert a ModelTypeBitset into a TypePayloadMap using a default payload.
+TypePayloadMap ModelTypeBitSetToTypePayloadMap(
+    const syncable::ModelTypeBitSet& types,
+    const std::string& payload);
+// Convert a ModelSafeRoutingInfo into a TypePayloadMap using a default payload.
+TypePayloadMap RoutingInfoToTypePayloadMap(
+    const ModelSafeRoutingInfo& routes,
+    const std::string& payload);
+// Coalesce |update| into |original|, overwriting only when |update| has

[akalin, 2011/01/26 01:15:17]

I think it's safer to change the sig of this into:

void CoalescePayloads(TypePayloadMap*, const TypePayloadMap&);

and modify the first arg in-place, as then there's less danger of switching the
arguments accidentally.  This is semantically a |= operation, anyway.

[Nicolas Zea, 2011/01/26 01:41:28]

Done.

+// a non-empty payload.
+TypePayloadMap CoalescePayloads(const TypePayloadMap& original,
+                                const TypePayloadMap& update);
+
+
+// A container for the source of a sync session. This includes the update
+// source, the datatypes triggering the sync session, and possible session
+// specific payloads which should be sent to the server.
+struct SyncSourceInfo {
+  SyncSourceInfo();
+  SyncSourceInfo(
+      const sync_pb::GetUpdatesCallerInfo::GetUpdatesSource& u,
+      const TypePayloadMap& t);
+
+  sync_pb::GetUpdatesCallerInfo::GetUpdatesSource updates_source;
+  TypePayloadMap types;
+};
 
 class SyncSession {
  public:
   // The Delegate services events that occur during the session requiring an
   // explicit (and session-global) action, as opposed to events that are simply
   // recorded in per-session state.
   class Delegate {
    public:
     // The client was throttled and should cease-and-desist syncing activity
     // until the specified time.
@@ skipping 113 matching lines @@
 
  private:
   SyncSession* session_;
   DISALLOW_COPY_AND_ASSIGN(ScopedSetSessionWriteTransaction);
 };
 
 }  // namespace sessions
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSION_H_