sync: Refactor per-datatype throttling

sync/engine/throttled_data_type_tracker.cc

Index: sync/engine/throttled_data_type_tracker.cc
diff --git a/sync/engine/throttled_data_type_tracker.cc b/sync/engine/throttled_data_type_tracker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..225cd326c85408f98538afcc8108e4e9fccf8067
--- /dev/null
+++ b/sync/engine/throttled_data_type_tracker.cc
@@ -0,0 +1,72 @@
+// Copyright (c) 2012 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 "sync/engine/throttled_data_type_tracker.h"
+
+#include "sync/internal_api/all_status.h"
+#include "sync/internal_api/public/syncable/model_type.h"
+
+namespace browser_sync {
+
+ThrottledDataTypeTracker::ThrottledDataTypeTracker(AllStatus *allstatus)
+    : allstatus_(allstatus) {
+  if (allstatus_) {
+    allstatus_->SetThrottledTypes(syncable::ModelTypeSet());
+  }
+}
+
+ThrottledDataTypeTracker::~ThrottledDataTypeTracker() { }
+
+void ThrottledDataTypeTracker::SetUnthrottleTime(syncable::ModelTypeSet types,
+                                                 const base::TimeTicks& time) {
+  for (syncable::ModelTypeSet::Iterator it = types.First();
+       it.Good(); it.Inc()) {
+    unthrottle_times_[it.Get()] = time;
+  }
+
+  DVLOG(2)
+      << "Throttling types: " << ModelTypeSetToString(types)
+      << ", throttled list is now: "
+      << ModelTypeSetToString(GetThrottledTypes());
+  if (allstatus_) {
+    allstatus_->SetThrottledTypes(GetThrottledTypes());
+  }
+}
+
+void ThrottledDataTypeTracker::PruneUnthrottledTypes(
+    const base::TimeTicks& time) {
+  bool modified = false;
+
+  UnthrottleTimes::iterator it = unthrottle_times_.begin();
+  while (it != unthrottle_times_.end()) {
+    if (it->second <= time) {
+      // Delete and increment the iterator.
+      UnthrottleTimes::iterator iterator_to_delete = it;
+      ++it;
+      unthrottle_times_.erase(iterator_to_delete);
+      modified = true;
+    } else {
+      // Just increment the iterator.
+      ++it;
+    }
+  }
+
+  DVLOG_IF(2, modified)
+      << "Remaining throttled types: "
+      << ModelTypeSetToString(GetThrottledTypes());
+  if (modified && allstatus_) {
+    allstatus_->SetThrottledTypes(GetThrottledTypes());
+  }
+}
+
+syncable::ModelTypeSet ThrottledDataTypeTracker::GetThrottledTypes() const {
+  syncable::ModelTypeSet types;
+  for (UnthrottleTimes::const_iterator it = unthrottle_times_.begin();
+       it != unthrottle_times_.end(); ++it) {
+    types.Put(it->first);
+  }
+  return types;
+}
+
+}  // namespace browser_sync