Initial commit of sync engine code to browser/sync.

The code is not built on any platform yet.  That will arrive
as a subsequent checkin.

This is an implementation of the interface exposed earlier
through syncapi.h.  It is the client side of a sync
protocol that lets users sync their browser data
(currently, just bookmarks) with their Google Account.

Table of contents:

browser/sync/
  protocol - The protocol definition, and
             other definitions necessary to connect to
             the service.
  syncable/ - defines a data model for syncable objects,
              and provides a sqlite-based backing store
              for this model.
  engine/ - includes the core sync logic, including commiting
            changes to the server, downloading changes from
            the server, resolving conflicts, other parts of
            the sync algorithm.
  engine/net - parts of the sync engine focused on the
               business of talking to the server.  Some of
               this is binds a generic "server connection"
               interface to a concrete implementation
               provided by Chromium.
  notifier - the part of the syncer focused on the business
             of sending and receiving xmpp notifications.
             Notifications are used instead of polling to
             achieve very low latency change propagation.
  util - not necessarily sync specific utility code.  Much
         of this is scaffolding which should either be
         replaced by, or merged with, the utility code
         in base/.

BUG=none
TEST=this code includes its own suite of unit tests.

Review URL: http://codereview.chromium.org/194065

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25850 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 98 insertions, 0 deletions

diff --git a/chrome/browser/sync/engine/update_applicator.cc b/chrome/browser/sync/engine/update_applicator.cc
new file mode 100644
index 0000000..17e6b36
--- /dev/null
+++ b/chrome/browser/sync/engine/update_applicator.cc
@@ -0,0 +1,98 @@
+// Copyright (c) 2009 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 "chrome/browser/sync/engine/update_applicator.h"
+
+#include <vector>
+
+#include "base/logging.h"
+#include "chrome/browser/sync/engine/syncer_util.h"
+#include "chrome/browser/sync/syncable/syncable.h"
+#include "chrome/browser/sync/syncable/syncable_id.h"
+
+using std::vector;
+
+namespace browser_sync {
+
+UpdateApplicator::UpdateApplicator(SyncerSession* session,
+                                   const vi64iter& begin,
+                                   const vi64iter& end)
+    : session_(session), begin_(begin), end_(end), pointer_(begin),
+      progress_(false) {
+    size_t item_count = end - begin;
+    LOG(INFO) << "UpdateApplicator created for " << item_count << " items.";
+    successful_ids_.reserve(item_count);
+  }
+
+// returns true if there's more to do.
+bool UpdateApplicator::AttemptOneApplication(
+    syncable::WriteTransaction* trans) {
+  // If there are no updates left to consider, we're done.
+  if (end_ == begin_)
+    return false;
+  if (pointer_ == end_) {
+    if (!progress_)
+      return false;
+
+    LOG(INFO) << "UpdateApplicator doing additional pass.";
+    pointer_ = begin_;
+    progress_ = false;
+
+    // Clear the tracked failures to avoid double-counting.
+    conflicting_ids_.clear();
+    blocked_ids_.clear();
+  }
+  syncable::MutableEntry entry(trans, syncable::GET_BY_HANDLE, *pointer_);
+  UpdateAttemptResponse updateResponse =
+      SyncerUtil::AttemptToUpdateEntry(trans, &entry, session_);
+  switch (updateResponse) {
+    case SUCCESS:
+      --end_;
+      *pointer_ = *end_;
+      progress_ = true;
+      successful_ids_.push_back(entry.Get(syncable::ID));
+      break;
+    case CONFLICT:
+      pointer_++;
+      conflicting_ids_.push_back(entry.Get(syncable::ID));
+      break;
+    case BLOCKED:
+      pointer_++;
+      blocked_ids_.push_back(entry.Get(syncable::ID));
+      break;
+  }
+  LOG(INFO) << "Apply Status for " << entry.Get(syncable::META_HANDLE)
+            << " is " << updateResponse;
+
+  return true;
+}
+
+bool UpdateApplicator::AllUpdatesApplied() const {
+  return conflicting_ids_.empty() && blocked_ids_.empty() &&
+         begin_ == end_;
+}
+
+void UpdateApplicator::SaveProgressIntoSessionState() {
+  DCHECK(begin_ == end_ || ((pointer_ == end_) && !progress_))
+      << "SaveProgress called before updates exhausted.";
+
+  vector<syncable::Id>::const_iterator i;
+  for (i = conflicting_ids_.begin(); i != conflicting_ids_.end(); ++i) {
+    session_->EraseBlockedItem(*i);
+    session_->AddCommitConflict(*i);
+    session_->AddAppliedUpdate(CONFLICT, *i);
+  }
+  for (i = blocked_ids_.begin(); i != blocked_ids_.end(); ++i) {
+    session_->AddBlockedItem(*i);
+    session_->EraseCommitConflict(*i);
+    session_->AddAppliedUpdate(BLOCKED, *i);
+  }
+  for (i = successful_ids_.begin(); i != successful_ids_.end(); ++i) {
+    session_->EraseCommitConflict(*i);
+    session_->EraseBlockedItem(*i);
+    session_->AddAppliedUpdate(SUCCESS, *i);
+  }
+}
+
+}  // namespace browser_sync