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// Copyright (c) 2011 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/sessions/session_state.h"
#include "chrome/browser/sync/syncable/syncable.h"
#include "chrome/browser/sync/syncable/syncable_id.h"
using std::vector;
namespace browser_sync {
UpdateApplicator::UpdateApplicator(ConflictResolver* resolver,
Cryptographer* cryptographer,
const UpdateIterator& begin,
const UpdateIterator& end,
const ModelSafeRoutingInfo& routes,
ModelSafeGroup group_filter)
: resolver_(resolver),
cryptographer_(cryptographer),
begin_(begin),
end_(end),
pointer_(begin),
group_filter_(group_filter),
progress_(false),
routing_info_(routes),
application_results_(end - begin) {
size_t item_count = end - begin;
VLOG(1) << "UpdateApplicator created for " << item_count << " items.";
}
UpdateApplicator::~UpdateApplicator() {
}
// 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;
VLOG(1) << "UpdateApplicator doing additional pass.";
pointer_ = begin_;
progress_ = false;
// Clear the tracked failures to avoid double-counting.
application_results_.ClearConflicts();
}
syncable::Entry read_only(trans, syncable::GET_BY_HANDLE, *pointer_);
if (SkipUpdate(read_only)) {
Advance();
return true;
}
syncable::MutableEntry entry(trans, syncable::GET_BY_HANDLE, *pointer_);
UpdateAttemptResponse updateResponse = SyncerUtil::AttemptToUpdateEntry(
trans, &entry, resolver_, cryptographer_);
switch (updateResponse) {
case SUCCESS:
Advance();
progress_ = true;
application_results_.AddSuccess(entry.Get(syncable::ID));
break;
case CONFLICT:
pointer_++;
application_results_.AddConflict(entry.Get(syncable::ID));
break;
case CONFLICT_ENCRYPTION:
pointer_++;
application_results_.AddEncryptionConflict(entry.Get(syncable::ID));
break;
default:
NOTREACHED();
break;
}
VLOG(1) << "Apply Status for " << entry.Get(syncable::META_HANDLE)
<< " is " << updateResponse;
return true;
}
void UpdateApplicator::Advance() {
--end_;
*pointer_ = *end_;
}
bool UpdateApplicator::SkipUpdate(const syncable::Entry& entry) {
syncable::ModelType type = entry.GetServerModelType();
ModelSafeGroup g = GetGroupForModelType(type, routing_info_);
// The extra routing_info count check here is to support GetUpdateses for
// a subset of the globally enabled types, and not attempt to update items
// if their type isn't permitted in the current run. These would typically
// be unapplied items from a previous sync.
if (g != group_filter_)
return true;
if (g == GROUP_PASSIVE &&
!routing_info_.count(type) &&
type != syncable::UNSPECIFIED &&
type != syncable::TOP_LEVEL_FOLDER) {
VLOG(1) << "Skipping update application, type not permitted.";
return true;
}
return false;
}
bool UpdateApplicator::AllUpdatesApplied() const {
return application_results_.no_conflicts() && begin_ == end_;
}
void UpdateApplicator::SaveProgressIntoSessionState(
sessions::ConflictProgress* conflict_progress,
sessions::UpdateProgress* update_progress) {
DCHECK(begin_ == end_ || ((pointer_ == end_) && !progress_))
<< "SaveProgress called before updates exhausted.";
application_results_.SaveProgress(conflict_progress, update_progress);
}
UpdateApplicator::ResultTracker::ResultTracker(size_t num_results) {
successful_ids_.reserve(num_results);
}
UpdateApplicator::ResultTracker::~ResultTracker() {
}
void UpdateApplicator::ResultTracker::AddConflict(syncable::Id id) {
conflicting_ids_.push_back(id);
}
void UpdateApplicator::ResultTracker::AddEncryptionConflict(syncable::Id id) {
encryption_conflict_ids_.push_back(id);
}
void UpdateApplicator::ResultTracker::AddSuccess(syncable::Id id) {
successful_ids_.push_back(id);
}
void UpdateApplicator::ResultTracker::SaveProgress(
sessions::ConflictProgress* conflict_progress,
sessions::UpdateProgress* update_progress) {
vector<syncable::Id>::const_iterator i;
for (i = conflicting_ids_.begin(); i != conflicting_ids_.end(); ++i) {
conflict_progress->AddConflictingItemById(*i);
update_progress->AddAppliedUpdate(CONFLICT, *i);
}
for (i = encryption_conflict_ids_.begin();
i != encryption_conflict_ids_.end(); ++i) {
// Encryption conflicts should not put the syncer into a stuck state. We
// mark as conflict, so that we reattempt to apply updates, but add it to
// the list of nonblocking conflicts instead of normal conflicts.
conflict_progress->AddNonblockingConflictingItemById(*i);
update_progress->AddAppliedUpdate(CONFLICT, *i);
}
for (i = successful_ids_.begin(); i != successful_ids_.end(); ++i) {
conflict_progress->EraseConflictingItemById(*i);
update_progress->AddAppliedUpdate(SUCCESS, *i);
}
}
void UpdateApplicator::ResultTracker::ClearConflicts() {
conflicting_ids_.clear();
encryption_conflict_ids_.clear();
}
bool UpdateApplicator::ResultTracker::no_conflicts() const {
return conflicting_ids_.empty();
}
} // namespace browser_sync
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