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// 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/cleanup_disabled_types_command.h"
#include <algorithm>
#include "sync/internal_api/public/syncable/model_type.h"
#include "sync/sessions/sync_session.h"
#include "sync/sessions/sync_session_context.h"
#include "sync/syncable/syncable.h"
namespace browser_sync {
CleanupDisabledTypesCommand::CleanupDisabledTypesCommand() {}
CleanupDisabledTypesCommand::~CleanupDisabledTypesCommand() {}
SyncerError CleanupDisabledTypesCommand::ExecuteImpl(
sessions::SyncSession* session) {
using syncable::ModelTypeSet;
using syncable::ModelTypeSetToString;
// Because a full directory purge is slow, we avoid purging
// undesired types unless we have reason to believe they were
// previously enabled. Because purging could theoretically fail on
// the first sync session (when there's no previous routing info) we
// pay the full directory scan price once and do a "deep clean" of
// types that may potentially need cleanup so that we converge to
// the correct state.
//
// in_previous | !in_previous
// |
// initial_sync_ended should clean | may have attempted cleanup
// !initial_sync_ended should clean | may have never been enabled, or
// | could have been disabled before
// | initial sync ended and cleanup
// | may not have happened yet
// | (failure, browser restart
// | before another sync session,..)
const ModelTypeSet enabled_types =
GetRoutingInfoTypes(session->routing_info());
const ModelTypeSet previous_enabled_types =
GetRoutingInfoTypes(
session->context()->previous_session_routing_info());
ModelTypeSet to_cleanup = Difference(ModelTypeSet::All(), enabled_types);
// If |previous_enabled_types| is non-empty (i.e., not the first
// sync session), set |to_cleanup| to its intersection with
// |previous_enabled_types|.
if (!previous_enabled_types.Empty()) {
to_cleanup.RetainAll(previous_enabled_types);
}
DVLOG(1) << "enabled_types = " << ModelTypeSetToString(enabled_types)
<< ", previous_enabled_types = "
<< ModelTypeSetToString(previous_enabled_types)
<< ", to_cleanup = " << ModelTypeSetToString(to_cleanup);
if (to_cleanup.Empty())
return SYNCER_OK;
session->context()->directory()->PurgeEntriesWithTypeIn(to_cleanup);
return SYNCER_OK;
}
} // namespace browser_sync
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