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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.
#ifndef SYNC_ENGINE_SYNCER_H_
#define SYNC_ENGINE_SYNCER_H_
#include <utility>
#include <vector>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/gtest_prod_util.h"
#include "base/synchronization/lock.h"
#include "sync/base/sync_export.h"
#include "sync/engine/conflict_resolver.h"
#include "sync/engine/syncer_types.h"
#include "sync/internal_api/public/base/model_type.h"
#include "sync/sessions/sync_session.h"
#include "sync/util/extensions_activity_monitor.h"
namespace syncer {
// A Syncer provides a control interface for driving the individual steps
// of the sync cycle. Each cycle (hopefully) moves the client into closer
// synchronization with the server. The individual steps are modeled
// as SyncerCommands, and the ordering of the steps is expressed using
// the SyncerStep enum.
//
// A Syncer instance expects to run on a dedicated thread. Calls
// to SyncShare() may take an unbounded amount of time, as SyncerCommands
// may block on network i/o, on lock contention, or on tasks posted to
// other threads.
class SYNC_EXPORT_PRIVATE Syncer {
public:
typedef std::vector<int64> UnsyncedMetaHandles;
Syncer();
virtual ~Syncer();
// Called by other threads to tell the syncer to stop what it's doing
// and return early from SyncShare, if possible.
bool ExitRequested();
void RequestEarlyExit();
virtual bool NormalSyncShare(ModelTypeSet request_types,
const sessions::NudgeTracker& nudge_tracker,
sessions::SyncSession* session);
virtual bool ConfigureSyncShare(ModelTypeSet request_types,
sessions::SyncSession* session);
virtual bool PollSyncShare(ModelTypeSet request_types,
sessions::SyncSession* session);
private:
void ApplyUpdates(sessions::SyncSession* session);
bool DownloadAndApplyUpdates(
sessions::SyncSession* session,
base::Callback<SyncerError(void)> download_fn);
void HandleCycleBegin(sessions::SyncSession* session);
bool HandleCycleEnd(sessions::SyncSession* session);
bool early_exit_requested_;
base::Lock early_exit_requested_lock_;
friend class SyncerTest;
FRIEND_TEST_ALL_PREFIXES(SyncerTest, NameClashWithResolver);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, IllegalAndLegalUpdates);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, TestCommitListOrderingAndNewParent);
FRIEND_TEST_ALL_PREFIXES(SyncerTest,
TestCommitListOrderingAndNewParentAndChild);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, TestCommitListOrderingCounterexample);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, TestCommitListOrderingWithNesting);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, TestCommitListOrderingWithNewItems);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, TestGetUnsyncedAndSimpleCommit);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, TestPurgeWhileUnsynced);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, TestPurgeWhileUnapplied);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, UnappliedUpdateDuringCommit);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, DeletingEntryInFolder);
FRIEND_TEST_ALL_PREFIXES(SyncerTest,
LongChangelistCreatesFakeOrphanedEntries);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, QuicklyMergeDualCreatedHierarchy);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, LongChangelistWithApplicationConflict);
FRIEND_TEST_ALL_PREFIXES(SyncerTest, DeletingEntryWithLocalEdits);
FRIEND_TEST_ALL_PREFIXES(EntryCreatedInNewFolderTest,
EntryCreatedInNewFolderMidSync);
DISALLOW_COPY_AND_ASSIGN(Syncer);
};
} // namespace syncer
#endif // SYNC_ENGINE_SYNCER_H_
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