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// Copyright 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_COMMAND_H_
#define SYNC_ENGINE_SYNCER_COMMAND_H_
#include "base/basictypes.h"
#include "sync/base/sync_export.h"
#include "sync/internal_api/public/util/syncer_error.h"
namespace syncer {
namespace sessions {
class SyncSession;
}
// Implementation of a simple command pattern intended to be driven by the
// Syncer. SyncerCommand is abstract and all subclasses must implement
// ExecuteImpl(). This is done so that chunks of syncer operation can be unit
// tested.
//
// Example Usage:
//
// SyncSession session = ...;
// SyncerCommand *cmd = SomeCommandFactory.createCommand(...);
// cmd->Execute(session);
// delete cmd;
class SYNC_EXPORT_PRIVATE SyncerCommand {
public:
SyncerCommand();
virtual ~SyncerCommand();
// Execute dispatches to a derived class's ExecuteImpl.
SyncerError Execute(sessions::SyncSession* session);
// ExecuteImpl is where derived classes actually do work.
virtual SyncerError ExecuteImpl(sessions::SyncSession* session) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(SyncerCommand);
};
} // namespace syncer
#endif // SYNC_ENGINE_SYNCER_COMMAND_H_
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