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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 CHROME_INSTALLER_UTIL_CALLBACK_WORK_ITEM_H_
#define CHROME_INSTALLER_UTIL_CALLBACK_WORK_ITEM_H_
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "chrome/installer/util/work_item.h"
// A work item that invokes a callback on Do() and Rollback(). In the following
// example, the function SomeWorkItemCallback() will be invoked when an item
// list is processed.
//
// // A callback invoked to do some work.
// bool SomeWorkItemCallback(const CallbackWorkItem& item) {
// if (item.IsRollback()) {
// // Rollback work goes here. The return value is ignored in this case.
// return true;
// }
//
// // Roll forward work goes here. The return value indicates success/failure
// // of the item.
// return true;
// }
//
// void SomeFunctionThatAddsItemsToAList(WorkItemList* item_list) {
// ...
// item_list->AddCallbackWorkItem(base::Bind(&SomeWorkItemCallback));
// ...
// }
class CallbackWorkItem : public WorkItem {
public:
virtual ~CallbackWorkItem();
virtual bool Do() OVERRIDE;
virtual void Rollback() OVERRIDE;
bool IsRollback() const;
private:
friend class WorkItem;
enum RollState {
RS_UNDEFINED,
RS_FORWARD,
RS_BACKWARD,
};
CallbackWorkItem(base::Callback<bool(const CallbackWorkItem&)> callback);
base::Callback<bool(const CallbackWorkItem&)> callback_;
RollState roll_state_;
FRIEND_TEST_ALL_PREFIXES(CallbackWorkItemTest, TestFailure);
FRIEND_TEST_ALL_PREFIXES(CallbackWorkItemTest, TestForwardBackward);
};
#endif // CHROME_INSTALLER_UTIL_CALLBACK_WORK_ITEM_H_
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