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47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef IOS_CHROME_BROWSER_CALLBACK_COUNTER_H_
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#define IOS_CHROME_BROWSER_CALLBACK_COUNTER_H_
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#include "base/callback.h"
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#include "base/logging.h"
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#include "base/memory/ref_counted.h"
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#include "base/threading/thread.h"
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// A helper class that keeps count of the number of pending callbacks that need
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// to be received. Calls |final_callback| when all callbacks have been received.
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// All methods (except the destructor) must be called on the same thread.
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class CallbackCounter : public base::RefCounted<CallbackCounter> {
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public:
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typedef base::Callback<void()> FinalCallback;
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explicit CallbackCounter(const FinalCallback& final_callback);
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// Increments the count of pending callbacks by |count| .
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void IncrementCount(int count);
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// Increments the count of pending callbacks by 1.
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void IncrementCount();
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// Decrements the count of pending callbacks.
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void DecrementCount();
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private:
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friend class base::RefCounted<CallbackCounter>;
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~CallbackCounter();
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// The number of callbacks that still need to be received.
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unsigned callback_count_;
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// The callback that is finally called when all callbacks have been received
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// (when the |callback_count_| goes down to 0).
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FinalCallback final_callback_;
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base::ThreadChecker thread_checker_;
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DISALLOW_COPY_AND_ASSIGN(CallbackCounter);
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};
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#endif // IOS_CHROME_BROWSER_CALLBACK_COUNTER_H_
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