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// Copyright 2013 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 STORAGE_BROWSER_QUOTA_QUOTA_CALLBACKS_H_
#define STORAGE_BROWSER_QUOTA_QUOTA_CALLBACKS_H_
#include <map>
#include <set>
#include <vector>
#include "base/basictypes.h"
#include "base/callback.h"
#include "storage/common/quota/quota_status_code.h"
#include "storage/common/quota/quota_types.h"
class GURL;
namespace storage {
struct UsageInfo;
typedef std::vector<UsageInfo> UsageInfoEntries;
// Common callback types that are used throughout in the quota module.
typedef base::Callback<void(int64 usage,
int64 unlimited_usage)> GlobalUsageCallback;
typedef base::Callback<void(QuotaStatusCode status, int64 quota)> QuotaCallback;
typedef base::Callback<void(int64 usage)> UsageCallback;
typedef base::Callback<void(QuotaStatusCode, int64)> AvailableSpaceCallback;
typedef base::Callback<void(QuotaStatusCode)> StatusCallback;
typedef base::Callback<void(const std::set<GURL>& origins,
StorageType type)> GetOriginsCallback;
typedef base::Callback<void(const UsageInfoEntries&)> GetUsageInfoCallback;
typedef base::Callback<void(const GURL&)> GetOriginCallback;
// Simple template wrapper for a callback queue.
template <typename CallbackType, typename... Args>
class CallbackQueue {
public:
// Returns true if the given |callback| is the first one added to the queue.
bool Add(const CallbackType& callback) {
callbacks_.push_back(callback);
return (callbacks_.size() == 1);
}
bool HasCallbacks() const {
return !callbacks_.empty();
}
// Runs the callbacks added to the queue and clears the queue.
void Run(
typename base::internal::CallbackParamTraits<Args>::ForwardType... args) {
std::vector<CallbackType> callbacks;
callbacks.swap(callbacks_);
for (const auto& callback : callbacks)
callback.Run(base::internal::CallbackForward(args)...);
}
void Swap(CallbackQueue<CallbackType, Args...>* other) {
callbacks_.swap(other->callbacks_);
}
size_t size() const {
return callbacks_.size();
}
private:
std::vector<CallbackType> callbacks_;
};
template <typename CallbackType, typename Key, typename... Args>
class CallbackQueueMap {
public:
typedef CallbackQueue<CallbackType, Args...> CallbackQueueType;
typedef std::map<Key, CallbackQueueType> CallbackMap;
typedef typename CallbackMap::iterator iterator;
bool Add(const Key& key, const CallbackType& callback) {
return callback_map_[key].Add(callback);
}
bool HasCallbacks(const Key& key) const {
return (callback_map_.find(key) != callback_map_.end());
}
bool HasAnyCallbacks() const {
return !callback_map_.empty();
}
iterator Begin() { return callback_map_.begin(); }
iterator End() { return callback_map_.end(); }
void Clear() { callback_map_.clear(); }
// Runs the callbacks added for the given |key| and clears the key
// from the map.
void Run(
const Key& key,
typename base::internal::CallbackParamTraits<Args>::ForwardType... args) {
if (!this->HasCallbacks(key))
return;
CallbackQueueType queue;
queue.Swap(&callback_map_[key]);
callback_map_.erase(key);
queue.Run(base::internal::CallbackForward(args)...);
}
private:
CallbackMap callback_map_;
};
} // namespace storage
#endif // STORAGE_QUOTA_QUOTA_TYPES_H_
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