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// Copyright 2017 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 COMPONENTS_DOWNLOAD_INTERNAL_MODEL_H_
#define COMPONENTS_DOWNLOAD_INTERNAL_MODEL_H_
#include <memory>
#include <string>
#include <vector>
#include "components/download/public/clients.h"
namespace download {
struct Entry;
class Store;
// The model that contains a runtime representation of Entry entries. Any
// updates to the model will be persisted to a backing |Store| as necessary.
class Model {
public:
// The Client which is responsible for handling all relevant messages from the
// model.
class Client {
public:
virtual ~Client() = default;
// Called asynchronously in response to a Model::Initialize call. If
// |success| is |false|, initialization of the Model and/or the underlying
// Store failed. Initialization of the Model is complete after this
// callback. If |success| is true it can be accessed now.
virtual void OnInitialized(bool success) = 0;
// Called asynchronously in response to a Model::Destroy call. If |success|
// is |false|, destruction of the Model and/or the underlying Store failed.
// Destruction of the Model is effectively complete after this callback.
virtual void OnDestroyed(bool success) = 0;
// Called when an Entry addition is complete. |success| determines whether
// or not the entry has been successfully persisted to the Store.
virtual void OnItemAdded(bool success,
DownloadClient client,
const std::string& guid) = 0;
// Called when an Entry update is complete. |success| determines whether or
// not the update has been successfully persisted to the Store.
virtual void OnItemUpdated(bool success,
DownloadClient client,
const std::string& guid) = 0;
// Called when an Entry removal is complete. |success| determines whether
// or not the entry has been successfully removed from the Store.
virtual void OnItemRemoved(bool success,
DownloadClient client,
const std::string& guid) = 0;
};
using EntryList = std::vector<Entry*>;
virtual ~Model() = default;
// Initializes the Model. Client::OnInitialized() will be called in response.
// The Model can be used after that call.
virtual void Initialize() = 0;
// Destroys the Model. Client::OnDestroyed() will be called in response.
virtual void Destroy() = 0;
// Adds |entry| to this Model and attempts to write |entry| to the Store.
// Client::OnItemAdded() will be called in response asynchronously.
virtual void Add(const Entry& entry) = 0;
// Updates |entry| in this Model and attempts to write |entry| to the Store.
// Client::OnItemUpdated() will be called in response asynchronously.
virtual void Update(const Entry& entry) = 0;
// Removes the Entry specified by |guid| from this Model and attempts to
// remove that entry from the Store. Client::OnItemRemoved() will be called
// in response asynchronously.
virtual void Remove(const std::string& guid) = 0;
// Retrieves an Entry identified by |guid| or |nullptr| if no entry exists.
// IMPORTANT NOTE: The result of this method should be used immediately and
// NOT stored. The underlying data may get updated or removed by any other
// modifications to this model.
virtual Entry* Get(const std::string& guid) = 0;
// Returns a temporary list of Entry objects that this Model stores.
// IMPORTANT NOTE: Like Get(), the result of this method should be used
// immediately and NOT stored. The underlying data may get updated or removed
// by any other modifications to this model.
virtual EntryList PeekEntries() = 0;
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_INTERNAL_MODEL_H_
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