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// Copyright 2014 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_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_
#define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequenced_task_runner.h"
#include "base/task_runner.h"
#include "sync/api/attachments/attachment.h"
#include "sync/base/sync_export.h"
#include "sync/internal_api/public/attachments/attachment_service.h"
namespace syncer {
// AttachmentServiceProxy wraps an AttachmentService allowing multiple threads
// to share the wrapped AttachmentService and invoke its methods in the
// appropriate thread.
//
// Callbacks passed to methods on this class will be invoked in the same thread
// from which the method was called.
//
// This class does not own its wrapped AttachmentService object. This class
// holds a WeakPtr to the wrapped object. Once the the wrapped object is
// destroyed, method calls on this object will be no-ops.
//
// Users of this class should take care to destroy the wrapped object on the
// correct thread (wrapped_task_runner).
//
// This class is thread-safe and is designed to be passed by const-ref.
class SYNC_EXPORT AttachmentServiceProxy : public AttachmentService {
public:
// Default copy and assignment are welcome.
// Construct an invalid AttachmentServiceProxy.
AttachmentServiceProxy();
// Construct an AttachmentServiceProxy that forwards calls to |wrapped| on the
// |wrapped_task_runner| thread.
//
// Note, this object does not own |wrapped|. When |wrapped| is destroyed,
// calls to this object become no-ops.
AttachmentServiceProxy(
const scoped_refptr<base::SequencedTaskRunner>& wrapped_task_runner,
const base::WeakPtr<syncer::AttachmentService>& wrapped);
~AttachmentServiceProxy() override;
void GetOrDownloadAttachments(const AttachmentIdList& attachment_ids,
const GetOrDownloadCallback& callback) override;
void UploadAttachments(const AttachmentIdList& attachment_ids) override;
protected:
// Core does the work of proxying calls to AttachmentService methods from one
// thread to another so AttachmentServiceProxy can be an easy-to-use,
// non-ref-counted A ref-counted class.
//
// Callback from AttachmentService are proxied back using free functions
// defined in the .cc file (ProxyFooCallback functions).
//
// Core is ref-counted because we want to allow AttachmentServiceProxy to be
// copy-constructable while allowing for different implementations of Core
// (e.g. one type of core might own the wrapped AttachmentService).
//
// Calls to objects of this class become no-ops once its wrapped object is
// destroyed.
class SYNC_EXPORT Core : public AttachmentService,
public base::RefCountedThreadSafe<Core> {
public:
// Construct an AttachmentServiceProxyCore that forwards calls to |wrapped|.
explicit Core(const base::WeakPtr<syncer::AttachmentService>& wrapped);
// AttachmentService implementation.
void GetOrDownloadAttachments(
const AttachmentIdList& attachment_ids,
const GetOrDownloadCallback& callback) override;
void UploadAttachments(const AttachmentIdList& attachment_ids) override;
protected:
~Core() override;
private:
friend class base::RefCountedThreadSafe<Core>;
base::WeakPtr<AttachmentService> wrapped_;
DISALLOW_COPY_AND_ASSIGN(Core);
};
// Used in tests to create an AttachmentServiceProxy with a custom Core.
AttachmentServiceProxy(
const scoped_refptr<base::SequencedTaskRunner>& wrapped_task_runner,
const scoped_refptr<Core>& core);
private:
scoped_refptr<base::SequencedTaskRunner> wrapped_task_runner_;
scoped_refptr<Core> core_;
};
} // namespace syncer
#endif // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_
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