root/sync/api/attachments/fake_attachment_store.cc

DEFINITIONS

1. Read
2. Write
3. Drop
4. backend_task_runner_
5. Read
6. Write
7. Drop

// 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.

#include "sync/api/attachments/fake_attachment_store.h"

#include "base/bind.h"
#include "base/location.h"
#include "base/memory/ref_counted_memory.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/sequenced_task_runner.h"
#include "base/single_thread_task_runner.h"
#include "sync/api/attachments/attachment.h"

namespace syncer {

// Backend is where all the work happens.
class FakeAttachmentStore::Backend
    : public base::RefCountedThreadSafe<FakeAttachmentStore::Backend> {
 public:
  // Construct a Backend that posts its results to |frontend_task_runner|.
  Backend(
      const scoped_refptr<base::SingleThreadTaskRunner>& frontend_task_runner);

  void Read(const AttachmentId& id, const ReadCallback& callback);
  void Write(const scoped_refptr<base::RefCountedMemory>& bytes,
             const WriteCallback& callback);
  void Drop(const AttachmentId& id, const DropCallback& callback);

 private:
  friend class base::RefCountedThreadSafe<Backend>;

  ~Backend();

  scoped_refptr<base::SingleThreadTaskRunner> frontend_task_runner_;
  AttachmentMap attachments_;
};

FakeAttachmentStore::Backend::Backend(
    const scoped_refptr<base::SingleThreadTaskRunner>& frontend_task_runner)
    : frontend_task_runner_(frontend_task_runner) {}

FakeAttachmentStore::Backend::~Backend() {}

void FakeAttachmentStore::Backend::Read(const AttachmentId& id,
                                        const ReadCallback& callback) {
  AttachmentMap::iterator iter = attachments_.find(id);
  scoped_ptr<Attachment> attachment;
  Result result = NOT_FOUND;
  if (iter != attachments_.end()) {
    attachment.reset(new Attachment(iter->second));
    result = SUCCESS;
  }
  frontend_task_runner_->PostTask(
      FROM_HERE, base::Bind(callback, result, base::Passed(&attachment)));
}

void FakeAttachmentStore::Backend::Write(
    const scoped_refptr<base::RefCountedMemory>& bytes,
    const WriteCallback& callback) {
  Attachment attachment = Attachment::Create(bytes);
  AttachmentId attachment_id(attachment.GetId());
  attachments_.insert(AttachmentMap::value_type(attachment_id, attachment));
  frontend_task_runner_->PostTask(FROM_HERE,
                                  base::Bind(callback, SUCCESS, attachment_id));
}

void FakeAttachmentStore::Backend::Drop(const AttachmentId& id,
                                        const DropCallback& callback) {
  Result result = NOT_FOUND;
  AttachmentMap::iterator iter = attachments_.find(id);
  if (iter != attachments_.end()) {
    attachments_.erase(iter);
    result = SUCCESS;
  }
  frontend_task_runner_->PostTask(FROM_HERE, base::Bind(callback, result));
}

FakeAttachmentStore::FakeAttachmentStore(
    const scoped_refptr<base::SequencedTaskRunner>& backend_task_runner)
    : backend_(new Backend(base::MessageLoopProxy::current())),
      backend_task_runner_(backend_task_runner) {}

FakeAttachmentStore::~FakeAttachmentStore() {}

void FakeAttachmentStore::Read(const AttachmentId& id,
                               const ReadCallback& callback) {
  backend_task_runner_->PostTask(
      FROM_HERE,
      base::Bind(&FakeAttachmentStore::Backend::Read, backend_, id, callback));
}

void FakeAttachmentStore::Write(
    const scoped_refptr<base::RefCountedMemory>& bytes,
    const WriteCallback& callback) {
  backend_task_runner_->PostTask(
      FROM_HERE,
      base::Bind(
          &FakeAttachmentStore::Backend::Write, backend_, bytes, callback));
}

void FakeAttachmentStore::Drop(const AttachmentId& id,
                               const DropCallback& callback) {
  backend_task_runner_->PostTask(
      FROM_HERE,
      base::Bind(&FakeAttachmentStore::Backend::Drop, backend_, id, callback));
}

}  // namespace syncer