blob: 8e9836cac2f92c67a6fc23a8bddb4e5fc9e03621 [file] [log] [blame]
// 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 "ios/web/webui/url_data_source_ios_impl.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/string_util.h"
#include "base/task/post_task.h"
#include "ios/web/public/thread/web_task_traits.h"
#include "ios/web/public/thread/web_thread.h"
#include "ios/web/public/webui/url_data_source_ios.h"
#include "ios/web/webui/url_data_manager_ios_backend.h"
namespace web {
URLDataSourceIOSImpl::URLDataSourceIOSImpl(const std::string& source_name,
URLDataSourceIOS* source)
: source_name_(source_name), backend_(NULL), source_(source) {
}
URLDataSourceIOSImpl::~URLDataSourceIOSImpl() {
}
void URLDataSourceIOSImpl::SendResponse(
int request_id,
scoped_refptr<base::RefCountedMemory> bytes) {
// Take a ref-pointer on entry so byte->Release() will always get called.
if (URLDataManagerIOS::IsScheduledForDeletion(this)) {
// We're scheduled for deletion. Servicing the request would result in
// this->AddRef being invoked, even though the ref count is 0 and 'this' is
// about to be deleted. If the AddRef were allowed through, when 'this' is
// released it would be deleted again.
//
// This scenario occurs with DataSources that make history requests. Such
// DataSources do a history query in |StartDataRequest| and the request is
// live until the object is deleted (history requests don't up the ref
// count). This means it's entirely possible for the DataSource to invoke
// |SendResponse| between the time when there are no more refs and the time
// when the object is deleted.
return;
}
base::PostTaskWithTraits(
FROM_HERE, {web::WebThread::IO},
base::BindOnce(&URLDataSourceIOSImpl::SendResponseOnIOThread, this,
request_id, std::move(bytes)));
}
void URLDataSourceIOSImpl::SendResponseOnIOThread(
int request_id,
scoped_refptr<base::RefCountedMemory> bytes) {
DCHECK_CURRENTLY_ON(web::WebThread::IO);
if (backend_)
backend_->DataAvailable(request_id, bytes.get());
}
const ui::TemplateReplacements* URLDataSourceIOSImpl::GetReplacements() const {
return nullptr;
}
} // namespace web