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// Copyright (c) 2012 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 "content/browser/webui/url_data_source_impl.h"
#include "base/bind.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/string_util.h"
#include "content/browser/webui/url_data_manager_backend.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/url_data_source.h"
namespace content {
URLDataSourceImpl::URLDataSourceImpl(const std::string& source_name,
URLDataSource* source)
: source_name_(source_name),
backend_(NULL),
source_(source) {
}
URLDataSourceImpl::~URLDataSourceImpl() {
}
void URLDataSourceImpl::SendResponse(
int request_id,
scoped_refptr<base::RefCountedMemory> bytes) {
if (URLDataManager::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;
}
BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
base::Bind(&URLDataSourceImpl::SendResponseOnIOThread,
this, request_id, std::move(bytes)));
}
void URLDataSourceImpl::SendResponseOnIOThread(
int request_id,
scoped_refptr<base::RefCountedMemory> bytes) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (backend_)
backend_->DataAvailable(request_id, bytes.get());
}
} // namespace content
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