Move core url data manager classes to content.

chrome/browser/ui/webui/chrome_url_data_manager.cc

-// 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 "chrome/browser/ui/webui/chrome_url_data_manager.h"
-
-#include <vector>
-
-#include "base/bind.h"
-#include "base/lazy_instance.h"
-#include "base/memory/ref_counted_memory.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
-#include "base/string_util.h"
-#include "base/synchronization/lock.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/webui/chrome_url_data_manager_factory.h"
-#include "chrome/browser/ui/webui/chrome_url_data_manager_backend.h"
-#include "chrome/browser/ui/webui/chrome_web_ui_data_source.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/url_data_source.h"
-
-using content::BrowserThread;
-
-static base::LazyInstance<base::Lock>::Leaky
-    g_delete_lock = LAZY_INSTANCE_INITIALIZER;
-
-// static
-ChromeURLDataManager::URLDataSources* ChromeURLDataManager::data_sources_ =
-    NULL;
-
-// Invoked on the IO thread to do the actual adding of the DataSource.
-static void AddDataSourceOnIOThread(
-    const base::Callback<ChromeURLDataManagerBackend*(void)>& backend,
-    scoped_refptr<URLDataSourceImpl> data_source) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  backend.Run()->AddDataSource(data_source.get());
-}
-
-ChromeURLDataManager::ChromeURLDataManager(
-      const base::Callback<ChromeURLDataManagerBackend*(void)>& backend)
-    : backend_(backend) {
-}
-
-ChromeURLDataManager::~ChromeURLDataManager() {
-}
-
-void ChromeURLDataManager::AddDataSource(URLDataSourceImpl* source) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  BrowserThread::PostTask(
-      BrowserThread::IO, FROM_HERE,
-      base::Bind(&AddDataSourceOnIOThread,
-                 backend_, make_scoped_refptr(source)));
-}
-
-// static
-void ChromeURLDataManager::DeleteDataSources() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  URLDataSources sources;
-  {
-    base::AutoLock lock(g_delete_lock.Get());
-    if (!data_sources_)
-      return;
-    data_sources_->swap(sources);
-  }
-  for (size_t i = 0; i < sources.size(); ++i)
-    delete sources[i];
-}
-
-// static
-void ChromeURLDataManager::DeleteDataSource(
-    const URLDataSourceImpl* data_source) {
-  // Invoked when a DataSource is no longer referenced and needs to be deleted.
-  if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
-    // We're on the UI thread, delete right away.
-    delete data_source;
-    return;
-  }
-
-  // We're not on the UI thread, add the DataSource to the list of DataSources
-  // to delete.
-  bool schedule_delete = false;
-  {
-    base::AutoLock lock(g_delete_lock.Get());
-    if (!data_sources_)
-      data_sources_ = new URLDataSources();
-    schedule_delete = data_sources_->empty();
-    data_sources_->push_back(data_source);
-  }
-  if (schedule_delete) {
-    // Schedule a task to delete the DataSource back on the UI thread.
-    BrowserThread::PostTask(
-        BrowserThread::UI, FROM_HERE,
-        base::Bind(&ChromeURLDataManager::DeleteDataSources));
-  }
-}
-
-// static
-void ChromeURLDataManager::AddDataSource(
-    Profile* profile,
-    content::URLDataSource* source) {
-  ChromeURLDataManagerFactory::GetForProfile(profile)->AddDataSource(
-      new URLDataSourceImpl(source->GetSource(), source));
-}
-
-// static
-void ChromeURLDataManager::AddWebUIDataSource(
-    Profile* profile,
-    content::WebUIDataSource* source) {
-  ChromeWebUIDataSource* impl = static_cast<ChromeWebUIDataSource*>(source);
-  ChromeURLDataManagerFactory::GetForProfile(profile)->AddDataSource(impl);
-}
-
-// static
-bool ChromeURLDataManager::IsScheduledForDeletion(
-    const URLDataSourceImpl* data_source) {
-  base::AutoLock lock(g_delete_lock.Get());
-  if (!data_sources_)
-    return false;
-  return std::find(data_sources_->begin(), data_sources_->end(), data_source) !=
-      data_sources_->end();
-}
-
-URLDataSourceImpl::URLDataSourceImpl(const std::string& source_name,
-                                     content::URLDataSource* source)
-    : source_name_(source_name),
-      backend_(NULL),
-      source_(source) {
-}
-
-URLDataSourceImpl::~URLDataSourceImpl() {
-}
-
-void URLDataSourceImpl::SendResponse(
-    int request_id,
-    base::RefCountedMemory* bytes) {
-  // Take a ref-pointer on entry so byte->Release() will always get called.
-  scoped_refptr<base::RefCountedMemory> bytes_ptr(bytes);
-  if (ChromeURLDataManager::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,
-                 bytes_ptr));
-}
-
-void URLDataSourceImpl::SendResponseOnIOThread(
-    int request_id,
-    scoped_refptr<base::RefCountedMemory> bytes) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  if (backend_)
-    backend_->DataAvailable(request_id, bytes);
-}