Add LocalFileSyncContext class which wires up profile-owned service and FileSystemContext(s)

webkit/fileapi/syncable/local_file_sync_context.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 "webkit/fileapi/syncable/local_file_sync_context.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/stl_util.h"
+#include "base/task_runner_util.h"
+#include "webkit/fileapi/file_system_context.h"
+#include "webkit/fileapi/file_system_task_runners.h"
+#include "webkit/fileapi/syncable/local_file_change_tracker.h"
+
+namespace fileapi {
+
+LocalFileSyncContext::LocalFileSyncContext(
+    base::SingleThreadTaskRunner* ui_task_runner,
+    base::SingleThreadTaskRunner* io_task_runner)
+    : ui_task_runner_(ui_task_runner),
+      io_task_runner_(io_task_runner),
+      shutdown_(false) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+}
+
+void LocalFileSyncContext::MaybeInitializeFileSystemContext(
+    const GURL& source_url,
+    FileSystemContext* file_system_context,
+    const StatusCallback& callback) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  if (ContainsKey(file_system_contexts_, file_system_context)) {
+    DCHECK(!ContainsKey(origin_to_contexts_, source_url) ||
+           origin_to_contexts_[source_url] == file_system_context);
+    origin_to_contexts_[source_url] = file_system_context;
+    // The context has been already initialized. Just dispatch the callback
+    // with SYNC_STATUS_OK.
+    ui_task_runner_->PostTask(FROM_HERE, base::Bind(callback, SYNC_STATUS_OK));
+    return;
+  }
+
+  StatusCallbackQueue& callback_queue =
+      pending_initialize_callbacks_[file_system_context];
+  callback_queue.push_back(callback);
+  if (callback_queue.size() > 1)
+    return;
+
+  io_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&LocalFileSyncContext::InitializeFileSystemContextOnIOThread,
+                 this, source_url, make_scoped_refptr(file_system_context)));
+}
+
+void LocalFileSyncContext::ShutdownOnUIThread() {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  shutdown_ = true;
+  io_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&LocalFileSyncContext::ShutdownOnIOThread,
+                 this));
+}
+
+LocalFileSyncContext::~LocalFileSyncContext() {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  DCHECK(shutdown_);
+}
+
+void LocalFileSyncContext::ShutdownOnIOThread() {
+  DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
+}
+
+void LocalFileSyncContext::InitializeFileSystemContextOnIOThread(
+    const GURL& source_url,
+    FileSystemContext* file_system_context) {
+  DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
+  DCHECK(file_system_context);
+  if (!file_system_context->change_tracker()) {
+    // Create and initialize LocalFileChangeTracker and call back this method
+    // later again.
+    scoped_ptr<LocalFileChangeTracker>* tracker_ptr(
+        new scoped_ptr<LocalFileChangeTracker>);
+    base::PostTaskAndReplyWithResult(
+        file_system_context->task_runners()->file_task_runner(),
+        FROM_HERE,
+        base::Bind(&LocalFileSyncContext::InitializeChangeTrackerOnFileThread,
+                   this, tracker_ptr,
+                   make_scoped_refptr(file_system_context)),
+        base::Bind(&LocalFileSyncContext::DidInitializeChangeTracker, this,
+                   base::Owned(tracker_ptr),
+                   source_url,
+                   make_scoped_refptr(file_system_context)));
+    return;
+  }
+  file_system_context->set_sync_context(this);
+  DidInitialize(source_url, file_system_context, SYNC_STATUS_OK);
+}
+
+SyncStatusCode LocalFileSyncContext::InitializeChangeTrackerOnFileThread(
+    scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
+    FileSystemContext* file_system_context) {
+  DCHECK(file_system_context);
+  DCHECK(tracker_ptr);
+  tracker_ptr->reset(new LocalFileChangeTracker(
+          file_system_context->partition_path(),
+          file_system_context->task_runners()->file_task_runner()));
+  // TODO(kinuko,nhiroki): Uncomment this once http://crbug.com/154028 is fixed.
+  // return change_tracker->Initialize(file_system_context);
+  return SYNC_STATUS_OK;
+}
+
+void LocalFileSyncContext::DidInitializeChangeTracker(
+    scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
+    const GURL& source_url,
+    FileSystemContext* file_system_context,
+    SyncStatusCode status) {
+  DCHECK(file_system_context);
+  if (status != SYNC_STATUS_OK) {
+    DidInitialize(source_url, file_system_context, status);
+    return;
+  }
+  file_system_context->SetLocalFileChangeTracker(tracker_ptr->Pass());
+  InitializeFileSystemContextOnIOThread(source_url, file_system_context);
+}
+
+void LocalFileSyncContext::DidInitialize(
+    const GURL& source_url,
+    FileSystemContext* file_system_context,
+    SyncStatusCode status) {
+  if (!ui_task_runner_->RunsTasksOnCurrentThread()) {
+    ui_task_runner_->PostTask(
+        FROM_HERE,
+        base::Bind(&LocalFileSyncContext::DidInitialize,
+                   this, source_url,
+                   make_scoped_refptr(file_system_context), status));
+    return;
+  }
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  DCHECK(!ContainsKey(file_system_contexts_, file_system_context));
+  DCHECK(ContainsKey(pending_initialize_callbacks_, file_system_context));
+  DCHECK(file_system_context->change_tracker());
+
+  file_system_contexts_.insert(file_system_context);
+
+  DCHECK(!ContainsKey(origin_to_contexts_, source_url));
+  origin_to_contexts_[source_url] = file_system_context;
+
+  StatusCallbackQueue& callback_queue =
+      pending_initialize_callbacks_[file_system_context];
+  for (StatusCallbackQueue::iterator iter = callback_queue.begin();
+       iter != callback_queue.end(); ++iter) {
+    ui_task_runner_->PostTask(FROM_HERE, base::Bind(*iter, status));
+  }
+  pending_initialize_callbacks_.erase(file_system_context);
+}
+
+}  // namespace fileapi