2nd try: FileAPI: Split recursive remove into multiple tasks.

webkit/fileapi/remove_operation_delegate.h

+// Copyright (c) 2013 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.
+
+#ifndef WEBKIT_FILEAPI_REMOVE_OPERATION_DELEGATE_H_
+#define WEBKIT_FILEAPI_REMOVE_OPERATION_DELEGATE_H_
+
+#include <queue>
+#include <stack>
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/memory/weak_ptr.h"
+#include "webkit/fileapi/file_system_operation.h"
+#include "webkit/fileapi/file_system_url.h"
+
+namespace fileapi {
+
+class FileSystemURL;
+class LocalFileSystemOperation;
+
+class RemoveOperationDelegate
+    : public base::SupportsWeakPtr<RemoveOperationDelegate> {
+ public:
+  typedef FileSystemOperation::StatusCallback StatusCallback;
+  typedef FileSystemOperation::FileEntryList FileEntryList;
+
+  RemoveOperationDelegate(LocalFileSystemOperation* original_operation,
+                          const StatusCallback& callback);
+  virtual ~RemoveOperationDelegate();
+
+  void Run(const FileSystemURL& url);
+  void RunRecursively(const FileSystemURL& url);
+
+ private:
+  void ProcessNextDirectory(base::PlatformFileError error);
+  void DidTryRemoveFile(
+      const FileSystemURL& url,
+      base::PlatformFileError error);
+  void DidReadDirectory(
+      const FileSystemURL& parent,
+      base::PlatformFileError error,
+      const FileEntryList& entries,
+      bool has_more);
+  void RemoveFile(const FileSystemURL& url);
+  void DidRemoveFile(base::PlatformFileError error);
+  void RemoveNextDirectory(base::PlatformFileError error);
+
+  LocalFileSystemOperation* NewOperation(const FileSystemURL& url);
+
+  LocalFileSystemOperation* original_operation_;
+  StatusCallback callback_;
+
+  std::queue<FileSystemURL> pending_directories_;
+  std::stack<FileSystemURL> to_remove_directories_;
+
+  int inflight_operations_;
+
+  DISALLOW_COPY_AND_ASSIGN(RemoveOperationDelegate);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_REMOVE_OPERATION_DELEGATE_H_