[fsp] Add requestUnmount() method together with the request manager.

chrome/browser/chromeos/file_system_provider/request_manager.cc

+// 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 "chrome/browser/chromeos/file_system_provider/request_manager.h"
+
+#include "base/values.h"
+
+namespace chromeos {
+namespace file_system_provider {
+
+RequestManager::RequestManager() : next_id_(1) {}
+
+RequestManager::~RequestManager() {}
+
+int RequestManager::CreateRequest(const ProvidedFileSystem& file_system,
+                                  const SuccessCallback& success_callback,
+                                  const ErrorCallback& error_callback) {
+  // The request id is unique per request manager, so per service, thereof
+  // per profile.
+  int request_id = next_id_++;
+
+  // If cycled the int, then signal an error.
+  if (requests_.find(request_id) != requests_.end())
+    return 0;
+
+  Request request;
+  request.file_system = file_system;
+  request.success_callback = success_callback;
+  request.error_callback = error_callback;
+  requests_[request_id] = request;
+
+  return request_id;
+}
+
+bool RequestManager::FulfillRequest(const ProvidedFileSystem& file_system,
+                                    int request_id,
+                                    scoped_ptr<base::DictionaryValue> response,
+                                    bool has_next) {
+  RequestMap::iterator request_it = requests_.find(request_id);
+
+  if (request_it == requests_.end())
+    return false;
+
+  // Check if the request belongs to the same provided file system.
+  if (request_it->second.file_system.file_system_id() !=
+      file_system.file_system_id()) {
+    return false;
+  }
+
+  if (!request_it->second.success_callback.is_null())
+    request_it->second.success_callback.Run(response.Pass(), has_next);
+  if (!has_next)
+    requests_.erase(request_it);
+
+  return true;
+}
+
+bool RequestManager::RejectRequest(const ProvidedFileSystem& file_system,
+                                   int request_id,
+                                   base::File::Error error) {
+  RequestMap::iterator request_it = requests_.find(request_id);
+
+  if (request_it == requests_.end())
+    return false;
+
+  // Check if the request belongs to the same provided file system.
+  if (request_it->second.file_system.file_system_id() !=
+      file_system.file_system_id()) {
+    return false;
+  }
+
+  if (!request_it->second.error_callback.is_null())
+    request_it->second.error_callback.Run(error);
+  requests_.erase(request_it);
+
+  return true;
+}
+
+void RequestManager::OnProvidedFileSystemMount(
+    const ProvidedFileSystem& file_system,
+    base::File::Error error) {}
+
+void RequestManager::OnProvidedFileSystemUnmount(
+    const ProvidedFileSystem& file_system,
+    base::File::Error error) {
+  // Do not continue on error, since the volume may be still mounted.
+  if (error != base::File::FILE_OK)
+    return;
+
+  // Remove all requests for this provided file system.
+  RequestMap::iterator it = requests_.begin();
+  while (it != requests_.begin()) {
+    if (it->second.file_system.file_system_id() ==
+        file_system.file_system_id()) {
+      RejectRequest(
+          it->second.file_system, it->first, base::File::FILE_ERROR_ABORT);
+      requests_.erase(it++);
+    } else {
+      it++;
+    }
+  }
+}
+
+RequestManager::Request::Request() {}
+
+RequestManager::Request::~Request() {}
+
+}  // namespace file_system_provider
+}  // namespace chromeos