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// Copyright (c) 2011 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 CHROME_BROWSER_POLICY_FILE_BASED_POLICY_LOADER_H_
#define CHROME_BROWSER_POLICY_FILE_BASED_POLICY_LOADER_H_
#pragma once
#include "base/compiler_specific.h"
#include "base/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/time.h"
#include "chrome/browser/policy/asynchronous_policy_loader.h"
#include "chrome/browser/policy/file_based_policy_provider.h"
namespace base {
namespace files {
class FilePathWatcher;
} // namespace files
} // namespace base
namespace policy {
// A customized asynchronous policy loader that handles loading policy from a
// file using a FilePathWatcher. The loader creates a fallback task to load
// policy periodically in case the watcher fails and retries policy loads when
// the watched file is in flux.
class FileBasedPolicyLoader : public AsynchronousPolicyLoader {
public:
explicit FileBasedPolicyLoader(
FileBasedPolicyProvider::ProviderDelegate* provider_delegate);
// AsynchronousPolicyLoader overrides:
virtual void Reload(bool force) OVERRIDE;
void OnFilePathChanged(const FilePath& path);
void OnFilePathError(const FilePath& path);
protected:
// FileBasedPolicyLoader objects should only be deleted by
// RefCountedThreadSafe.
friend class base::RefCountedThreadSafe<AsynchronousPolicyLoader>;
virtual ~FileBasedPolicyLoader();
const FilePath& config_file_path() { return config_file_path_; }
// AsynchronousPolicyLoader overrides:
// Creates the file path watcher and configures it to watch
// |config_file_path_|. Must be called on the file thread.
virtual void InitOnFileThread() OVERRIDE;
virtual void StopOnFileThread() OVERRIDE;
private:
// Checks whether policy information is safe to read. If not, returns false
// and then delays until it is considered safe to reload in |delay|.
// Must be called on the file thread.
bool IsSafeToReloadPolicy(const base::Time& now, base::TimeDelta* delay);
// The path at which we look for configuration files.
const FilePath config_file_path_;
// Managed with a scoped_ptr rather than being declared as an inline member to
// decouple the watcher's life cycle from the loader's. This decoupling makes
// it possible to destroy the watcher before the loader's destructor is called
// (e.g. during Stop), since |watcher_| internally holds a reference to the
// loader and keeps it alive.
scoped_ptr<base::files::FilePathWatcher> watcher_;
// Settle interval.
const base::TimeDelta settle_interval_;
// Records last known modification timestamp of |config_file_path_|.
base::Time last_modification_file_;
// The wall clock time at which the last modification timestamp was
// recorded. It's better to not assume the file notification time and the
// wall clock times come from the same source, just in case there is some
// non-local filesystem involved.
base::Time last_modification_clock_;
DISALLOW_COPY_AND_ASSIGN(FileBasedPolicyLoader);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_FILE_BASED_POLICY_LOADER_H_
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