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// 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.
#ifndef CHROME_BROWSER_POLICY_USER_POLICY_DISK_CACHE_H_
#define CHROME_BROWSER_POLICY_USER_POLICY_DISK_CACHE_H_
#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
namespace enterprise_management {
class CachedCloudPolicyResponse;
}
namespace policy {
// Handles the on-disk cache file used by UserPolicyCache. This class handles
// the necessary thread switching and may outlive the associated UserPolicyCache
// instance.
class UserPolicyDiskCache
: public base::RefCountedThreadSafe<UserPolicyDiskCache> {
public:
// Indicates the status of a completed load operation.
enum LoadResult {
// Policy was loaded successfully.
LOAD_RESULT_SUCCESS,
// Cache file missing.
LOAD_RESULT_NOT_FOUND,
// Failed to read cache file.
LOAD_RESULT_READ_ERROR,
// Failed to parse cache file.
LOAD_RESULT_PARSE_ERROR,
};
// Delegate interface for observing loads operations.
class Delegate {
public:
virtual ~Delegate();
virtual void OnDiskCacheLoaded(
LoadResult result,
const enterprise_management::CachedCloudPolicyResponse& policy) = 0;
};
UserPolicyDiskCache(const base::WeakPtr<Delegate>& delegate,
const base::FilePath& backing_file_path);
// Starts reading the policy cache from disk. Passes the read policy
// information back to the hosting UserPolicyCache after a successful cache
// load through UserPolicyCache::OnDiskCacheLoaded().
void Load();
// Triggers a write operation to the disk cache on the FILE thread.
void Store(const enterprise_management::CachedCloudPolicyResponse& policy);
private:
friend class base::RefCountedThreadSafe<UserPolicyDiskCache>;
~UserPolicyDiskCache();
// Tries to load the cache file on the FILE thread.
void LoadOnFileThread();
// Forwards the result to the UI thread.
void LoadDone(LoadResult result,
const enterprise_management::CachedCloudPolicyResponse& policy);
// Passes back the successfully read policy to the cache on the UI thread.
void ReportResultOnUIThread(
LoadResult result,
const enterprise_management::CachedCloudPolicyResponse& policy);
// Saves a policy blob on the FILE thread.
void StoreOnFileThread(
const enterprise_management::CachedCloudPolicyResponse& policy);
base::WeakPtr<Delegate> delegate_;
const base::FilePath backing_file_path_;
DISALLOW_COPY_AND_ASSIGN(UserPolicyDiskCache);
};
} // namespace policy
#endif // CHROME_BROWSER_POLICY_USER_POLICY_DISK_CACHE_H_
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