/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef CacheObserver__h__

#define CacheObserver__h__

#include "nsIObserver.h"

#include "nsIFile.h"

#include "nsCOMPtr.h"

#include "nsWeakReference.h"

#include <algorithm>

namespace mozilla {

namespace net {

class CacheObserver : public nsIObserver

                    , public nsSupportsWeakReference

{

  virtual ~CacheObserver() = default;

  NS_DECL_THREADSAFE_ISUPPORTS

  NS_DECL_NSIOBSERVER

  static nsresult Init();

  static nsresult Shutdown();

  static CacheObserver* Self() { return sSelf; }

  // Access to preferences

  static bool UseDiskCache()

    { return sUseDiskCache; }

  static bool UseMemoryCache()

    { return sUseMemoryCache; }

  static uint32_t MetadataMemoryLimit() // result in bytes.

    { return sMetadataMemoryLimit << 10; }

  static uint32_t MemoryCacheCapacity(); // result in bytes.

  static uint32_t DiskCacheCapacity() // result in bytes.

    { return sDiskCacheCapacity << 10; }

  static void SetDiskCacheCapacity(uint32_t); // parameter in bytes.

  static uint32_t DiskFreeSpaceSoftLimit() // result in bytes.

    { return sDiskFreeSpaceSoftLimit << 10; }

  static uint32_t DiskFreeSpaceHardLimit() // result in bytes.

    { return sDiskFreeSpaceHardLimit << 10; }

  static bool SmartCacheSizeEnabled()

    { return sSmartCacheSizeEnabled; }

  static uint32_t PreloadChunkCount()

    { return sPreloadChunkCount; }

  static uint32_t MaxMemoryEntrySize() // result in bytes.

    { return sMaxMemoryEntrySize << 10; }

  static uint32_t MaxDiskEntrySize() // result in bytes.

    { return sMaxDiskEntrySize << 10; }

  static uint32_t MaxDiskChunksMemoryUsage(bool aPriority) // result in bytes.

    { return aPriority ? sMaxDiskPriorityChunksMemoryUsage << 10

                       : sMaxDiskChunksMemoryUsage << 10; }

  static uint32_t CompressionLevel()

    { return sCompressionLevel; }

  static uint32_t HalfLifeSeconds()

    { return sHalfLifeHours * 60.0F * 60.0F; }

  static bool ClearCacheOnShutdown()

    { return sSanitizeOnShutdown && sClearCacheOnShutdown; }

  static bool CacheFSReported()

    { return sCacheFSReported; }

  static void SetCacheFSReported();

  static bool HashStatsReported()

    { return sHashStatsReported; }

  static void SetHashStatsReported();

  static void ParentDirOverride(nsIFile ** aDir);

  static bool EntryIsTooBig(int64_t aSize, bool aUsingDisk);

  static uint32_t MaxShutdownIOLag()

    { return sMaxShutdownIOLag; }

  static bool IsPastShutdownIOLag();

  static bool ShuttingDown()

    { return sShutdownDemandedTime != PR_INTERVAL_NO_TIMEOUT; }

private:

  static CacheObserver* sSelf;

  void StoreDiskCacheCapacity();

  void StoreCacheFSReported();

  void StoreHashStatsReported();

  void AttachToPreferences();

  static bool sUseMemoryCache;

  static bool sUseDiskCache;

  static uint32_t sMetadataMemoryLimit;

  static int32_t sMemoryCacheCapacity;

  static int32_t sAutoMemoryCacheCapacity;

  static Atomic<uint32_t, Relaxed> sDiskCacheCapacity;

  static uint32_t sDiskFreeSpaceSoftLimit;

  static uint32_t sDiskFreeSpaceHardLimit;

  static bool sSmartCacheSizeEnabled;

  static uint32_t sPreloadChunkCount;

  static int32_t sMaxMemoryEntrySize;

  static int32_t sMaxDiskEntrySize;

  static uint32_t sMaxDiskChunksMemoryUsage;

  static uint32_t sMaxDiskPriorityChunksMemoryUsage;

  static uint32_t sCompressionLevel;

  static float sHalfLifeHours;

  static bool sSanitizeOnShutdown;

  static bool sClearCacheOnShutdown;

  static bool sCacheFSReported;

  static bool sHashStatsReported;

  static Atomic<uint32_t, Relaxed> sMaxShutdownIOLag;

  static Atomic<PRIntervalTime> sShutdownDemandedTime;

  // Non static properties, accessible via sSelf

  nsCOMPtr<nsIFile> mCacheParentDirectoryOverride;

};

} // namespace net

} // namespace mozilla

#endif