/* 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() {}

  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