97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef CacheFileContextEvictor__h__
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#define CacheFileContextEvictor__h__
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#include "nsTArray.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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class nsIFile;
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class nsILoadContextInfo;
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namespace mozilla {
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namespace net {
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class CacheIndexIterator;
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struct CacheFileContextEvictorEntry
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{
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nsCOMPtr<nsILoadContextInfo> mInfo;
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bool mPinned;
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PRTime mTimeStamp; // in milliseconds
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RefPtr<CacheIndexIterator> mIterator;
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};
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class CacheFileContextEvictor
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{
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CacheFileContextEvictor)
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CacheFileContextEvictor();
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private:
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virtual ~CacheFileContextEvictor();
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public:
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nsresult Init(nsIFile *aCacheDirectory);
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// Returns number of contexts that are being evicted.
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uint32_t ContextsCount();
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// Start evicting given context.
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nsresult AddContext(nsILoadContextInfo *aLoadContextInfo, bool aPinned);
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// CacheFileIOManager calls this method when CacheIndex's state changes. We
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// check whether the index is up to date and start or stop evicting according
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// to index's state.
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nsresult CacheIndexStateChanged();
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// CacheFileIOManager calls this method to check whether an entry file should
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// be considered as evicted. It returns true when there is a matching context
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// info to the given key and the last modified time of the entry file is
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// earlier than the time stamp of the time when the context was added to the
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// evictor.
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nsresult WasEvicted(const nsACString &aKey, nsIFile *aFile,
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bool *aEvictedAsPinned, bool *aEvictedAsNonPinned);
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private:
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// Writes information about eviction of the given context to the disk. This is
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// done for every context added to the evictor to be able to recover eviction
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// after a shutdown or crash. When the context file is found after startup, we
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// restore mTimeStamp from the last modified time of the file.
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nsresult PersistEvictionInfoToDisk(nsILoadContextInfo *aLoadContextInfo, bool aPinned);
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// Once we are done with eviction for the given context, the eviction info is
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// removed from the disk.
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nsresult RemoveEvictInfoFromDisk(nsILoadContextInfo *aLoadContextInfo, bool aPinned);
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// Tries to load all contexts from the disk. This method is called just once
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// after startup.
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nsresult LoadEvictInfoFromDisk();
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nsresult GetContextFile(nsILoadContextInfo *aLoadContextInfo, bool aPinned,
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nsIFile **_retval);
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void CreateIterators();
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void CloseIterators();
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void StartEvicting();
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nsresult EvictEntries();
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// Whether eviction is in progress
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bool mEvicting;
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// Whether index is up to date. We wait with eviction until the index finishes
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// update process when it is outdated. NOTE: We also stop eviction in progress
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// when the index is found outdated, the eviction is restarted again once the
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// update process finishes.
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bool mIndexIsUpToDate;
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// Whether we already tried to restore unfinished jobs from previous run after
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// startup.
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static bool sDiskAlreadySearched;
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// Array of contexts being evicted.
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nsTArray<nsAutoPtr<CacheFileContextEvictorEntry> > mEntries;
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nsCOMPtr<nsIFile> mCacheDirectory;
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nsCOMPtr<nsIFile> mEntriesDir;
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};
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} // namespace net
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} // namespace mozilla
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#endif
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