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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /netwerk/cache/nsDiskCacheBinding.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'netwerk/cache/nsDiskCacheBinding.h')
-rw-r--r--netwerk/cache/nsDiskCacheBinding.h123
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diff --git a/netwerk/cache/nsDiskCacheBinding.h b/netwerk/cache/nsDiskCacheBinding.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * 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 _nsDiskCacheBinding_h_
+#define _nsDiskCacheBinding_h_
+
+#include "mozilla/MemoryReporting.h"
+#include "nspr.h"
+#include "PLDHashTable.h"
+
+#include "nsISupports.h"
+#include "nsCacheEntry.h"
+
+#include "nsDiskCacheMap.h"
+#include "nsDiskCacheStreams.h"
+
+
+/******************************************************************************
+ * nsDiskCacheBinding
+ *
+ * Created for disk cache specific data and stored in nsCacheEntry.mData as
+ * an nsISupports. Also stored in nsDiskCacheHashTable, with collisions
+ * linked by the PRCList.
+ *
+ *****************************************************************************/
+
+class nsDiskCacheDeviceDeactivateEntryEvent;
+
+class nsDiskCacheBinding : public nsISupports, public PRCList {
+ virtual ~nsDiskCacheBinding();
+
+public:
+ NS_DECL_THREADSAFE_ISUPPORTS
+
+ nsDiskCacheBinding(nsCacheEntry* entry, nsDiskCacheRecord * record);
+
+ nsresult EnsureStreamIO();
+ bool IsActive() { return mCacheEntry != nullptr;}
+
+// XXX make friends
+public:
+ nsCacheEntry* mCacheEntry; // back pointer to parent nsCacheEntry
+ nsDiskCacheRecord mRecord;
+ nsDiskCacheStreamIO* mStreamIO; // strong reference
+ bool mDoomed; // record is not stored in cache map
+ uint8_t mGeneration; // possibly just reservation
+
+ // If set, points to a pending event which will deactivate |mCacheEntry|.
+ // If not set then either |mCacheEntry| is not deactivated, or it has been
+ // deactivated but the device returned it from FindEntry() before the event
+ // fired. In both two latter cases this binding is to be considered valid.
+ nsDiskCacheDeviceDeactivateEntryEvent *mDeactivateEvent;
+};
+
+
+/******************************************************************************
+ * Utility Functions
+ *****************************************************************************/
+
+nsDiskCacheBinding * GetCacheEntryBinding(nsCacheEntry * entry);
+
+
+
+/******************************************************************************
+ * nsDiskCacheBindery
+ *
+ * Used to keep track of nsDiskCacheBinding associated with active/bound (and
+ * possibly doomed) entries. Lookups on 4 byte disk hash to find collisions
+ * (which need to be doomed, instead of just evicted. Collisions are linked
+ * using a PRCList to keep track of current generation number.
+ *
+ * Used to detect hash number collisions, and find available generation numbers.
+ *
+ * Not all nsDiskCacheBinding have a generation number.
+ *
+ * Generation numbers may be aquired late, or lost (when data fits in block file)
+ *
+ * Collisions can occur:
+ * BindEntry() - hashnumbers collide (possibly different keys)
+ *
+ * Generation number required:
+ * DeactivateEntry() - metadata written to disk, may require file
+ * GetFileForEntry() - force data to require file
+ * writing to stream - data size may require file
+ *
+ * Binding can be kept in PRCList in order of generation numbers.
+ * Binding with no generation number can be Appended to PRCList (last).
+ *
+ *****************************************************************************/
+
+class nsDiskCacheBindery {
+public:
+ nsDiskCacheBindery();
+ ~nsDiskCacheBindery();
+
+ void Init();
+ void Reset();
+
+ nsDiskCacheBinding * CreateBinding(nsCacheEntry * entry,
+ nsDiskCacheRecord * record);
+
+ nsDiskCacheBinding * FindActiveBinding(uint32_t hashNumber);
+ void RemoveBinding(nsDiskCacheBinding * binding);
+ bool ActiveBindings();
+
+ size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf);
+
+private:
+ nsresult AddBinding(nsDiskCacheBinding * binding);
+
+ // member variables
+ static const PLDHashTableOps ops;
+ PLDHashTable table;
+ bool initialized;
+
+ static const uint32_t kInitialTableLength = 0;
+};
+
+#endif /* _nsDiskCacheBinding_h_ */