Add m-esr52 at 52.6.0

1 files changed, 123 insertions, 0 deletions

diff --git a/netwerk/cache/nsDiskCacheBinding.h b/netwerk/cache/nsDiskCacheBinding.h
new file mode 100644
index 000000000..63c2094ce
--- /dev/null
+++ b/netwerk/cache/nsDiskCacheBinding.h
@@ -0,0 +1,123 @@
+/* -*- 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_ */