The Tor Browser: content/media/EncodedBufferCache.h@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

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

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

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

     7 #ifndef EncodedBufferCache_h_

     8 #define EncodedBufferCache_h_

    10 #include "nsCOMPtr.h"

    11 #include "nsTArray.h"

    12 #include "mozilla/Mutex.h"

    14 struct PRFileDesc;

    15 class nsIDOMBlob;

    17 namespace mozilla {

    19 class ReentrantMonitor;

    20 /**

    21  * Data is moved into a temporary file when it grows beyond

    22  * the maximal size passed in the Init function.

    23  * The AppendBuffer and ExtractBlob methods are thread-safe and can be called on

    24  * different threads at the same time.

    25  */

    26 class EncodedBufferCache

    27 {

    28 public:

    29   EncodedBufferCache(uint32_t aMaxMemoryStorage)

    30   : mFD(nullptr),

    31     mMutex("EncodedBufferCache.Data.Mutex"),

    32     mDataSize(0),

    33     mMaxMemoryStorage(aMaxMemoryStorage),

    34     mTempFileEnabled(false) { }

    35   ~EncodedBufferCache()

    36   {

    37   }

    38   // Append buffers in cache, check if the queue is too large then switch to write buffer to file system

    39   // aBuf will append to mEncodedBuffers or temporary File, aBuf also be cleared

    40   void AppendBuffer(nsTArray<uint8_t> & aBuf);

    41   // Read all buffer from memory or file System, also Remove the temporary file or clean the buffers in memory.

    42   already_AddRefed<nsIDOMBlob> ExtractBlob(const nsAString &aContentType);

    44 private:

    45   //array for storing the encoded data.

    46   nsTArray<nsTArray<uint8_t> > mEncodedBuffers;

    47   // File handle for the temporary file

    48   PRFileDesc* mFD;

    49   // Used to protect the mEncodedBuffer for avoiding AppendBuffer/Consume on different thread at the same time.

    50   Mutex mMutex;

    51   // the current buffer size can be read

    52   uint64_t mDataSize;

    53   // The maximal buffer allowed in memory

    54   uint32_t mMaxMemoryStorage;

    55   // indicate the buffer is stored on temporary file or not

    56   bool mTempFileEnabled;

    57 };

    59 } // namespace mozilla

    61 #endif

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