1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/EncodedBufferCache.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,61 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef EncodedBufferCache_h_
1.11 +#define EncodedBufferCache_h_
1.12 +
1.13 +#include "nsCOMPtr.h"
1.14 +#include "nsTArray.h"
1.15 +#include "mozilla/Mutex.h"
1.16 +
1.17 +struct PRFileDesc;
1.18 +class nsIDOMBlob;
1.19 +
1.20 +namespace mozilla {
1.21 +
1.22 +class ReentrantMonitor;
1.23 +/**
1.24 + * Data is moved into a temporary file when it grows beyond
1.25 + * the maximal size passed in the Init function.
1.26 + * The AppendBuffer and ExtractBlob methods are thread-safe and can be called on
1.27 + * different threads at the same time.
1.28 + */
1.29 +class EncodedBufferCache
1.30 +{
1.31 +public:
1.32 + EncodedBufferCache(uint32_t aMaxMemoryStorage)
1.33 + : mFD(nullptr),
1.34 + mMutex("EncodedBufferCache.Data.Mutex"),
1.35 + mDataSize(0),
1.36 + mMaxMemoryStorage(aMaxMemoryStorage),
1.37 + mTempFileEnabled(false) { }
1.38 + ~EncodedBufferCache()
1.39 + {
1.40 + }
1.41 + // Append buffers in cache, check if the queue is too large then switch to write buffer to file system
1.42 + // aBuf will append to mEncodedBuffers or temporary File, aBuf also be cleared
1.43 + void AppendBuffer(nsTArray<uint8_t> & aBuf);
1.44 + // Read all buffer from memory or file System, also Remove the temporary file or clean the buffers in memory.
1.45 + already_AddRefed<nsIDOMBlob> ExtractBlob(const nsAString &aContentType);
1.46 +
1.47 +private:
1.48 + //array for storing the encoded data.
1.49 + nsTArray<nsTArray<uint8_t> > mEncodedBuffers;
1.50 + // File handle for the temporary file
1.51 + PRFileDesc* mFD;
1.52 + // Used to protect the mEncodedBuffer for avoiding AppendBuffer/Consume on different thread at the same time.
1.53 + Mutex mMutex;
1.54 + // the current buffer size can be read
1.55 + uint64_t mDataSize;
1.56 + // The maximal buffer allowed in memory
1.57 + uint32_t mMaxMemoryStorage;
1.58 + // indicate the buffer is stored on temporary file or not
1.59 + bool mTempFileEnabled;
1.60 +};
1.61 +
1.62 +} // namespace mozilla
1.63 +
1.64 +#endif
