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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef TokenizedChunkQueue_h
#define TokenizedChunkQueue_h
#include "core/html/parser/HTMLDocumentParser.h"
#include "wtf/Deque.h"
#include "wtf/PassRefPtr.h"
#include "wtf/ThreadSafeRefCounted.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/Vector.h"
#include <memory>
namespace blink {
// TokenizedChunkQueue is used to transfer parsed HTML token chunks
// from BackgroundHTMLParser thread to Blink main thread without
// spamming task queue.
// TokenizedChunkQueue is accessed from both BackgroundHTMLParser
// thread (producer) and Blink main thread (consumer).
// Access to the backend queue vector is protected by a mutex.
// If enqueue is done against empty queue, BackgroundHTMLParser
// thread kicks a consumer task on Blink main thread.
class TokenizedChunkQueue : public ThreadSafeRefCounted<TokenizedChunkQueue> {
public:
static PassRefPtr<TokenizedChunkQueue> create() {
return adoptRef(new TokenizedChunkQueue);
}
~TokenizedChunkQueue();
bool enqueue(std::unique_ptr<HTMLDocumentParser::TokenizedChunk>);
void clear();
void takeAll(Vector<std::unique_ptr<HTMLDocumentParser::TokenizedChunk>>&);
size_t peakPendingChunkCount();
size_t peakPendingTokenCount();
private:
TokenizedChunkQueue();
std::unique_ptr<Mutex> m_mutex;
Vector<std::unique_ptr<HTMLDocumentParser::TokenizedChunk>> m_pendingChunks;
size_t m_peakPendingChunkCount = 0;
size_t m_peakPendingTokenCount = 0;
size_t m_pendingTokenCount = 0;
};
} // namespace blink
#endif
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