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// Copyright (c) 2012 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.
// DuplicateContentResourceHandler keeps a hash of resources seen and based on
// url. It is an experiment meant to simulate cache hits for both a url-based
// and a content-based cache.
#ifndef CONTENT_BROWSER_RENDERER_HOST_DUPLICATE_CONTENT_RESOURCE_HANDLER_H_
#define CONTENT_BROWSER_RENDERER_HOST_DUPLICATE_CONTENT_RESOURCE_HANDLER_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "content/browser/renderer_host/layered_resource_handler.h"
#include "third_party/smhasher/src/PMurHash.h"
#include "webkit/glue/resource_type.h"
namespace net {
class IOBuffer;
class URLRequest;
class URLRequestStatus;
}
namespace content {
class DuplicateContentResourceHandler: public LayeredResourceHandler {
public:
DuplicateContentResourceHandler(scoped_ptr<ResourceHandler> next_handler,
ResourceType::Type resource_type,
net::URLRequest* request);
virtual ~DuplicateContentResourceHandler();
private:
// ResourceHandler implementation
virtual bool OnWillRead(int request_id,
net::IOBuffer** buf,
int* buf_size,
int min_size) OVERRIDE;
virtual bool OnReadCompleted(int request_id,
int bytes_read,
bool* defer) OVERRIDE;
virtual bool OnResponseCompleted(int request_id,
const net::URLRequestStatus& status,
const std::string& security_info) OVERRIDE;
void RecordContentMetrics();
ResourceType::Type resource_type_;
int bytes_read_;
scoped_refptr<net::IOBuffer> read_buffer_;
net::URLRequest* request_;
// These values are temporary values that are used in each digest of the
// inputs for the incremental hash (PMurHash).
MH_UINT32 pmurhash_ph1_;
MH_UINT32 pmurhash_pcarry_;
// Used to track if it's a request we're interested in. If it's not, then we
// early out to avoid calculating the hash unnecessarily.
bool track_request_;
DISALLOW_COPY_AND_ASSIGN(DuplicateContentResourceHandler);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_DUPLICATE_CONTENT_RESOURCE_HANDLER_H_
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