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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.
#ifndef CONTENT_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
#define CONTENT_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
#pragma once
#include <string>
#include "content/browser/renderer_host/resource_handler.h"
#include "googleurl/src/gurl.h"
namespace net {
class URLRequest;
}
namespace content {
class ResourceDispatcherHostImpl;
class ResourceMessageFilter;
class SharedIOBuffer;
// Used to complete an asynchronous resource request in response to resource
// load events from the resource dispatcher host.
class AsyncResourceHandler : public ResourceHandler {
public:
AsyncResourceHandler(ResourceMessageFilter* filter,
int routing_id,
net::URLRequest* request,
ResourceDispatcherHostImpl* rdh);
virtual ~AsyncResourceHandler();
// IPC message handlers:
void OnFollowRedirect(bool has_new_first_party_for_cookies,
const GURL& new_first_party_for_cookies);
void OnDataReceivedACK();
// ResourceHandler implementation:
virtual bool OnUploadProgress(int request_id,
uint64 position,
uint64 size) OVERRIDE;
virtual bool OnRequestRedirected(int request_id,
const GURL& new_url,
ResourceResponse* response,
bool* defer) OVERRIDE;
virtual bool OnResponseStarted(int request_id,
ResourceResponse* response,
bool* defer) OVERRIDE;
virtual bool OnWillStart(int request_id,
const GURL& url,
bool* defer) OVERRIDE;
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;
virtual void OnDataDownloaded(int request_id,
int bytes_downloaded) OVERRIDE;
static void GlobalCleanup();
private:
// Returns true if it's ok to send the data. If there are already too many
// data messages pending, it defers the request and returns false. In this
// case the caller should not send the data.
void WillSendData(bool* defer);
void ResumeIfDeferred();
scoped_refptr<SharedIOBuffer> read_buffer_;
scoped_refptr<ResourceMessageFilter> filter_;
int routing_id_;
net::URLRequest* request_;
ResourceDispatcherHostImpl* rdh_;
// |next_buffer_size_| is the size of the buffer to be allocated on the next
// OnWillRead() call. We exponentially grow the size of the buffer allocated
// when our owner fills our buffers. On the first OnWillRead() call, we
// allocate a buffer of 32k and double it in OnReadCompleted() if the buffer
// was filled, up to a maximum size of 512k.
int next_buffer_size_;
// Number of messages we've sent to the renderer that we haven't gotten an
// ACK for. This allows us to avoid having too many messages in flight.
int pending_data_count_;
bool did_defer_;
bool sent_received_response_msg_;
DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
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