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// Copyright (c) 2011 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 NET_HTTP_HTTP_PIPELINED_HOST_H_
#define NET_HTTP_HTTP_PIPELINED_HOST_H_
#pragma once
#include <set>
#include <string>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_export.h"
#include "net/http/http_pipelined_connection.h"
namespace net {
class BoundNetLog;
class ClientSocketHandle;
class HttpPipelinedStream;
class ProxyInfo;
struct SSLConfig;
// Manages all of the pipelining state for specific host with active pipelined
// HTTP requests. Manages connection jobs, constructs pipelined streams, and
// assigns requests to the least loaded pipelined connection.
class NET_EXPORT_PRIVATE HttpPipelinedHost
: public HttpPipelinedConnection::Delegate {
public:
class Delegate {
public:
// Called when a pipelined host has no outstanding requests on any of its
// pipelined connections.
virtual void OnHostIdle(HttpPipelinedHost* host) = 0;
// Called when a pipelined host has newly available pipeline capacity, like
// when a request completes.
virtual void OnHostHasAdditionalCapacity(HttpPipelinedHost* host) = 0;
};
HttpPipelinedHost(Delegate* delegate, const HostPortPair& origin,
HttpPipelinedConnection::Factory* factory);
virtual ~HttpPipelinedHost();
// Constructs a new pipeline on |connection| and returns a new
// HttpPipelinedStream that uses it.
HttpPipelinedStream* CreateStreamOnNewPipeline(
ClientSocketHandle* connection,
const SSLConfig& used_ssl_config,
const ProxyInfo& used_proxy_info,
const BoundNetLog& net_log,
bool was_npn_negotiated);
// Tries to find an existing pipeline with capacity for a new request. If
// successful, returns a new stream on that pipeline. Otherwise, returns NULL.
HttpPipelinedStream* CreateStreamOnExistingPipeline();
// Returns true if we have a pipelined connection that can accept new
// requests.
bool IsExistingPipelineAvailable();
// Callbacks for HttpPipelinedConnection.
// Called when a pipelined connection completes a request. Adds a pending
// request to the pipeline if the pipeline is still usable.
virtual void OnPipelineHasCapacity(
HttpPipelinedConnection* pipeline) OVERRIDE;
const HostPortPair& origin() const { return origin_; }
private:
// Called when a pipeline is empty and there are no pending requests. Closes
// the connection.
void OnPipelineEmpty(HttpPipelinedConnection* pipeline);
// Adds the next pending request to the pipeline if it's still usuable.
void AddRequestToPipeline(HttpPipelinedConnection* connection);
int max_pipeline_depth() const { return 3; }
Delegate* delegate_;
const HostPortPair origin_;
std::set<HttpPipelinedConnection*> pipelines_;
scoped_ptr<HttpPipelinedConnection::Factory> factory_;
DISALLOW_COPY_AND_ASSIGN(HttpPipelinedHost);
};
} // namespace net
#endif // NET_HTTP_HTTP_PIPELINED_HOST_H_
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