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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.
#include <map>
#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"
#include "net/http/http_pipelined_host.h"
#include "net/http/http_pipelined_host_capability.h"
namespace base {
class Value;
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 HttpPipelinedHostImpl
: public HttpPipelinedHost,
public HttpPipelinedConnection::Delegate {
HttpPipelinedHostImpl(HttpPipelinedHost::Delegate* delegate,
const HttpPipelinedHost::Key& key,
HttpPipelinedConnection::Factory* factory,
HttpPipelinedHostCapability capability);
virtual ~HttpPipelinedHostImpl();
// HttpPipelinedHost interface
virtual HttpPipelinedStream* CreateStreamOnNewPipeline(
ClientSocketHandle* connection,
const SSLConfig& used_ssl_config,
const ProxyInfo& used_proxy_info,
const BoundNetLog& net_log,
bool was_npn_negotiated,
NextProto protocol_negotiated) override;
virtual HttpPipelinedStream* CreateStreamOnExistingPipeline() override;
virtual bool IsExistingPipelineAvailable() const override;
// HttpPipelinedConnection::Delegate interface
// 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;
virtual void OnPipelineFeedback(
HttpPipelinedConnection* pipeline,
HttpPipelinedConnection::Feedback feedback) override;
virtual const Key& GetKey() const override;
// Creates a Value summary of this host's |pipelines_|. Caller assumes
// ownership of the returned Value.
virtual base::Value* PipelineInfoToValue() const override;
// Returns the maximum number of in-flight pipelined requests we'll allow on a
// single connection.
static int max_pipeline_depth() { return 3; }
struct PipelineInfo {
int num_successes;
typedef std::map<HttpPipelinedConnection*, PipelineInfo> PipelineInfoMap;
// 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* pipeline);
// Returns the current pipeline capacity based on |capability_|. This should
// not be called if |capability_| is INCAPABLE.
int GetPipelineCapacity() const;
// Returns true if |pipeline| can handle a new request. This is true if the
// |pipeline| is active, usable, has capacity, and |capability_| is
// sufficient.
bool CanPipelineAcceptRequests(HttpPipelinedConnection* pipeline) const;
// Called when |this| moves from UNKNOWN |capability_| to PROBABLY_CAPABLE.
// Causes all pipelines to increase capacity to start pipelining.
void NotifyAllPipelinesHaveCapacity();
HttpPipelinedHost::Delegate* delegate_;
const Key key_;
PipelineInfoMap pipelines_;
scoped_ptr<HttpPipelinedConnection::Factory> factory_;
HttpPipelinedHostCapability capability_;
} // namespace net