src/net/http/http_pipelined_host_pool.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_HTTP_HTTP_PIPELINED_HOST_POOL_H_
   6 #define NET_HTTP_HTTP_PIPELINED_HOST_POOL_H_
   7
   8 #include <map>
   9
  10 #include "base/basictypes.h"
  11 #include "base/gtest_prod_util.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "net/http/http_pipelined_host.h"
  15 #include "net/http/http_pipelined_host_capability.h"
  16
  17 namespace base {
  18 class Value;
  19 }
  20
  21 namespace net {
  22
  23 class HostPortPair;
  24 class HttpPipelinedStream;
  25 class HttpServerProperties;
  26
  27 // Manages all of the pipelining state for specific host with active pipelined
  28 // HTTP requests. Manages connection jobs, constructs pipelined streams, and
  29 // assigns requests to the least loaded pipelined connection.
  30 class NET_EXPORT_PRIVATE HttpPipelinedHostPool
  31     : public HttpPipelinedHost::Delegate {
  32  public:
  33   class Delegate {
  34    public:
  35     // Called when a HttpPipelinedHost has new capacity. Attempts to allocate
  36     // any pending pipeline-capable requests to pipelines.
  37     virtual void OnHttpPipelinedHostHasAdditionalCapacity(
  38         HttpPipelinedHost* host) = 0;
  39   };
  40
  41   HttpPipelinedHostPool(
  42       Delegate* delegate,
  43       HttpPipelinedHost::Factory* factory,
  44       const base::WeakPtr<HttpServerProperties>& http_server_properties,
  45       bool force_pipelining);
  46   virtual ~HttpPipelinedHostPool();
  47
  48   // Returns true if pipelining might work for |key|. Generally, this returns
  49   // true, unless |key| is known to have failed pipelining recently.
  50   bool IsKeyEligibleForPipelining(const HttpPipelinedHost::Key& key);
  51
  52   // Constructs a new pipeline on |connection| and returns a new
  53   // HttpPipelinedStream that uses it.
  54   HttpPipelinedStream* CreateStreamOnNewPipeline(
  55       const HttpPipelinedHost::Key& key,
  56       ClientSocketHandle* connection,
  57       const SSLConfig& used_ssl_config,
  58       const ProxyInfo& used_proxy_info,
  59       const BoundNetLog& net_log,
  60       bool was_npn_negotiated,
  61       NextProto protocol_negotiated);
  62
  63   // Tries to find an existing pipeline with capacity for a new request. If
  64   // successful, returns a new stream on that pipeline. Otherwise, returns NULL.
  65   HttpPipelinedStream* CreateStreamOnExistingPipeline(
  66       const HttpPipelinedHost::Key& key);
  67
  68   // Returns true if a pipelined connection already exists for |key| and
  69   // can accept new requests.
  70   bool IsExistingPipelineAvailableForKey(const HttpPipelinedHost::Key& key);
  71
  72   // Callbacks for HttpPipelinedHost.
  73   virtual void OnHostIdle(HttpPipelinedHost* host) OVERRIDE;
  74
  75   virtual void OnHostHasAdditionalCapacity(HttpPipelinedHost* host) OVERRIDE;
  76
  77   virtual void OnHostDeterminedCapability(
  78       HttpPipelinedHost* host,
  79       HttpPipelinedHostCapability capability) OVERRIDE;
  80
  81   // Creates a Value summary of this pool's |host_map_|. Caller assumes
  82   // ownership of the returned Value.
  83   base::Value* PipelineInfoToValue() const;
  84
  85  private:
  86   typedef std::map<HttpPipelinedHost::Key, HttpPipelinedHost*> HostMap;
  87
  88   HttpPipelinedHost* GetPipelinedHost(const HttpPipelinedHost::Key& key,
  89                                       bool create_if_not_found);
  90
  91   Delegate* delegate_;
  92   scoped_ptr<HttpPipelinedHost::Factory> factory_;
  93   HostMap host_map_;
  94   const base::WeakPtr<HttpServerProperties> http_server_properties_;
  95   bool force_pipelining_;
  96
  97   DISALLOW_COPY_AND_ASSIGN(HttpPipelinedHostPool);
  98 };
  99
 100 }  // namespace net
 101
 102 #endif  // NET_HTTP_HTTP_PIPELINED_HOST_POOL_H_