Save pipelining capabilities for the most used hosts between sessions.

net/http/http_server_properties_impl.h

 // 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_SERVER_PROPERTIES_IMPL_H_
 #define NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/hash_tables.h"
+#include "base/memory/mru_cache.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/values.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_export.h"
+#include "net/http/http_pipelined_host_capability.h"
 #include "net/http/http_server_properties.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace net {
 
 // The implementation for setting/retrieving the HTTP server properties.
 class NET_EXPORT HttpServerPropertiesImpl
     : public HttpServerProperties,
       NON_EXPORTED_BASE(public base::NonThreadSafe) {
  public:
   HttpServerPropertiesImpl();
   virtual ~HttpServerPropertiesImpl();
 
   // Initializes |spdy_servers_table_| with the servers (host/port) from
   // |spdy_servers| that either support SPDY or not.
   void InitializeSpdyServers(std::vector<std::string>* spdy_servers,
                              bool support_spdy);
 
   void InitializeAlternateProtocolServers(
       AlternateProtocolMap* alternate_protocol_servers);
 
   void InitializeSpdySettingsServers(SpdySettingsMap* spdy_settings_map);
 
+  // Initializes |pipeline_capability_map_| with the servers (host/port) from
+  // |pipeline_capability_map| that either support HTTP pipelining or not.
+  void InitializePipelineCapabilities(
+      const PipelineCapabilityMap* pipeline_capability_map);
+
   // Get the list of servers (host/port) that support SPDY.
   void GetSpdyServerList(base::ListValue* spdy_server_list) const;
 
   // Returns flattened string representation of the |host_port_pair|. Used by
   // unittests.
   static std::string GetFlattenedSpdyServer(
       const net::HostPortPair& host_port_pair);
 
   // Debugging to simulate presence of an AlternateProtocol.
   // If we don't have an alternate protocol in the map for any given host/port
   // pair, force this ProtocolPortPair.
   static void ForceAlternateProtocol(const PortAlternateProtocolPair& pair);
   static void DisableForcedAlternateProtocol();
 
+  // Changes the number of host/port pairs we remember pipelining capability
+  // for. A larger number means we're more likely to be able to pipeline
+  // immediately if a host is known good, but uses more memory. This function
+  // can only be called if |pipeline_capability_map_| is empty.
+  void SetNumPipelinedHostsToRemember(int max_size);
+
   // -----------------------------
   // HttpServerProperties methods:
   // -----------------------------
 
   // Deletes all data.
   virtual void Clear() OVERRIDE;
 
   // Returns true if |server| supports SPDY.
   virtual bool SupportsSpdy(const HostPortPair& server) const OVERRIDE;
 
@@ skipping 30 matching lines @@
   // persisted because |spdy_settings_map_| has been updated.
   virtual bool SetSpdySettings(const HostPortPair& host_port_pair,
                                const spdy::SpdySettings& settings) OVERRIDE;
 
   // Clears all spdy_settings.
   virtual void ClearSpdySettings() OVERRIDE;
 
   // Returns all persistent SpdySettings.
   virtual const SpdySettingsMap& spdy_settings_map() const OVERRIDE;
 
+  virtual HttpPipelinedHostCapability GetPipelineCapability(
+      const HostPortPair& origin) OVERRIDE;
+
+  virtual void SetPipelineCapability(
+      const HostPortPair& origin,
+      HttpPipelinedHostCapability capability) OVERRIDE;
+
+  virtual void ClearPipelineCapabilities() OVERRIDE;
+
+  virtual PipelineCapabilityMap GetPipelineCapabilityMap() const OVERRIDE;
+
  private:
+  typedef base::MRUCache<
+      HostPortPair, HttpPipelinedHostCapability> CachedPipelineCapabilityMap;
   // |spdy_servers_table_| has flattened representation of servers (host/port
   // pair) that either support or not support SPDY protocol.
   typedef base::hash_map<std::string, bool> SpdyServerHostPortTable;
   SpdyServerHostPortTable spdy_servers_table_;
 
   AlternateProtocolMap alternate_protocol_map_;
   SpdySettingsMap spdy_settings_map_;
+  scoped_ptr<CachedPipelineCapabilityMap> pipeline_capability_map_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpServerPropertiesImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_