SPDY - persist 300 most recently used servers that support SPDY to preferences file

net/http/http_server_properties_impl.h

 // 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 NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_
 #define NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 16 matching lines @@
 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
+  // Initializes |spdy_servers_map_| 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;
+  // Get the list of servers (host/port) that support SPDY. The max_size is the
+  // number of MRU servers that support SPDY that are to be returned.
+  void GetSpdyServerList(base::ListValue* spdy_server_list,
+                         size_t max_size) 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:
   // -----------------------------
 
   // Gets a weak pointer for this object.
   virtual base::WeakPtr<HttpServerProperties> GetWeakPtr() OVERRIDE;
 
   // Deletes all data.
   virtual void Clear() OVERRIDE;
 
   // Returns true if |server| supports SPDY.
-  virtual bool SupportsSpdy(const HostPortPair& server) const OVERRIDE;
+  virtual bool SupportsSpdy(const HostPortPair& server) OVERRIDE;
 
   // Add |server| into the persistent store.
   virtual void SetSupportsSpdy(const HostPortPair& server,
                                bool support_spdy) OVERRIDE;
 
   // Returns true if |server| has an Alternate-Protocol header.
   virtual bool HasAlternateProtocol(const HostPortPair& server) OVERRIDE;
 
   // Returns the Alternate-Protocol and port for |server|.
   // HasAlternateProtocol(server) must be true.
@@ skipping 56 matching lines @@
       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;
+  // |spdy_servers_map_| has flattened representation of servers (host, port)
+  // that either support or not support SPDY protocol.
+  typedef base::MRUCache<std::string, bool> SpdyServerHostPortMap;
   typedef std::map<HostPortPair, NetworkStats> ServerNetworkStatsMap;
   typedef std::map<HostPortPair, HostPortPair> CanonicalHostMap;
   typedef std::vector<std::string> CanonicalSufficList;
   // List of broken host:ports and the times when they can be expired.
   struct BrokenAlternateProtocolEntry {
     HostPortPair server;
     base::TimeTicks when;
   };
   typedef std::list<BrokenAlternateProtocolEntry>
       BrokenAlternateProtocolList;
   // Map from host:port to the number of times alternate protocol has
   // been marked broken.
   typedef std::map<HostPortPair, int> BrokenAlternateProtocolMap;
 
   // Return the canonical host for |server|, or end if none exists.
   CanonicalHostMap::const_iterator GetCanonicalHost(HostPortPair server) const;
 
   void ExpireBrokenAlternateProtocolMappings();
   void ScheduleBrokenAlternateProtocolMappingsExpiration();
 
-  SpdyServerHostPortTable spdy_servers_table_;
+  SpdyServerHostPortMap spdy_servers_map_;
 
   AlternateProtocolMap alternate_protocol_map_;
   BrokenAlternateProtocolList broken_alternate_protocol_list_;
   BrokenAlternateProtocolMap broken_alternate_protocol_map_;
 
   SpdySettingsMap spdy_settings_map_;
   ServerNetworkStatsMap server_network_stats_map_;
   scoped_ptr<CachedPipelineCapabilityMap> pipeline_capability_map_;
   // Contains a map of servers which could share the same alternate protocol.
   // Map from a Canonical host/port (host is some postfix of host names) to an
   // actual origin, which has a plausible alternate protocol mapping.
   CanonicalHostMap canonical_host_to_origin_map_;
   // Contains list of suffixes (for exmaple ".c.youtube.com",
   // ".googlevideo.com") of canoncial hostnames.
   CanonicalSufficList canoncial_suffixes_;
 
   base::WeakPtrFactory<HttpServerPropertiesImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpServerPropertiesImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_