* Avoid doing concurrent DNS resolves of the same hostname in HostResolver.

* Add a 1 minute cache for host resolves.

* Refactor HostResolver to handle multiple requests.

* Make HostResolver a dependency of URLRequestContext. operate the HostResolver
in async mode for proxy resolver (bridging to IO thread).

TEST=unittests
BUG=13163

Review URL: http://codereview.chromium.org/118100

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18236 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 26 insertions, 3 deletions

diff --git a/net/base/address_list.h b/net/base/address_list.h
index 5bffd4c..506350b 100644
--- a/net/base/address_list.h
+++ b/net/base/address_list.h
@@ -20,16 +20,39 @@ class AddressList {
   // object.
   void Adopt(struct addrinfo* head);
 
+  // Copies the given addrinfo rather than adopting it.
+  void Copy(const struct addrinfo* head);
+
+  // Sets the port of all addresses in the list to |port| (that is the
+  // sin[6]_port field for the sockaddrs).
+  void SetPort(int port);
+
+  // Retrieves the port number of the first sockaddr in the list. (If SetPort()
+  // was previously used on this list, then all the addresses will have this
+  // same port number.)
+  int GetPort() const;
+
+  // Sets the address to match |src|, and have each sockaddr's port be |port|.
+  // If |src| already has the desired port this operation is cheap (just adds
+  // a reference to |src|'s data.) Otherwise we will make a copy.
+  void SetFrom(const AddressList& src, int port);
+
+  // Clears all data from this address list. This leaves the list in the same
+  // empty state as when first constructed.
+  void Reset();
+
   // Get access to the head of the addrinfo list.
   const struct addrinfo* head() const { return data_->head; }
 
  private:
   struct Data : public base::RefCountedThreadSafe<Data> {
-    explicit Data(struct addrinfo* ai) : head(ai) {}
+    Data(struct addrinfo* ai, bool is_system_created)
+        : head(ai), is_system_created(is_system_created) {}
     ~Data();
     struct addrinfo* head;
-   private:
-    Data();
+
+    // Indicates which free function to use for |head|.
+    bool is_system_created;
   };
   scoped_refptr<Data> data_;
 };