Adds custom ttl argument to HostCache::Set.

net/proxy/proxy_resolver_js_bindings.cc

 // 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.
 
 #include "net/proxy/proxy_resolver_js_bindings.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/values.h"
 #include "net/base/address_list.h"
 #include "net/base/host_cache.h"
 #include "net/base/host_resolver.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
 #include "net/base/net_util.h"
 #include "net/base/sys_addrinfo.h"
 #include "net/proxy/proxy_resolver_error_observer.h"
 #include "net/proxy/proxy_resolver_request_context.h"
 #include "net/proxy/sync_host_resolver.h"
 
 namespace net {
 
 namespace {
 
+// TTL for the per-request DNS cache. Applies to both successful and failed
+// DNS resolutions.
+const base::TimeDelta kCacheEntryTTL = base::TimeDelta::FromMinutes(5);
+
 // Event parameters for a PAC error message (line number + message).
 class ErrorNetlogParams : public NetLog::EventParameters {
  public:
   ErrorNetlogParams(int line_number,
                     const string16& message)
       : line_number_(line_number),
         message_(message) {
   }
 
   virtual Value* ToValue() const OVERRIDE {
@@ skipping 220 matching lines @@
         return entry->error;
       }
     }
 
     // Otherwise ask the host resolver.
     int result = host_resolver_->Resolve(info, address_list);
 
     // Save the result back to the per-request DNS cache.
     if (host_cache) {
       host_cache->Set(cache_key, result, *address_list,
-                      base::TimeTicks::Now());
+                      base::TimeTicks::Now(),
+                      kCacheEntryTTL);
     }
 
     return result;
   }
 
   void LogEventToCurrentRequest(
       NetLog::EventPhase phase,
       NetLog::EventType type,
       scoped_refptr<NetLog::EventParameters> params) {
     if (current_request_context() && current_request_context()->net_log)
@@ skipping 26 matching lines @@
 
 // static
 ProxyResolverJSBindings* ProxyResolverJSBindings::CreateDefault(
     SyncHostResolver* host_resolver,
     NetLog* net_log,
     ProxyResolverErrorObserver* error_observer) {
   return new DefaultJSBindings(host_resolver, net_log, error_observer);
 }
 
 }  // namespace net