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// Copyright (c) 2006-2008 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.
// This is the global interface for the dns prefetch services. It centralizes
// initialization, along with all the callbacks etc. to connect to the browser
// process. This allows the more standard DNS prefetching services, such as
// provided by DnsMaster to be left as more generally usable code, and possibly
// be shared across multiple client projects.
#ifndef CHROME_BROWSER_NET_DNS_GLOBAL_H_
#define CHROME_BROWSER_NET_DNS_GLOBAL_H_
#include "chrome/browser/net/dns_master.h"
#include <string>
class PrefService;
namespace net {
class HostResolver;
}
namespace chrome_browser_net {
// Initialize dns prefetching subsystem. Must be called before any other
// functions.
void InitDnsPrefetch(size_t max_concurrent, PrefService* user_prefs);
// Cancel pending lookup requests and don't make new ones. Does nothing
// if dns prefetching has not been initialized (to simplify its usage).
void EnsureDnsPrefetchShutdown();
// Free all resources allocated by InitDnsPrefetch. After that you must not call
// any function from this file.
void FreeDnsPrefetchResources();
// Lazily allocates a HostResolver to be used by the DNS prefetch system, on
// the IO thread. Must be matched by a call to FreeGlobalHostResolver().
net::HostResolver* GetGlobalHostResolver();
// Frees the HostResolver allocated by GetGlobalHostResolver(). Must be called
// on the IO thread.
void FreeGlobalHostResolver();
//------------------------------------------------------------------------------
// Global APIs relating to Prefetching in browser
void EnableDnsPrefetch(bool enable);
void RegisterPrefs(PrefService* local_state);
void RegisterUserPrefs(PrefService* user_prefs);
// Renderer bundles up list and sends to this browser API via IPC.
void DnsPrefetchList(const NameList& hostnames);
// This API is used by the autocomplete popup box (as user types).
void DnsPrefetchUrl(const GURL& url);
void DnsPrefetchGetHtmlInfo(std::string* output);
//------------------------------------------------------------------------------
// Save the hostnames actually used at the start of this session to prefetch
// during the next startup.
void SaveHostNamesForNextStartup(PrefService* local_state);
void DnsPrefetchHostNamesAtStartup(PrefService* user_prefs,
PrefService* local_state);
// Functions to save and restore sub-resource references.
void SaveSubresourceReferrers(PrefService* local_state);
void RestoreSubresourceReferrers(PrefService* local_state);
void TrimSubresourceReferrers();
//------------------------------------------------------------------------------
// Helper class to handle global init and shutdown.
class DnsPrefetcherInit {
public:
// Too many concurrent lookups negate benefits of prefetching by trashing the
// OS cache before all resource loading is complete. This is the default.
static const size_t kMaxConcurrentLookups;
DnsPrefetcherInit(size_t max_concurrent, PrefService* user_prefs) {
InitDnsPrefetch(max_concurrent, user_prefs);
}
~DnsPrefetcherInit() {
FreeDnsPrefetchResources();
}
private:
DISALLOW_COPY_AND_ASSIGN(DnsPrefetcherInit);
};
} // namespace chrome_browser_net
#endif // CHROME_BROWSER_NET_DNS_GLOBAL_H_
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