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// Copyright (c) 2010 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_PROXY_SYNC_HOST_RESOLVER_BRIDGE_H_
#define NET_PROXY_SYNC_HOST_RESOLVER_BRIDGE_H_
#include "base/lock.h"
#include "base/scoped_ptr.h"
#include "base/waitable_event.h"
#include "net/base/host_resolver.h"
#include "net/proxy/single_threaded_proxy_resolver.h"
class MessageLoop;
namespace net {
// Wrapper around HostResolver to give a sync API while running the resolver
// in async mode on |host_resolver_loop|.
class SyncHostResolverBridge : public HostResolver {
public:
SyncHostResolverBridge(HostResolver* host_resolver,
MessageLoop* host_resolver_loop);
virtual ~SyncHostResolverBridge();
// HostResolver methods:
virtual int Resolve(const RequestInfo& info,
AddressList* addresses,
CompletionCallback* callback,
RequestHandle* out_req,
const BoundNetLog& net_log);
virtual void CancelRequest(RequestHandle req);
virtual void AddObserver(Observer* observer);
virtual void RemoveObserver(Observer* observer);
// The Shutdown() method should be called prior to destruction, from
// |host_resolver_loop_|. It aborts any in progress synchronous resolves, to
// prevent deadlocks from happening.
void Shutdown();
private:
// Called on |host_resolver_loop_|.
void StartResolve(const HostResolver::RequestInfo& info,
net::AddressList* addresses);
// Called on |host_resolver_loop_|.
void OnResolveCompletion(int result);
// Returns true if Shutdown() has been called.
bool HasShutdown() const {
AutoLock l(lock_);
return has_shutdown_;
}
scoped_refptr<HostResolver> host_resolver_;
MessageLoop* host_resolver_loop_;
// Event to notify completion of resolve request.
base::WaitableEvent event_;
// Callback for when the resolve completes on host_resolver_loop_.
net::CompletionCallbackImpl<SyncHostResolverBridge> callback_;
// The result from the current request (set on |host_resolver_loop_|).
int err_;
// The currently outstanding request to |host_resolver_|, or NULL.
HostResolver::RequestHandle outstanding_request_;
// True if Shutdown() has been called. Must hold |lock_| to access it.
bool has_shutdown_;
// Mutex to guard accesses to |has_shutdown_|.
mutable Lock lock_;
};
// Subclass of SingleThreadedProxyResolver that additionally calls
// |bridged_host_resolver_->Shutdown()| during its destructor.
class SingleThreadedProxyResolverUsingBridgedHostResolver
: public SingleThreadedProxyResolver {
public:
SingleThreadedProxyResolverUsingBridgedHostResolver(
ProxyResolver* proxy_resolver,
SyncHostResolverBridge* bridged_host_resolver);
virtual ~SingleThreadedProxyResolverUsingBridgedHostResolver();
private:
scoped_refptr<SyncHostResolverBridge> bridged_host_resolver_;
};
} // namespace net
#endif // NET_PROXY_SYNC_HOST_RESOLVER_BRIDGE_H_
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