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// Copyright (c) 2013 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_PROXY_RESOLVER_V8_TRACING_H_
#define NET_PROXY_PROXY_RESOLVER_V8_TRACING_H_
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "net/base/net_export.h"
#include "net/proxy/proxy_resolver.h"
namespace base {
class Thread;
class MessageLoopProxy;
} // namespace base
namespace net {
class HostResolver;
class NetLog;
class ProxyResolverErrorObserver;
class ProxyResolverV8;
// ProxyResolverV8Tracing is a non-blocking ProxyResolver. It executes
// ProxyResolverV8 on a single helper thread, and does some magic to avoid
// blocking in DNS. For more details see the design document:
// https://docs.google.com/a/google.com/document/d/16Ij5OcVnR3s0MH4Z5XkhI9VTPoMJdaBn9rKreAmGOdE/edit?pli=1
class NET_EXPORT_PRIVATE ProxyResolverV8Tracing
: public ProxyResolver,
NON_EXPORTED_BASE(public base::NonThreadSafe) {
public:
// Constructs a ProxyResolver that will issue DNS requests through
// |host_resolver|, forward Javascript errors through |error_observer|, and
// log Javascript errors and alerts to |net_log|.
//
// Note that the constructor takes ownership of |error_observer|, whereas
// |host_resolver| and |net_log| are expected to outlive |this|.
ProxyResolverV8Tracing(HostResolver* host_resolver,
ProxyResolverErrorObserver* error_observer,
NetLog* net_log);
virtual ~ProxyResolverV8Tracing();
// ProxyResolver implementation:
virtual int GetProxyForURL(const GURL& url,
ProxyInfo* results,
const CompletionCallback& callback,
RequestHandle* request,
const BoundNetLog& net_log) OVERRIDE;
virtual void CancelRequest(RequestHandle request) OVERRIDE;
virtual LoadState GetLoadState(RequestHandle request) const OVERRIDE;
virtual void CancelSetPacScript() OVERRIDE;
virtual void PurgeMemory() OVERRIDE;
virtual int SetPacScript(
const scoped_refptr<ProxyResolverScriptData>& script_data,
const CompletionCallback& callback) OVERRIDE;
private:
class Job;
// The worker thread on which the ProxyResolverV8 will be run.
scoped_ptr<base::Thread> thread_;
scoped_ptr<ProxyResolverV8> v8_resolver_;
// Non-owned host resolver, which is to be operated on the origin thread.
HostResolver* host_resolver_;
scoped_ptr<ProxyResolverErrorObserver> error_observer_;
NetLog* net_log_;
// The outstanding SetPacScript operation, or NULL.
scoped_refptr<Job> set_pac_script_job_;
// The number of outstanding (non-cancelled) jobs.
int num_outstanding_callbacks_;
DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8Tracing);
};
} // namespace net
#endif // NET_PROXY_PROXY_RESOLVER_V8_TRACING_H_
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