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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_PROXY_RESOLVER_V8_H_
#define NET_PROXY_PROXY_RESOLVER_V8_H_
#pragma once
#include "base/scoped_ptr.h"
#include "net/proxy/proxy_resolver.h"
namespace net {
class ProxyResolverJSBindings;
// Implementation of ProxyResolver that uses V8 to evaluate PAC scripts.
//
// ----------------------------------------------------------------------------
// !!! Important note on threading model:
// ----------------------------------------------------------------------------
// There can be only one instance of V8 running at a time. To enforce this
// constraint, ProxyResolverV8 holds a v8::Locker during execution. Therefore
// it is OK to run multiple instances of ProxyResolverV8 on different threads,
// since only one will be running inside V8 at a time.
//
// It is important that *ALL* instances of V8 in the process be using
// v8::Locker. If not there can be race conditions beween the non-locked V8
// instances and the locked V8 instances used by ProxyResolverV8 (assuming they
// run on different threads).
//
// This is the case with the V8 instance used by chromium's renderer -- it runs
// on a different thread from ProxyResolver (renderer thread vs PAC thread),
// and does not use locking since it expects to be alone.
class ProxyResolverV8 : public ProxyResolver {
public:
// Constructs a ProxyResolverV8 with custom bindings. ProxyResolverV8 takes
// ownership of |custom_js_bindings| and deletes it when ProxyResolverV8
// is destroyed.
explicit ProxyResolverV8(ProxyResolverJSBindings* custom_js_bindings);
virtual ~ProxyResolverV8();
// ProxyResolver implementation:
virtual int GetProxyForURL(const GURL& url,
ProxyInfo* results,
CompletionCallback* /*callback*/,
RequestHandle* /*request*/,
const BoundNetLog& net_log);
virtual void CancelRequest(RequestHandle request);
virtual void PurgeMemory();
virtual void Shutdown();
virtual int SetPacScript(
const scoped_refptr<ProxyResolverScriptData>& script_data,
CompletionCallback* /*callback*/);
ProxyResolverJSBindings* js_bindings() const { return js_bindings_.get(); }
private:
// Context holds the Javascript state for the most recently loaded PAC
// script. It corresponds with the data from the last call to
// SetPacScript().
class Context;
scoped_ptr<Context> context_;
scoped_ptr<ProxyResolverJSBindings> js_bindings_;
DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8);
};
} // namespace net
#endif // NET_PROXY_PROXY_RESOLVER_V8_H_
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