1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_PROXY_PROXY_RESOLVER_V8_H_ 6 #define NET_PROXY_PROXY_RESOLVER_V8_H_ 7 #pragma once 8 #include "proxy_resolver_js_bindings.h" 9 10 #include <utils/String16.h> 11 12 namespace net { 13 14 typedef void* RequestHandle; 15 typedef void* CompletionCallback; 16 17 #define OK 0 18 #define ERR_PAC_SCRIPT_FAILED -1 19 #define ERR_FAILED -2 20 21 class ProxyErrorListener { 22 protected: 23 virtual ~ProxyErrorListener() {} 24 public: 25 virtual void AlertMessage(android::String16 message) = 0; 26 virtual void ErrorMessage(android::String16 error) = 0; 27 }; 28 29 // Implementation of ProxyResolver that uses V8 to evaluate PAC scripts. 30 // 31 // ---------------------------------------------------------------------------- 32 // !!! Important note on threading model: 33 // ---------------------------------------------------------------------------- 34 // There can be only one instance of V8 running at a time. To enforce this 35 // constraint, ProxyResolverV8 holds a v8::Locker during execution. Therefore 36 // it is OK to run multiple instances of ProxyResolverV8 on different threads, 37 // since only one will be running inside V8 at a time. 38 // 39 // It is important that *ALL* instances of V8 in the process be using 40 // v8::Locker. If not there can be race conditions beween the non-locked V8 41 // instances and the locked V8 instances used by ProxyResolverV8 (assuming they 42 // run on different threads). 43 // 44 // This is the case with the V8 instance used by chromium's renderer -- it runs 45 // on a different thread from ProxyResolver (renderer thread vs PAC thread), 46 // and does not use locking since it expects to be alone. 47 class ProxyResolverV8 { 48 public: 49 // Constructs a ProxyResolverV8 with custom bindings. ProxyResolverV8 takes 50 // ownership of |custom_js_bindings| and deletes it when ProxyResolverV8 51 // is destroyed. 52 explicit ProxyResolverV8(ProxyResolverJSBindings* custom_js_bindings, 53 ProxyErrorListener* error_listener); 54 55 virtual ~ProxyResolverV8(); 56 57 ProxyResolverJSBindings* js_bindings() { return js_bindings_; } 58 59 virtual int GetProxyForURL(const android::String16 spec, const android::String16 host, 60 android::String16* results); 61 virtual void PurgeMemory(); 62 virtual int SetPacScript(const android::String16& script_data); 63 64 private: 65 // Context holds the Javascript state for the most recently loaded PAC 66 // script. It corresponds with the data from the last call to 67 // SetPacScript(). 68 class Context; 69 Context* context_; 70 71 ProxyResolverJSBindings* js_bindings_; 72 ProxyErrorListener* error_listener_; 73 }; 74 75 } // namespace net 76 77 #endif // NET_PROXY_PROXY_RESOLVER_V8_H_ 78
