1 /* 2 * Copyright (C) 2013 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef ScriptPromiseResolver_h 32 #define ScriptPromiseResolver_h 33 34 #include "bindings/v8/DOMWrapperWorld.h" 35 #include "bindings/v8/ScopedPersistent.h" 36 #include "bindings/v8/ScriptObject.h" 37 #include "bindings/v8/ScriptPromise.h" 38 #include "bindings/v8/ScriptState.h" 39 #include "bindings/v8/ScriptValue.h" 40 #include "bindings/v8/V8Binding.h" 41 #include "wtf/RefPtr.h" 42 43 #include <v8.h> 44 45 namespace WebCore { 46 47 class ExecutionContext; 48 49 // ScriptPromiseResolver is a class for performing operations on Promise 50 // (resolve / reject) from C++ world. 51 // ScriptPromiseResolver holds a PromiseResolver. 52 // Here is a typical usage: 53 // 1. Create a ScriptPromiseResolver from a ScriptPromise. 54 // 2. Pass the promise object of the holder to a JavaScript program 55 // (such as XMLHttpRequest return value). 56 // 3. Call resolve or reject when the operation completes or 57 // the operation fails respectively. 58 // 59 // Most methods including constructors must be called within a v8 context. 60 // To use ScriptPromiseResolver out of a v8 context the caller must 61 // enter a v8 context, for example by using ScriptScope and ScriptState. 62 // 63 // To prevent memory leaks, you should release the reference manually 64 // by calling resolve or reject. 65 // Destroying the object will also release the reference. 66 // 67 class ScriptPromiseResolver : public RefCounted<ScriptPromiseResolver> { 68 WTF_MAKE_NONCOPYABLE(ScriptPromiseResolver); 69 public: 70 static PassRefPtr<ScriptPromiseResolver> create(ScriptPromise, ExecutionContext*); 71 static PassRefPtr<ScriptPromiseResolver> create(ScriptPromise); 72 73 // A ScriptPromiseResolver should be resolved / rejected before 74 // its destruction. 75 // A ScriptPromiseResolver can be destructed safely without 76 // entering a v8 context. 77 ~ScriptPromiseResolver(); 78 79 // Return true if the promise object is in pending state. 80 bool isPending() const; 81 82 ScriptPromise promise() 83 { 84 ASSERT(m_promise.isolate()->InContext()); 85 return m_promise; 86 } 87 88 // To use following template methods, T must be a DOM class. 89 90 // This method will be implemented by the code generator. 91 template<typename T> 92 void resolve(T* value, v8::Handle<v8::Object> creationContext) { resolve(toV8NoInline(value, creationContext, m_isolate)); } 93 template<typename T> 94 void reject(T* value, v8::Handle<v8::Object> creationContext) { reject(toV8NoInline(value, creationContext, m_isolate)); } 95 96 template<typename T> 97 void resolve(PassRefPtr<T> value, v8::Handle<v8::Object> creationContext) { resolve(value.get(), creationContext); } 98 template<typename T> 99 void reject(PassRefPtr<T> value, v8::Handle<v8::Object> creationContext) { reject(value.get(), creationContext); } 100 101 template<typename T> 102 inline void resolve(T* value, ExecutionContext*); 103 template<typename T> 104 inline void reject(T* value, ExecutionContext*); 105 106 template<typename T> 107 void resolve(PassRefPtr<T> value, ExecutionContext* context) { resolve(value.get(), context); } 108 template<typename T> 109 void reject(PassRefPtr<T> value, ExecutionContext* context) { reject(value.get(), context); } 110 111 template<typename T> 112 inline void resolve(T* value); 113 template<typename T> 114 inline void reject(T* value); 115 116 template<typename T> 117 void resolve(PassRefPtr<T> value) { resolve(value.get()); } 118 template<typename T> 119 void reject(PassRefPtr<T> value) { reject(value.get()); } 120 121 void resolve(ScriptValue); 122 void reject(ScriptValue); 123 124 private: 125 ScriptPromiseResolver(ScriptPromise); 126 void resolve(v8::Handle<v8::Value>); 127 void reject(v8::Handle<v8::Value>); 128 129 v8::Isolate* m_isolate; 130 ScriptPromise m_promise; 131 }; 132 133 template<typename T> 134 void ScriptPromiseResolver::resolve(T* value, ExecutionContext* context) 135 { 136 ASSERT(m_isolate->InContext()); 137 v8::Handle<v8::Context> v8Context = toV8Context(context, DOMWrapperWorld::current()); 138 resolve(value, v8Context->Global()); 139 } 140 141 template<typename T> 142 void ScriptPromiseResolver::reject(T* value, ExecutionContext* context) 143 { 144 ASSERT(m_isolate->InContext()); 145 v8::Handle<v8::Context> v8Context = toV8Context(context, DOMWrapperWorld::current()); 146 reject(value, v8Context->Global()); 147 } 148 149 template<typename T> 150 void ScriptPromiseResolver::resolve(T* value) 151 { 152 ASSERT(m_isolate->InContext()); 153 resolve(value, v8::Object::New(m_isolate)); 154 } 155 156 template<typename T> 157 void ScriptPromiseResolver::reject(T* value) 158 { 159 ASSERT(m_isolate->InContext()); 160 reject(value, v8::Object::New(m_isolate)); 161 } 162 163 } // namespace WebCore 164 165 166 #endif // ScriptPromiseResolver_h 167
