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Side by Side Diff: base/android/jni_android.h

Issue 472553002: Make class lookup lazy in jni_generator when using lazy method lookup. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 4 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef BASE_ANDROID_JNI_ANDROID_H_ 5 #ifndef BASE_ANDROID_JNI_ANDROID_H_
6 #define BASE_ANDROID_JNI_ANDROID_H_ 6 #define BASE_ANDROID_JNI_ANDROID_H_
7 7
8 #include <jni.h> 8 #include <jni.h>
9 #include <sys/types.h> 9 #include <sys/types.h>
10 10
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46 46
47 // Returns true if the global JVM has been initialized. 47 // Returns true if the global JVM has been initialized.
48 BASE_EXPORT bool IsVMInitialized(); 48 BASE_EXPORT bool IsVMInitialized();
49 49
50 // Initializes the global application context object. The |context| can be any 50 // Initializes the global application context object. The |context| can be any
51 // valid reference to the application context. Internally holds a global ref to 51 // valid reference to the application context. Internally holds a global ref to
52 // the context. InitVM and InitApplicationContext maybe called in either order. 52 // the context. InitVM and InitApplicationContext maybe called in either order.
53 BASE_EXPORT void InitApplicationContext(JNIEnv* env, 53 BASE_EXPORT void InitApplicationContext(JNIEnv* env,
54 const JavaRef<jobject>& context); 54 const JavaRef<jobject>& context);
55 55
56 // Initializes the global ClassLoader used by the GetClass and LazyGetClass
57 // methods. This is needed because JNI will use the base ClassLoader when there
58 // is no Java code on the stack. The base ClassLoader doesn't know about any of
59 // the application classes and will fail to lookup anything other than system
60 // classes.
61 BASE_EXPORT void InitReplacementClassLoader(
62 JNIEnv* env,
63 const JavaRef<jobject>& class_loader);
64
56 // Gets a global ref to the application context set with 65 // Gets a global ref to the application context set with
57 // InitApplicationContext(). Ownership is retained by the function - the caller 66 // InitApplicationContext(). Ownership is retained by the function - the caller
58 // must NOT release it. 67 // must NOT release it.
59 const BASE_EXPORT jobject GetApplicationContext(); 68 const BASE_EXPORT jobject GetApplicationContext();
60 69
61 // Finds the class named |class_name| and returns it. 70 // Finds the class named |class_name| and returns it.
62 // Use this method instead of invoking directly the JNI FindClass method (to 71 // Use this method instead of invoking directly the JNI FindClass method (to
63 // prevent leaking local references). 72 // prevent leaking local references).
64 // This method triggers a fatal assertion if the class could not be found. 73 // This method triggers a fatal assertion if the class could not be found.
65 // Use HasClass if you need to check whether the class exists. 74 // Use HasClass if you need to check whether the class exists.
66 BASE_EXPORT ScopedJavaLocalRef<jclass> GetClass(JNIEnv* env, 75 BASE_EXPORT ScopedJavaLocalRef<jclass> GetClass(JNIEnv* env,
67 const char* class_name); 76 const char* class_name);
68 77
78 // The method will initialize |atomic_class_id| to contain a global ref to the
79 // class. And will return that ref on subsequent calls. It's the caller's
80 // responsibility to release the ref when it is no longer needed.
81 // The caller is responsible to zero-initialize |atomic_method_id|.
82 // It's fine to simultaneously call this on multiple threads referencing the
83 // same |atomic_method_id|.
84 BASE_EXPORT jclass LazyGetClass(
85 JNIEnv* env,
86 const char* class_name,
87 base::subtle::AtomicWord* atomic_class_id);
88
69 // This class is a wrapper for JNIEnv Get(Static)MethodID. 89 // This class is a wrapper for JNIEnv Get(Static)MethodID.
70 class BASE_EXPORT MethodID { 90 class BASE_EXPORT MethodID {
71 public: 91 public:
72 enum Type { 92 enum Type {
73 TYPE_STATIC, 93 TYPE_STATIC,
74 TYPE_INSTANCE, 94 TYPE_INSTANCE,
75 }; 95 };
76 96
77 // Returns the method ID for the method with the specified name and signature. 97 // Returns the method ID for the method with the specified name and signature.
78 // This method triggers a fatal assertion if the method could not be found. 98 // This method triggers a fatal assertion if the method could not be found.
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100 // and returns true. 120 // and returns true.
101 BASE_EXPORT bool ClearException(JNIEnv* env); 121 BASE_EXPORT bool ClearException(JNIEnv* env);
102 122
103 // This function will call CHECK() macro if there's any pending exception. 123 // This function will call CHECK() macro if there's any pending exception.
104 BASE_EXPORT void CheckException(JNIEnv* env); 124 BASE_EXPORT void CheckException(JNIEnv* env);
105 125
106 } // namespace android 126 } // namespace android
107 } // namespace base 127 } // namespace base
108 128
109 #endif // BASE_ANDROID_JNI_ANDROID_H_ 129 #endif // BASE_ANDROID_JNI_ANDROID_H_
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