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

Issue 1407233017: Define a Java-side global application context. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 1 month 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
11 #include <string> 11 #include <string>
12 12
13 #include "base/android/context_utils.h"
13 #include "base/android/scoped_java_ref.h" 14 #include "base/android/scoped_java_ref.h"
14 #include "base/atomicops.h" 15 #include "base/atomicops.h"
15 #include "base/base_export.h" 16 #include "base/base_export.h"
16 #include "base/compiler_specific.h" 17 #include "base/compiler_specific.h"
17 18
18 namespace base { 19 namespace base {
19 namespace android { 20 namespace android {
20 21
21 // Used to mark symbols to be exported in a shared library's symbol table. 22 // Used to mark symbols to be exported in a shared library's symbol table.
22 #define JNI_EXPORT __attribute__ ((visibility("default"))) 23 #define JNI_EXPORT __attribute__ ((visibility("default")))
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40 // Same to AttachCurrentThread except that thread name will be set to 41 // Same to AttachCurrentThread except that thread name will be set to
41 // |thread_name| if it is the first call. Otherwise, thread_name won't be 42 // |thread_name| if it is the first call. Otherwise, thread_name won't be
42 // changed. AttachCurrentThread() doesn't regard underlying platform thread 43 // changed. AttachCurrentThread() doesn't regard underlying platform thread
43 // name, but just resets it to "Thread-???". This function should be called 44 // name, but just resets it to "Thread-???". This function should be called
44 // right after new thread is created if it is important to keep thread name. 45 // right after new thread is created if it is important to keep thread name.
45 BASE_EXPORT JNIEnv* AttachCurrentThreadWithName(const std::string& thread_name); 46 BASE_EXPORT JNIEnv* AttachCurrentThreadWithName(const std::string& thread_name);
46 47
47 // Detaches the current thread from VM if it is attached. 48 // Detaches the current thread from VM if it is attached.
48 BASE_EXPORT void DetachFromVM(); 49 BASE_EXPORT void DetachFromVM();
49 50
50 // Initializes the global JVM. It is not necessarily called before 51 // Initializes the global JVM.
51 // InitApplicationContext().
52 BASE_EXPORT void InitVM(JavaVM* vm); 52 BASE_EXPORT void InitVM(JavaVM* vm);
53 53
54 // Returns true if the global JVM has been initialized. 54 // Returns true if the global JVM has been initialized.
55 BASE_EXPORT bool IsVMInitialized(); 55 BASE_EXPORT bool IsVMInitialized();
56 56
57 // Initializes the global application context object. The |context| can be any
58 // valid reference to the application context. Internally holds a global ref to
59 // the context. InitVM and InitApplicationContext maybe called in either order.
60 BASE_EXPORT void InitApplicationContext(JNIEnv* env,
61 const JavaRef<jobject>& context);
62
63 // Initializes the global ClassLoader used by the GetClass and LazyGetClass 57 // Initializes the global ClassLoader used by the GetClass and LazyGetClass
64 // methods. This is needed because JNI will use the base ClassLoader when there 58 // methods. This is needed because JNI will use the base ClassLoader when there
65 // is no Java code on the stack. The base ClassLoader doesn't know about any of 59 // is no Java code on the stack. The base ClassLoader doesn't know about any of
66 // the application classes and will fail to lookup anything other than system 60 // the application classes and will fail to lookup anything other than system
67 // classes. 61 // classes.
68 BASE_EXPORT void InitReplacementClassLoader( 62 BASE_EXPORT void InitReplacementClassLoader(
69 JNIEnv* env, 63 JNIEnv* env,
70 const JavaRef<jobject>& class_loader); 64 const JavaRef<jobject>& class_loader);
71 65
72 // Gets a global ref to the application context set with
73 // InitApplicationContext(). Ownership is retained by the function - the caller
74 // must NOT release it.
75 const BASE_EXPORT jobject GetApplicationContext();
76
77 // Finds the class named |class_name| and returns it. 66 // Finds the class named |class_name| and returns it.
78 // Use this method instead of invoking directly the JNI FindClass method (to 67 // Use this method instead of invoking directly the JNI FindClass method (to
79 // prevent leaking local references). 68 // prevent leaking local references).
80 // This method triggers a fatal assertion if the class could not be found. 69 // This method triggers a fatal assertion if the class could not be found.
81 // Use HasClass if you need to check whether the class exists. 70 // Use HasClass if you need to check whether the class exists.
82 BASE_EXPORT ScopedJavaLocalRef<jclass> GetClass(JNIEnv* env, 71 BASE_EXPORT ScopedJavaLocalRef<jclass> GetClass(JNIEnv* env,
83 const char* class_name); 72 const char* class_name);
84 73
85 // The method will initialize |atomic_class_id| to contain a global ref to the 74 // The method will initialize |atomic_class_id| to contain a global ref to the
86 // class. And will return that ref on subsequent calls. It's the caller's 75 // class. And will return that ref on subsequent calls. It's the caller's
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131 BASE_EXPORT void CheckException(JNIEnv* env); 120 BASE_EXPORT void CheckException(JNIEnv* env);
132 121
133 // This returns a string representation of the java stack trace. 122 // This returns a string representation of the java stack trace.
134 BASE_EXPORT std::string GetJavaExceptionInfo(JNIEnv* env, 123 BASE_EXPORT std::string GetJavaExceptionInfo(JNIEnv* env,
135 jthrowable java_throwable); 124 jthrowable java_throwable);
136 125
137 } // namespace android 126 } // namespace android
138 } // namespace base 127 } // namespace base
139 128
140 #endif // BASE_ANDROID_JNI_ANDROID_H_ 129 #endif // BASE_ANDROID_JNI_ANDROID_H_
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