/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef JNI_INVOCATION_H_included
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#define JNI_INVOCATION_H_included
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#include <jni.h>
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#include "module_api.h"
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struct JniInvocationImpl;
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MODULE_API struct JniInvocationImpl* JniInvocationCreate();
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MODULE_API void JniInvocationDestroy(struct JniInvocationImpl* instance);
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MODULE_API int JniInvocationInit(struct JniInvocationImpl* instance, const char* library);
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MODULE_API const char* JniInvocationGetLibrary(const char* library, char* buffer);
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#ifdef __cplusplus
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// JniInvocation adds a layer of indirection for applications using
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// the JNI invocation API to allow the JNI implementation to be
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// selected dynamically. Apps can specify a specific implementation to
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// be used by calling InitJniInvocation. If this is not done, the
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// library will chosen based on the value of Android system property
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// persist.sys.dalvik.vm.lib on the device, and otherwise fall back to
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// a hard-coded default implementation.
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class JniInvocation final {
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public:
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JniInvocation() {
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impl_ = JniInvocationCreate();
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}
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~JniInvocation() {
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JniInvocationDestroy(impl_);
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}
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// Initialize JNI invocation API. library should specifiy a valid
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// shared library for opening via dlopen providing a JNI invocation
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// implementation, or null to allow defaulting via
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// persist.sys.dalvik.vm.lib.
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bool Init(const char* library) {
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return JniInvocationInit(impl_, library) != 0;
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}
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// Exposes which library is actually loaded from the given name. The
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// buffer of size PROPERTY_VALUE_MAX will be used to load the system
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// property for the default library, if necessary. If no buffer is
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// provided, the fallback value will be used.
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static const char* GetLibrary(const char* library, char* buffer) {
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return JniInvocationGetLibrary(library, buffer);
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}
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private:
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JniInvocation(const JniInvocation&) = delete;
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JniInvocation& operator=(const JniInvocation&) = delete;
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static const char* GetLibrary(const char* library, char* buffer, bool (*is_debuggable)(),
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int (*get_library_system_property)(char* buffer));
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JniInvocationImpl* impl_;
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friend class JNIInvocation_Debuggable_Test;
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friend class JNIInvocation_NonDebuggable_Test;
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};
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#endif // __cplusplus
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#endif // JNI_INVOCATION_H_included
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