talk/app/webrtc/java/jni/classreferenceholder.h

/*
 * libjingle
 * Copyright 2015 Google Inc.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// Android's FindClass() is trickier than usual because the app-specific
// ClassLoader is not consulted when there is no app-specific frame on the
// stack.  Consequently, we only look up all classes once in app/webrtc.
// http://developer.android.com/training/articles/perf-jni.html#faq_FindClass

#ifndef TALK_APP_WEBRTC_JAVA_JNI_CLASSREFERENCEHOLDER_H_
#define TALK_APP_WEBRTC_JAVA_JNI_CLASSREFERENCEHOLDER_H_

#include <jni.h>
#include <map>
#include <string>

namespace webrtc_jni {

// LoadGlobalClassReferenceHolder must be called in JNI_OnLoad.
void LoadGlobalClassReferenceHolder();
// FreeGlobalClassReferenceHolder must be called in JNI_UnLoad.
void FreeGlobalClassReferenceHolder();

// Returns a global reference guaranteed to be valid for the lifetime of the
// process.
jclass FindClass(JNIEnv* jni, const char* name);

// Convenience macro defining JNI-accessible methods in the org.webrtc package.
// Eliminates unnecessary boilerplate and line-wraps, reducing visual clutter.
#define JOW(rettype, name) extern "C" rettype JNIEXPORT JNICALL \
  Java_org_webrtc_##name

}  // namespace webrtc_jni

#endif  // TALK_APP_WEBRTC_JAVA_JNI_CLASSREFERENCEHOLDER_H_