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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2015 ZeroTier, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#include "ZT1_jnicache.h"
#include "ZT1_jniutils.h"
JniCache::JniCache()
: m_jvm(NULL)
, m_classes()
, m_fields()
, m_staticFields()
, m_methods()
, m_staticMethods()
{
LOGV("JNI Cache Created");
}
JniCache::JniCache(JavaVM *jvm)
: m_jvm(jvm)
, m_classes()
, m_fields()
, m_staticFields()
, m_methods()
, m_staticMethods()
{
LOGV("JNI Cache Created");
}
JniCache::~JniCache()
{
LOGV("JNI Cache Destroyed");
clearCache();
}
void JniCache::clearCache()
{
if(m_jvm)
{
JNIEnv *env = NULL;
if(m_jvm->GetEnv((void**)&env, JNI_VERSION_1_6) != JNI_OK)
return;
for(ClassMap::iterator iter = m_classes.begin(), end = m_classes.end();
iter != end; ++iter)
{
env->DeleteGlobalRef(iter->second);
}
}
m_classes.clear();
m_fields.clear();
m_staticFields.clear();
m_methods.clear();
m_staticMethods.clear();
}
void JniCache::setJavaVM(JavaVM *jvm)
{
LOGV("Assigned JVM to object");
m_jvm = jvm;
}
jclass JniCache::findClass(const std::string &name)
{
if(!m_jvm)
return NULL;
ClassMap::iterator found = m_classes.find(name);
if(found == m_classes.end())
{
// get the class from the JVM
JNIEnv *env = NULL;
if(m_jvm->GetEnv((void**)&env, JNI_VERSION_1_6) != JNI_OK)
{
LOGE("Error retreiving JNI Environment");
return NULL;
}
jclass localCls = env->FindClass(name.c_str());
if(env->ExceptionCheck())
{
LOGE("Error finding class: %s", name.c_str());
return NULL;
}
jclass cls = (jclass)env->NewGlobalRef(localCls);
m_classes.insert(std::make_pair(name, cls));
return cls;
}
LOGV("Returning cached %s", name.c_str());
return found->second;
}
jmethodID JniCache::findMethod(jclass cls, const std::string &methodName, const std::string &methodSig)
{
if(!m_jvm)
return NULL;
std::string id = methodName + methodSig;
MethodMap::iterator found = m_methods.find(id);
if(found == m_methods.end())
{
JNIEnv *env = NULL;
if(m_jvm->GetEnv((void**)&env, JNI_VERSION_1_6) != JNI_OK)
{
return NULL;
}
jmethodID mid = env->GetMethodID(cls, methodName.c_str(), methodSig.c_str());
if(env->ExceptionCheck())
{
return NULL;
}
m_methods.insert(std::make_pair(id, mid));
return mid;
}
return found->second;
}
jmethodID JniCache::findStaticMethod(jclass cls, const std::string &methodName, const std::string &methodSig)
{
if(!m_jvm)
return NULL;
std::string id = methodName + methodSig;
MethodMap::iterator found = m_staticMethods.find(id);
if(found == m_staticMethods.end())
{
JNIEnv *env = NULL;
if(m_jvm->GetEnv((void**)&env, JNI_VERSION_1_6) != JNI_OK)
{
return NULL;
}
jmethodID mid = env->GetStaticMethodID(cls, methodName.c_str(), methodSig.c_str());
if(env->ExceptionCheck())
{
return NULL;
}
m_staticMethods.insert(std::make_pair(id, mid));
return mid;
}
return found->second;
}
jfieldID JniCache::findField(jclass cls, const std::string &fieldName, const std::string &typeStr)
{
if(!m_jvm)
return NULL;
std::string id = fieldName + typeStr;
FieldMap::iterator found = m_fields.find(id);
if(found == m_fields.end())
{
JNIEnv *env = NULL;
if(m_jvm->GetEnv((void**)&env, JNI_VERSION_1_6) != JNI_OK)
{
return NULL;
}
jfieldID fid = env->GetFieldID(cls, fieldName.c_str(), typeStr.c_str());
if(env->ExceptionCheck())
{
return NULL;
}
m_fields.insert(std::make_pair(id, fid));
return fid;
}
return found->second;
}
jfieldID JniCache::findStaticField(jclass cls, const std::string &fieldName, const std::string &typeStr)
{
if(!m_jvm)
return NULL;
std::string id = fieldName + typeStr;
FieldMap::iterator found = m_staticFields.find(id);
if(found == m_staticFields.end())
{
JNIEnv *env = NULL;
if(m_jvm->GetEnv((void**)&env, JNI_VERSION_1_6) != JNI_OK)
{
return NULL;
}
jfieldID fid = env->GetStaticFieldID(cls, fieldName.c_str(), typeStr.c_str());
if(env->ExceptionCheck())
{
return NULL;
}
m_staticFields.insert(std::make_pair(id, fid));
return fid;
}
return found->second;
}
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