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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// This file implements the callback "bridge" between Java and C++ for
// ROCKSDB_NAMESPACE::TableFilter.
#include "rocksjni/table_filter_jnicallback.h"
#include "rocksjni/portal.h"
namespace ROCKSDB_NAMESPACE {
TableFilterJniCallback::TableFilterJniCallback(JNIEnv* env,
jobject jtable_filter)
: JniCallback(env, jtable_filter) {
m_jfilter_methodid = AbstractTableFilterJni::getFilterMethod(env);
if (m_jfilter_methodid == nullptr) {
// exception thrown: NoSuchMethodException or OutOfMemoryError
return;
}
// create the function reference
/*
Note the JNI ENV must be obtained/release
on each call to the function itself as
it may be called from multiple threads
*/
m_table_filter_function =
[this](const ROCKSDB_NAMESPACE::TableProperties& table_properties) {
jboolean attached_thread = JNI_FALSE;
JNIEnv* thread_env = getJniEnv(&attached_thread);
assert(thread_env != nullptr);
// create a Java TableProperties object
jobject jtable_properties = TablePropertiesJni::fromCppTableProperties(
thread_env, table_properties);
if (jtable_properties == nullptr) {
// exception thrown from fromCppTableProperties
thread_env->ExceptionDescribe(); // print out exception to stderr
releaseJniEnv(attached_thread);
return false;
}
jboolean result = thread_env->CallBooleanMethod(
m_jcallback_obj, m_jfilter_methodid, jtable_properties);
if (thread_env->ExceptionCheck()) {
// exception thrown from CallBooleanMethod
thread_env->DeleteLocalRef(jtable_properties);
thread_env->ExceptionDescribe(); // print out exception to stderr
releaseJniEnv(attached_thread);
return false;
}
// ok... cleanup and then return
releaseJniEnv(attached_thread);
return static_cast<bool>(result);
};
}
std::function<bool(const ROCKSDB_NAMESPACE::TableProperties&)>
TableFilterJniCallback::GetTableFilterFunction() {
return m_table_filter_function;
}
} // namespace ROCKSDB_NAMESPACE
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