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