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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::CompactionFilterFactory.
#include "rocksjni/compaction_filter_factory_jnicallback.h"
#include "rocksjni/portal.h"
namespace ROCKSDB_NAMESPACE {
CompactionFilterFactoryJniCallback::CompactionFilterFactoryJniCallback(
JNIEnv* env, jobject jcompaction_filter_factory)
: JniCallback(env, jcompaction_filter_factory) {
// Note: The name of a CompactionFilterFactory will not change during
// it's lifetime, so we cache it in a global var
jmethodID jname_method_id =
AbstractCompactionFilterFactoryJni::getNameMethodId(env);
if (jname_method_id == nullptr) {
// exception thrown: NoSuchMethodException or OutOfMemoryError
return;
}
jstring jname =
(jstring)env->CallObjectMethod(m_jcallback_obj, jname_method_id);
if (env->ExceptionCheck()) {
// exception thrown
return;
}
jboolean has_exception = JNI_FALSE;
m_name =
JniUtil::copyString(env, jname, &has_exception); // also releases jname
if (has_exception == JNI_TRUE) {
// exception thrown
return;
}
m_jcreate_compaction_filter_methodid =
AbstractCompactionFilterFactoryJni::getCreateCompactionFilterMethodId(
env);
if (m_jcreate_compaction_filter_methodid == nullptr) {
// exception thrown: NoSuchMethodException or OutOfMemoryError
return;
}
}
const char* CompactionFilterFactoryJniCallback::Name() const {
return m_name.get();
}
std::unique_ptr<CompactionFilter>
CompactionFilterFactoryJniCallback::CreateCompactionFilter(
const CompactionFilter::Context& context) {
jboolean attached_thread = JNI_FALSE;
JNIEnv* env = getJniEnv(&attached_thread);
assert(env != nullptr);
jlong addr_compaction_filter =
env->CallLongMethod(m_jcallback_obj, m_jcreate_compaction_filter_methodid,
static_cast<jboolean>(context.is_full_compaction),
static_cast<jboolean>(context.is_manual_compaction));
if (env->ExceptionCheck()) {
// exception thrown from CallLongMethod
env->ExceptionDescribe(); // print out exception to stderr
releaseJniEnv(attached_thread);
return nullptr;
}
auto* cff = reinterpret_cast<CompactionFilter*>(addr_compaction_filter);
releaseJniEnv(attached_thread);
return std::unique_ptr<CompactionFilter>(cff);
}
} // namespace ROCKSDB_NAMESPACE
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