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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).
#include <jni.h>
#include <map>
#include <string>
#include <unordered_set>
#include <vector>
#include "include/org_rocksdb_MemoryUtil.h"
#include "rocksjni/portal.h"
#include "rocksdb/utilities/memory_util.h"
/*
* Class: org_rocksdb_MemoryUtil
* Method: getApproximateMemoryUsageByType
* Signature: ([J[J)Ljava/util/Map;
*/
jobject Java_org_rocksdb_MemoryUtil_getApproximateMemoryUsageByType(
JNIEnv *env, jclass /*jclazz*/, jlongArray jdb_handles, jlongArray jcache_handles) {
std::vector<ROCKSDB_NAMESPACE::DB *> dbs;
jsize db_handle_count = env->GetArrayLength(jdb_handles);
if(db_handle_count > 0) {
jlong *ptr_jdb_handles = env->GetLongArrayElements(jdb_handles, nullptr);
if (ptr_jdb_handles == nullptr) {
// exception thrown: OutOfMemoryError
return nullptr;
}
for (jsize i = 0; i < db_handle_count; i++) {
dbs.push_back(
reinterpret_cast<ROCKSDB_NAMESPACE::DB *>(ptr_jdb_handles[i]));
}
env->ReleaseLongArrayElements(jdb_handles, ptr_jdb_handles, JNI_ABORT);
}
std::unordered_set<const ROCKSDB_NAMESPACE::Cache *> cache_set;
jsize cache_handle_count = env->GetArrayLength(jcache_handles);
if(cache_handle_count > 0) {
jlong *ptr_jcache_handles = env->GetLongArrayElements(jcache_handles, nullptr);
if (ptr_jcache_handles == nullptr) {
// exception thrown: OutOfMemoryError
return nullptr;
}
for (jsize i = 0; i < cache_handle_count; i++) {
auto *cache_ptr =
reinterpret_cast<std::shared_ptr<ROCKSDB_NAMESPACE::Cache> *>(
ptr_jcache_handles[i]);
cache_set.insert(cache_ptr->get());
}
env->ReleaseLongArrayElements(jcache_handles, ptr_jcache_handles, JNI_ABORT);
}
std::map<ROCKSDB_NAMESPACE::MemoryUtil::UsageType, uint64_t> usage_by_type;
if (ROCKSDB_NAMESPACE::MemoryUtil::GetApproximateMemoryUsageByType(
dbs, cache_set, &usage_by_type) != ROCKSDB_NAMESPACE::Status::OK()) {
// Non-OK status
return nullptr;
}
jobject jusage_by_type = ROCKSDB_NAMESPACE::HashMapJni::construct(
env, static_cast<uint32_t>(usage_by_type.size()));
if (jusage_by_type == nullptr) {
// exception occurred
return nullptr;
}
const ROCKSDB_NAMESPACE::HashMapJni::FnMapKV<
const ROCKSDB_NAMESPACE::MemoryUtil::UsageType, const uint64_t, jobject,
jobject>
fn_map_kv = [env](
const std::pair<ROCKSDB_NAMESPACE::MemoryUtil::UsageType,
uint64_t> &pair) {
// Construct key
const jobject jusage_type = ROCKSDB_NAMESPACE::ByteJni::valueOf(
env, ROCKSDB_NAMESPACE::MemoryUsageTypeJni::toJavaMemoryUsageType(
pair.first));
if (jusage_type == nullptr) {
// an error occurred
return std::unique_ptr<std::pair<jobject, jobject>>(nullptr);
}
// Construct value
const jobject jusage_value =
ROCKSDB_NAMESPACE::LongJni::valueOf(env, pair.second);
if (jusage_value == nullptr) {
// an error occurred
return std::unique_ptr<std::pair<jobject, jobject>>(nullptr);
}
// Construct and return pointer to pair of jobjects
return std::unique_ptr<std::pair<jobject, jobject>>(
new std::pair<jobject, jobject>(jusage_type,
jusage_value));
};
if (!ROCKSDB_NAMESPACE::HashMapJni::putAll(env, jusage_by_type,
usage_by_type.begin(),
usage_by_type.end(), fn_map_kv)) {
// exception occcurred
jusage_by_type = nullptr;
}
return jusage_by_type;
}
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