bb474e9a02
Summary: This is my latest round of changes to add missing items to RocksJava. More to come in future PRs. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4833 Differential Revision: D14152266 Pulled By: sagar0 fbshipit-source-id: d6cff67e26da06c131491b5cf6911a8cd0db0775
101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
// 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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#include <jni.h>
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#include <map>
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#include <string>
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#include <unordered_set>
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#include <vector>
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#include "include/org_rocksdb_MemoryUtil.h"
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#include "rocksjni/portal.h"
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#include "rocksdb/utilities/memory_util.h"
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/*
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* Class: org_rocksdb_MemoryUtil
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* Method: getApproximateMemoryUsageByType
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* Signature: ([J[J)Ljava/util/Map;
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*/
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jobject Java_org_rocksdb_MemoryUtil_getApproximateMemoryUsageByType(
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JNIEnv *env, jclass /*jclazz*/, jlongArray jdb_handles, jlongArray jcache_handles) {
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std::vector<rocksdb::DB*> dbs;
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jsize db_handle_count = env->GetArrayLength(jdb_handles);
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if(db_handle_count > 0) {
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jlong *ptr_jdb_handles = env->GetLongArrayElements(jdb_handles, nullptr);
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if (ptr_jdb_handles == nullptr) {
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// exception thrown: OutOfMemoryError
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return nullptr;
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}
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for (jsize i = 0; i < db_handle_count; i++) {
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dbs.push_back(reinterpret_cast<rocksdb::DB *>(ptr_jdb_handles[i]));
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}
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env->ReleaseLongArrayElements(jdb_handles, ptr_jdb_handles, JNI_ABORT);
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}
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std::unordered_set<const rocksdb::Cache*> cache_set;
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jsize cache_handle_count = env->GetArrayLength(jcache_handles);
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if(cache_handle_count > 0) {
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jlong *ptr_jcache_handles = env->GetLongArrayElements(jcache_handles, nullptr);
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if (ptr_jcache_handles == nullptr) {
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// exception thrown: OutOfMemoryError
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return nullptr;
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}
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for (jsize i = 0; i < cache_handle_count; i++) {
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auto *cache_ptr =
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reinterpret_cast<std::shared_ptr<rocksdb::Cache> *>(ptr_jcache_handles[i]);
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cache_set.insert(cache_ptr->get());
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}
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env->ReleaseLongArrayElements(jcache_handles, ptr_jcache_handles, JNI_ABORT);
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}
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std::map<rocksdb::MemoryUtil::UsageType, uint64_t> usage_by_type;
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if(rocksdb::MemoryUtil::GetApproximateMemoryUsageByType(dbs, cache_set, &usage_by_type) != rocksdb::Status::OK()) {
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// Non-OK status
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return nullptr;
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}
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jobject jusage_by_type = rocksdb::HashMapJni::construct(
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env, static_cast<uint32_t>(usage_by_type.size()));
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if (jusage_by_type == nullptr) {
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// exception occurred
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return nullptr;
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}
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const rocksdb::HashMapJni::FnMapKV<const rocksdb::MemoryUtil::UsageType, const uint64_t, jobject, jobject>
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fn_map_kv =
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[env](const std::pair<rocksdb::MemoryUtil::UsageType, uint64_t>& pair) {
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// Construct key
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const jobject jusage_type =
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rocksdb::ByteJni::valueOf(env, rocksdb::MemoryUsageTypeJni::toJavaMemoryUsageType(pair.first));
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if (jusage_type == nullptr) {
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// an error occurred
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return std::unique_ptr<std::pair<jobject, jobject>>(nullptr);
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}
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// Construct value
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const jobject jusage_value =
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rocksdb::LongJni::valueOf(env, pair.second);
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if (jusage_value == nullptr) {
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// an error occurred
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return std::unique_ptr<std::pair<jobject, jobject>>(nullptr);
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}
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// Construct and return pointer to pair of jobjects
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return std::unique_ptr<std::pair<jobject, jobject>>(
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new std::pair<jobject, jobject>(jusage_type,
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jusage_value));
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};
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if (!rocksdb::HashMapJni::putAll(env, jusage_by_type, usage_by_type.begin(),
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usage_by_type.end(), fn_map_kv)) {
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// exception occcurred
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jusage_by_type = nullptr;
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}
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return jusage_by_type;
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}
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