ceph/src/rocksdb/java/rocksjni/lru_cache.cc

   1 // Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5 //
   6 // This file implements the "bridge" between Java and C++ for
   7 // ROCKSDB_NAMESPACE::LRUCache.
   8
   9 #include <jni.h>
  10
  11 #include "cache/lru_cache.h"
  12 #include "include/org_rocksdb_LRUCache.h"
  13
  14 /*
  15  * Class:     org_rocksdb_LRUCache
  16  * Method:    newLRUCache
  17  * Signature: (JIZD)J
  18  */
  19 jlong Java_org_rocksdb_LRUCache_newLRUCache(JNIEnv* /*env*/, jclass /*jcls*/,
  20                                             jlong jcapacity,
  21                                             jint jnum_shard_bits,
  22                                             jboolean jstrict_capacity_limit,
  23                                             jdouble jhigh_pri_pool_ratio) {
  24   auto* sptr_lru_cache = new std::shared_ptr<ROCKSDB_NAMESPACE::Cache>(
  25       ROCKSDB_NAMESPACE::NewLRUCache(
  26           static_cast<size_t>(jcapacity), static_cast<int>(jnum_shard_bits),
  27           static_cast<bool>(jstrict_capacity_limit),
  28           static_cast<double>(jhigh_pri_pool_ratio)));
  29   return reinterpret_cast<jlong>(sptr_lru_cache);
  30 }
  31
  32 /*
  33  * Class:     org_rocksdb_LRUCache
  34  * Method:    disposeInternal
  35  * Signature: (J)V
  36  */
  37 void Java_org_rocksdb_LRUCache_disposeInternal(JNIEnv* /*env*/,
  38                                                jobject /*jobj*/,
  39                                                jlong jhandle) {
  40   auto* sptr_lru_cache =
  41       reinterpret_cast<std::shared_ptr<ROCKSDB_NAMESPACE::Cache>*>(jhandle);
  42   delete sptr_lru_cache;  // delete std::shared_ptr
  43 }