mirror of
https://github.com/facebook/rocksdb.git
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82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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// This file is designed for caching those frequently used IDs and provide
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// efficient portal (i.e, a set of static functions) to access java code
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// from c++.
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#ifndef JAVA_ROCKSJNI_PORTAL_H_
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#define JAVA_ROCKSJNI_PORTAL_H_
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#include <jni.h>
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#include "rocksdb/db.h"
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namespace rocksdb {
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// The portal class for org.rocksdb.RocksDB
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class RocksDBJni {
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public:
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// Get the java class id of org.rocksdb.RocksDB.
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static jclass getJClass(JNIEnv* env) {
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static jclass jclazz = env->FindClass("org/rocksdb/RocksDB");
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assert(jclazz != nullptr);
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return jclazz;
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}
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// Get the field id of the member variable of org.rocksdb.RocksDB
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// that stores the pointer to rocksdb::DB.
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static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
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getJClass(env), "nativeHandle", "J");
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assert(fid != nullptr);
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return fid;
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}
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// Get the pointer to rocksdb::DB of the specified org.rocksdb.RocksDB.
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static rocksdb::DB* getHandle(JNIEnv* env, jobject jdb) {
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return reinterpret_cast<rocksdb::DB*>(
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env->GetLongField(jdb, getHandleFieldID(env)));
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}
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// Pass the rocksdb::DB pointer to the java side.
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static void setHandle(JNIEnv* env, jobject jdb, rocksdb::DB* db) {
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env->SetLongField(
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jdb, getHandleFieldID(env),
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reinterpret_cast<jlong>(db));
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}
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};
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// The portal class for org.rocksdb.RocksDBException
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class RocksDBExceptionJni {
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public:
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// Get the jclass of org.rocksdb.RocksDBException
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static jclass getJClass(JNIEnv* env) {
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static jclass jclazz = env->FindClass("org/rocksdb/RocksDBException");
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assert(jclazz != nullptr);
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return jclazz;
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}
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// Create and throw a java exception by converting the input
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// Status to an RocksDBException.
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//
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// In case s.ok() is true, then this function will not throw any
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// exception.
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static void ThrowNew(JNIEnv* env, Status s) {
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if (s.ok()) {
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return;
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}
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jstring msg = env->NewStringUTF(s.ToString().c_str());
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// get the constructor id of org.rocksdb.RocksDBException
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static jmethodID mid = env->GetMethodID(
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getJClass(env), "<init>", "(Ljava/lang/String;)V");
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assert(mid != nullptr);
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env->Throw((jthrowable)env->NewObject(getJClass(env), mid, msg));
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}
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};
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} // namespace rocksdb
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#endif // JAVA_ROCKSJNI_PORTAL_H_
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