c5302a8a58
Summary: This is an abstraction for working with custom Comparators implemented in native C++ code from Java. Native code must directly extend `rocksdb::Comparator`. When the native code comparator is compiled into the RocksDB codebase, you can then create a Java Class, and JNI stub to wrap it. Useful if the C++/JNI barrier overhead is too much for your applications comparator performance. An example is provided in `java/rocksjni/native_comparator_wrapper_test.cc` and `java/src/main/java/org/rocksdb/NativeComparatorWrapperTest.java`. Closes https://github.com/facebook/rocksdb/pull/3334 Differential Revision: D7172605 Pulled By: miasantreble fbshipit-source-id: e24b7eb267a3bcb6afa214e0379a1d5e8a2ceabe
66 lines
1.9 KiB
C++
66 lines
1.9 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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//
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// This file implements the "bridge" between Java and C++ for
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// rocksdb::Comparator.
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#include <stdio.h>
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#include <stdlib.h>
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#include <jni.h>
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#include <string>
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#include <functional>
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#include "include/org_rocksdb_Comparator.h"
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#include "include/org_rocksdb_DirectComparator.h"
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#include "include/org_rocksdb_NativeComparatorWrapper.h"
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#include "rocksjni/comparatorjnicallback.h"
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#include "rocksjni/portal.h"
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// <editor-fold desc="org.rocksdb.Comparator>
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/*
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* Class: org_rocksdb_Comparator
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* Method: createNewComparator0
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* Signature: ()J
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*/
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jlong Java_org_rocksdb_Comparator_createNewComparator0(
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JNIEnv* env, jobject jobj, jlong copt_handle) {
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auto* copt =
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reinterpret_cast<rocksdb::ComparatorJniCallbackOptions*>(copt_handle);
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auto* c =
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new rocksdb::ComparatorJniCallback(env, jobj, copt);
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return reinterpret_cast<jlong>(c);
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}
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// </editor-fold>
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// <editor-fold desc="org.rocksdb.DirectComparator>
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/*
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* Class: org_rocksdb_DirectComparator
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* Method: createNewDirectComparator0
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* Signature: ()J
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*/
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jlong Java_org_rocksdb_DirectComparator_createNewDirectComparator0(
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JNIEnv* env, jobject jobj, jlong copt_handle) {
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auto* copt =
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reinterpret_cast<rocksdb::ComparatorJniCallbackOptions*>(copt_handle);
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auto* c =
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new rocksdb::DirectComparatorJniCallback(env, jobj, copt);
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return reinterpret_cast<jlong>(c);
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}
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/*
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* Class: org_rocksdb_NativeComparatorWrapper
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* Method: disposeInternal
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* Signature: (J)V
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*/
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void Java_org_rocksdb_NativeComparatorWrapper_disposeInternal(
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JNIEnv* env, jobject jobj, jlong jcomparator_handle) {
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auto* comparator =
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reinterpret_cast<rocksdb::Comparator*>(jcomparator_handle);
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delete comparator;
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}
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// </editor-fold>
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