53 lines
1.7 KiB
C
53 lines
1.7 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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//
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// This file implements the callback "bridge" between Java and C++ for
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// rocksdb::Comparator and rocksdb::DirectComparator.
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#ifndef JAVA_ROCKSJNI_COMPARATORJNICALLBACK_H_
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#define JAVA_ROCKSJNI_COMPARATORJNICALLBACK_H_
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#include <jni.h>
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#include "rocksdb/comparator.h"
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#include "rocksdb/slice.h"
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namespace rocksdb {
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class BaseComparatorJniCallback : public Comparator {
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public:
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BaseComparatorJniCallback(JNIEnv* env, jobject jComparator);
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virtual ~BaseComparatorJniCallback();
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virtual const char* Name() const;
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virtual int Compare(const Slice& a, const Slice& b) const;
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virtual void FindShortestSeparator(std::string* start, const Slice& limit) const;
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virtual void FindShortSuccessor(std::string* key) const;
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private:
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JavaVM* m_jvm;
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jobject m_jComparator;
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std::string m_name;
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jmethodID m_jCompareMethodId;
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jmethodID m_jFindShortestSeparatorMethodId;
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jmethodID m_jFindShortSuccessorMethodId;
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JNIEnv* getJniEnv() const;
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protected:
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jobject m_jSliceA;
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jobject m_jSliceB;
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jobject m_jSliceLimit;
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};
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class ComparatorJniCallback : public BaseComparatorJniCallback {
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public:
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ComparatorJniCallback(JNIEnv* env, jobject jComparator);
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};
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class DirectComparatorJniCallback : public BaseComparatorJniCallback {
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public:
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DirectComparatorJniCallback(JNIEnv* env, jobject jComparator);
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};
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} // namespace rocksdb
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#endif // JAVA_ROCKSJNI_COMPARATORJNICALLBACK_H_
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