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Nitrite storage adapter for RocksDB
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/*
 * Copyright (c) 2019-2020. Nitrite author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.dizitart.no2.rocksdb;

import lombok.Getter;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.dizitart.no2.exceptions.NitriteIOException;
import org.rocksdb.*;
import org.rocksdb.util.BytewiseComparator;

import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @since 4.0
 * @author Anindya Chatterjee
 */
@Slf4j(topic = "nitrite-rocksdb")
@Getter
@Setter
public class RocksDBReference implements AutoCloseable {
    private Options options;
    private DBOptions dbOptions;
    private ColumnFamilyOptions columnFamilyOptions;
    private RocksDB rocksDB;
    private BytewiseComparator dbComparator;

    private List columnFamilyDescriptors;
    private Map columnFamilyHandleRegistry;

    public RocksDBReference() {
        this.columnFamilyDescriptors = new ArrayList<>();
        this.columnFamilyHandleRegistry = new ConcurrentHashMap<>();
        this.dbComparator = null;
    }

    @Override
    public void close() throws RocksDBException {
        // if nitrite maps are already closed, this will affect nothing
        columnFamilyHandleRegistry.values().forEach(AbstractImmutableNativeReference::close);
        columnFamilyHandleRegistry.clear();

        rocksDB.closeE();
        dbOptions.close();
        dbComparator.close();
        columnFamilyOptions.close();
        options.close();
    }

    public synchronized ColumnFamilyHandle getOrCreateColumnFamily(String name) {
        if (columnFamilyHandleRegistry.containsKey(name)) {
            return columnFamilyHandleRegistry.get(name);
        } else {
            try {
                ColumnFamilyHandle handle = rocksDB.createColumnFamily(
                    new ColumnFamilyDescriptor(name.getBytes(StandardCharsets.UTF_8), columnFamilyOptions));
                columnFamilyHandleRegistry.put(name, handle);
                return handle;
            } catch (RocksDBException e) {
                log.error("Error while retrieving column family handle", e);
                throw new NitriteIOException("Failed to obtain column family handle", e);
            }
        }
    }

    public void dropColumnFamily(String mapName) {
        if (columnFamilyHandleRegistry.containsKey(mapName)) {
            try {
                ColumnFamilyHandle handle = columnFamilyHandleRegistry.get(mapName);
                rocksDB.dropColumnFamily(handle);
                handle.close();
                columnFamilyHandleRegistry.remove(mapName);
            } catch (RocksDBException e) {
                log.error("Error while dropping column family " + mapName, e);
                throw new NitriteIOException("Failed to drop column family", e);
            }
        }
    }

    public BytewiseComparator getDbComparator() {
        // delayed initialization, otherwise initializing
        // it in ctor is throwing java.lang.UnsatisfiedLinkError
        if (dbComparator == null) {
            dbComparator = new BytewiseComparator(new ComparatorOptions());
        }
        return dbComparator;
    }
}