/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.kafka.streams.state.internals;

import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.streams.state.KeyValueStore;

import java.util.Map;

/**
 * A {@link org.apache.kafka.streams.state.KeyValueStore} that stores all entries in a local RocksDB database.
 *
 * @param <K> the type of keys
 * @param <V> the type of values
 * @see org.apache.kafka.streams.state.Stores#create(String)
 */

public class RocksDBKeyValueStoreSupplier<K, V> extends AbstractStoreSupplier<K, V, KeyValueStore> {

    private static final String METRICS_SCOPE = "rocksdb-state";
    private final boolean cached;

    public RocksDBKeyValueStoreSupplier(String name, Serde<K> keySerde, Serde<V> valueSerde, boolean logged, Map<String, String> logConfig, boolean cached) {
        this(name, keySerde, valueSerde, null, logged, logConfig, cached);
    }

    public RocksDBKeyValueStoreSupplier(String name, Serde<K> keySerde, Serde<V> valueSerde, Time time, boolean logged, Map<String, String> logConfig, boolean cached) {
        super(name, keySerde, valueSerde, time, logged, logConfig);
        this.cached = cached;
    }

    public KeyValueStore get() {
        if (!cached && !logged) {
            return new MeteredKeyValueStore<>(
                    new RocksDBStore<>(name, keySerde, valueSerde), METRICS_SCOPE, time);
        }

        // when cached, logged, or both we use a bytes store as the inner most store
        final RocksDBStore<Bytes, byte[]> rocks = new RocksDBStore<>(name,
                                                                     Serdes.Bytes(),
                                                                     Serdes.ByteArray());

        if (cached && logged) {
            return new CachingKeyValueStore<>(
                    new MeteredKeyValueStore<>(
                            new ChangeLoggingKeyValueBytesStore(rocks),
                            METRICS_SCOPE,
                            time),
                    keySerde,
                    valueSerde);
        }

        if (cached) {
            return new CachingKeyValueStore<>(
                    new MeteredKeyValueStore<>(rocks, METRICS_SCOPE, time),
                    keySerde,
                    valueSerde);

        } else {
            // logged
            return new MeteredKeyValueStore<>(
                    new ChangeLoggingKeyValueStore<>(rocks, keySerde, valueSerde),
                    METRICS_SCOPE,
                    time);
        }

    }


}