kafka RocksDbSessionBytesStoreSupplier 源码

2022-10-20
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kafka RocksDbSessionBytesStoreSupplier 代码

文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/RocksDbSessionBytesStoreSupplier.java

/*
 * 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.utils.Bytes;
import org.apache.kafka.streams.state.SessionBytesStoreSupplier;
import org.apache.kafka.streams.state.SessionStore;

public class RocksDbSessionBytesStoreSupplier implements SessionBytesStoreSupplier {
    private final String name;
    private final long retentionPeriod;

    public RocksDbSessionBytesStoreSupplier(final String name,
                                            final long retentionPeriod) {
        this.name = name;
        this.retentionPeriod = retentionPeriod;
    }

    @Override
    public String name() {
        return name;
    }

    @Override
    public SessionStore<Bytes, byte[]> get() {
        final RocksDBSegmentedBytesStore segmented = new RocksDBSegmentedBytesStore(
            name,
            metricsScope(),
            retentionPeriod,
            segmentIntervalMs(),
            new SessionKeySchema());
        return new RocksDBSessionStore(segmented);
    }

    @Override
    public String metricsScope() {
        return "rocksdb-session";
    }

    @Override
    public long segmentIntervalMs() {
        // Selected somewhat arbitrarily. Profiling may reveal a different value is preferable.
        return Math.max(retentionPeriod / 2, 60_000L);
    }

    @Override
    public long retentionPeriod() {
        return retentionPeriod;
    }
}

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