kafka SessionBytesStoreSupplier 源码
kafka SessionBytesStoreSupplier 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/SessionBytesStoreSupplier.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;
import org.apache.kafka.common.utils.Bytes;
/**
* A store supplier that can be used to create one or more {@link SessionStore SessionStore<Byte, byte[]>} instances.
*
* For any stores implementing the {@link SessionStore SessionStore<Byte, byte[]>} interface, {@code null} value
* bytes are considered as "not exist". This means:
* <ol>
* <li>{@code null} value bytes in put operations should be treated as delete.</li>
* <li>{@code null} value bytes should never be returned in range query results.</li>
* </ol>
*/
public interface SessionBytesStoreSupplier extends StoreSupplier<SessionStore<Bytes, byte[]>> {
/**
* The size of a segment, in milliseconds. Used when caching is enabled to segment the cache
* and reduce the amount of data that needs to be scanned when performing range queries.
*
* @return segmentInterval in milliseconds
*/
long segmentIntervalMs();
/**
* The time period for which the {@link SessionStore} will retain historic data.
*
* @return retentionPeriod
*/
long retentionPeriod();
}
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