kafka KeyValueStore 源码
kafka KeyValueStore 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/KeyValueStore.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.streams.KeyValue;
import org.apache.kafka.streams.processor.StateStore;
import java.util.List;
/**
* A key-value store that supports put/get/delete and range queries.
*
* @param <K> The key type
* @param <V> The value type
*/
public interface KeyValueStore<K, V> extends StateStore, ReadOnlyKeyValueStore<K, V> {
/**
* Update the value associated with this key.
*
* @param key The key to associate the value to
* @param value The value to update, it can be {@code null};
* if the serialized bytes are also {@code null} it is interpreted as deletes
* @throws NullPointerException If {@code null} is used for key.
*/
void put(K key, V value);
/**
* Update the value associated with this key, unless a value is already associated with the key.
*
* @param key The key to associate the value to
* @param value The value to update, it can be {@code null};
* if the serialized bytes are also {@code null} it is interpreted as deletes
* @return The old value or {@code null} if there is no such key.
* @throws NullPointerException If {@code null} is used for key.
*/
V putIfAbsent(K key, V value);
/**
* Update all the given key/value pairs.
*
* @param entries A list of entries to put into the store;
* if the serialized bytes are also {@code null} it is interpreted as deletes
* @throws NullPointerException If {@code null} is used for key.
*/
void putAll(List<KeyValue<K, V>> entries);
/**
* Delete the value from the store (if there is one).
*
* @param key The key
* @return The old value or {@code null} if there is no such key.
* @throws NullPointerException If {@code null} is used for key.
*/
V delete(K key);
}
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