kafka KeyValue 源码
kafka KeyValue 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/KeyValue.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;
import java.util.Objects;
/**
* A key-value pair defined for a single Kafka Streams record.
* If the record comes directly from a Kafka topic then its key/value are defined as the message key/value.
*
* @param <K> Key type
* @param <V> Value type
*/
public class KeyValue<K, V> {
/** The key of the key-value pair. */
public final K key;
/** The value of the key-value pair. */
public final V value;
/**
* Create a new key-value pair.
*
* @param key the key
* @param value the value
*/
public KeyValue(final K key, final V value) {
this.key = key;
this.value = value;
}
/**
* Create a new key-value pair.
*
* @param key the key
* @param value the value
* @param <K> the type of the key
* @param <V> the type of the value
* @return a new key-value pair
*/
public static <K, V> KeyValue<K, V> pair(final K key, final V value) {
return new KeyValue<>(key, value);
}
@Override
public String toString() {
return "KeyValue(" + key + ", " + value + ")";
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof KeyValue)) {
return false;
}
final KeyValue other = (KeyValue) obj;
return Objects.equals(key, other.key) && Objects.equals(value, other.value);
}
@Override
public int hashCode() {
return Objects.hash(key, value);
}
}
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