kafka FixedOrderMap 源码
kafka FixedOrderMap 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/utils/FixedOrderMap.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.common.utils;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* An ordered map (LinkedHashMap) implementation for which the order is immutable.
* To accomplish this, all methods of removing mappings are disabled (they are marked
* deprecated and throw an exception).
*
* This class is final to prevent subclasses from violating the desired property.
*
* @param <K> The key type
* @param <V> The value type
*/
public final class FixedOrderMap<K, V> extends LinkedHashMap<K, V> {
private static final long serialVersionUID = -6504110858733236170L;
@Deprecated
@Override
protected boolean removeEldestEntry(final Map.Entry<K, V> eldest) {
return false;
}
@Deprecated
@Override
public V remove(final Object key) {
throw new UnsupportedOperationException("Removing from registeredStores is not allowed");
}
@Deprecated
@Override
public boolean remove(final Object key, final Object value) {
throw new UnsupportedOperationException("Removing from registeredStores is not allowed");
}
@Override
public FixedOrderMap<K, V> clone() {
throw new UnsupportedOperationException();
}
}
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