spark KVStoreIterator 源码
spark KVStoreIterator 代码
文件路径：/common/kvstore/src/main/java/org/apache/spark/util/kvstore/KVStoreIterator.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.spark.util.kvstore;
import java.io.Closeable;
import java.util.Iterator;
import java.util.List;
import org.apache.spark.annotation.Private;
/**
* An iterator for KVStore.
*
* <p>
* Iterators may keep references to resources that need to be closed. It's recommended that users
* explicitly close iterators after they're used.
* </p>
*/
@Private
public interface KVStoreIterator<T> extends Iterator<T>, Closeable {
/**
* Retrieve multiple elements from the store.
*
* @param max Maximum number of elements to retrieve.
*/
List<T> next(int max);
/**
* Skip in the iterator.
*
* @return Whether there are items left after skipping.
*/
boolean skip(long n);
}
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