org.apache.flink.runtime.state.subkeyed.SubKeyedSortedMapState Maven / Gradle / Ivy
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* 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.flink.runtime.state.subkeyed;
import java.util.Iterator;
import java.util.Map;
import java.util.SortedMap;
/**
* /**
* The interface for {@link SubKeyedState}s whose values are a collection of
* key-value pairs. But different from {@link SubKeyedMapState}, when iterating
* over the key-value pairs under a given key, the order in which the key-value
* pairs are iterated is specified via the comparator in the state's descriptor.
*
* @param The type of the keys in the state.
* @param The type of the namespaces in the state.
* @param The type of the keys in the mappings.
* @param The type of the values in the mappings.
*/
public interface SubKeyedSortedMapState extends AbstractSubKeyedMapState> {
/**
* Returns the entry with the smallest map key under the given key and namespace.
*
* @param key The key under which the retrieved entry locates.
* @param namespace The namespace under which the retrieved entry locates.
* @return The entry with the smallest map key under the given key.
*/
Map.Entry firstEntry(K key, N namespace);
/**
* Returns the entry with the largest map key under the given key and namespace.
*
* @param key The key under which the retrieved entry locates.
* @param namespace The namespace under which the retrieved entry locates.
* @return The entry with the largest map key under the given key.
*/
Map.Entry lastEntry(K key, N namespace);
/**
* Returns an iterator over all the mappings under the given key and
* namespace whose mapping keys are strictly less than {@code endMapKey}.
* The iterator is backed by the state, so changes to the iterator are
* reflected in the state, and vice-versa.
*
* @param key The key under which the mappings are to be iterated.
* @param namespace The namespace of the mappings to be iterated.
* @param endMapKey The high endpoint (exclusive) of the map keys in the
* mappings to be iterated.
* @return An iterator over all the mappings under the given key and
* namespace whose mapping keys are equal to or greater than
* {@code endMapKey}.
*/
Iterator> headIterator(K key, N namespace, MK endMapKey);
/**
* Returns an iterator over all the mappings under the given key and
* namespace whose mapping keys are equal to or greater than
* {@code startMapKey}. The iterator is backed by the state, so changes to
* the iterator are reflected in the state, and vice-versa.
*
* @param key The key under which the mappings are to be iterated.
* @param namespace The namespace of the mappings to be iterated.
* @param startMapKey The low endpoint (inclusive) of the map keys in the
* mappings to be iterated.
* @return An iterator over all the mappings under the given key and
* namespace whose mapping keys are equal to or greater than
* {@code startMapKey}.
*/
Iterator> tailIterator(K key, N namespace, MK startMapKey);
/**
* Returns an iterator over all the mappings under the given key and
* namespace whose mapping keys locate in the given range. The iterator is
* backed by the state, so changes to the iterator are reflected in the
* state, and vice-versa.
*
* @param key The key under which the mappings are to be iterated.
* @param namespace The namespace of the mappings to be iterated.
* @param startMapKey The low endpoint (inclusive) of the map keys in the
* mappings to be iterated.
* @param endMapKey The high endpoint (exclusive) of the map keys in the
* mappings to be iterated.
* @return An iterator over all the mappings under the given key and
* namespace whose mapping keys locate in the given range.
*/
Iterator> subIterator(K key, N namespace, MK startMapKey, MK endMapKey);
}