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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;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.configuration.IllegalConfigurationException;

/**
 * An interface for state backends that pick up additional parameters from a configuration.
 */
public interface ConfigurableStateBackend {

	/**
	 * Creates a variant of the state backend that applies additional configuration parameters.
	 *
	 * 

Settings that were directly done on the original state backend object in the application * program typically have precedence over setting picked up from the configuration. * *

If no configuration is applied, or if the method directly applies configuration values to * the (mutable) state backend object, this method may return the original state backend object. * Otherwise it typically returns a modified copy. * * @param config The configuration to pick the values from. * @return A reconfigured state backend. * * @throws IllegalConfigurationException Thrown if the configuration contained invalid entries. */ StateBackend configure(Configuration config) throws IllegalConfigurationException; }





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