State.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,
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 * See the License for the specific language governing permissions and
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 */
package org.apache.beam.sdk.state;

import org.apache.beam.sdk.annotations.Experimental;
import org.apache.beam.sdk.annotations.Experimental.Kind;

/**
 * A state cell, supporting a {@link #clear()} operation.
 *
 * <p>Specific types of state add appropriate accessors for reading and writing values, see {@link
 * ValueState}, {@link BagState}, and {@link GroupingState}.
 */
@Experimental(Kind.STATE)
public interface State {

  /**
   * Clear out the state location.
   */
  void clear();
}