content: /*
   * 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.beam.sdk.util;
  
  import org.apache.beam.sdk.annotations.Internal;
  
  /**
   * An object for detecting illegal mutations.
   *
   * <p>The {@link AutoCloseable} aspect of this interface allows use in a try-with-resources style,
   * where the implementing class may choose to perform a final mutation check upon {@link #close()}.
   */
  @Internal
  public interface MutationDetector extends AutoCloseable {
    /** @throws IllegalMutationException if illegal mutations are detected. */
    void verifyUnmodified() throws IllegalMutationException;
  }
  