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.metrics;
  
  import java.util.Arrays;
  import org.apache.beam.sdk.annotations.Internal;
  
  /**
   * <b>Internal:</b> For internal use only and not for public consumption. This API is subject to
   * incompatible changes, or even removal, in a future release.
   *
   * <p>A metric that represents a bounded trie data structure. This interface extends the {@link
   * Metric} interface and provides methods for adding string sequences (paths) to the trie.
   *
   * <p>The trie is bounded in size (max=100), meaning it has a maximum capacity for storing paths.
   * When the trie reaches its capacity, it truncates paths. This is useful for tracking and
   * aggregating a large number of distinct paths while limiting memory usage. It is not necessary but
   * recommended that parts of paths provided as strings are hierarchical in nature so the truncation
   * reduces granularity rather than complete data loss.
   */
  @Internal
  public interface BoundedTrie extends Metric {
  
    /**
     * Adds a path to the trie. The path is represented as an iterable of string segments.
     *
     * @param values The segments of the path to add.
     */
    void add(Iterable<String> values);
  
    /**
     * Adds a path to the trie. The path is represented as a variable number of string arguments.
     *
     * @param values The segments of the path to add.
     */
    default void add(String... values) {
      add(Arrays.asList(values));
    }
  }
  