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.
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  package org.apache.beam.runners.core;
  
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  import org.apache.beam.sdk.state.State;
  import org.apache.beam.sdk.state.WatermarkHoldState;
  import org.joda.time.Instant;
  
  /** Simulates state like {@link InMemoryStateInternals} and provides some extra helper methods. */
  @SuppressWarnings({
    "rawtypes", // TODO(https://github.com/apache/beam/issues/20447)
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class TestInMemoryStateInternals<K> extends InMemoryStateInternals<K> {
    public TestInMemoryStateInternals(K key) {
      super(key);
    }
  
    public Set<StateTag> getTagsInUse(StateNamespace namespace) {
      Set<StateTag> inUse = new HashSet<>();
      for (Map.Entry<StateTag, State> entry : inMemoryState.getTagsInUse(namespace).entrySet()) {
        if (!isEmptyForTesting(entry.getValue())) {
          inUse.add(entry.getKey());
        }
      }
      return inUse;
    }
  
    public Set<StateNamespace> getNamespacesInUse() {
      return inMemoryState.getNamespacesInUse();
    }
  
    /** Return the earliest output watermark hold in state, or null if none. */
    public Instant earliestWatermarkHold() {
      Instant minimum = null;
      for (State storage : inMemoryState.values()) {
        if (storage instanceof WatermarkHoldState) {
          Instant hold = ((WatermarkHoldState) storage).read();
          if (minimum == null || (hold != null && hold.isBefore(minimum))) {
            minimum = hold;
          }
        }
      }
      return minimum;
    }
  }
  