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.kafka.streams.state.internals;
  
  import org.apache.kafka.streams.processor.StateStore;
  import org.apache.kafka.streams.processor.api.Record;
  import org.apache.kafka.streams.processor.internals.ProcessorRecordContext;
  import org.apache.kafka.streams.processor.internals.SerdeGetter;
  import org.apache.kafka.streams.state.ValueAndTimestamp;
  
  import java.util.Objects;
  import java.util.function.Consumer;
  import java.util.function.Supplier;
  
  /** An interface for a time ordered buffer.
   *
   * @param <K> Key type
   * @param <V> Value type
   * @param <T> Store type
   */
  public interface TimeOrderedKeyValueBuffer<K, V, T> extends StateStore {
  
      final class Eviction<K, T> {
          private final K key;
          private final T value;
          private final ProcessorRecordContext recordContext;
  
          Eviction(final K key, final T value, final ProcessorRecordContext recordContext) {
              this.key = key;
              this.value = value;
              this.recordContext = recordContext;
          }
  
          public K key() {
              return key;
          }
  
          public T value() {
              return value;
          }
  
          public Record<K, T> record() {
              return new Record<>(key, value, recordContext.timestamp());
          }
  
          public ProcessorRecordContext recordContext() {
              return recordContext;
          }
  
          @Override
          public String toString() {
              return "Eviction{key=" + key + ", value=" + value + ", recordContext=" + recordContext + '}';
          }
  
          @Override
          public boolean equals(final Object o) {
              if (this == o) return true;
              if (o == null || getClass() != o.getClass()) return false;
              final Eviction<?, ?> eviction = (Eviction<?, ?>) o;
              return Objects.equals(key, eviction.key) &&
                  Objects.equals(value, eviction.value) &&
                  Objects.equals(recordContext, eviction.recordContext);
          }
  
          @Override
          public int hashCode() {
              return Objects.hash(key, value, recordContext);
          }
  
      }
  
      void setSerdesIfNull(final SerdeGetter getter);
  
      void evictWhile(final Supplier<Boolean> predicate, final Consumer<Eviction<K, T>> callback);
  
      Maybe<ValueAndTimestamp<V>> priorValueForBuffered(K key);
  
      boolean put(long time, Record<K, T> record, ProcessorRecordContext recordContext);
  
      int numRecords();
  
      long bufferSize();
  
      long minTimestamp();
  }
  