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.common.serialization.StringSerializer;
  import org.apache.kafka.streams.KeyValue;
  import org.apache.kafka.streams.state.KeyValueIterator;
  import org.apache.kafka.streams.state.TimestampedKeyValueStore;
  import org.apache.kafka.streams.state.ValueAndTimestamp;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.Mock;
  import org.mockito.junit.jupiter.MockitoExtension;
  import org.mockito.junit.jupiter.MockitoSettings;
  import org.mockito.quality.Strictness;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.is;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.mockito.Mockito.when;
  
  @ExtendWith(MockitoExtension.class)
  @MockitoSettings(strictness = Strictness.STRICT_STUBS)
  public class ReadOnlyKeyValueStoreFacadeTest {
      @Mock
      private TimestampedKeyValueStore<String, String> mockedKeyValueTimestampStore;
      @Mock
      private KeyValueIterator<String, ValueAndTimestamp<String>> mockedKeyValueTimestampIterator;
  
      private ReadOnlyKeyValueStoreFacade<String, String> readOnlyKeyValueStoreFacade;
  
      @BeforeEach
      public void setup() {
          readOnlyKeyValueStoreFacade = new ReadOnlyKeyValueStoreFacade<>(mockedKeyValueTimestampStore);
      }
  
      @Test
      public void shouldReturnPlainValueOnGet() {
          when(mockedKeyValueTimestampStore.get("key"))
              .thenReturn(ValueAndTimestamp.make("value", 42L));
          when(mockedKeyValueTimestampStore.get("unknownKey"))
              .thenReturn(null);
  
          assertThat(readOnlyKeyValueStoreFacade.get("key"), is("value"));
          assertNull(readOnlyKeyValueStoreFacade.get("unknownKey"));
      }
  
      @Test
      public void shouldReturnPlainKeyValuePairsForRangeIterator() {
          when(mockedKeyValueTimestampIterator.next())
              .thenReturn(KeyValue.pair("key1", ValueAndTimestamp.make("value1", 21L)))
              .thenReturn(KeyValue.pair("key2", ValueAndTimestamp.make("value2", 42L)));
          when(mockedKeyValueTimestampStore.range("key1", "key2")).thenReturn(mockedKeyValueTimestampIterator);
  
          final KeyValueIterator<String, String> iterator = readOnlyKeyValueStoreFacade.range("key1", "key2");
          assertThat(iterator.next(), is(KeyValue.pair("key1", "value1")));
          assertThat(iterator.next(), is(KeyValue.pair("key2", "value2")));
      }
  
      @Test
      public void shouldReturnPlainKeyValuePairsForPrefixScan() {
          final StringSerializer stringSerializer = new StringSerializer();
          when(mockedKeyValueTimestampIterator.next())
              .thenReturn(KeyValue.pair("key1", ValueAndTimestamp.make("value1", 21L)))
              .thenReturn(KeyValue.pair("key2", ValueAndTimestamp.make("value2", 42L)));
          when(mockedKeyValueTimestampStore.prefixScan("key", stringSerializer)).thenReturn(mockedKeyValueTimestampIterator);
  
          final KeyValueIterator<String, String> iterator = readOnlyKeyValueStoreFacade.prefixScan("key", stringSerializer);
          assertThat(iterator.next(), is(KeyValue.pair("key1", "value1")));
          assertThat(iterator.next(), is(KeyValue.pair("key2", "value2")));
      }
  
      @Test
      public void shouldReturnPlainKeyValuePairsForAllIterator() {
          when(mockedKeyValueTimestampIterator.next())
              .thenReturn(KeyValue.pair("key1", ValueAndTimestamp.make("value1", 21L)))
              .thenReturn(KeyValue.pair("key2", ValueAndTimestamp.make("value2", 42L)));
          when(mockedKeyValueTimestampStore.all()).thenReturn(mockedKeyValueTimestampIterator);
  
          final KeyValueIterator<String, String> iterator = readOnlyKeyValueStoreFacade.all();
          assertThat(iterator.next(), is(KeyValue.pair("key1", "value1")));
          assertThat(iterator.next(), is(KeyValue.pair("key2", "value2")));
      }
  
      @Test
      public void shouldForwardApproximateNumEntries() {
          when(mockedKeyValueTimestampStore.approximateNumEntries()).thenReturn(42L);
  
          assertThat(readOnlyKeyValueStoreFacade.approximateNumEntries(), is(42L));
      }
  }
  