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.test;
  
  import org.apache.kafka.streams.KeyValueTimestamp;
  import org.apache.kafka.streams.processor.Cancellable;
  import org.apache.kafka.streams.processor.PunctuationType;
  import org.apache.kafka.streams.processor.api.FixedKeyProcessor;
  import org.apache.kafka.streams.processor.api.FixedKeyProcessorContext;
  import org.apache.kafka.streams.processor.api.FixedKeyRecord;
  import org.apache.kafka.streams.processor.api.Record;
  import org.apache.kafka.streams.state.ValueAndTimestamp;
  
  import java.time.Duration;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.is;
  
  public class MockApiFixedKeyProcessor<KIn, VIn, VOut> implements FixedKeyProcessor<KIn, VIn, VOut> {
  
      private final ArrayList<FixedKeyRecord<KIn, VIn>> processed = new ArrayList<>();
      private final Map<KIn, ValueAndTimestamp<VIn>> lastValueAndTimestampPerKey = new HashMap<>();
  
      private final ArrayList<Long> punctuatedStreamTime = new ArrayList<>();
      private final ArrayList<Long> punctuatedSystemTime = new ArrayList<>();
  
      private Cancellable scheduleCancellable;
  
      private final PunctuationType punctuationType;
      private final long scheduleInterval;
  
      private boolean commitRequested = false;
      private FixedKeyProcessorContext<KIn, VOut> context;
  
      public MockApiFixedKeyProcessor(final PunctuationType punctuationType,
                              final long scheduleInterval) {
          this.punctuationType = punctuationType;
          this.scheduleInterval = scheduleInterval;
      }
  
      public MockApiFixedKeyProcessor() {
          this(PunctuationType.STREAM_TIME, -1);
      }
  
      @Override
      public void init(final FixedKeyProcessorContext<KIn, VOut> context) {
          this.context = context;
          if (scheduleInterval > 0L) {
              scheduleCancellable = context.schedule(
                  Duration.ofMillis(scheduleInterval),
                  punctuationType,
                  (punctuationType == PunctuationType.STREAM_TIME ? punctuatedStreamTime : punctuatedSystemTime)::add
              );
          }
      }
  
      @Override
      public void process(final FixedKeyRecord<KIn, VIn> record) {
          final KIn key = record.key();
          final VIn value = record.value();
  
          if (value != null) {
              lastValueAndTimestampPerKey.put(key, ValueAndTimestamp.make(value, record.timestamp()));
          } else {
              lastValueAndTimestampPerKey.remove(key);
          }
  
          processed.add(record);
  
          if (commitRequested) {
              context.commit();
              commitRequested = false;
          }
      }
  
      public void checkAndClearProcessResult(final KeyValueTimestamp<?, ?>... expected) {
          assertThat("the number of outputs:" + processed, processed.size(), is(expected.length));
          for (int i = 0; i < expected.length; i++) {
              final FixedKeyRecord<KIn, VIn> record = processed.get(i);
              assertThat(
                  "output[" + i + "]:",
                  new KeyValueTimestamp<>(record.key(), record.value(), record.timestamp()),
                  is(expected[i])
              );
          }
  
          processed.clear();
      }
  
      public void checkAndClearProcessedRecords(final Record<?, ?>... expected) {
          assertThat("the number of outputs:" + processed, processed.size(), is(expected.length));
          for (int i = 0; i < expected.length; i++) {
              assertThat("output[" + i + "]:", processed.get(i), is(expected[i]));
          }
  
          processed.clear();
      }
  
      public void requestCommit() {
          commitRequested = true;
      }
  
      public void checkEmptyAndClearProcessResult() {
          assertThat("the number of outputs:", processed.size(), is(0));
          processed.clear();
      }
  
      public void checkAndClearPunctuateResult(final PunctuationType type, final long... expected) {
          final ArrayList<Long> punctuated = type == PunctuationType.STREAM_TIME ? punctuatedStreamTime : punctuatedSystemTime;
          assertThat("the number of outputs:", punctuated.size(), is(expected.length));
  
          for (int i = 0; i < expected.length; i++) {
              assertThat("output[" + i + "]:", punctuated.get(i), is(expected[i]));
          }
  
          processed.clear();
      }
  
      public ArrayList<KeyValueTimestamp<KIn, VIn>> processed() {
          return processed
              .stream()
              .map(r -> new KeyValueTimestamp<>(r.key(), r.value(), r.timestamp()))
              .collect(Collectors.toCollection(ArrayList::new));
      }
  
      public Map<KIn, ValueAndTimestamp<VIn>> lastValueAndTimestampPerKey() {
          return lastValueAndTimestampPerKey;
      }
  
      public List<Long> punctuatedStreamTime() {
          return punctuatedStreamTime;
      }
  
      public Cancellable scheduleCancellable() {
          return scheduleCancellable;
      }
  
      public FixedKeyProcessorContext<KIn, VOut> context() {
          return context;
      }
  
      public void context(final FixedKeyProcessorContext<KIn, VOut> context) {
          this.context = context;
      }
  }
  