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.metrics;
  
  import org.apache.kafka.common.utils.Time;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  public class RocksDBMetricsRecordingTrigger implements Runnable {
  
      private final Map<String, RocksDBMetricsRecorder> metricsRecordersToTrigger = new ConcurrentHashMap<>();
      private final Time time;
  
      public RocksDBMetricsRecordingTrigger(final Time time) {
          this.time = time;
      }
  
      public void addMetricsRecorder(final RocksDBMetricsRecorder metricsRecorder) {
          final String metricsRecorderName = metricsRecorderName(metricsRecorder);
          if (metricsRecordersToTrigger.containsKey(metricsRecorderName)) {
              throw new IllegalStateException("RocksDB metrics recorder for store \"" + metricsRecorder.storeName() +
                  "\" of task " + metricsRecorder.taskId().toString() + " has already been added. "
                  + "This is a bug in Kafka Streams.");
          }
          metricsRecordersToTrigger.put(metricsRecorderName, metricsRecorder);
      }
  
      public void removeMetricsRecorder(final RocksDBMetricsRecorder metricsRecorder) {
          final RocksDBMetricsRecorder removedMetricsRecorder =
              metricsRecordersToTrigger.remove(metricsRecorderName(metricsRecorder));
          if (removedMetricsRecorder == null) {
              throw new IllegalStateException("No RocksDB metrics recorder for store "
                  + "\"" + metricsRecorder.storeName() + "\" of task " + metricsRecorder.taskId() + " could be found. "
                  + "This is a bug in Kafka Streams.");
          }
      }
  
      private String metricsRecorderName(final RocksDBMetricsRecorder metricsRecorder) {
          return metricsRecorder.taskId().toString() + "-" + metricsRecorder.storeName();
      }
  
      @Override
      public void run() {
          final long now = time.milliseconds();
          for (final RocksDBMetricsRecorder metricsRecorder : metricsRecordersToTrigger.values()) {
              metricsRecorder.record(now);
          }
      }
  }
  