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.bifromq.basekv.store;
  
  import org.apache.bifromq.basekv.localengine.rocksdb.RocksDBCPableKVEngineConfigurator;
  import org.apache.bifromq.basekv.localengine.rocksdb.RocksDBWALableKVEngineConfigurator;
  import org.apache.bifromq.basekv.store.option.KVRangeStoreOptions;
  import org.apache.bifromq.basekv.store.stats.StatsCollector;
  import org.apache.bifromq.basekv.store.util.ProcessUtil;
  import java.io.File;
  import java.time.Duration;
  import java.util.Map;
  import java.util.concurrent.Executor;
  import lombok.extern.slf4j.Slf4j;
  
  @Slf4j
  class KVRangeStoreStatsCollector extends StatsCollector {
      private final KVRangeStoreOptions opt;
  
      KVRangeStoreStatsCollector(KVRangeStoreOptions opt, Duration interval, Executor executor) {
          super(interval, executor);
          this.opt = opt;
          tick();
      }
  
      @Override
      protected void scrap(Map<String, Double> stats) {
          if (opt.getDataEngineConfigurator() instanceof RocksDBCPableKVEngineConfigurator conf) {
              try {
                  File dbRootDir = new File(conf.dbRootDir());
                  long total = dbRootDir.getTotalSpace();
                  if (total > 0) {
                      stats.put("db.usage", roundUsage(dbRootDir.getUsableSpace() / (double) total));
                  }
              } catch (Throwable e) {
                  log.error("Failed to calculate db usage", e);
              }
          }
          if (opt.getWalEngineConfigurator() instanceof RocksDBWALableKVEngineConfigurator conf) {
              try {
                  File walRootDir = new File(conf.dbRootDir());
                  long total = walRootDir.getTotalSpace();
                  if (total > 0) {
                      stats.put("wal.usage", roundUsage(walRootDir.getUsableSpace() / (double) total));
                  }
              } catch (Throwable e) {
                  log.error("Failed to calculate wal usage", e);
              }
          }
          stats.put("cpu.usage", roundUsage(ProcessUtil.cpuLoad()));
      }
  
      private double roundUsage(double usage) {
          return Math.round(usage * 100.0) / 100.0;
      }
  }
  