content: /*
   *
   *  * Copyright 2020 Alibaba Group Holding Limited.
   *  *
   *  * Licensed 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 com.alibaba.graphscope.common.metric;
  
  import com.google.common.collect.ImmutableMap;
  
  import java.lang.management.BufferPoolMXBean;
  import java.lang.management.ManagementFactory;
  import java.util.List;
  import java.util.Map;
  
  public class MemoryMetric implements Metric<Map> {
      @Override
      public Key getKey() {
          return KeyFactory.MEMORY;
      }
  
      @Override
      public Map getValue() {
          // jvm memory status
          long jvmFreeMem = Runtime.getRuntime().freeMemory();
          long jvmTotalMem = Runtime.getRuntime().totalMemory();
          long jvmUsedMem = jvmTotalMem - jvmFreeMem;
  
          // Direct memory
          List<BufferPoolMXBean> bufferPools =
                  ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
          long directUsedMem = ValueFactory.INVALID_LONG;
          long directTotalMem = ValueFactory.INVALID_LONG;
          for (BufferPoolMXBean bufferPool : bufferPools) {
              if ("direct".equalsIgnoreCase(bufferPool.getName())) {
                  directUsedMem = bufferPool.getMemoryUsed();
                  directTotalMem = bufferPool.getTotalCapacity();
              }
          }
          return ImmutableMap.of(
                  "jvm.used",
                  jvmUsedMem,
                  "jvm.total",
                  jvmTotalMem,
                  "direct.used",
                  directUsedMem,
                  "direct.total",
                  directTotalMem);
      }
  }
  