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.atlas.util;
  
  import java.lang.management.ManagementFactory;
  import java.lang.management.MemoryMXBean;
  import java.lang.management.MemoryPoolMXBean;
  import java.lang.management.MemoryType;
  import java.lang.management.MemoryUsage;
  import java.lang.management.OperatingSystemMXBean;
  import java.lang.management.RuntimeMXBean;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  public class AtlasMetricJVMUtil {
      private static final RuntimeMXBean         RUNTIME;
      private static final OperatingSystemMXBean OS;
      private static final MemoryMXBean          memBean;
  
      private AtlasMetricJVMUtil() {
          // to block instantiation
      }
  
      /**
       * Collect general runtime information.
       */
      public static Map<String, Object> getRuntimeInfo() {
          Map<String, Object> vmDetails = new LinkedHashMap<>();
  
          vmDetails.put("name", RUNTIME.getVmName());
          vmDetails.put("version", RUNTIME.getSystemProperties().get("java.version"));
  
          return vmDetails;
      }
  
      /**
       * Add memory details
       */
      public static Map<String, Object> getMemoryDetails() {
          Map<String, Object> memory = new LinkedHashMap<>();
  
          heapDetails(memory);
          pooldivision(memory);
  
          return memory;
      }
  
      /**
       * Collect system information.
       */
      public static Map<String, Object> getSystemInfo() {
          Map<String, Object> values = new LinkedHashMap<>();
          String[]            osInfo = {OS.getName(), OS.getArch(), OS.getVersion()};
  
          values.put("os.spec", String.join(", ", osInfo));
          values.put("os.vcpus", String.valueOf(OS.getAvailableProcessors()));
  
          return values;
      }
  
      /**
       * collect the pool division of java
       */
      private static void pooldivision(Map<String, Object> memory) {
          Map<String, Object> poolDivisionValues = new LinkedHashMap<>();
  
          for (MemoryPoolMXBean mpBean : ManagementFactory.getMemoryPoolMXBeans()) {
              if (mpBean.getType() == MemoryType.HEAP) {
                  poolDivisionValues.put(mpBean.getName(), mpBean.getUsage());
              }
          }
  
          memory.put("memory_pool_usages", poolDivisionValues);
      }
  
      /**
       * Collect java heap details
       */
      private static void heapDetails(Map<String, Object> memory) {
          MemoryUsage memHeapUsage = memBean.getHeapMemoryUsage();
          MemoryUsage nonHeapUsage = memBean.getNonHeapMemoryUsage();
  
          memory.put("heapInit", String.valueOf(memHeapUsage.getInit()));
          memory.put("heapMax", String.valueOf(memHeapUsage.getMax()));
          memory.put("heapCommitted", String.valueOf(memHeapUsage.getCommitted()));
          memory.put("heapUsed", String.valueOf(memHeapUsage.getUsed()));
          memory.put("nonHeapInit", String.valueOf(nonHeapUsage.getInit()));
          memory.put("nonHeapMax", String.valueOf(nonHeapUsage.getMax()));
          memory.put("nonHeapCommitted", String.valueOf(nonHeapUsage.getCommitted()));
          memory.put("nonHeapUsed", String.valueOf(nonHeapUsage.getUsed()));
      }
  
      static {
          RUNTIME = ManagementFactory.getRuntimeMXBean();
          OS      = ManagementFactory.getOperatingSystemMXBean();
          memBean = ManagementFactory.getMemoryMXBean();
      }
  }
  