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 com.aliyun.odps.mapred.bridge;
  
  import java.lang.management.ManagementFactory;
  import java.lang.management.MemoryMXBean;
  
  /**
   * JVM state infos
   */
  class StateInfo {
  
    public static final MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
  
    public static long maxmem = 0;
  
    public static synchronized void updateMemStat(String msg) {
      long mem = memoryMXBean.getHeapMemoryUsage().getUsed();
      if (mem > maxmem) {
        maxmem = mem;
      }
      if (msg != null) {
        System.err.println("[JVM Heap Memory] used: " + mem + ", " + msg);
      }
    }
  
    public static synchronized void updateMemStat() {
      updateMemStat(null);
    }
  
    public static void init() {
      System.err.println("[JVM Heap Memory] maximum = " + memoryMXBean.getHeapMemoryUsage().getMax());
      updateMemStat("init stat info");
    }
  
    public static void printMaxMemo() {
      System.err.println("[JVM Heap Memory] max used = " + maxmem);
    }
  }
  