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.alibaba.metrics.os.windows;
  
  import com.alibaba.metrics.CachedMetricSet;
  import com.alibaba.metrics.Clock;
  import com.alibaba.metrics.Gauge;
  import com.alibaba.metrics.Metric;
  import com.alibaba.metrics.MetricName;
  import com.alibaba.metrics.PersistentGauge;
  import com.alibaba.metrics.RatioGauge;
  import com.sun.management.OperatingSystemMXBean;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.lang.management.ManagementFactory;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  
  //import org.hyperic.sigar.CpuInfo;
  //import org.hyperic.sigar.CpuPerc;
  //import org.hyperic.sigar.Sigar;
  //import org.hyperic.sigar.SigarException;
  
  public class SystemMemoryGaugeSet extends CachedMetricSet{
  
      private static final Logger logger = LoggerFactory.getLogger(SystemMemoryGaugeSet.class);
  
      private static OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
  
      private Map<MetricName, Metric> gauges;
  
      private static final String[] METRICS = {
              "mem.total",      // MemTotal
              "mem.used",       // MemTotal - (MemFree + Buffers + Cached)
              "mem.free",       // MemFree
              "mem.buffers",    // Buffers
              "mem.cached",     // Cached
              "mem.swap.total", // SwapTotal
              "mem.swap.used",  // SwapTotal - SwapFree
              "mem.swap.free",  // SwapFree
      };
  
      private long[] data;
  
      public SystemMemoryGaugeSet(long dataTTL, TimeUnit unit, Clock clock){
          super(dataTTL, unit, clock);
          this.data = new long[METRICS.length];
          this.gauges = new HashMap<MetricName, Metric>();
          populateGauges();
      }
  
      public SystemMemoryGaugeSet(long dataTTL, TimeUnit unit) {
          this(dataTTL, unit, Clock.defaultClock());
      }
  
      @Override
      public Map<MetricName, Metric> getMetrics() {
          return gauges;
      }
  
      @Override
      protected void getValueInternal() {
          data[0] = osmxb.getTotalPhysicalMemorySize() / 1024;
          data[2] = osmxb.getFreePhysicalMemorySize() / 1024;
          data[3] = 0;
          data[4] = 0;
          data[5] = osmxb.getTotalSwapSpaceSize() / 1024;
          data[6] = 0;
          data[7] = osmxb.getFreeSwapSpaceSize() / 1024;
          data[1] = data[0] - data[2];
      }
  
      private void populateGauges() {
          for (int i = 0; i < METRICS.length; i++) {
              gauges.put(MetricName.build(METRICS[i]), new MemGauge(i));
          }
  
          final RatioGauge usedRatio = new RatioGauge() {
              @Override
              @SuppressWarnings("unchecked")
              protected Ratio getRatio() {
                  Gauge<Long> memUsed = (Gauge<Long>)gauges.get(MetricName.build("mem.used"));
                  Gauge<Long> memTotal = (Gauge<Long>)gauges.get(MetricName.build("mem.total"));
                  return Ratio.of(memUsed.getValue().doubleValue(), memTotal.getValue().doubleValue());
              }
          };
  
          gauges.put(MetricName.build("mem.used_ratio"), usedRatio);
      }
  
      private class MemGauge extends PersistentGauge<Long> {
  
          private int index;
  
          public MemGauge(int index) {
              this.index = index;
          }
  
          @Override
          public Long getValue() {
              try {
                  refreshIfNecessary();
                  return data[index];
              } catch (Exception e) {
                  return 0L;
              }
          }
      }
  
  }
  