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/*
 * 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.gemstone.gemfire.management;

import java.beans.ConstructorProperties;

/**
 * Composite data type used to distribute metrics for the operating system hosting
 * a member of the distributed system.
 * 
 * @author rishim
 * @since 7.0
 *
 */
public class OSMetrics {
  
  /**
   * Maximum number file descriptor which can be opened
   */
  private long maxFileDescriptorCount;

  /**
   * Current number of open file descriptor count
   */
  private long openFileDescriptorCount;

  private long processCpuTime;

  private long committedVirtualMemorySize;

  private long totalPhysicalMemorySize;

  private long freePhysicalMemorySize;

  private long totalSwapSpaceSize;

  private long freeSwapSpaceSize;

  /**
   * Returns the operating system name.
   */
  private String name;

  /**
   * Returns the operating system version.
   */
  private String version;

  /**
   * Returns the operating system architecture.
   */
  private String arch;

  /**
   * Returns the number of processors available to the Java virtual machine.
   * This method is equivalent to the {@link Runtime#availableProcessors()}
   * method.
   */
  private int availableProcessors;

  /**
   * * Returns the system load average for the last minute. The system load
   * average is the sum of the number of runnable entities queued to the
   * {@linkplain #getAvailableProcessors available processors} and the number of
   * runnable entities running on the available processors averaged over a
   * period of time. The way in which the load average is calculated is
   * operating system specific but is typically a damped time-dependent average.
   */
  private double systemLoadAverage;

  /**
   * 
   * This constructor is to be used by internal JMX framework only. User should
   * not try to create an instance of this class.
   */
  @ConstructorProperties( { "maxFileDescriptorCount",
      "openFileDescriptorCount", "processCpuTime",
      "committedVirtualMemorySize", "totalPhysicalMemorySize",
      "freePhysicalMemorySize", "totalSwapSpaceSize", "freeSwapSpaceSize",
      "name", "version", "arch", "availableProcessors", "systemLoadAverage"

  })
  public OSMetrics(long maxFileDescriptorCount, long openFileDescriptorCount,
      long processCpuTime, long committedVirtualMemorySize,
      long totalPhysicalMemorySize, long freePhysicalMemorySize,
      long totalSwapSpaceSize, long freeSwapSpaceSize, String name,
      String version, String arch, int availableProcessors,
      double systemLoadAverage) {
    this.maxFileDescriptorCount = maxFileDescriptorCount;
    this.openFileDescriptorCount = openFileDescriptorCount;
    this.processCpuTime = processCpuTime;
    this.committedVirtualMemorySize = committedVirtualMemorySize;
    this.totalPhysicalMemorySize = totalPhysicalMemorySize;
    this.freePhysicalMemorySize = freePhysicalMemorySize;
    this.totalSwapSpaceSize = totalSwapSpaceSize;
    this.freeSwapSpaceSize = freeSwapSpaceSize;
    this.name = name;
    this.version = version;
    this.arch = arch;
    this.availableProcessors = availableProcessors;
    this.systemLoadAverage = systemLoadAverage;

  }

  /**
   * Returns the maximum number of open file descriptors allowed by the
   * operating system.
   */
  public long getMaxFileDescriptorCount() {
    return maxFileDescriptorCount;
  }

  /**
   * Returns the current number of open file descriptors..
   */
  public long getOpenFileDescriptorCount() {
    return openFileDescriptorCount;
  }

  /**
   * Returns the amount of time (in nanoseconds) used by the member's process.
   */
  public long getProcessCpuTime() {
    return processCpuTime;
  }

  /**
   * Returns the current number of megabytes of memory allocated.
   */
  public long getCommittedVirtualMemorySize() {
    return committedVirtualMemorySize;
  }

  /**
   * Returns the number of megabytes of memory available to the operating
   * system.
   */
  public long getTotalPhysicalMemorySize() {
    return totalPhysicalMemorySize;
  }

  /**
   * Returns the number of megabytes of free memory available to the operating
   * system.
   */
  public long getFreePhysicalMemorySize() {
    return freePhysicalMemorySize;
  }

  /**
   * Returns the number of megabytes of swap space allocated.
   */
  public long getTotalSwapSpaceSize() {
    return totalSwapSpaceSize;
  }

  /**
   * Returns the number of megabytes of free swap space.
   */
  public long getFreeSwapSpaceSize() {
    return freeSwapSpaceSize;
  }

  /**
   * Returns the name of the operating system.
   */
  public String getName() {
    return name;
  }

  /**
   * Returns the version of the operating system.
   */
  public String getVersion() {
    return version;
  }

  /**
   * Returns the hardware architecture.
   */
  public String getArch() {
    return arch;
  }

  /**
   * Returns the number of available processors.
   */
  public int getAvailableProcessors() {
    return availableProcessors;
  }

  /**
   * Returns the system load average.
   */
  public double getSystemLoadAverage() {
    return systemLoadAverage;
  }

  /**
   * String representation of OSMetrics
   */
  @Override
  public String toString() {

    return "{OSMetrics : maxFileDescriptorCount = " + maxFileDescriptorCount
        + " openFileDescriptorCount = " + openFileDescriptorCount
        + " processCpuTime = " + processCpuTime
        + " committedVirtualMemorySize = " + committedVirtualMemorySize
        + " totalPhysicalMemorySize = " + totalPhysicalMemorySize
        + " freePhysicalMemorySize = " + freePhysicalMemorySize
        + " totalSwapSpaceSize = " + totalSwapSpaceSize
        + " freeSwapSpaceSize = " + freeSwapSpaceSize + " name = " + name
        + " version = " + version + " arch = " + arch
        + " availableProcessors = " + availableProcessors
        + " systemLoadAverage = " + systemLoadAverage + "}";
  }
}