com.gemstone.gemfire.admin.internal.StatisticResourceImpl Maven / Gradle / Ivy

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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.admin.internal;

import com.gemstone.gemfire.admin.AdminException;
import com.gemstone.gemfire.admin.SystemMember;
import com.gemstone.gemfire.admin.Statistic;
import com.gemstone.gemfire.internal.Assert;
import com.gemstone.gemfire.internal.admin.Stat;
import com.gemstone.gemfire.internal.admin.StatResource;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
//import com.gemstone.gemfire.internal.admin.SystemMember;

import java.util.ArrayList;
//import java.util.Date;
import java.util.List;

/**
 * Provides monitoring of a statistic resource.
 *
 * @author    Kirk Lund
 * @since     3.5
 */
public class StatisticResourceImpl 
implements com.gemstone.gemfire.admin.StatisticResource {

  /** The underlying remote StatResource which this object delegates to */
  protected StatResource statResource;
  /** Displayable name of this statistic resource */
  protected String name;
  /** Description of this statistic resource */
  protected String description;
  /** Classification type of this statistic resource */
  protected String type;
  /** GemFire system member which owns this statistic resource */
  protected SystemMember member;
  /** The array of statistics in this resource */
  protected Statistic[] statistics; // = new Statistic[0];
  
  // -------------------------------------------------------------------------
  //   Constructor(s)
  // -------------------------------------------------------------------------
  
  /**
   * Constructs an instance of StatisticResourceImpl.
   *
   * @param statResource  the admin StatResource to manage/monitor
   * @param member        the SystemMember owning this resource
   * @exception com.gemstone.gemfire.admin.AdminException 
   *            if unable to create this StatisticResource for administration
   */
  public StatisticResourceImpl(StatResource statResource,
                               SystemMember member)
                        throws com.gemstone.gemfire.admin.AdminException {
    this.statResource = statResource;
    this.member = member;
    this.name = this.statResource.getName();
    this.description = this.statResource.getDescription();
    this.type = this.statResource.getType();
  }

  // -------------------------------------------------------------------------
  //   Attributes accessors and mutators
  // -------------------------------------------------------------------------

	public String getName() {
		return this.name;
	}
  
	public String getDescription() {
		return this.description;
	}
  
  public String getType() {
    return this.type;
  }
  
	public String getOwner() {
		return this.member.toString();
	}
  
  public Statistic[] getStatistics() {
    if (this.statistics == null) {
      try {
        refresh();
      }
      catch (AdminException e) {
        this.statistics = new Statistic[0];
      }
    }
    return this.statistics;
  }

  public long getUniqueId() {
    return this.statResource.getResourceUniqueID();
  }
  
  // -------------------------------------------------------------------------
  //   Operations
  // -------------------------------------------------------------------------

  public void refresh() throws com.gemstone.gemfire.admin.AdminException {
    Stat[] stats = null;
    if (this.statResource != null) {
      stats = this.statResource.getStats();
    }
    if (stats == null || stats.length < 1) {
      throw new AdminException(LocalizedStrings.StatisticResourceImpl_FAILED_TO_REFRESH_STATISTICS_0_FOR_1.toLocalizedString(getType()+"-"+getName(), getOwner()));
    }
    
    if (this.statistics == null || this.statistics.length < 1) {
      // define new statistics instances...
      List statList = new ArrayList();
      for (int i = 0; i < stats.length; i++) {
        statList.add(createStatistic(stats[i]));
      }
      this.statistics = (Statistic[]) statList.toArray(new Statistic[0]);
    }
    else {
      // update the existing instances...
      for (int i = 0; i < stats.length; i++) {
        updateStatistic(stats[i]);
      }
    }
  }

  // -------------------------------------------------------------------------
  //   Non-public implementation methods
  // -------------------------------------------------------------------------
  
  /**
   * Updates the value of the {@link Statistic} corresponding to the internal 
   * {@link com.gemstone.gemfire.internal.admin.Stat}
   *
   * @param stat  the internal stat to use in updating the matching statistic
   */
  private void updateStatistic(Stat stat) {
    for (int i = 0; i < this.statistics.length; i++) {
      if (this.statistics[i].getName().equals(stat.getName())) {
        ((StatisticImpl)this.statistics[i]).setStat(stat);
        return;
      }
    }
    Assert.assertTrue(false, "Unknown stat: " + stat.getName());
  }
  
  /**
   * Creates a new {@link StatisticImpl} to represent the internal {@link 
   * com.gemstone.gemfire.internal.admin.Stat}
   *
   * @param stat  the internal stat to wrap in a new statistic
   */
  protected Statistic createStatistic(Stat stat) {
    return new StatisticImpl(stat);
  }
  
	/**
	 * Returns a string representation of the object.
	 * 
	 * @return a string representation of the object
	 */
  @Override
	public String toString() {
		return getName();
	}
  
}