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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.internal.statistics;

import com.gemstone.gemfire.Statistics;
import com.gemstone.gemfire.i18n.LogWriterI18n;

/**
 * Defines the minimal contract for a StatisticsSampler. This is used by
 * classes that need to interact with the sampler.
 * 
 * @author Kirk Lund
 * @since 7.0
 */
public interface StatisticsSampler {

  /**
   * Returns the number of times a statistics resource has been add or deleted.
   */
  public int getStatisticsModCount();
  
  /**
   * Returns an array of all the current statistics resource instances.
   */
  public Statistics[] getStatistics();
  
  /**
   * Returns the logger in use by this sampler.
   */
  public LogWriterI18n getLogger();
  
  /**
   * Waits for the SampleCollector to be created and initialized.
   * 
   * @param timeout maximum number of milliseconds to wait
   * @return the initialized SampleCollector or null if timed out
   * @throws InterruptedException if the current thread is interrupted while waiting
   */
  public SampleCollector waitForSampleCollector(long timeout) throws InterruptedException;
  
  /**
   * Waits for at least one statistics sample to occur before returning.
   * 
   * @param timeout maximum number of milliseconds to wait
   * @return true if a statistics sample occurred; false if wait timed out
   * @throws InterruptedException if the current thread is interrupted while waiting
   */
  public boolean waitForSample(long timeout) throws InterruptedException;
}