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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 java.util.List;

/**
 * Defines the operations required to handle statistics samples and receive
 * notifications of ResourceTypes and ResourceInstances.
 * 
 * @author Kirk Lund
 * @since 7.0
 */
public interface SampleHandler {

 /**
  * Notification that a statistics sample has occurred.
  * 

* The timeStamp is an arbitrary nanoseconds time stamp only used for * archiving to stats files. The initial time in system milliseconds and the * first NanoTimer timeStamp are both written to the archive file. Thereafter * only the NanoTimer timeStamp is written to the archive file for each * sample. The delta in nanos can be determined by comparing any nano * timeStamp to the first nano timeStamp written to the archive file. Adding * this delta to the recorded initial time in milliseconds provides the * actual (non-arbitrary) time for each sample. * * @param nanosTimeStamp an arbitrary nanoseconds time stamp for this sample * @param resourceInstances the statistics resource instances captured in * this sample */ public void sampled(long nanosTimeStamp, List resourceInstances); /** * Notification that a new statistics {@link ResourceType} has been created. * * @param resourceType the new statistics ResourceType that was created */ public void allocatedResourceType(ResourceType resourceType); /** * Notification that a new statistics {@link ResourceInstance} has been * created. * * @param resourceInstance the new statistics ResourceInstance that was * created */ public void allocatedResourceInstance(ResourceInstance resourceInstance); /** * Notification that an existing statistics {@link ResourceInstance} has been * destroyed. * * @param resourceInstance the existing statistics ResourceInstance that was * destroyed */ public void destroyedResourceInstance(ResourceInstance resourceInstance); }





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