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/*******************************************************************************
 * 	Copyright 2016 ContainX and OpenStack4j                                          
 * 	                                                                                 
 * 	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.                                                                     
 *******************************************************************************/

package com.huawei.openstack4j.api.telemetry;

import java.util.List;

import com.huawei.openstack4j.common.RestService;
import com.huawei.openstack4j.model.telemetry.Meter;
import com.huawei.openstack4j.model.telemetry.MeterSample;
import com.huawei.openstack4j.model.telemetry.SampleCriteria;
import com.huawei.openstack4j.model.telemetry.Statistics;

/**
 * Provides Measurements against Meters within an OpenStack deployment
 * 
 * @author Jeremy Unruh
 */
public interface MeterService extends RestService {

	/**
	 * Return all known meters, based on the data recorded so far.
	 * 
	 * @return list of all known meters
	 */
	List list();
	
	/**
	 * Returns samples for the specified Meter
	 * @param meterName the name of the meter to fetch samples from
	 * 
	 * @return List of Samples
	 */
	List samples(String meterName);
	
	/**
     * Returns samples for the specified Meter
     * @param meterName the name of the meter to fetch samples from
     * @param criteria the sample query criteria for filtering results
     * 
     * @return List of Samples
     */
    List samples(String meterName, SampleCriteria criteria);
	
	/**
	 * Returns computed statistics for the given meterName
	 * @param meterName the name of the meter to fetch statistics for
	 * 
	 * @return List of Statistics
	 */
	List statistics(String meterName);
	
	/**
     * Returns computed statistics for the given meterName
     * 
     * @param meterName the name of the meter to fetch statistics for
     * @param criteria additional query criteria
     * @return List of Statistics
     */
    List statistics(String meterName, SampleCriteria criteria);
    
    /**
     * Returns computed statistics for the given meterName
     * 
     * @param meterName the name of the meter to fetch statistics for
     * @param criteria additional query criteria
     * @param period the result will be statistics for a period long of that number of seconds
     * @return List of Statistics
     */
    List statistics(String meterName, SampleCriteria criteria, int period);
	
	/**
	 * Returns computed statistics for the given meterName for the given time range
	 * 
	 * @param meterName the name of the meter to fetch statistics for
	 * @param period the result will be statistics for a period long of that number of seconds
	 * @return List of Statistics
	 */
	List statistics(String meterName, int period);
	
	void putSamples(List sampleList, String meterName);
}