/*
* Copyright © 2014-2015 Cask Data, Inc.
*
* 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 co.cask.cdap.etl.api;
import co.cask.cdap.api.metrics.Metrics;
/**
* The interface exposes method for emitting user metrics from ETL stage.
*/
public interface StageMetrics extends Metrics {
/**
* Increases the value of the specific metric by delta. Metrics name will be prefixed by the
* stage id, hence it will be aggregated for the current stage.
*
* @param metricName Name of the counter. Use alphanumeric characters in metric names.
* @param delta The value to increase by.
*/
@Override
void count(String metricName, int delta);
/**
* Sets the specific metric to the provided value. Metrics name will be prefixed by the
* stage id, hence it will be aggregated for the current stage.
*
* @param metricName Name of the counter. Use alphanumeric characters in metric names.
* @param value The value to be set.
*/
@Override
void gauge(String metricName, long value);
/**
* Increases the value of the specific metric by delta. Metrics emitted will be aggregated
* for the whole ETL pipeline.
*
* @param metricName Name of the counter. Use alphanumeric characters in metric names.
* @param delta The value to increase by.
*/
void pipelineCount(String metricName, int delta);
/**
* Sets the specific metric to the provided value. Metrics emitted will be aggregated
* for the whole ETL pipeline.
*
* @param metricName Name of the counter. Use alphanumeric characters in metric names.
* @param value The value to be set.
*/
void pipelineGauge(String metricName, long value);
}