| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.metrics2.sink.ganglia; |
| |
| import org.apache.hadoop.metrics2.MetricsInfo; |
| import org.apache.hadoop.metrics2.MetricsVisitor; |
| import org.apache.hadoop.metrics2.sink.ganglia.AbstractGangliaSink.GangliaSlope; |
| |
| /** |
| * Since implementations of Metric are not public, hence use a visitor to figure |
| * out the type and slope of the metric. Counters have "positive" slope. |
| */ |
| class GangliaMetricVisitor implements MetricsVisitor { |
| private static final String INT32 = "int32"; |
| private static final String FLOAT = "float"; |
| private static final String DOUBLE = "double"; |
| |
| private String type; |
| private GangliaSlope slope; |
| |
| /** |
| * @return the type of a visited metric |
| */ |
| String getType() { |
| return type; |
| } |
| |
| /** |
| * @return the slope of a visited metric. Slope is positive for counters and |
| * null for others |
| */ |
| GangliaSlope getSlope() { |
| return slope; |
| } |
| |
| @Override |
| public void gauge(MetricsInfo info, int value) { |
| // MetricGaugeInt.class ==> "int32" |
| type = INT32; |
| slope = null; // set to null as cannot figure out from Metric |
| } |
| |
| @Override |
| public void gauge(MetricsInfo info, long value) { |
| // MetricGaugeLong.class ==> "float" |
| type = FLOAT; |
| slope = null; // set to null as cannot figure out from Metric |
| } |
| |
| @Override |
| public void gauge(MetricsInfo info, float value) { |
| // MetricGaugeFloat.class ==> "float" |
| type = FLOAT; |
| slope = null; // set to null as cannot figure out from Metric |
| } |
| |
| @Override |
| public void gauge(MetricsInfo info, double value) { |
| // MetricGaugeDouble.class ==> "double" |
| type = DOUBLE; |
| slope = null; // set to null as cannot figure out from Metric |
| } |
| |
| @Override |
| public void counter(MetricsInfo info, int value) { |
| // MetricCounterInt.class ==> "int32" |
| type = INT32; |
| // counters have positive slope |
| slope = GangliaSlope.positive; |
| } |
| |
| @Override |
| public void counter(MetricsInfo info, long value) { |
| // MetricCounterLong.class ==> "float" |
| type = FLOAT; |
| // counters have positive slope |
| slope = GangliaSlope.positive; |
| } |
| } |