| /** |
| * 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.ambari.metrics.core.loadsimulator.data; |
| |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.ambari.metrics.core.loadsimulator.util.TimeStampProvider; |
| import org.apache.ambari.metrics.core.loadsimulator.util.RandomMetricsProvider; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * MetricsGeneratorConfigurer is a factory that reads metrics definition from a file, |
| * and returns an Single HostMetricsGenerator. Check createMetricsForHost method |
| * for details. |
| */ |
| public class MetricsGeneratorConfigurer { |
| |
| private final static Logger LOG = LoggerFactory.getLogger |
| (MetricsGeneratorConfigurer.class); |
| |
| /** |
| * Creates HostMetricsGenerator configured with metric names loaded from file. |
| * |
| * @param id ApplicationInstance descriptor, will be used to create |
| * HostMetricsGenerator, cannot be null |
| * @param timeStamps configured TimeStampProvider that can provide next |
| * timestamp, cannot be null |
| * @return HostMetricsGenerator with given ApplicationInstance id and configured |
| * mapping of |
| * metric names to data providers |
| */ |
| public static HostMetricsGenerator createMetricsForHost( |
| ApplicationInstance id, |
| TimeStampProvider timeStamps) { |
| return new HostMetricsGenerator(id, timeStamps, readMetrics(id.getAppId())); |
| } |
| |
| private static Map<String, RandomMetricsProvider> readMetrics(AppID type) { |
| InputStream input = null; |
| Map<String, RandomMetricsProvider> metrics = |
| new HashMap<String, RandomMetricsProvider>(); |
| String fileName = "metrics_def/" + type.toString() + ".dat"; |
| |
| try { |
| LOG.info("Loading " + fileName); |
| |
| input = MetricsGeneratorConfigurer.class.getClassLoader() |
| .getResourceAsStream(fileName); |
| |
| BufferedReader reader = new BufferedReader(new InputStreamReader(input)); |
| |
| String line; |
| while ((line = reader.readLine()) != null) { |
| metrics.put(line.trim(), new RandomMetricsProvider(100, 200)); |
| } |
| |
| } catch (IOException e) { |
| LOG.error("Cannot read file " + fileName + " for appID " + type.toString(), e); |
| } finally { |
| if (input != null) { |
| try { |
| input.close(); |
| } catch (IOException ex) { |
| // intentionally left blank, here we cannot do anything |
| } |
| } |
| } |
| |
| return metrics; |
| } |
| } |