| /** |
| * 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.tracing; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.tracing.SpanReceiverInfo.ConfigurationPair; |
| import org.apache.htrace.core.HTraceConfiguration; |
| |
| /** |
| * This class provides utility functions for tracing. |
| */ |
| @InterfaceAudience.Private |
| public class TraceUtils { |
| private static List<ConfigurationPair> EMPTY = Collections.emptyList(); |
| static final String DEFAULT_HADOOP_PREFIX = "hadoop.htrace."; |
| |
| public static HTraceConfiguration wrapHadoopConf(final String prefix, |
| final Configuration conf) { |
| return wrapHadoopConf(prefix, conf, EMPTY); |
| } |
| |
| public static HTraceConfiguration wrapHadoopConf(final String prefix, |
| final Configuration conf, List<ConfigurationPair> extraConfig) { |
| final HashMap<String, String> extraMap = new HashMap<String, String>(); |
| for (ConfigurationPair pair : extraConfig) { |
| extraMap.put(pair.getKey(), pair.getValue()); |
| } |
| return new HTraceConfiguration() { |
| @Override |
| public String get(String key) { |
| String ret = getInternal(prefix + key); |
| if (ret != null) { |
| return ret; |
| } |
| return getInternal(DEFAULT_HADOOP_PREFIX + key); |
| } |
| |
| @Override |
| public String get(String key, String defaultValue) { |
| String ret = get(key); |
| if (ret != null) { |
| return ret; |
| } |
| return defaultValue; |
| } |
| |
| private String getInternal(String key) { |
| if (extraMap.containsKey(key)) { |
| return extraMap.get(key); |
| } |
| return conf.get(key); |
| } |
| }; |
| } |
| } |