| /** |
| * 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.storm.metrics2.filters; |
| |
| import com.codahale.metrics.Metric; |
| import java.util.Map; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| public class RegexFilter implements StormMetricsFilter { |
| |
| private Pattern pattern; |
| |
| |
| @Override |
| public void prepare(Map<String, Object> config) { |
| String expression = (String) config.get("expression"); |
| if (expression != null) { |
| this.pattern = Pattern.compile(expression); |
| } else { |
| throw new IllegalStateException("RegexFilter requires an 'expression' parameter."); |
| } |
| } |
| |
| @Override |
| public boolean matches(String name, Metric metric) { |
| Matcher matcher = this.pattern.matcher(name); |
| return matcher.matches(); |
| } |
| |
| } |