001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.util.concurrent; 018 019import java.util.concurrent.atomic.AtomicLong; 020import java.util.regex.Matcher; 021import java.util.regex.Pattern; 022 023import org.apache.camel.util.ObjectHelper; 024 025/** 026 * Various helper method for thread naming. 027 */ 028public final class ThreadHelper { 029 public static final String DEFAULT_PATTERN = "Camel Thread ##counter# - #name#"; 030 private static final Pattern INVALID_PATTERN = Pattern.compile(".*#\\w+#.*"); 031 032 private static AtomicLong threadCounter = new AtomicLong(); 033 034 private ThreadHelper() { 035 } 036 037 private static long nextThreadCounter() { 038 return threadCounter.getAndIncrement(); 039 } 040 041 /** 042 * Creates a new thread name with the given pattern 043 * <p/> 044 * See {@link org.apache.camel.spi.ExecutorServiceManager#setThreadNamePattern(String)} for supported patterns. 045 * 046 * @param pattern the pattern 047 * @param name the name 048 * @return the thread name, which is unique 049 */ 050 public static String resolveThreadName(String pattern, String name) { 051 if (pattern == null) { 052 pattern = DEFAULT_PATTERN; 053 } 054 055 // we support #longName# and #name# as name placeholders 056 String longName = name; 057 String shortName = name.contains("?") ? ObjectHelper.before(name, "?") : name; 058 // must quote the names to have it work as literal replacement 059 shortName = Matcher.quoteReplacement(shortName); 060 longName = Matcher.quoteReplacement(longName); 061 062 // replace tokens 063 String answer = pattern.replaceFirst("#counter#", "" + nextThreadCounter()); 064 answer = answer.replaceFirst("#longName#", longName); 065 answer = answer.replaceFirst("#name#", shortName); 066 067 // are there any #word# combos left, if so they should be considered invalid tokens 068 if (INVALID_PATTERN.matcher(answer).matches()) { 069 throw new IllegalArgumentException("Pattern is invalid: " + pattern); 070 } 071 072 return answer; 073 } 074 075}