/**
* 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.camel.util.concurrent;
import java.util.concurrent.atomic.AtomicLong;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.camel.util.ObjectHelper;
/**
* Various helper method for thread naming.
*/
public final class ThreadHelper {
public static final String DEFAULT_PATTERN = "Camel Thread ##counter# - #name#";
private static final Pattern INVALID_PATTERN = Pattern.compile(".*#\\w+#.*");
private static AtomicLong threadCounter = new AtomicLong();
private ThreadHelper() {
}
private static long nextThreadCounter() {
return threadCounter.getAndIncrement();
}
/**
* Creates a new thread name with the given pattern
* <p/>
* See {@link org.apache.camel.spi.ExecutorServiceManager#setThreadNamePattern(String)} for supported patterns.
*
* @param pattern the pattern
* @param name the name
* @return the thread name, which is unique
*/
public static String resolveThreadName(String pattern, String name) {
if (pattern == null) {
pattern = DEFAULT_PATTERN;
}
// we support #longName# and #name# as name placeholders
String longName = name;
String shortName = name.contains("?") ? ObjectHelper.before(name, "?") : name;
// must quote the names to have it work as literal replacement
shortName = Matcher.quoteReplacement(shortName);
longName = Matcher.quoteReplacement(longName);
// replace tokens
String answer = pattern.replaceFirst("#counter#", "" + nextThreadCounter());
answer = answer.replaceFirst("#longName#", longName);
answer = answer.replaceFirst("#name#", shortName);
// are there any #word# combos left, if so they should be considered invalid tokens
if (INVALID_PATTERN.matcher(answer).matches()) {
throw new IllegalArgumentException("Pattern is invalid: " + pattern);
}
return answer;
}
}