org.jboss.threads.ThreadNameInfo Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.jboss.threads;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
/**
* Thread name information.
*/
final class ThreadNameInfo {
private final long globalThreadSequenceNum;
private final long perFactoryThreadSequenceNum;
private final long factorySequenceNum;
ThreadNameInfo(final long globalThreadSequenceNum, final long perFactoryThreadSequenceNum, final long factorySequenceNum) {
this.globalThreadSequenceNum = globalThreadSequenceNum;
this.perFactoryThreadSequenceNum = perFactoryThreadSequenceNum;
this.factorySequenceNum = factorySequenceNum;
}
public long getGlobalThreadSequenceNum() {
return globalThreadSequenceNum;
}
public long getPerFactoryThreadSequenceNum() {
return perFactoryThreadSequenceNum;
}
public long getFactorySequenceNum() {
return factorySequenceNum;
}
private static final Pattern searchPattern = Pattern.compile("([^%]+)|%.");
/**
* Format the thread name string.
*
* - {@code %%} - emit a percent sign
* - {@code %t} - emit the per-factory thread sequence number
* - {@code %g} - emit the global thread sequence number
* - {@code %f} - emit the factory sequence number
* - {@code %p} - emit the {@code ":"}-separated thread group path
* - {@code %i} - emit the thread ID
* - {@code %G} - emit the thread group name
*
*
* @param thread the thread
* @param formatString the format string
* @return the thread name string
*/
public String format(Thread thread, String formatString) {
final StringBuilder builder = new StringBuilder(formatString.length() * 5);
final ThreadGroup group = thread.getThreadGroup();
final Matcher matcher = searchPattern.matcher(formatString);
while (matcher.find()) {
if (matcher.group(1) != null) {
builder.append(matcher.group());
} else {
switch (matcher.group().charAt(1)) {
case '%': builder.append('%'); break;
case 't': builder.append(perFactoryThreadSequenceNum); break;
case 'g': builder.append(globalThreadSequenceNum); break;
case 'f': builder.append(factorySequenceNum); break;
case 'p': if (group != null) appendGroupPath(group, builder); break;
case 'i': builder.append(thread.getId()); break;
case 'G': if (group != null) builder.append(group.getName()); break;
}
}
}
return builder.toString();
}
private static void appendGroupPath(ThreadGroup group, StringBuilder builder) {
final ThreadGroup parent = group.getParent();
if (parent != null) {
appendGroupPath(parent, builder);
builder.append(':');
}
builder.append(group.getName());
}
}