/* | |
* 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.logging.log4j.core.async; | |
import java.util.regex.Matcher; | |
import java.util.regex.Pattern; | |
import org.apache.logging.log4j.status.StatusLogger; | |
import org.apache.logging.log4j.util.Constants; | |
import org.apache.logging.log4j.util.PropertiesUtil; | |
/** | |
* Strategy for deciding whether thread name should be cached or not. | |
*/ | |
public enum ThreadNameCachingStrategy { // LOG4J2-467 | |
CACHED { | |
@Override | |
public String getThreadName() { | |
String result = THREADLOCAL_NAME.get(); | |
if (result == null) { | |
result = Thread.currentThread().getName(); | |
THREADLOCAL_NAME.set(result); | |
} | |
return result; | |
} | |
}, | |
UNCACHED { | |
@Override | |
public String getThreadName() { | |
return Thread.currentThread().getName(); | |
} | |
}; | |
private static final StatusLogger LOGGER = StatusLogger.getLogger(); | |
private static final ThreadLocal<String> THREADLOCAL_NAME = new ThreadLocal<>(); | |
static final ThreadNameCachingStrategy DEFAULT_STRATEGY = isAllocatingThreadGetName() ? CACHED : UNCACHED; | |
abstract String getThreadName(); | |
public static ThreadNameCachingStrategy create() { | |
final String name = PropertiesUtil.getProperties().getStringProperty("AsyncLogger.ThreadNameStrategy"); | |
try { | |
final ThreadNameCachingStrategy result = name != null ? ThreadNameCachingStrategy.valueOf(name) : DEFAULT_STRATEGY; | |
LOGGER.debug("AsyncLogger.ThreadNameStrategy={} (user specified {}, default is {})", | |
result.name(), name, DEFAULT_STRATEGY.name()); | |
return result; | |
} catch (final Exception ex) { | |
LOGGER.debug("Using AsyncLogger.ThreadNameStrategy.{}: '{}' not valid: {}", | |
DEFAULT_STRATEGY.name(), name, ex.toString()); | |
return DEFAULT_STRATEGY; | |
} | |
} | |
static boolean isAllocatingThreadGetName() { | |
// LOG4J2-2052, LOG4J2-2635 JDK 8u102 ("1.8.0_102") removed the String allocation in Thread.getName() | |
if (Constants.JAVA_MAJOR_VERSION == 8) { | |
try { | |
Pattern javaVersionPattern = Pattern.compile("(\\d+)\\.(\\d+)\\.(\\d+)_(\\d+)"); | |
Matcher m = javaVersionPattern.matcher(System.getProperty("java.version")); | |
if (m.matches()) { | |
return Integer.parseInt(m.group(3)) == 0 && Integer.parseInt(m.group(4)) < 102; | |
} | |
return true; | |
} catch (Exception e) { | |
return true; | |
} | |
} else { | |
return Constants.JAVA_MAJOR_VERSION < 8; | |
} | |
} | |
} |