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Statistical sampling library for use in virtdata libraries, based on apache commons math 4

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/*
 * 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.util;

import java.util.NoSuchElementException;
import java.util.Stack;

import org.apache.logging.log4j.LogBuilder;
import org.apache.logging.log4j.status.StatusLogger;

/**
 * Consider this class private. Provides various methods to determine the caller class. 

Background

*/ public final class StackLocatorUtil { private static StackLocator stackLocator = null; private static volatile boolean errorLogged = false; static { stackLocator = StackLocator.getInstance(); } private StackLocatorUtil() { } // TODO: return Object.class instead of null (though it will have a null ClassLoader) // (MS) I believe this would work without any modifications elsewhere, but I could be wrong // migrated from ReflectiveCallerClassUtility @PerformanceSensitive public static Class getCallerClass(final int depth) { return stackLocator.getCallerClass(depth + 1); } public static StackTraceElement getStackTraceElement(final int depth) { return stackLocator.getStackTraceElement(depth + 1); } // migrated from ClassLoaderContextSelector @PerformanceSensitive public static Class getCallerClass(final String fqcn) { return getCallerClass(fqcn, Strings.EMPTY); } // migrated from Log4jLoggerFactory @PerformanceSensitive public static Class getCallerClass(final String fqcn, final String pkg) { return stackLocator.getCallerClass(fqcn, pkg); } // added for use in LoggerAdapter implementations mainly @PerformanceSensitive public static Class getCallerClass(final Class anchor) { return stackLocator.getCallerClass(anchor); } // migrated from ThrowableProxy @PerformanceSensitive public static Stack> getCurrentStackTrace() { return stackLocator.getCurrentStackTrace(); } public static StackTraceElement calcLocation(final String fqcnOfLogger) { try { return stackLocator.calcLocation(fqcnOfLogger); } catch (NoSuchElementException ex) { if (!errorLogged) { errorLogged = true; StatusLogger.getLogger().warn("Unable to locate stack trace element for {}", fqcnOfLogger, ex); } return null; } } }




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