1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.internal.logger;
  27 
  28 import java.util.function.Function;
  29 import sun.util.logging.PlatformLogger;
  30 
  31 /**
  32  * A simple console logger used to emulate the behavior of JUL loggers when
  33  * java.util.logging has no custom configuration.
  34  * Surrogate loggers are usually only used temporarily, until the LogManager
  35  * is initialized. At this point, the surrogates are replaced by an actual
  36  * logger obtained from LogManager.
  37  */
  38 public final class SurrogateLogger extends SimpleConsoleLogger {
  39 
  40     private static final PlatformLogger.Level JUL_DEFAULT_LEVEL =
  41             PlatformLogger.Level.INFO;
  42     private static volatile String simpleFormatString;
  43 
  44     SurrogateLogger(String name) {
  45         super(name, true);
  46     }
  47 
  48     @Override
  49     PlatformLogger.Level defaultPlatformLevel() {
  50         return JUL_DEFAULT_LEVEL;
  51     }
  52 
  53     @Override
  54     String getSimpleFormatString() {
  55         if (simpleFormatString == null) {
  56             simpleFormatString = getSimpleFormat(null);
  57         }
  58         return simpleFormatString;
  59     }
  60 
  61     public static String getSimpleFormat(Function<String, String> defaultPropertyGetter) {
  62         return Formatting.getSimpleFormat(Formatting.JUL_FORMAT_PROP_KEY, defaultPropertyGetter);
  63     }
  64 
  65     public static SurrogateLogger makeSurrogateLogger(String name) {
  66         return new SurrogateLogger(name);
  67     }
  68 
  69     public static boolean isFilteredFrame(StackWalker.StackFrame st) {
  70         return Formatting.isFilteredFrame(st);
  71     }
  72 }