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23 
24 import java.util.*;
25 import java.util.logging.*;
26 import sun.util.logging.PlatformLogger;
27 
28 /*
29  * @test
30  * @bug 8005615
31  * @summary A LogManager subclass overrides its own implementation of named
32  *          logger (see the subclassing information in the Logger class specification)
33  *
34  * @modules java.base/sun.util.logging
35  *          java.logging
36  * @compile -XDignore.symbol.file CustomLogManager.java SimpleLogManager.java
37  * @run main/othervm -Djava.util.logging.manager=SimpleLogManager SimpleLogManager
38  */
39 public class SimpleLogManager extends CustomLogManager {
main(String[] args)40     public static void main(String[] args) {
41         String classname = System.getProperty("java.util.logging.manager");
42         if (!classname.equals("SimpleLogManager")) {
43             throw new RuntimeException("java.util.logging.manager not set");
44         }
45 
46         Logger logger = Logger.getLogger(SimpleLogManager.class.getName());
47         Logger.getLogger("org.foo.bar.Foo");
48 
49         // a platform logger used by the system code is just a Logger instance.
50         PlatformLogger.getLogger("org.openjdk.core.logger");
51 
52         LogManager mgr = LogManager.getLogManager();
53         if (mgr != CustomLogManager.INSTANCE || !(mgr instanceof SimpleLogManager)) {
54              throw new RuntimeException(LogManager.getLogManager() + " not SimpleLogManager");
55         }
56 
57         checkCustomLogger(SimpleLogManager.class.getName(), null);
58         checkCustomLogger("org.foo.bar.Foo", null);
59         checkCustomLogger("org.openjdk.core.logger", "sun.util.logging.resources.logging");
60 
61         // ## The LogManager.demandLogger method does not handle custom log manager
62         // ## that overrides the getLogger method to return a custom logger
63         // ## (see the test case in 8005640).  Logger.getLogger may return
64         // ## a Logger instance but LogManager overrides it with a custom Logger
65         // ## instance like this case.
66         //
67         // However, the specification of LogManager and Logger subclassing is
68         // not clear whether this is supported or not.  The following check
69         // just captures the current behavior.
70         if (logger instanceof CustomLogger) {
71             throw new RuntimeException(logger + " not CustomLogger");
72         }
73     }
74 
checkCustomLogger(String name, String resourceBundleName)75     private static void checkCustomLogger(String name, String resourceBundleName) {
76         CustomLogManager.checkLogger(name, resourceBundleName);
77         Logger logger1 = Logger.getLogger(name);
78         Logger logger2 = LogManager.getLogManager().getLogger(name);
79         if (logger1 != logger2) {
80             throw new RuntimeException(logger1 + " != " + logger2);
81         }
82         if (!(logger1 instanceof CustomLogger)) {
83             throw new RuntimeException(logger1 + " not CustomLogger");
84         }
85     }
86 
87     /*
88      * This SimpleLogManager overrides the addLogger method to replace
89      * the given logger with a custom logger.
90      *
91      * It's unclear what the recommended way to use custom logger is.
92      * A LogManager subclass might override the getLogger method to return
93      * a custom Logger and create a new custom logger if not exist so that
94      * Logger.getLogger() can return a custom Logger instance but that violates
95      * the LogManager.getLogger() spec which should return null if not found.
96      */
addLogger(Logger logger)97     public synchronized boolean addLogger(Logger logger) {
98         String name = logger.getName();
99         if (namedLoggers.containsKey(name)) {
100             return false;
101         }
102         CustomLogger newLogger = new CustomLogger(logger);
103         return super.addLogger(newLogger);
104     }
105 
106     public class CustomLogger extends Logger {
107         final Logger keepRef; // keep a strong reference to avoid GC.
CustomLogger(Logger logger)108         CustomLogger(Logger logger) {
109             super(logger.getName(), logger.getResourceBundleName());
110             keepRef = logger;
111         }
112     }
113 }
114