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.lang.ref.Reference;
29 import java.lang.ref.WeakReference;
30 import java.util.HashMap;
31 import java.util.Map;
32 import java.util.function.Function;
33 import java.lang.System.LoggerFinder;
34 import java.lang.System.Logger;
35 import java.lang.ref.ReferenceQueue;
36 import java.util.Collection;
37 import java.util.ResourceBundle;
38
39 /**
40 * Internal Service Provider Interface (SPI) that makes it possible to use
41 * {@code java.util.logging} as backend when the {@link
42 * sun.util.logging.internal.LoggingProviderImpl
43 * sun.util.logging.internal.LoggingProviderImpl} is present.
44 * <p>
45 * The JDK default implementation of the {@link LoggerFinder} will
46 * attempt to locate and load an {@linkplain
47 * java.util.ServiceLoader#loadInstalled(java.lang.Class) installed}
48 * implementation of the {@code DefaultLoggerFinder}. If {@code java.util.logging}
49 * is present, this will usually resolve to an instance of {@link
50 * sun.util.logging.internal.LoggingProviderImpl sun.util.logging.internal.LoggingProviderImpl}.
51 * Otherwise, if no concrete service provider is declared for
52 * {@code DefaultLoggerFinder}, the default implementation provided by this class
53 * will be used.
54 * <p>
55 * When the {@link sun.util.logging.internal.LoggingProviderImpl
112 new HashMap<>();
113 private final ReferenceQueue<Logger> queue = new ReferenceQueue<>();
114
115 synchronized Logger get(Function<String, Logger> loggerSupplier, final String name) {
116 Reference<? extends Logger> ref = loggers.get(name);
117 Logger w = ref == null ? null : ref.get();
118 if (w == null) {
119 w = loggerSupplier.apply(name);
120 loggers.put(name, new WeakReference<>(w, queue));
121 }
122
123 // Remove stale mapping...
124 Collection<Reference<Logger>> values = null;
125 while ((ref = queue.poll()) != null) {
126 if (values == null) values = loggers.values();
127 values.remove(ref);
128 }
129 return w;
130 }
131
132
133 final static SharedLoggers system = new SharedLoggers();
134 final static SharedLoggers application = new SharedLoggers();
135 }
136
137 @Override
138 public final Logger getLogger(String name, /* Module */ Class<?> caller) {
139 checkPermission();
140 return demandLoggerFor(name, caller);
141 }
142
143 @Override
144 public final Logger getLocalizedLogger(String name, ResourceBundle bundle,
145 /* Module */ Class<?> caller) {
146 return super.getLocalizedLogger(name, bundle, caller);
147 }
148
149
150
151 /**
152 * Returns a {@link Logger logger} suitable for the caller usage.
153 *
154 * @implSpec The default implementation for this method is to return a
155 * simple logger that will print all messages of INFO level and above
156 * to the console. That simple logger is not configurable.
157 *
158 * @param name The name of the logger.
159 * @param caller The class on behalf of which the logger is created.
160 * @return A {@link Logger logger} suitable for the application usage.
161 * @throws SecurityException if the calling code does not have the
162 * {@code RuntimePermission("loggerFinder")}.
163 */
164 protected Logger demandLoggerFor(String name, /* Module */ Class<?> caller) {
165 checkPermission();
166 if (caller.getClassLoader() == null) {
167 return SharedLoggers.system.get(SimpleConsoleLogger::makeSimpleLogger, name);
168 } else {
169 return SharedLoggers.application.get(SimpleConsoleLogger::makeSimpleLogger, name);
170 }
171 }
172
173 }
|
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.lang.ref.Reference;
29 import java.lang.ref.WeakReference;
30 import java.util.HashMap;
31 import java.util.Map;
32 import java.util.function.Function;
33 import java.lang.System.LoggerFinder;
34 import java.lang.System.Logger;
35 import java.lang.ref.ReferenceQueue;
36 import java.lang.reflect.Module;
37 import java.security.AccessController;
38 import java.security.PrivilegedAction;
39 import java.util.Collection;
40 import java.util.ResourceBundle;
41
42 /**
43 * Internal Service Provider Interface (SPI) that makes it possible to use
44 * {@code java.util.logging} as backend when the {@link
45 * sun.util.logging.internal.LoggingProviderImpl
46 * sun.util.logging.internal.LoggingProviderImpl} is present.
47 * <p>
48 * The JDK default implementation of the {@link LoggerFinder} will
49 * attempt to locate and load an {@linkplain
50 * java.util.ServiceLoader#loadInstalled(java.lang.Class) installed}
51 * implementation of the {@code DefaultLoggerFinder}. If {@code java.util.logging}
52 * is present, this will usually resolve to an instance of {@link
53 * sun.util.logging.internal.LoggingProviderImpl sun.util.logging.internal.LoggingProviderImpl}.
54 * Otherwise, if no concrete service provider is declared for
55 * {@code DefaultLoggerFinder}, the default implementation provided by this class
56 * will be used.
57 * <p>
58 * When the {@link sun.util.logging.internal.LoggingProviderImpl
115 new HashMap<>();
116 private final ReferenceQueue<Logger> queue = new ReferenceQueue<>();
117
118 synchronized Logger get(Function<String, Logger> loggerSupplier, final String name) {
119 Reference<? extends Logger> ref = loggers.get(name);
120 Logger w = ref == null ? null : ref.get();
121 if (w == null) {
122 w = loggerSupplier.apply(name);
123 loggers.put(name, new WeakReference<>(w, queue));
124 }
125
126 // Remove stale mapping...
127 Collection<Reference<Logger>> values = null;
128 while ((ref = queue.poll()) != null) {
129 if (values == null) values = loggers.values();
130 values.remove(ref);
131 }
132 return w;
133 }
134
135 final static SharedLoggers system = new SharedLoggers();
136 final static SharedLoggers application = new SharedLoggers();
137 }
138
139 public static boolean isSystem(Module m) {
140 ClassLoader cl = AccessController.doPrivileged(new PrivilegedAction<>() {
141 @Override
142 public ClassLoader run() {
143 return m.getClassLoader();
144 }
145 });
146 return cl == null;
147 }
148
149 @Override
150 public final Logger getLogger(String name, Module module) {
151 checkPermission();
152 return demandLoggerFor(name, module);
153 }
154
155 @Override
156 public final Logger getLocalizedLogger(String name, ResourceBundle bundle,
157 Module module) {
158 return super.getLocalizedLogger(name, bundle, module);
159 }
160
161 /**
162 * Returns a {@link Logger logger} suitable for use within the
163 * given {@code module}.
164 *
165 * @implSpec The default implementation for this method is to return a
166 * simple logger that will print all messages of INFO level and above
167 * to the console. That simple logger is not configurable.
168 *
169 * @param name The name of the logger.
170 * @param module The module on behalf of which the logger is created.
171 * @return A {@link Logger logger} suitable for the application usage.
172 * @throws SecurityException if the calling code does not have the
173 * {@code RuntimePermission("loggerFinder")}.
174 */
175 protected Logger demandLoggerFor(String name, Module module) {
176 checkPermission();
177 if (isSystem(module)) {
178 return SharedLoggers.system.get(SimpleConsoleLogger::makeSimpleLogger, name);
179 } else {
180 return SharedLoggers.application.get(SimpleConsoleLogger::makeSimpleLogger, name);
181 }
182 }
183
184 }
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