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Posted to notifications@logging.apache.org by GitBox <gi...@apache.org> on 2022/11/15 09:58:45 UTC
[GitHub] [logging-log4j2] mknet commented on a diff in pull request #1140: [LOG4J2-3634] move invocation of propagateLogLevels()
mknet commented on code in PR #1140:
URL: https://github.com/apache/logging-log4j2/pull/1140#discussion_r1022581089
##########
log4j-jul/src/main/java/org/apache/logging/log4j/jul/Log4jBridgeHandler.java:
##########
@@ -1,319 +1,321 @@
-/*
- * 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.jul;
-
-//note: NO import of Logger, Level, LogManager to prevent conflicts JUL/log4j
-import java.beans.PropertyChangeEvent;
-import java.beans.PropertyChangeListener;
-import java.util.Enumeration;
-import java.util.HashSet;
-import java.util.Map;
-import java.util.Set;
-import java.util.logging.LogRecord;
-
-import org.apache.logging.log4j.core.LoggerContext;
-import org.apache.logging.log4j.core.config.Configuration;
-import org.apache.logging.log4j.core.config.LoggerConfig;
-import org.apache.logging.log4j.spi.ExtendedLogger;
-import org.apache.logging.log4j.status.StatusLogger;
-
-
-/**
- * Bridge from JUL to log4j2.<br>
- * This is an alternative to log4j.jul.LogManager (running as complete JUL replacement),
- * especially useful for webapps running on a container for which the LogManager cannot or
- * should not be used.<br><br>
- *
- * Installation/usage:<ul>
- * <li> Declaratively inside JUL's <code>logging.properties</code>:<br>
- * <code>handlers = org.apache.logging.log4j.jul.Log4jBridgeHandler</code><br>
- * (and typically also: <code>org.apache.logging.log4j.jul.Log4jBridgeHandler.propagateLevels = true</code> )<br>
- * Note: in a webapp running on Tomcat, you may create a <code>WEB-INF/classes/logging.properties</code>
- * file to configure JUL for this webapp only: configured handlers and log levels affect your webapp only!
- * This file is then the <i>complete</i> JUL configuration, so JUL's defaults (e.g. log level INFO) apply
- * for stuff not explicitly defined therein.
- * <li> Programmatically by calling <code>install()</code> method,
- * e.g. inside ServletContextListener static-class-init. or contextInitialized()
- * </ul>
- * Configuration (in JUL's <code>logging.properties</code>):<ul>
- * <li> Log4jBridgeHandler.<code>suffixToAppend</code><br>
- * String, suffix to append to JUL logger names, to easily recognize bridged log messages.
- * A dot "." is automatically prepended, so configuration for the basis logger is used<br>
- * Example: <code>Log4jBridgeHandler.suffixToAppend = _JUL</code><br>
- * Useful, for example, if you use JSF because it logs exceptions and throws them afterwards;
- * you can easily recognize the duplicates with this (or concentrate on the non-JUL-logs).
- * <li> Log4jBridgeHandler.<code>propagateLevels</code> boolean, "true" to automatically propagate log4j log levels to JUL.
- * <li> Log4jBridgeHandler.<code>sysoutDebug</code> boolean, perform some (developer) debug output to sysout
- * </ul>
- *
- * Log levels are translated with {@link LevelTranslator}, see also
- * <a href="https://logging.apache.org/log4j/2.x/log4j-jul/index.html#Default_Level_Conversions">log4j doc</a>.<br><br>
- *
- * Restrictions:<ul>
- * <li> Manually given source/location info in JUL (e.g. entering(), exiting(), throwing(), logp(), logrb() )
- * will NOT be considered, i.e. gets lost in log4j logging.
- * <li> Log levels of JUL have to be adjusted according to log4j log levels:
- * Either by using "propagateLevels" (preferred), or manually by specifying them explicitly,
- * i.e. logging.properties and log4j2.xml have some redundancies.
- * <li> Only JUL log events that are allowed according to the JUL log level get to this handler and thus to log4j.
- * This is only relevant and important if you NOT use "propagateLevels".
- * If you set <code>.level = SEVERE</code> only error logs will be seen by this handler and thus log4j
- * - even if the corresponding log4j log level is ALL.<br>
- * On the other side, you should NOT set <code>.level = FINER or FINEST</code> if the log4j level is higher.
- * In this case a lot of JUL log events would be generated, sent via this bridge to log4j and thrown away by the latter.<br>
- * Note: JUL's default log level (i.e. none specified in logger.properties) is INFO.
- * </ul>
- *
- * (Credits: idea and concept originate from org.slf4j.bridge.SLF4JBridgeHandler;
- * level propagation idea originates from logback/LevelChangePropagator;
- * but no source code has been copied)
- */
-public class Log4jBridgeHandler extends java.util.logging.Handler implements PropertyChangeListener {
- private static final org.apache.logging.log4j.Logger SLOGGER = StatusLogger.getLogger();
-
- // the caller of the logging is java.util.logging.Logger (for location info)
- private static final String FQCN = java.util.logging.Logger.class.getName();
- private static final String UNKNOWN_LOGGER_NAME = "unknown.jul.logger";
- private static final java.util.logging.Formatter julFormatter = new java.util.logging.SimpleFormatter();
-
- private boolean doDebugOutput = false;
- private String julSuffixToAppend = null;
- //not needed: private boolean installAsLevelPropagator = false;
-
-
- /**
- * Adds a new Log4jBridgeHandler instance to JUL's root logger.
- * This is a programmatic alternative to specify
- * <code>handlers = org.apache.logging.log4j.jul.Log4jBridgeHandler</code>
- * and its configuration in logging.properties.<br>
- * @param removeHandlersForRootLogger true to remove all other installed handlers on JUL root level
- */
- public static void install(boolean removeHandlersForRootLogger, String suffixToAppend, boolean propagateLevels) {
- java.util.logging.Logger rootLogger = getJulRootLogger();
- if (removeHandlersForRootLogger) {
- for (java.util.logging.Handler hdl : rootLogger.getHandlers()) {
- rootLogger.removeHandler(hdl);
- }
- }
- rootLogger.addHandler(new Log4jBridgeHandler(false, suffixToAppend, propagateLevels));
- // note: filter-level of Handler defaults to ALL, so nothing to do here
- }
-
- private static java.util.logging.Logger getJulRootLogger() {
- return java.util.logging.LogManager.getLogManager().getLogger("");
- }
-
-
- /** Initialize this handler by reading out JUL configuration. */
- public Log4jBridgeHandler() {
- final java.util.logging.LogManager julLogMgr = java.util.logging.LogManager.getLogManager();
- final String className = this.getClass().getName();
- init(Boolean.parseBoolean(julLogMgr.getProperty(className + ".sysoutDebug")),
- julLogMgr.getProperty(className + ".appendSuffix"),
- Boolean.parseBoolean(julLogMgr.getProperty(className + ".propagateLevels")) );
-
- }
-
- /** Initialize this handler with given configuration. */
- public Log4jBridgeHandler(boolean debugOutput, String suffixToAppend, boolean propagateLevels) {
- init(debugOutput, suffixToAppend, propagateLevels);
- }
-
-
- /** Perform init. of this handler with given configuration (typical use is for constructor). */
- protected void init(boolean debugOutput, String suffixToAppend, boolean propagateLevels) {
- this.doDebugOutput = debugOutput;
- if (debugOutput) {
- new Exception("DIAGNOSTIC ONLY (sysout): Log4jBridgeHandler instance created (" + this + ")")
- .printStackTrace(System.out); // is no error thus no syserr
- }
-
- if (suffixToAppend != null) {
- suffixToAppend = suffixToAppend.trim(); // remove spaces
- if (suffixToAppend.isEmpty()) {
- suffixToAppend = null;
- } else if (suffixToAppend.charAt(0) != '.') { // always make it a sub-logger
- suffixToAppend = '.' + suffixToAppend;
- }
- }
- this.julSuffixToAppend = suffixToAppend;
-
- //not needed: this.installAsLevelPropagator = propagateLevels;
- if (propagateLevels) {
- @SuppressWarnings("resource") // no need to close the AutoCloseable ctx here
- LoggerContext context = LoggerContext.getContext(false);
- context.addPropertyChangeListener(this);
- propagateLogLevels(context.getConfiguration());
- // note: java.util.logging.LogManager.addPropertyChangeListener() could also
- // be set here, but a call of JUL.readConfiguration() will be done on purpose
- }
-
- SLOGGER.debug("Log4jBridgeHandler init. with: suffix='{}', lvlProp={}, instance={}",
- suffixToAppend, propagateLevels, this);
- }
-
-
- @Override
- public void close() {
- // cleanup and remove listener and JUL logger references
- julLoggerRefs = null;
- LoggerContext.getContext(false).removePropertyChangeListener(this);
- if (doDebugOutput) {
- System.out.println("sysout: Log4jBridgeHandler close(): " + this);
- }
- }
-
-
- @Override
- public void publish(LogRecord record) {
- if (record == null) { // silently ignore null records
- return;
- }
-
- org.apache.logging.log4j.Logger log4jLogger = getLog4jLogger(record);
- String msg = julFormatter.formatMessage(record); // use JUL's implementation to get real msg
- /* log4j allows nulls:
- if (msg == null) {
- // JUL allows nulls, but other log system may not
- msg = "<null log msg>";
- } */
- org.apache.logging.log4j.Level log4jLevel = LevelTranslator.toLevel(record.getLevel());
- Throwable thrown = record.getThrown();
- if (log4jLogger instanceof ExtendedLogger) {
- // relevant for location information
- try {
- ((ExtendedLogger) log4jLogger).logIfEnabled(FQCN, log4jLevel, null, msg, thrown);
- } catch (NoClassDefFoundError e) {
- // sometimes there are problems with log4j.ExtendedStackTraceElement, so try a workaround
- log4jLogger.warn("Log4jBridgeHandler: ignored exception when calling 'ExtendedLogger': {}", e.toString());
- log4jLogger.log(log4jLevel, msg, thrown);
- }
- } else {
- log4jLogger.log(log4jLevel, msg, thrown);
- }
- }
-
-
- @Override
- public void flush() {
- // nothing to do
- }
-
-
- /**
- * Return the log4j-Logger instance that will be used for logging.
- * Handles null name case and appends configured suffix.
- */
- private org.apache.logging.log4j.Logger getLog4jLogger(LogRecord record) {
- String name = record.getLoggerName();
- if (name == null) {
- name = UNKNOWN_LOGGER_NAME;
- } else if (julSuffixToAppend != null) {
- name += julSuffixToAppend;
- }
- return org.apache.logging.log4j.LogManager.getLogger(name);
- }
-
-
-///// log level propagation code
-
-
- @Override
- // impl. for PropertyChangeListener
- public void propertyChange(PropertyChangeEvent evt) {
- SLOGGER.debug("Log4jBridgeHandler.propertyChange(): {}", evt);
- if (LoggerContext.PROPERTY_CONFIG.equals(evt.getPropertyName()) && evt.getNewValue() instanceof Configuration) {
- propagateLogLevels((Configuration) evt.getNewValue());
- }
- }
-
-
- /** Save "hard" references to configured JUL loggers. (is lazy init.) */
- private Set<java.util.logging.Logger> julLoggerRefs;
- /** Perform developer tests? (Should be unused/outcommented for real code) */
- //private static final boolean DEVTEST = false;
-
-
- private void propagateLogLevels(Configuration config) {
- SLOGGER.debug("Log4jBridgeHandler.propagateLogLevels(): {}", config);
- // clear or init. saved JUL logger references
- // JUL loggers have to be explicitly referenced because JUL internally uses
- // weak references so not instantiated loggers may be garbage collected
- // and their level config gets lost then.
- if (julLoggerRefs == null) {
- julLoggerRefs = new HashSet<>();
- } else {
- julLoggerRefs.clear();
- }
-
- //if (DEVTEST) debugPrintJulLoggers("Start of propagation");
- // walk through all log4j configured loggers and set JUL level accordingly
- final Map<String, LoggerConfig> log4jLoggers = config.getLoggers();
- //java.util.List<String> outTxt = new java.util.ArrayList<>(); // DEVTEST / DEV-DEBUG ONLY
- for (LoggerConfig lcfg : log4jLoggers.values()) {
- java.util.logging.Logger julLog = java.util.logging.Logger.getLogger(lcfg.getName()); // this also fits for root = ""
- java.util.logging.Level julLevel = LevelTranslator.toJavaLevel(lcfg.getLevel()); // lcfg.getLevel() never returns null
- julLog.setLevel(julLevel);
- julLoggerRefs.add(julLog); // save an explicit reference to prevent GC
- //if (DEVTEST) outTxt.add("propagating '" + lcfg.getName() + "' / " + lcfg.getLevel() + " -> " + julLevel);
- } // for
- //if (DEVTEST) java.util.Collections.sort(outTxt, String.CASE_INSENSITIVE_ORDER);
- //if (DEVTEST) for (String s : outTxt) System.out.println("+ " + s);
- //if (DEVTEST) debugPrintJulLoggers("After propagation");
-
- // cleanup JUL: reset all log levels not explicitly given by log4j
- // This has to happen after propagation because JUL creates and inits. the loggers lazily
- // so a nested logger might be created during the propagation-for-loop above and gets
- // its JUL-configured level not until then.
- final java.util.logging.LogManager julMgr = java.util.logging.LogManager.getLogManager();
- for (Enumeration<String> en = julMgr.getLoggerNames(); en.hasMoreElements(); ) {
- java.util.logging.Logger julLog = julMgr.getLogger(en.nextElement());
- if (julLog != null && julLog.getLevel() != null && !"".equals(julLog.getName())
- && !log4jLoggers.containsKey(julLog.getName()) ) {
- julLog.setLevel(null);
- }
- } // for
- //if (DEVTEST) debugPrintJulLoggers("After JUL cleanup");
- }
-
-
- /* DEV-DEBUG ONLY (comment out for release) *xx/
- private void debugPrintJulLoggers(String infoStr) {
- if (!DEVTEST) return;
- java.util.logging.LogManager julMgr = java.util.logging.LogManager.getLogManager();
- System.out.println("sysout: " + infoStr + " - for " + julMgr);
- java.util.List<String> txt = new java.util.ArrayList<>();
- int n = 1;
- for (Enumeration<String> en = julMgr.getLoggerNames(); en.hasMoreElements(); ) {
- String ln = en.nextElement();
- java.util.logging.Logger lg = julMgr.getLogger(ln);
- if (lg == null) {
- txt.add("(!null-Logger '" + ln + "') #" + n);
- } else if (lg.getLevel() == null) {
- txt.add("(null-Level Logger '" + ln + "') #" + n);
- } else {
- txt.add("Logger '" + ln + "', lvl = " + lg.getLevel() + " #" + n);
- }
- n++;
- } // for
- java.util.Collections.sort(txt, String.CASE_INSENSITIVE_ORDER);
- for (String s : txt) {
- System.out.println(" - " + s);
- }
- } /**/
-
-}
+/*
+ * 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.jul;
+
+//note: NO import of Logger, Level, LogManager to prevent conflicts JUL/log4j
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.util.Enumeration;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.LogRecord;
+
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.LoggerConfig;
+import org.apache.logging.log4j.spi.ExtendedLogger;
+import org.apache.logging.log4j.status.StatusLogger;
+
+
+/**
+ * Bridge from JUL to log4j2.<br>
+ * This is an alternative to log4j.jul.LogManager (running as complete JUL replacement),
+ * especially useful for webapps running on a container for which the LogManager cannot or
+ * should not be used.<br><br>
+ *
+ * Installation/usage:<ul>
+ * <li> Declaratively inside JUL's <code>logging.properties</code>:<br>
+ * <code>handlers = org.apache.logging.log4j.jul.Log4jBridgeHandler</code><br>
+ * (and typically also: <code>org.apache.logging.log4j.jul.Log4jBridgeHandler.propagateLevels = true</code> )<br>
+ * Note: in a webapp running on Tomcat, you may create a <code>WEB-INF/classes/logging.properties</code>
+ * file to configure JUL for this webapp only: configured handlers and log levels affect your webapp only!
+ * This file is then the <i>complete</i> JUL configuration, so JUL's defaults (e.g. log level INFO) apply
+ * for stuff not explicitly defined therein.
+ * <li> Programmatically by calling <code>install()</code> method,
+ * e.g. inside ServletContextListener static-class-init. or contextInitialized()
+ * </ul>
+ * Configuration (in JUL's <code>logging.properties</code>):<ul>
+ * <li> Log4jBridgeHandler.<code>suffixToAppend</code><br>
+ * String, suffix to append to JUL logger names, to easily recognize bridged log messages.
+ * A dot "." is automatically prepended, so configuration for the basis logger is used<br>
+ * Example: <code>Log4jBridgeHandler.suffixToAppend = _JUL</code><br>
+ * Useful, for example, if you use JSF because it logs exceptions and throws them afterwards;
+ * you can easily recognize the duplicates with this (or concentrate on the non-JUL-logs).
+ * <li> Log4jBridgeHandler.<code>propagateLevels</code> boolean, "true" to automatically propagate log4j log levels to JUL.
+ * <li> Log4jBridgeHandler.<code>sysoutDebug</code> boolean, perform some (developer) debug output to sysout
+ * </ul>
+ *
+ * Log levels are translated with {@link LevelTranslator}, see also
+ * <a href="https://logging.apache.org/log4j/2.x/log4j-jul/index.html#Default_Level_Conversions">log4j doc</a>.<br><br>
+ *
+ * Restrictions:<ul>
+ * <li> Manually given source/location info in JUL (e.g. entering(), exiting(), throwing(), logp(), logrb() )
+ * will NOT be considered, i.e. gets lost in log4j logging.
+ * <li> Log levels of JUL have to be adjusted according to log4j log levels:
+ * Either by using "propagateLevels" (preferred), or manually by specifying them explicitly,
+ * i.e. logging.properties and log4j2.xml have some redundancies.
+ * <li> Only JUL log events that are allowed according to the JUL log level get to this handler and thus to log4j.
+ * This is only relevant and important if you NOT use "propagateLevels".
+ * If you set <code>.level = SEVERE</code> only error logs will be seen by this handler and thus log4j
+ * - even if the corresponding log4j log level is ALL.<br>
+ * On the other side, you should NOT set <code>.level = FINER or FINEST</code> if the log4j level is higher.
+ * In this case a lot of JUL log events would be generated, sent via this bridge to log4j and thrown away by the latter.<br>
+ * Note: JUL's default log level (i.e. none specified in logger.properties) is INFO.
+ * </ul>
+ *
+ * (Credits: idea and concept originate from org.slf4j.bridge.SLF4JBridgeHandler;
+ * level propagation idea originates from logback/LevelChangePropagator;
+ * but no source code has been copied)
+ */
+public class Log4jBridgeHandler extends java.util.logging.Handler implements PropertyChangeListener {
+ private static final org.apache.logging.log4j.Logger SLOGGER = StatusLogger.getLogger();
+
+ // the caller of the logging is java.util.logging.Logger (for location info)
+ private static final String FQCN = java.util.logging.Logger.class.getName();
+ private static final String UNKNOWN_LOGGER_NAME = "unknown.jul.logger";
+ private static final java.util.logging.Formatter julFormatter = new java.util.logging.SimpleFormatter();
+
+ private boolean doDebugOutput = false;
+ private String julSuffixToAppend = null;
+ private boolean installAsLevelPropagator = false;
+
+
+ /**
+ * Adds a new Log4jBridgeHandler instance to JUL's root logger.
+ * This is a programmatic alternative to specify
+ * <code>handlers = org.apache.logging.log4j.jul.Log4jBridgeHandler</code>
+ * and its configuration in logging.properties.<br>
+ * @param removeHandlersForRootLogger true to remove all other installed handlers on JUL root level
+ */
+ public static void install(boolean removeHandlersForRootLogger, String suffixToAppend, boolean propagateLevels) {
+ java.util.logging.Logger rootLogger = getJulRootLogger();
+ if (removeHandlersForRootLogger) {
+ for (java.util.logging.Handler hdl : rootLogger.getHandlers()) {
+ rootLogger.removeHandler(hdl);
+ }
+ }
+ rootLogger.addHandler(new Log4jBridgeHandler(false, suffixToAppend, propagateLevels));
+ // note: filter-level of Handler defaults to ALL, so nothing to do here
+ }
+
+ private static java.util.logging.Logger getJulRootLogger() {
+ return java.util.logging.LogManager.getLogManager().getLogger("");
+ }
+
+
+ /** Initialize this handler by reading out JUL configuration. */
+ public Log4jBridgeHandler() {
+ final java.util.logging.LogManager julLogMgr = java.util.logging.LogManager.getLogManager();
+ final String className = this.getClass().getName();
+ init(Boolean.parseBoolean(julLogMgr.getProperty(className + ".sysoutDebug")),
+ julLogMgr.getProperty(className + ".appendSuffix"),
+ Boolean.parseBoolean(julLogMgr.getProperty(className + ".propagateLevels")) );
+
+ }
+
+ /** Initialize this handler with given configuration. */
+ public Log4jBridgeHandler(boolean debugOutput, String suffixToAppend, boolean propagateLevels) {
+ init(debugOutput, suffixToAppend, propagateLevels);
+ }
+
+
+ /** Perform init. of this handler with given configuration (typical use is for constructor). */
+ protected void init(boolean debugOutput, String suffixToAppend, boolean propagateLevels) {
+ this.doDebugOutput = debugOutput;
+ if (debugOutput) {
+ new Exception("DIAGNOSTIC ONLY (sysout): Log4jBridgeHandler instance created (" + this + ")")
+ .printStackTrace(System.out); // is no error thus no syserr
+ }
+
+ if (suffixToAppend != null) {
+ suffixToAppend = suffixToAppend.trim(); // remove spaces
+ if (suffixToAppend.isEmpty()) {
+ suffixToAppend = null;
+ } else if (suffixToAppend.charAt(0) != '.') { // always make it a sub-logger
+ suffixToAppend = '.' + suffixToAppend;
+ }
+ }
+ this.julSuffixToAppend = suffixToAppend;
+
+ this.installAsLevelPropagator = propagateLevels;
+
+ SLOGGER.debug("Log4jBridgeHandler init. with: suffix='{}', lvlProp={}, instance={}",
+ suffixToAppend, propagateLevels, this);
+ }
+
+
+ @Override
+ public void close() {
+ // cleanup and remove listener and JUL logger references
+ julLoggerRefs = null;
+ LoggerContext.getContext(false).removePropertyChangeListener(this);
+ if (doDebugOutput) {
+ System.out.println("sysout: Log4jBridgeHandler close(): " + this);
+ }
+ }
+
+
+ @Override
+ public void publish(LogRecord record) {
+ if (record == null) { // silently ignore null records
+ return;
+ }
+
+ if (this.installAsLevelPropagator) {
+ @SuppressWarnings("resource") // no need to close the AutoCloseable ctx here
+ LoggerContext context = LoggerContext.getContext(false);
+ context.addPropertyChangeListener(this);
+ propagateLogLevels(context.getConfiguration());
Review Comment:
Makes sense to me
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