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*
* The Universal Permissive License (UPL), Version 1.0
*
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* person obtaining a copy of this software, associated documentation and/or
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*
* (a) the Software, and
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* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
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*
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package com.oracle.truffle.api;
import java.io.Closeable;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Supplier;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import org.graalvm.polyglot.Context;
/**
* Support for logging in Truffle languages and instruments.
*
* The logger's {@link Level} configuration is done using the
* {@link org.graalvm.polyglot.Context.Builder#options(java.util.Map) Context's options}. The level
* option key has the following format: {@code log.languageId.className.level} or
* {@code log.instrumentId.className.level}. The value is either the name of pre-defined
* {@link Level} constant or a numeric {@link Level} value. If not explicitly set in
* {@link org.graalvm.polyglot.Context.Builder#options(java.util.Map) Context's options} the level
* is inherited from the parent logger.
*
* The {@link TruffleLogger} supports {@link LogRecord#getParameters() message parameters} of
* primitive types and strings. The object parameters are converted into string value before they
* are passed to the {@link Handler}.
*
* The {@link TruffleLogger} instances are safe to be used on compiled code paths as well as from
* multiple-threads.
*
* @since 19.0
*/
public final class TruffleLogger {
private static final String ROOT_NAME = "";
private static final int MAX_CLEANED_REFS = 100;
private static final int OFF_VALUE = Level.OFF.intValue();
private static final int DEFAULT_VALUE = Level.INFO.intValue();
private static final ReferenceQueue loggersRefQueue = new ReferenceQueue<>();
private static final Object childrenLock = new Object();
private final String name;
private final LoggerCache loggerCache;
@CompilerDirectives.CompilationFinal private volatile int levelNum;
@CompilerDirectives.CompilationFinal private volatile Assumption levelNumStable;
private volatile Level levelObj;
private volatile TruffleLogger parent;
private Collection children;
private TruffleLogger(final String loggerName, final LoggerCache loggerCache) {
this.name = loggerName;
this.loggerCache = loggerCache;
this.levelNum = DEFAULT_VALUE;
this.levelNumStable = Truffle.getRuntime().createAssumption("Log Level Value stable for: " + loggerName);
}
private TruffleLogger(LoggerCache loggerCache) {
this(ROOT_NAME, loggerCache);
}
/**
* Find or create a root logger for a given language or instrument. If the root logger for given
* language or instrument already exists it's returned, otherwise a new root logger is created.
*
* @param id the unique id of language or instrument
* @return a {@link TruffleLogger}
* @throws NullPointerException if {@code id} is null
* @throws IllegalArgumentException if {@code id} is not a valid language or instrument id.
* @since 19.0
*/
public static TruffleLogger getLogger(final String id) {
return getLogger(id, null, LoggerCache.getInstance());
}
/**
* Find or create a logger for a given language or instrument class. If a logger for the class
* already exists it's returned, otherwise a new logger is created.
*
* @param id the unique id of language or instrument
* @param forClass the {@link Class} to create a logger for
* @return a {@link TruffleLogger}
* @throws NullPointerException if {@code id} or {@code forClass} is null
* @throws IllegalArgumentException if {@code id} is not a valid language or instrument id.
* @since 19.0
*/
public static TruffleLogger getLogger(final String id, final Class forClass) {
Objects.requireNonNull(forClass, "Class must be non null.");
return getLogger(id, forClass.getName());
}
/**
* Find or create a logger for a given language or instrument. If a logger with given name
* already exists it's returned, otherwise a new logger is created.
*
* @param id the unique id of language or instrument
* @param loggerName the the name of a {@link TruffleLogger}, if a {@code loggerName} is null or
* empty a root logger for language or instrument is returned
* @return a {@link TruffleLogger}
* @throws NullPointerException if {@code id} is null
* @throws IllegalArgumentException if {@code id} is not a valid language or instrument id.
* @since 19.0
*/
public static TruffleLogger getLogger(final String id, final String loggerName) {
return getLogger(id, loggerName, LoggerCache.getInstance());
}
static TruffleLogger getLogger(String id, String loggerName, LoggerCache loggerCache) {
Objects.requireNonNull(id, "LanguageId must be non null.");
return loggerCache.getOrCreateLogger(id, loggerName);
}
LoggerCache getLoggerCache() {
return this.loggerCache;
}
/**
* Logs a message with {@link Level#CONFIG config level}.
*
* If the logger is enabled for the {@link Level#CONFIG config level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param message the message to log
* @since 19.0
*/
public void config(final String message) {
log(Level.CONFIG, message);
}
/**
* Logs a message with {@link Level#CONFIG config level}. The message is constructed only when
* the logger is enabled for the {@link Level#CONFIG config level}.
*
* If the logger is enabled for the {@link Level#CONFIG config level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void config(final Supplier messageSupplier) {
log(Level.CONFIG, messageSupplier);
}
/**
* Logs entry into method.
*
* This method can be used to log entry into a method. A {@link LogRecord} with message "ENTRY"
* and the given {@code sourceMethod} and {@code sourceClass} is logged with {@link Level#FINER
* finer level}.
*
* @param sourceClass the entered class
* @param sourceMethod the entered method
* @since 19.0
*/
public void entering(final String sourceClass, final String sourceMethod) {
logp(Level.FINER, sourceClass, sourceMethod, "ENTRY");
}
/**
* Logs entry into method with single parameter.
*
* This method can be used to log entry into a method. A {@link LogRecord} with message "ENTRY",
* the given {@code sourceMethod} and {@code sourceClass} and given parameter is logged with
* {@link Level#FINER finer level}.
*
* @param sourceClass the entered class
* @param sourceMethod the entered method
* @param parameter the method parameter
* @since 19.0
*/
public void entering(final String sourceClass, final String sourceMethod, final Object parameter) {
logp(Level.FINER, sourceClass, sourceMethod, "ENTRY {0}", parameter);
}
/**
* Logs entry into method with multiple parameters.
*
* This method can be used to log entry into a method. A {@link LogRecord} with message "ENTRY",
* the given {@code sourceMethod} and {@code sourceClass} and given parameters is logged with
* {@link Level#FINER finer level}.
*
* @param sourceClass the entered class
* @param sourceMethod the entered method
* @param parameters the method parameters
* @since 19.0
*/
public void entering(final String sourceClass, final String sourceMethod, final Object[] parameters) {
String msg = "ENTRY";
if (parameters == null) {
logp(Level.FINER, sourceClass, sourceMethod, msg);
return;
}
if (!isLoggable(Level.FINER)) {
return;
}
for (int i = 0; i < parameters.length; i++) {
msg = msg + " {" + i + "}";
}
logp(Level.FINER, sourceClass, sourceMethod, msg, parameters);
}
/**
* Logs a return from method.
*
* This method can be used to log return from a method. A {@link LogRecord} with message
* "RETURN" and the given {@code sourceMethod} and {@code sourceClass} is logged with
* {@link Level#FINER finer level}.
*
* @param sourceClass the exiting class
* @param sourceMethod the exiting method
* @since 19.0
*/
public void exiting(final String sourceClass, final String sourceMethod) {
logp(Level.FINER, sourceClass, sourceMethod, "RETURN");
}
/**
* Logs a return from method with result.
*
* This method can be used to log return from a method. A {@link LogRecord} with message
* "RETURN", the given {@code sourceMethod} and {@code sourceClass} and method result is logged
* with {@link Level#FINER finer level}.
*
* @param sourceClass the exiting class
* @param sourceMethod the exiting method
* @param result the return value
* @since 19.0
*/
public void exiting(final String sourceClass, final String sourceMethod, final Object result) {
logp(Level.FINER, sourceClass, sourceMethod, "RETURN {0}", result);
}
/**
* Logs a message with {@link Level#FINE fine level}.
*
* If the logger is enabled for the {@link Level#FINE fine level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param message the message to log
* @since 19.0
*/
public void fine(final String message) {
log(Level.FINE, message);
}
/**
* Logs a message with {@link Level#FINE fine level}. The message is constructed only when the
* logger is enabled for the {@link Level#FINE fine level}.
*
* If the logger is enabled for the {@link Level#FINE fine level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void fine(final Supplier messageSupplier) {
log(Level.FINE, messageSupplier);
}
/**
* Logs a message with {@link Level#FINER finer level}.
*
* If the logger is enabled for the {@link Level#FINER finer level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param message the message to log
* @since 19.0
*/
public void finer(final String message) {
log(Level.FINER, message);
}
/**
* Logs a message with {@link Level#FINER finer level}. The message is constructed only when the
* logger is enabled for the {@link Level#FINER finer level}.
*
* If the logger is enabled for the {@link Level#FINER finer level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void finer(final Supplier messageSupplier) {
log(Level.FINER, messageSupplier);
}
/**
* Logs a message with {@link Level#FINEST finest level}.
*
* If the logger is enabled for the {@link Level#FINEST finest level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param message the message to log
* @since 19.0
*/
public void finest(final String message) {
log(Level.FINEST, message);
}
/**
* Logs a message with {@link Level#FINEST finest level}. The message is constructed only when
* the logger is enabled for the {@link Level#FINEST finest level}.
*
* If the logger is enabled for the {@link Level#FINEST finest level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void finest(final Supplier messageSupplier) {
log(Level.FINEST, messageSupplier);
}
/**
* Logs a message with {@link Level#INFO info level}.
*
* If the logger is enabled for the {@link Level#INFO info level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param message the message to log
* @since 19.0
*/
public void info(final String message) {
log(Level.INFO, message);
}
/**
* Logs a message with {@link Level#INFO info level}. The message is constructed only when the
* logger is enabled for the {@link Level#INFO info level}.
*
* If the logger is enabled for the {@link Level#INFO info level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void info(final Supplier messageSupplier) {
log(Level.INFO, messageSupplier);
}
/**
* Logs a message with {@link Level#SEVERE severe level}.
*
* If the logger is enabled for the {@link Level#SEVERE severe level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param message the message to log
* @since 19.0
*/
public void severe(final String message) {
log(Level.SEVERE, message);
}
/**
* Logs a message with {@link Level#SEVERE severe level}. The message is constructed only when
* the logger is enabled for the {@link Level#SEVERE severe level}.
*
* If the logger is enabled for the {@link Level#SEVERE severe level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void severe(final Supplier messageSupplier) {
log(Level.SEVERE, messageSupplier);
}
/**
* Logs throwing an exception.
*
* This method can be used to log exception thrown from a method. A {@link LogRecord} with
* message "THROW",the given {@code sourceMethod} and {@code sourceClass} and {@code thrown} is
* logged with {@link Level#FINER finer level}.
*
* @param sourceClass the class throwing an exception
* @param sourceMethod the method throwing an exception
* @param thrown the thrown exception
* @since 19.0
*/
public T throwing(final String sourceClass, final String sourceMethod, final T thrown) {
logp(Level.FINER, sourceClass, sourceMethod, "THROW", thrown);
return thrown;
}
/**
* Logs a message with {@link Level#WARNING warning level}.
*
* If the logger is enabled for the {@link Level#WARNING warning level} the message is sent to
* the {@link Handler} registered in the current {@link Context}.
*
* @param message the message to log
* @since 19.0
*/
public void warning(final String message) {
log(Level.WARNING, message);
}
/**
* Logs a message with {@link Level#WARNING warning level}. The message is constructed only when
* the logger is enabled for the {@link Level#WARNING warning level}.
*
* If the logger is enabled for the {@link Level#WARNING warning level} the message is sent to
* the {@link Handler} registered in the current {@link Context}.
*
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void warning(final Supplier messageSupplier) {
log(Level.WARNING, messageSupplier);
}
/**
* Logs a message.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param message the message to log
* @since 19.0
*/
public void log(final Level level, final String message) {
if (!isLoggable(level)) {
return;
}
doLog(level, message, null, null, (Object) null);
}
/**
* Logs a message. The message is constructed only when the logger is enabled for the given
* {@code level}.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void log(final Level level, final Supplier messageSupplier) {
if (!isLoggable(level)) {
return;
}
doLog(level, messageSupplier, null, null, (Object) null);
}
/**
* Logs a message with single parameter.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param message the message to log
* @param parameter the log message parameter
* @since 19.0
*/
public void log(final Level level, final String message, final Object parameter) {
if (!isLoggable(level)) {
return;
}
doLog(level, message, null, null, parameter);
}
/**
* Logs a message with multiple parameters.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param message the message to log
* @param parameters the log message parameters
* @since 19.0
*/
public void log(final Level level, final String message, final Object[] parameters) {
if (!isLoggable(level)) {
return;
}
doLog(level, message, null, null, parameters);
}
/**
* Logs a message with an exception.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param message the message to log
* @param thrown the exception to log
* @since 19.0
*/
public void log(final Level level, final String message, final Throwable thrown) {
if (!isLoggable(level)) {
return;
}
doLog(level, message, null, null, thrown);
}
/**
* Logs a message with an exception. The message is constructed only when the logger is enabled
* for the given {@code level}.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param thrown the exception to log
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void log(final Level level, final Throwable thrown, final Supplier messageSupplier) {
if (!isLoggable(level)) {
return;
}
doLog(level, messageSupplier, null, null, thrown);
}
/**
* Logs a message, specifying source class and source method.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param sourceClass the class issued the logging request
* @param sourceMethod the method issued the logging request
* @param message the message to log
* @since 19.0
*/
public void logp(final Level level, final String sourceClass, final String sourceMethod, final String message) {
if (!isLoggable(level)) {
return;
}
doLog(level, message, sourceClass, sourceMethod, (Object) null);
}
/**
* Logs a message, specifying source class and source method. The message is constructed only
* when the logger is enabled for the given {@code level}.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param sourceClass the class issued the logging request
* @param sourceMethod the method issued the logging request
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void logp(final Level level, final String sourceClass, final String sourceMethod, final Supplier messageSupplier) {
if (!isLoggable(level)) {
return;
}
doLog(level, messageSupplier, sourceClass, sourceMethod, (Object) null);
}
/**
* Logs a message with single parameter, specifying source class and source method.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param sourceClass the class issued the logging request
* @param sourceMethod the method issued the logging request
* @param message the message to log
* @param parameter the log message parameter
* @since 19.0
*/
public void logp(final Level level, final String sourceClass, final String sourceMethod, final String message, final Object parameter) {
if (!isLoggable(level)) {
return;
}
doLog(level, message, sourceClass, sourceMethod, parameter);
}
/**
* Log a message with multiple parameters, specifying source class and source method.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param sourceClass the class issued the logging request
* @param sourceMethod the method issued the logging request
* @param message the message to log
* @param parameters the log message parameters
* @since 19.0
*/
public void logp(final Level level, final String sourceClass, final String sourceMethod, final String message, Object[] parameters) {
if (!isLoggable(level)) {
return;
}
doLog(level, message, sourceClass, sourceMethod, parameters);
}
/**
* Logs a message with an exception, specifying source class and source method.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param sourceClass the class issued the logging request
* @param sourceMethod the method issued the logging request
* @param message the message to log
* @param thrown the exception to log
* @since 19.0
*/
public void logp(final Level level, final String sourceClass, final String sourceMethod, final String message, final Throwable thrown) {
if (!isLoggable(level)) {
return;
}
doLog(level, message, sourceClass, sourceMethod, thrown);
}
/**
* Logs a message with an exception, specifying source class and source method. The message is
* constructed only when the logger is enabled for the given {@code level}.
*
* If the logger is enabled for the given {@code level} the message is sent to the
* {@link Handler} registered in the current {@link Context}.
*
* @param level the required {@link Level}
* @param sourceClass the class issued the logging request
* @param sourceMethod the method issued the logging request
* @param thrown the exception to log
* @param messageSupplier the {@link Supplier} called to produce the message to log
* @since 19.0
*/
public void logp(final Level level, final String sourceClass, final String sourceMethod, final Throwable thrown, final Supplier messageSupplier) {
if (!isLoggable(level)) {
return;
}
doLog(level, messageSupplier, sourceClass, sourceMethod, thrown);
}
/**
* Returns the name of the logger.
*
* @return the logger name
* @since 19.0
*/
public String getName() {
return name;
}
/**
* Returns the parent {@link TruffleLogger}.
*
* @return the parent {@link TruffleLogger} or null when the {@link TruffleLogger} has no
* parent.
* @since 19.0
*/
public TruffleLogger getParent() {
return parent;
}
/**
* Checks if a message of the given level would be logged by this logger.
*
* @param level the required logging level
* @return true if message is loggable by this logger
* @since 19.0
*/
public boolean isLoggable(final Level level) {
int value = getLevelNum();
if (level.intValue() < value || value == OFF_VALUE) {
return false;
}
return isLoggableSlowPath(level);
}
@CompilerDirectives.TruffleBoundary
private boolean isLoggableSlowPath(final Level level) {
return loggerCache.isLoggable(getName(), level);
}
@CompilerDirectives.TruffleBoundary
private void doLog(
final Level level,
final String message,
final String className,
final String methodName,
final Object param) {
doLog(level, message, className, methodName, new Object[]{param});
}
@CompilerDirectives.TruffleBoundary
private void doLog(
final Level level,
final String message,
final String className,
final String methodName,
final Object[] params) {
final LogRecord logRecord = LanguageAccessor.engineAccess().createLogRecord(
loggerCache.getSPI(),
level,
getName(),
message,
className,
methodName,
params,
null);
callHandlers(logRecord);
}
@CompilerDirectives.TruffleBoundary
private void doLog(
final Level level,
final String message,
final String className,
final String methodName,
final Throwable thrown) {
final LogRecord logRecord = LanguageAccessor.engineAccess().createLogRecord(
loggerCache.getSPI(),
level,
getName(),
message,
className,
methodName,
null,
thrown);
callHandlers(logRecord);
}
@CompilerDirectives.TruffleBoundary
private void doLog(
final Level level,
final Supplier messageSupplier,
final String className,
final String methodName,
final Object param) {
doLog(level, messageSupplier.get(), className, methodName, new Object[]{param});
}
@CompilerDirectives.TruffleBoundary
private void doLog(
final Level level,
final Supplier messageSupplier,
final String className,
final String methodName,
final Throwable thrown) {
doLog(level, messageSupplier.get(), className, methodName, thrown);
}
private void callHandlers(final LogRecord record) {
CompilerAsserts.neverPartOfCompilation("Log handler should never be called from compiled code.");
for (TruffleLogger current = this; current != null; current = current.getParent()) {
if (current == loggerCache.polyglotRootLogger) {
LanguageAccessor.engineAccess().getLogHandler(loggerCache.getSPI()).publish(record);
}
}
}
private void removeChild(final ChildLoggerRef child) {
synchronized (childrenLock) {
if (children != null) {
for (Iterator it = children.iterator(); it.hasNext();) {
if (it.next() == child) {
it.remove();
return;
}
}
}
}
}
private void updateLevelNum(boolean singleContext) {
int value;
if (levelObj != null) {
value = levelObj.intValue();
if (parent != null && !singleContext) {
value = Math.min(value, parent.getLevelNum());
}
} else if (parent != null) {
value = parent.getLevelNum();
} else {
value = DEFAULT_VALUE;
}
setLevelNum(value);
if (children != null) {
for (ChildLoggerRef ref : children) {
final TruffleLogger logger = ref.get();
if (logger != null) {
logger.updateLevelNum(singleContext);
}
}
}
}
private int getLevelNum() {
if (!levelNumStable.isValid()) {
CompilerDirectives.transferToInterpreterAndInvalidate();
}
return levelNum;
}
private boolean setLevelNum(final int value) {
if (this.levelNum != value) {
this.levelNum = value;
final Assumption currentAssumtion = levelNumStable;
levelNumStable = Truffle.getRuntime().createAssumption("Log Level Value stable for: " + getName());
currentAssumtion.invalidate();
return true;
}
return false;
}
private void setLevel(final Level level, final boolean singleContext) {
synchronized (childrenLock) {
this.levelObj = level;
updateLevelNum(singleContext);
}
}
private void setParent(final TruffleLogger newParent, final boolean singleContext) {
Objects.requireNonNull(newParent, "Parent must be non null.");
synchronized (childrenLock) {
ChildLoggerRef found = null;
if (parent != null) {
for (Iterator it = parent.children.iterator(); it.hasNext();) {
final ChildLoggerRef childRef = it.next();
final TruffleLogger childLogger = childRef.get();
if (childLogger == this) {
found = childRef;
it.remove();
break;
}
}
}
this.parent = newParent;
if (found == null) {
found = new ChildLoggerRef(this);
}
found.setParent(parent);
if (parent.children == null) {
parent.children = new ArrayList<>(2);
}
parent.children.add(found);
updateLevelNum(singleContext);
}
}
private static void cleanupFreedReferences() {
for (int i = 0; i < MAX_CLEANED_REFS; i++) {
final AbstractLoggerRef ref = (AbstractLoggerRef) loggersRefQueue.poll();
if (ref == null) {
break;
}
ref.close();
}
}
private abstract static class AbstractLoggerRef extends WeakReference implements Closeable {
private final AtomicBoolean closed;
AbstractLoggerRef(final TruffleLogger logger) {
super(logger, loggersRefQueue);
this.closed = new AtomicBoolean();
}
@Override
public abstract void close();
boolean shouldClose() {
return !closed.getAndSet(true);
}
}
private static final class ChildLoggerRef extends AbstractLoggerRef {
private volatile Reference parent;
ChildLoggerRef(final TruffleLogger logger) {
super(logger);
}
void setParent(TruffleLogger parent) {
this.parent = new WeakReference<>(parent);
}
@Override
public void close() {
if (shouldClose()) {
final Reference p = parent;
if (p != null) {
TruffleLogger parentLogger = p.get();
if (parentLogger != null) {
parentLogger.removeChild(this);
}
parent = null;
}
}
}
}
static final class LoggerCache {
private static final ReferenceQueue