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⏎ jdk/internal/logger/LazyLoggers.java
/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package jdk.internal.logger;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.function.BiFunction;
import java.lang.System.LoggerFinder;
import java.lang.System.Logger;
import java.lang.ref.WeakReference;
import java.util.Objects;
import jdk.internal.misc.VM;
import sun.util.logging.PlatformLogger;
/**
* This class is a factory for Lazy Loggers; only system loggers can be
* Lazy Loggers.
*/
public final class LazyLoggers {
static final RuntimePermission LOGGERFINDER_PERMISSION =
new RuntimePermission("loggerFinder");
private LazyLoggers() {
throw new InternalError();
}
/**
* This class is used to hold the factories that a Lazy Logger will use
* to create (or map) its wrapped logger.
* @param <L> {@link Logger} or a subclass of {@link Logger}.
*/
private static final class LazyLoggerFactories<L extends Logger> {
/**
* A factory method to create an SPI logger.
* Usually, this will be something like LazyLoggers::getSystemLogger.
*/
final BiFunction<String, Module, L> loggerSupplier;
public LazyLoggerFactories(BiFunction<String, Module, L> loggerSupplier) {
this(Objects.requireNonNull(loggerSupplier),
(Void)null);
}
private LazyLoggerFactories(BiFunction<String, Module, L> loggerSupplier,
Void unused) {
this.loggerSupplier = loggerSupplier;
}
}
static interface LoggerAccessor {
/**
* The logger name.
* @return The name of the logger that is / will be lazily created.
*/
public String getLoggerName();
/**
* Returns the wrapped logger object.
* @return the wrapped logger object.
*/
public Logger wrapped();
/**
* A PlatformLogger.Bridge view of the wrapped logger object.
* @return A PlatformLogger.Bridge view of the wrapped logger object.
*/
public PlatformLogger.Bridge platform();
}
/**
* The LazyLoggerAccessor class holds all the logic that delays the creation
* of the SPI logger until such a time that the VM is booted and the logger
* is actually used for logging.
*
* This class uses the services of the BootstrapLogger class to instantiate
* temporary loggers if appropriate.
*/
static final class LazyLoggerAccessor implements LoggerAccessor {
// The factories that will be used to create the logger lazyly
final LazyLoggerFactories<? extends Logger> factories;
// We need to pass the actual caller module when creating the logger.
private final WeakReference<Module> moduleRef;
// The name of the logger that will be created lazyly
final String name;
// The plain logger SPI object - null until it is accessed for the
// first time.
private volatile Logger w;
// A PlatformLogger.Bridge view of w.
private volatile PlatformLogger.Bridge p;
private LazyLoggerAccessor(String name,
LazyLoggerFactories<? extends Logger> factories,
Module module) {
this(Objects.requireNonNull(name), Objects.requireNonNull(factories),
Objects.requireNonNull(module), null);
}
private LazyLoggerAccessor(String name,
LazyLoggerFactories<? extends Logger> factories,
Module module, Void unused) {
this.name = name;
this.factories = factories;
this.moduleRef = new WeakReference<>(module);
}
/**
* The logger name.
* @return The name of the logger that is / will be lazily created.
*/
@Override
public String getLoggerName() {
return name;
}
// must be called in synchronized block
// set wrapped logger if not set
private void setWrappedIfNotSet(Logger wrapped) {
if (w == null) {
w = wrapped;
}
}
/**
* Returns the logger SPI object, creating it if 'w' is still null.
* @return the logger SPI object.
*/
public Logger wrapped() {
Logger wrapped = w;
if (wrapped != null) return wrapped;
// Wrapped logger not created yet: create it.
// BootstrapLogger has the logic to decide whether to invoke the
// SPI or use a temporary (BootstrapLogger or SimpleConsoleLogger)
// logger.
wrapped = BootstrapLogger.getLogger(this);
synchronized(this) {
// if w has already been in between, simply drop 'wrapped'.
setWrappedIfNotSet(wrapped);
return w;
}
}
/**
* A PlatformLogger.Bridge view of the wrapped logger.
* @return A PlatformLogger.Bridge view of the wrapped logger.
*/
public PlatformLogger.Bridge platform() {
// We can afford to return the platform view of the previous
// logger - if that view is not null.
// Because that view will either be the BootstrapLogger, which
// will redirect to the new wrapper properly, or the temporary
// logger - which in effect is equivalent to logging something
// just before the application initialized LogManager.
PlatformLogger.Bridge platform = p;
if (platform != null) return platform;
synchronized (this) {
if (w != null) {
if (p == null) p = PlatformLogger.Bridge.convert(w);
return p;
}
}
// If we reach here it means that the wrapped logger may not
// have been created yet: attempt to create it.
// BootstrapLogger has the logic to decide whether to invoke the
// SPI or use a temporary (BootstrapLogger or SimpleConsoleLogger)
// logger.
final Logger wrapped = BootstrapLogger.getLogger(this);
synchronized(this) {
// if w has already been set, simply drop 'wrapped'.
setWrappedIfNotSet(wrapped);
if (p == null) p = PlatformLogger.Bridge.convert(w);
return p;
}
}
/**
* Makes this accessor release a temporary logger.
* This method is called
* by BootstrapLogger when JUL is the default backend and LogManager
* is initialized, in order to replace temporary SimpleConsoleLoggers by
* real JUL loggers. See BootstrapLogger for more details.
* If {@code replace} is {@code true}, then this method will force
* the accessor to eagerly recreate its wrapped logger.
* Note: passing {@code replace=false} is no guarantee that the
* method will not actually replace the released logger.
* @param temporary The temporary logger too be released.
* @param replace Whether the released logger should be eagerly
* replaced.
*/
void release(SimpleConsoleLogger temporary, boolean replace) {
PlatformLogger.ConfigurableBridge.LoggerConfiguration conf =
PlatformLogger.ConfigurableBridge.getLoggerConfiguration(temporary);
PlatformLogger.Level level = conf != null
? conf.getPlatformLevel()
: null;
synchronized (this) {
if (this.w == temporary) {
this.w = null; this.p = null;
}
}
PlatformLogger.Bridge platform = replace || level != null
? this.platform() : null;
if (level != null) {
conf = (platform != null && platform != temporary)
? PlatformLogger.ConfigurableBridge.getLoggerConfiguration(platform)
: null;
if (conf != null) conf.setPlatformLevel(level);
}
}
/**
* Replace 'w' by the real SPI logger and flush the log messages pending
* in the temporary 'bootstrap' Logger. Called by BootstrapLogger when
* this accessor's bootstrap logger is accessed and BootstrapLogger
* notices that the VM is no longer booting.
* @param bootstrap This accessor's bootstrap logger (usually this is 'w').
*/
Logger getConcreteLogger(BootstrapLogger bootstrap) {
assert VM.isBooted();
synchronized(this) {
// another thread may have already invoked flush()
if (this.w == bootstrap) {
this.w = null; this.p = null;
}
}
return this.wrapped();
}
PlatformLogger.Bridge getConcretePlatformLogger(BootstrapLogger bootstrap) {
assert VM.isBooted();
synchronized(this) {
// another thread may have already invoked flush()
if (this.w == bootstrap) {
this.w = null; this.p = null;
}
}
return this.platform();
}
// Creates the wrapped logger by invoking the SPI.
Logger createLogger() {
final Module module = moduleRef.get();
if (module == null) {
throw new IllegalStateException("The module for which this logger"
+ " was created has been garbage collected");
}
return this.factories.loggerSupplier.apply(name, module);
}
/**
* Creates a new lazy logger accessor for the named logger. The given
* factories will be use when it becomes necessary to actually create
* the logger.
* @param <T> An interface that extends {@link Logger}.
* @param name The logger name.
* @param factories The factories that should be used to create the
* wrapped logger.
* @return A new LazyLoggerAccessor.
*/
public static LazyLoggerAccessor makeAccessor(String name,
LazyLoggerFactories<? extends Logger> factories, Module module) {
return new LazyLoggerAccessor(name, factories, module);
}
}
/**
* An implementation of {@link Logger} that redirects all calls to a wrapped
* instance of {@code Logger}.
*/
private static class LazyLoggerWrapper
extends AbstractLoggerWrapper<Logger> {
final LoggerAccessor loggerAccessor;
public LazyLoggerWrapper(LazyLoggerAccessor loggerSinkSupplier) {
this(Objects.requireNonNull(loggerSinkSupplier), (Void)null);
}
private LazyLoggerWrapper(LazyLoggerAccessor loggerSinkSupplier,
Void unused) {
this.loggerAccessor = loggerSinkSupplier;
}
@Override
final Logger wrapped() {
return loggerAccessor.wrapped();
}
@Override
PlatformLogger.Bridge platformProxy() {
return loggerAccessor.platform();
}
}
// Do not expose this outside of this package.
private static volatile LoggerFinder provider;
private static LoggerFinder accessLoggerFinder() {
LoggerFinder prov = provider;
if (prov == null) {
// no need to lock: it doesn't matter if we call
// getLoggerFinder() twice - since LoggerFinder already caches
// the result.
// This is just an optimization to avoid the cost of calling
// doPrivileged every time.
final SecurityManager sm = System.getSecurityManager();
prov = sm == null ? LoggerFinder.getLoggerFinder() :
AccessController.doPrivileged(
(PrivilegedAction<LoggerFinder>)LoggerFinder::getLoggerFinder);
provider = prov;
}
return prov;
}
// Avoid using lambda here as lazy loggers could be created early
// in the bootstrap sequence...
private static final BiFunction<String, Module, Logger> loggerSupplier =
new BiFunction<>() {
@Override
public Logger apply(String name, Module module) {
return LazyLoggers.getLoggerFromFinder(name, module);
}
};
private static final LazyLoggerFactories<Logger> factories =
new LazyLoggerFactories<>(loggerSupplier);
// A concrete implementation of Logger that delegates to a System.Logger,
// but only creates the System.Logger instance lazily when it's used for
// the first time.
// The JdkLazyLogger uses a LazyLoggerAccessor objects, which relies
// on the logic embedded in BootstrapLogger to avoid loading the concrete
// logger provider until the VM has finished booting.
//
private static final class JdkLazyLogger extends LazyLoggerWrapper {
JdkLazyLogger(String name, Module module) {
this(LazyLoggerAccessor.makeAccessor(name, factories, module),
(Void)null);
}
private JdkLazyLogger(LazyLoggerAccessor holder, Void unused) {
super(holder);
}
}
/**
* Gets a logger from the LoggerFinder. Creates the actual concrete
* logger.
* @param name name of the logger
* @param module module on behalf of which the logger is created
* @return The logger returned by the LoggerFinder.
*/
static Logger getLoggerFromFinder(String name, Module module) {
final SecurityManager sm = System.getSecurityManager();
if (sm == null) {
return accessLoggerFinder().getLogger(name, module);
} else {
return AccessController.doPrivileged((PrivilegedAction<Logger>)
() -> {return accessLoggerFinder().getLogger(name, module);},
null, LOGGERFINDER_PERMISSION);
}
}
/**
* Returns a (possibly lazy) Logger for the caller.
*
* @param name the logger name
* @param module The module on behalf of which the logger is created.
* If the module is not loaded from the Boot ClassLoader,
* the LoggerFinder is accessed and the logger returned
* by {@link LoggerFinder#getLogger(java.lang.String, java.lang.Module)}
* is returned to the caller directly.
* Otherwise, the logger returned by
* {@link #getLazyLogger(java.lang.String, java.lang.Module)}
* is returned to the caller.
*
* @return a (possibly lazy) Logger instance.
*/
public static final Logger getLogger(String name, Module module) {
if (DefaultLoggerFinder.isSystem(module)) {
return getLazyLogger(name, module);
} else {
return getLoggerFromFinder(name, module);
}
}
/**
* Returns a (possibly lazy) Logger suitable for system classes.
* Whether the returned logger is lazy or not depend on the result
* returned by {@link BootstrapLogger#useLazyLoggers()}.
*
* @param name the logger name
* @param module the module on behalf of which the logger is created.
* @return a (possibly lazy) Logger instance.
*/
public static final Logger getLazyLogger(String name, Module module) {
// BootstrapLogger has the logic to determine whether a LazyLogger
// should be used. Usually, it is worth it only if:
// - the VM is not yet booted
// - or, the backend is JUL and there is no configuration
// - or, the backend is a custom backend, as we don't know what
// that is going to load...
// So if for instance the VM is booted and we use JUL with a custom
// configuration, we're not going to delay the creation of loggers...
final boolean useLazyLogger = BootstrapLogger.useLazyLoggers();
if (useLazyLogger) {
return new JdkLazyLogger(name, module);
} else {
// Directly invoke the LoggerFinder.
return getLoggerFromFinder(name, module);
}
}
}
⏎ jdk/internal/logger/LazyLoggers.java
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File name: java.base-11.0.1-src.zip File size: 8740354 bytes Release date: 2018-11-04 Download
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