JDK8/Java8源码在线阅读
/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package java.util.logging;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.io.*;
import sun.misc.JavaLangAccess;
import sun.misc.SharedSecrets;
/**
* LogRecord objects are used to pass logging requests between
* the logging framework and individual log Handlers.
* <p>
* When a LogRecord is passed into the logging framework it
* logically belongs to the framework and should no longer be
* used or updated by the client application.
* <p>
* Note that if the client application has not specified an
* explicit source method name and source class name, then the
* LogRecord class will infer them automatically when they are
* first accessed (due to a call on getSourceMethodName or
* getSourceClassName) by analyzing the call stack. Therefore,
* if a logging Handler wants to pass off a LogRecord to another
* thread, or to transmit it over RMI, and if it wishes to subsequently
* obtain method name or class name information it should call
* one of getSourceClassName or getSourceMethodName to force
* the values to be filled in.
* <p>
* <b> Serialization notes:</b>
* <ul>
* <li>The LogRecord class is serializable.
*
* <li> Because objects in the parameters array may not be serializable,
* during serialization all objects in the parameters array are
* written as the corresponding Strings (using Object.toString).
*
* <li> The ResourceBundle is not transmitted as part of the serialized
* form, but the resource bundle name is, and the recipient object's
* readObject method will attempt to locate a suitable resource bundle.
*
* </ul>
*
* @since 1.4
*/
public class LogRecord implements java.io.Serializable {
private static final AtomicLong globalSequenceNumber
= new AtomicLong(0);
/**
* The default value of threadID will be the current thread's
* thread id, for ease of correlation, unless it is greater than
* MIN_SEQUENTIAL_THREAD_ID, in which case we try harder to keep
* our promise to keep threadIDs unique by avoiding collisions due
* to 32-bit wraparound. Unfortunately, LogRecord.getThreadID()
* returns int, while Thread.getId() returns long.
*/
private static final int MIN_SEQUENTIAL_THREAD_ID = Integer.MAX_VALUE / 2;
private static final AtomicInteger nextThreadId
= new AtomicInteger(MIN_SEQUENTIAL_THREAD_ID);
private static final ThreadLocal<Integer> threadIds = new ThreadLocal<>();
/**
* @serial Logging message level
*/
private Level level;
/**
* @serial Sequence number
*/
private long sequenceNumber;
/**
* @serial Class that issued logging call
*/
private String sourceClassName;
/**
* @serial Method that issued logging call
*/
private String sourceMethodName;
/**
* @serial Non-localized raw message text
*/
private String message;
/**
* @serial Thread ID for thread that issued logging call.
*/
private int threadID;
/**
* @serial Event time in milliseconds since 1970
*/
private long millis;
/**
* @serial The Throwable (if any) associated with log message
*/
private Throwable thrown;
/**
* @serial Name of the source Logger.
*/
private String loggerName;
/**
* @serial Resource bundle name to localized log message.
*/
private String resourceBundleName;
private transient boolean needToInferCaller;
private transient Object parameters[];
private transient ResourceBundle resourceBundle;
/**
* Returns the default value for a new LogRecord's threadID.
*/
private int defaultThreadID() {
long tid = Thread.currentThread().getId();
if (tid < MIN_SEQUENTIAL_THREAD_ID) {
return (int) tid;
} else {
Integer id = threadIds.get();
if (id == null) {
id = nextThreadId.getAndIncrement();
threadIds.set(id);
}
return id;
}
}
/**
* Construct a LogRecord with the given level and message values.
* <p>
* The sequence property will be initialized with a new unique value.
* These sequence values are allocated in increasing order within a VM.
* <p>
* The millis property will be initialized to the current time.
* <p>
* The thread ID property will be initialized with a unique ID for
* the current thread.
* <p>
* All other properties will be initialized to "null".
*
* @param level a logging level value
* @param msg the raw non-localized logging message (may be null)
*/
public LogRecord(Level level, String msg) {
// Make sure level isn't null, by calling random method.
level.getClass();
this.level = level;
message = msg;
// Assign a thread ID and a unique sequence number.
sequenceNumber = globalSequenceNumber.getAndIncrement();
threadID = defaultThreadID();
millis = System.currentTimeMillis();
needToInferCaller = true;
}
/**
* Get the source Logger's name.
*
* @return source logger name (may be null)
*/
public String getLoggerName() {
return loggerName;
}
/**
* Set the source Logger's name.
*
* @param name the source logger name (may be null)
*/
public void setLoggerName(String name) {
loggerName = name;
}
/**
* Get the localization resource bundle
* <p>
* This is the ResourceBundle that should be used to localize
* the message string before formatting it. The result may
* be null if the message is not localizable, or if no suitable
* ResourceBundle is available.
* @return the localization resource bundle
*/
public ResourceBundle getResourceBundle() {
return resourceBundle;
}
/**
* Set the localization resource bundle.
*
* @param bundle localization bundle (may be null)
*/
public void setResourceBundle(ResourceBundle bundle) {
resourceBundle = bundle;
}
/**
* Get the localization resource bundle name
* <p>
* This is the name for the ResourceBundle that should be
* used to localize the message string before formatting it.
* The result may be null if the message is not localizable.
* @return the localization resource bundle name
*/
public String getResourceBundleName() {
return resourceBundleName;
}
/**
* Set the localization resource bundle name.
*
* @param name localization bundle name (may be null)
*/
public void setResourceBundleName(String name) {
resourceBundleName = name;
}
/**
* Get the logging message level, for example Level.SEVERE.
* @return the logging message level
*/
public Level getLevel() {
return level;
}
/**
* Set the logging message level, for example Level.SEVERE.
* @param level the logging message level
*/
public void setLevel(Level level) {
if (level == null) {
throw new NullPointerException();
}
this.level = level;
}
/**
* Get the sequence number.
* <p>
* Sequence numbers are normally assigned in the LogRecord
* constructor, which assigns unique sequence numbers to
* each new LogRecord in increasing order.
* @return the sequence number
*/
public long getSequenceNumber() {
return sequenceNumber;
}
/**
* Set the sequence number.
* <p>
* Sequence numbers are normally assigned in the LogRecord constructor,
* so it should not normally be necessary to use this method.
* @param seq the sequence number
*/
public void setSequenceNumber(long seq) {
sequenceNumber = seq;
}
/**
* Get the name of the class that (allegedly) issued the logging request.
* <p>
* Note that this sourceClassName is not verified and may be spoofed.
* This information may either have been provided as part of the
* logging call, or it may have been inferred automatically by the
* logging framework. In the latter case, the information may only
* be approximate and may in fact describe an earlier call on the
* stack frame.
* <p>
* May be null if no information could be obtained.
*
* @return the source class name
*/
public String getSourceClassName() {
if (needToInferCaller) {
inferCaller();
}
return sourceClassName;
}
/**
* Set the name of the class that (allegedly) issued the logging request.
*
* @param sourceClassName the source class name (may be null)
*/
public void setSourceClassName(String sourceClassName) {
this.sourceClassName = sourceClassName;
needToInferCaller = false;
}
/**
* Get the name of the method that (allegedly) issued the logging request.
* <p>
* Note that this sourceMethodName is not verified and may be spoofed.
* This information may either have been provided as part of the
* logging call, or it may have been inferred automatically by the
* logging framework. In the latter case, the information may only
* be approximate and may in fact describe an earlier call on the
* stack frame.
* <p>
* May be null if no information could be obtained.
*
* @return the source method name
*/
public String getSourceMethodName() {
if (needToInferCaller) {
inferCaller();
}
return sourceMethodName;
}
/**
* Set the name of the method that (allegedly) issued the logging request.
*
* @param sourceMethodName the source method name (may be null)
*/
public void setSourceMethodName(String sourceMethodName) {
this.sourceMethodName = sourceMethodName;
needToInferCaller = false;
}
/**
* Get the "raw" log message, before localization or formatting.
* <p>
* May be null, which is equivalent to the empty string "".
* <p>
* This message may be either the final text or a localization key.
* <p>
* During formatting, if the source logger has a localization
* ResourceBundle and if that ResourceBundle has an entry for
* this message string, then the message string is replaced
* with the localized value.
*
* @return the raw message string
*/
public String getMessage() {
return message;
}
/**
* Set the "raw" log message, before localization or formatting.
*
* @param message the raw message string (may be null)
*/
public void setMessage(String message) {
this.message = message;
}
/**
* Get the parameters to the log message.
*
* @return the log message parameters. May be null if
* there are no parameters.
*/
public Object[] getParameters() {
return parameters;
}
/**
* Set the parameters to the log message.
*
* @param parameters the log message parameters. (may be null)
*/
public void setParameters(Object parameters[]) {
this.parameters = parameters;
}
/**
* Get an identifier for the thread where the message originated.
* <p>
* This is a thread identifier within the Java VM and may or
* may not map to any operating system ID.
*
* @return thread ID
*/
public int getThreadID() {
return threadID;
}
/**
* Set an identifier for the thread where the message originated.
* @param threadID the thread ID
*/
public void setThreadID(int threadID) {
this.threadID = threadID;
}
/**
* Get event time in milliseconds since 1970.
*
* @return event time in millis since 1970
*/
public long getMillis() {
return millis;
}
/**
* Set event time.
*
* @param millis event time in millis since 1970
*/
public void setMillis(long millis) {
this.millis = millis;
}
/**
* Get any throwable associated with the log record.
* <p>
* If the event involved an exception, this will be the
* exception object. Otherwise null.
*
* @return a throwable
*/
public Throwable getThrown() {
return thrown;
}
/**
* Set a throwable associated with the log event.
*
* @param thrown a throwable (may be null)
*/
public void setThrown(Throwable thrown) {
this.thrown = thrown;
}
private static final long serialVersionUID = 5372048053134512534L;
/**
* @serialData Default fields, followed by a two byte version number
* (major byte, followed by minor byte), followed by information on
* the log record parameter array. If there is no parameter array,
* then -1 is written. If there is a parameter array (possible of zero
* length) then the array length is written as an integer, followed
* by String values for each parameter. If a parameter is null, then
* a null String is written. Otherwise the output of Object.toString()
* is written.
*/
private void writeObject(ObjectOutputStream out) throws IOException {
// We have to call defaultWriteObject first.
out.defaultWriteObject();
// Write our version number.
out.writeByte(1);
out.writeByte(0);
if (parameters == null) {
out.writeInt(-1);
return;
}
out.writeInt(parameters.length);
// Write string values for the parameters.
for (int i = 0; i < parameters.length; i++) {
if (parameters[i] == null) {
out.writeObject(null);
} else {
out.writeObject(parameters[i].toString());
}
}
}
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException {
// We have to call defaultReadObject first.
in.defaultReadObject();
// Read version number.
byte major = in.readByte();
byte minor = in.readByte();
if (major != 1) {
throw new IOException("LogRecord: bad version: " + major + "." + minor);
}
int len = in.readInt();
if (len == -1) {
parameters = null;
} else {
parameters = new Object[len];
for (int i = 0; i < parameters.length; i++) {
parameters[i] = in.readObject();
}
}
// If necessary, try to regenerate the resource bundle.
if (resourceBundleName != null) {
try {
// use system class loader to ensure the ResourceBundle
// instance is a different instance than null loader uses
final ResourceBundle bundle =
ResourceBundle.getBundle(resourceBundleName,
Locale.getDefault(),
ClassLoader.getSystemClassLoader());
resourceBundle = bundle;
} catch (MissingResourceException ex) {
// This is not a good place to throw an exception,
// so we simply leave the resourceBundle null.
resourceBundle = null;
}
}
needToInferCaller = false;
}
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