com.sun.mail.util.logging.CollectorFormatter Maven / Gradle / Ivy
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* Copyright (c) 2013-2015 Jason Mehrens. All rights reserved.
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package com.sun.mail.util.logging;
import static com.sun.mail.util.logging.LogManagerProperties.fromLogManager;
import java.lang.reflect.UndeclaredThrowableException;
import java.text.MessageFormat;
import java.util.Comparator;
import java.util.Locale;
import java.util.ResourceBundle;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.LogRecord;
/**
* A LogRecord formatter that takes a sequence of LogRecords and combines them
* into a single summary result. Formating of the head, LogRecord, and tail are
* delegated to the wrapped formatter.
*
*
* By default each CollectorFormatter is initialized using the
* following LogManager configuration properties where
* <formatter-name> refers to the fully qualified class name or
* the fully qualified derived class name of the formatter. If properties are
* not defined, or contain invalid values, then the specified default values are
* used.
*
* - <formatter-name>.comparator name of a
* {@linkplain java.util.Comparator} class used to choose the collected
* LogRecord. If a comparator is specified then the max
* LogRecord is chosen. If comparator is set to the string literal
* null, then the last record is chosen. (defaults to
* {@linkplain SeverityComparator})
*
*
- <formatter-name>.comparator.reverse a boolean
* true to collect the min LogRecord or false to
* collect the max LogRecord. (defaults to false)
*
*
- <formatter-name>.format the
* {@linkplain java.text.MessageFormat MessageFormat} string used to format the
* collected summary statistics. The arguments are explained in detail in the
* {@linkplain #getTail(java.util.logging.Handler) getTail} documentation.
* (defaults to {0}{1}{2}{4,choice,-1#|0#|0<... {4,number,integer}
* more}\n)
*
*
- <formatter-name>.formatter name of a Formatter class used
* to format the collected LogRecord. (defaults to {@linkplain CompactFormatter})
*
*
*
* @author Jason Mehrens
* @since JavaMail 1.5.2
*/
public class CollectorFormatter extends Formatter {
/**
* Avoid depending on JMX runtime bean to get the start time.
*/
private static final long INIT_TIME = System.currentTimeMillis();
/**
* The message format string used as the formatted output.
*/
private final String fmt;
/**
* The formatter used to format the chosen log record.
*/
private final Formatter formatter;
/**
* The comparator used to pick the log record to format.
*/
private final Comparator comparator;
/**
* The last accepted record. Synchronized access is preferred over volatile
* for this class.
*/
private LogRecord last;
/**
* The number of log records that have been formatted.
*/
private long count;
/**
* The number of log produced containing at least one log record.
* Only incremented when this formatter is reset.
*/
private long generation = 1L;
/**
* The number of log records that have been formatted with a thrown object.
*/
private long thrown;
/**
* The eldest log record time or eldest time possible for this instance.
*/
private long minMillis = INIT_TIME;
/**
* The newest log record time.
*/
private long maxMillis = Long.MIN_VALUE;
/**
* Creates the formatter using the LogManager defaults.
*
* @throws SecurityException if a security manager exists and the caller
* does not have LoggingPermission("control").
* @throws UndeclaredThrowableException if there are problems loading from
* the LogManager.
*/
public CollectorFormatter() {
final String p = getClass().getName();
this.fmt = initFormat(p);
this.formatter = initFormatter(p);
this.comparator = initComparator(p);
}
/**
* Creates the formatter using the given format.
*
* @param format the message format or null to use the LogManager default.
* @throws SecurityException if a security manager exists and the caller
* does not have LoggingPermission("control").
* @throws UndeclaredThrowableException if there are problems loading from
* the LogManager.
*/
public CollectorFormatter(String format) {
final String p = getClass().getName();
this.fmt = format == null ? initFormat(p) : format;
this.formatter = initFormatter(p);
this.comparator = initComparator(p);
}
/**
* Creates the formatter using the given values.
*
* @param format the format string or null to use the LogManager default.
* @param f the formatter used on the collected log record or null to
* specify no formatter.
* @param c the comparator used to determine which log record to format or
* null to specify no comparator.
* @throws SecurityException if a security manager exists and the caller
* does not have LoggingPermission("control").
* @throws UndeclaredThrowableException if there are problems loading from
* the LogManager.
*/
public CollectorFormatter(String format, Formatter f,
Comparator c) {
final String p = getClass().getName();
this.fmt = format == null ? initFormat(p) : format;
this.formatter = f;
this.comparator = c;
}
/**
* Accumulates log records which will be used to produce the final output.
* The output is generated using the {@link #getTail} method which also
* resets this formatter back to its original state.
*
* @param record the record to store.
* @return an empty string.
* @throws NullPointerException if the given record is null.
*/
@Override
public String format(final LogRecord record) {
if (record == null) {
throw new NullPointerException();
}
boolean accepted;
do {
final LogRecord peek = peek();
//The self compare of the first record acts like a type check.
LogRecord update = apply(peek != null ? peek : record, record);
if (peek != update) { //Not identical.
update.getSourceMethodName(); //Infer caller, null check.
accepted = acceptAndUpdate(peek, update);
} else {
accepted = accept(peek, record);
}
} while (!accepted);
return "";
}
/**
* Formats the collected LogRecord and summary statistics. The collected
* results are reset after calling this method. The
* {@linkplain java.text.MessageFormat java.text} argument indexes are assigned
* to the following properties:
*
*
* - {@code head} the
* {@linkplain Formatter#getHead(java.util.logging.Handler) head} string
* returned from the target formatter and
* {@linkplain #finish(java.lang.String) finished} by this formatter.
*
- {@code formatted} the current log record
* {@linkplain Formatter#format(java.util.logging.LogRecord) formatted} by
* the target formatter and {@linkplain #finish(java.lang.String) finished}
* by this formatter. If the formatter is null then record is formatted by
* this {@linkplain #formatMessage(java.util.logging.LogRecord) formatter}.
*
- {@code tail} the
* {@linkplain Formatter#getTail(java.util.logging.Handler) tail} string
* returned from the target formatter and
* {@linkplain #finish(java.lang.String) finished} by this formatter.
*
- {@code count} the total number of log records
* {@linkplain #format consumed} by this formatter.
*
- {@code remaining} the count minus one.
*
- {@code thrown} the total number of log records
* {@linkplain #format consumed} by this formatter with an assigned
* {@linkplain java.util.logging.LogRecord#getThrown throwable}.
*
- {@code normal messages} the count minus the thrown.
*
- {@code minMillis} the eldest log record
* {@linkplain java.util.logging.LogRecord#getMillis event time}
* {@linkplain #format consumed} by this formatter. If the count is zero
* then this is set to the previous max or approximate start time if there
* was no previous max. By default this parameter is defined as a number.
* The format type and format style rules from the
* {@linkplain java.text.MessageFormat} should be used to convert this from
* milliseconds to a date or time.
*
- {@code maxMillis} the most recent log record
* {@linkplain java.util.logging.LogRecord#getMillis event time}
* {@linkplain #format consumed} by this formatter. If the count is zero
* then this is set to the {@linkplain System#currentTimeMillis() current time}.
* By default this parameter is defined as a number. The format type and
* format style rules from the {@linkplain java.text.MessageFormat} should be
* used to convert this from milliseconds to a date or time.
*
- {@code elapsed} the elapsed time in milliseconds between the
* {@code maxMillis} and {@code minMillis}.
*
- {@code startTime} the approximate start time in milliseconds. By
* default this parameter is defined as a number. The format type and format
* style rules from the {@linkplain java.text.MessageFormat} should be used to
* convert this from milliseconds to a date or time.
*
- {@code currentTime} the
* {@linkplain System#currentTimeMillis() current time} in milliseconds. By
* default this parameter is defined as a number. The format type and format
* style rules from the {@linkplain java.text.MessageFormat} should be used to
* convert this from milliseconds to a date or time.
*
- {@code uptime} the elapsed time in milliseconds between the
* {@code currentTime} and {@code startTime}.
*
- {@code generation} the number times this method produced output with
* at least one {@linkplain #format consumed} log record. This can be used
* to track the number of complete reports this formatter has produced.
*
*
*
* Some example formats:
*
* - {@code com.sun.mail.util.logging.CollectorFormatter.format={0}{1}{2}{4,choice,-1#|0#|0<... {4,number,integer} more}\n}
*
* This prints the head ({@code {0}}), format ({@code {1}}), and tail
* ({@code {2}}) from the target formatter followed by the number of
* remaining ({@code {4}}) log records consumed by this formatter if there
* are any remaining records.
*
* Encoding failed.|NullPointerException: null String.getBytes(:913)... 3 more
*
* - {@code com.sun.mail.util.logging.CollectorFormatter.format=These {3} messages occurred between\n{7,date,EEE, MMM dd HH:mm:ss:S ZZZ yyyy} and {8,time,EEE, MMM dd HH:mm:ss:S ZZZ yyyy}\n}
*
* This prints the count ({@code {3}}) followed by the date and time of the
* eldest log record ({@code {7}}) and the date and time of the most recent
* log record ({@code {8}}).
*
* These 292 messages occurred between
* Tue, Jul 21 14:11:42:449 -0500 2009 and Fri, Nov 20 07:29:24:0 -0600 2009
*
* - {@code com.sun.mail.util.logging.CollectorFormatter.format=These {3} messages occurred between {9,choice,86400000#{7,date} {7,time} and {8,time}|86400000<{7,date} and {8,date}}\n}
*
* This prints the count ({@code {3}}) and then chooses the format based on
* the elapsed time ({@code {9}}). If the elapsed time is less than one day
* then the eldest log record ({@code {7}}) date and time is formatted
* followed by just the time of the most recent log record ({@code {8}}.
* Otherwise, the just the date of the eldest log record ({@code {7}}) and
* just the date of most recent log record ({@code {8}} is formatted.
*
* These 73 messages occurred between Jul 21, 2009 2:11:42 PM and 2:13:32 PM
*
* These 116 messages occurred between Jul 21, 2009 and Aug 20, 2009
*
* - {@code com.sun.mail.util.logging.CollectorFormatter.format={13} alert reports since {10,date}.\n}
*
* This prints the generation ({@code {13}}) followed by the start time
* ({@code {10}}) formatted as a date.
*
* 4,320 alert reports since Jul 21, 2012.
*
*
*
* @param h the handler or null.
* @return the output string.
*/
@Override
public String getTail(final Handler h) {
super.getTail(h); //Be forward compatible with super.getHead.
return formatRecord(h, true);
}
/**
* Formats the collected LogRecord and summary statistics. The LogRecord and
* summary statistics are not changed by calling this method.
*
* @return the current record formatted or the default toString.
* @see #getTail(java.util.logging.Handler)
*/
@Override
public String toString() {
String result;
try {
result = formatRecord((Handler) null, false);
} catch (final RuntimeException ignore) {
result = super.toString();
}
return result;
}
/**
* Used to choose the collected LogRecord. This implementation returns the
* greater of two LogRecords.
*
* @param t the current record.
* @param u the record that could replace the current.
* @return the greater of the given log records.
* @throws NullPointerException may occur if either record is null.
*/
protected LogRecord apply(final LogRecord t, final LogRecord u) {
if (t == null || u == null) {
throw new NullPointerException();
}
if (comparator != null) {
return comparator.compare(t, u) >= 0 ? t : u;
} else {
return u;
}
}
/**
* Updates the summary statistics only if the expected record matches the
* last record. The update record is not stored.
*
* @param e the LogRecord that is expected.
* @param u the LogRecord used to collect statistics.
* @return true if the last record was the expected record.
* @throws NullPointerException if the update record is null.
*/
private synchronized boolean accept(final LogRecord e, final LogRecord u) {
/**
* LogRecord methods must be called before the check of the last stored
* record to guard against subclasses of LogRecord that might attempt to
* reset the state by triggering a call to getTail.
*/
final long millis = u.getMillis(); //Null check.
final Throwable ex = u.getThrown();
if (last == e) { //Only if the exact same reference.
if (++count != 1L) {
minMillis = Math.min(minMillis, millis);
} else { //Show single records as instant and not a time period.
minMillis = millis;
}
maxMillis = Math.max(maxMillis, millis);
if (ex != null) {
++thrown;
}
return true;
} else {
return false;
}
}
/**
* Resets all of the collected summary statistics including the LogRecord.
* @param min the current min milliseconds.
*/
private synchronized void reset(final long min) {
if (last != null) {
last = null;
++generation;
}
count = 0L;
thrown = 0L;
minMillis = min;
maxMillis = Long.MIN_VALUE;
}
/**
* Formats the given record with the head and tail.
*
* @param h the Handler or null.
* @param reset true if the summary statistics and LogRecord should be reset
* back to initial values.
* @return the formatted string.
* @see #getTail(java.util.logging.Handler)
*/
private String formatRecord(final Handler h, final boolean reset) {
final LogRecord record;
final long c;
final long t;
final long g;
long msl;
long msh;
long now;
synchronized (this) {
record = last;
c = count;
g = generation;
t = thrown;
msl = minMillis;
msh = maxMillis;
now = System.currentTimeMillis();
if (c == 0L) {
msh = now;
}
if (reset) { //BUG ID 6351685
reset(msh);
}
}
final String head;
final String msg;
final String tail;
final Formatter f = this.formatter;
if (f != null) {
synchronized (f) {
head = f.getHead(h);
msg = record != null ? f.format(record) : "";
tail = f.getTail(h);
}
} else {
head = "";
msg = record != null ? formatMessage(record) : "";
tail = "";
}
Locale l = null;
if (record != null) {
ResourceBundle rb = record.getResourceBundle();
l = rb == null ? null : rb.getLocale();
}
final MessageFormat mf;
if (l == null) { //BUG ID 8039165
mf = new MessageFormat(fmt);
} else {
mf = new MessageFormat(fmt, l);
}
/**
* These arguments are described in the getTail documentation.
*/
return mf.format(new Object[]{finish(head), finish(msg), finish(tail),
c, (c - 1L), t, (c - t), msl, msh, (msh - msl), INIT_TIME, now,
(now - INIT_TIME), g});
}
/**
* Applied to the head, format, and tail returned by the target formatter.
* This implementation trims all input strings.
*
* @param s the string to transform.
* @return the transformed string.
* @throws NullPointerException if the given string is null.
*/
protected String finish(String s) {
return s.trim();
}
/**
* Peek at the current log record.
*
* @return null or the current log record.
*/
private synchronized LogRecord peek() {
return this.last;
}
/**
* Updates the summary statistics and stores given LogRecord if the expected
* record matches the current record.
*
* @param e the expected record.
* @param u the update record.
* @return true if the update was performed.
* @throws NullPointerException if the update record is null.
*/
private synchronized boolean acceptAndUpdate(LogRecord e, LogRecord u) {
if (accept(e, u)) {
this.last = u;
return true;
} else {
return false;
}
}
/**
* Gets the message format string from the LogManager or creates the default
* message format string.
*
* @param p the class name prefix.
* @return the format string.
* @throws NullPointerException if the given argument is null.
*/
private String initFormat(final String p) {
String v = fromLogManager(p.concat(".format"));
if (v == null || v.length() == 0) {
v = "{0}{1}{2}{4,choice,-1#|0#|0<... {4,number,integer} more}\n";
}
return v;
}
/**
* Gets and creates the formatter from the LogManager or creates the default
* formatter.
*
* @param p the class name prefix.
* @return the formatter.
* @throws NullPointerException if the given argument is null.
* @throws UndeclaredThrowableException if the formatter can not be created.
*/
private Formatter initFormatter(final String p) {
Formatter f;
String v = fromLogManager(p.concat(".formatter"));
if (v != null && v.length() != 0) {
if (!"null".equalsIgnoreCase(v)) {
try {
f = LogManagerProperties.newFormatter(v);
} catch (final RuntimeException re) {
throw re;
} catch (final Exception e) {
throw new UndeclaredThrowableException(e);
}
} else {
f = null;
}
} else {
//Don't force the byte code verifier to load the formatter.
f = Formatter.class.cast(new CompactFormatter());
}
return f;
}
/**
* Gets and creates the comparator from the LogManager or returns the
* default comparator.
*
* @param p the class name prefix.
* @return the comparator or null.
* @throws IllegalArgumentException if it was specified that the comparator
* should be reversed but no initial comparator was specified.
* @throws NullPointerException if the given argument is null.
* @throws UndeclaredThrowableException if the comparator can not be
* created.
*/
@SuppressWarnings("unchecked")
private Comparator initComparator(final String p) {
Comparator c;
final String name = fromLogManager(p.concat(".comparator"));
final String reverse = fromLogManager(p.concat(".comparator.reverse"));
try {
if (name != null && name.length() != 0) {
if (!"null".equalsIgnoreCase(name)) {
c = LogManagerProperties.newComparator(name);
if (Boolean.parseBoolean(reverse)) {
assert c != null;
c = LogManagerProperties.reverseOrder(c);
}
} else {
if (reverse != null) {
throw new IllegalArgumentException(
"No comparator to reverse.");
} else {
c = null; //No ordering.
}
}
} else {
if (reverse != null) {
throw new IllegalArgumentException(
"No comparator to reverse.");
} else {
//Don't force the byte code verifier to load the comparator.
c = Comparator.class.cast(SeverityComparator.getInstance());
}
}
} catch (final RuntimeException re) {
throw re; //Avoid catch all.
} catch (final Exception e) {
throw new UndeclaredThrowableException(e);
}
return c;
}
}