/*
|
* The contents of this file are subject to the terms of the Common Development and
|
* Distribution License (the License). You may not use this file except in compliance with the
|
* License.
|
*
|
* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
|
* specific language governing permission and limitations under the License.
|
*
|
* When distributing Covered Software, include this CDDL Header Notice in each file and include
|
* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
|
* Header, with the fields enclosed by brackets [] replaced by your own identifying
|
* information: "Portions Copyright [year] [name of copyright owner]".
|
*
|
* Copyright 2006-2009 Sun Microsystems, Inc.
|
* Portions Copyright 2011-2015 ForgeRock AS.
|
*/
|
package org.opends.server.util;
|
|
import java.text.SimpleDateFormat;
|
import java.util.Calendar;
|
import java.util.Date;
|
import java.util.GregorianCalendar;
|
import java.util.List;
|
import java.util.Map;
|
import java.util.TimeZone;
|
import java.util.concurrent.ConcurrentHashMap;
|
import java.util.concurrent.CopyOnWriteArrayList;
|
import java.util.concurrent.Executors;
|
import java.util.concurrent.ScheduledExecutorService;
|
import java.util.concurrent.ThreadFactory;
|
import java.util.concurrent.TimeUnit;
|
|
import org.opends.server.api.DirectoryThread;
|
import org.forgerock.i18n.slf4j.LocalizedLogger;
|
import org.opends.server.schema.GeneralizedTimeSyntax;
|
|
/**
|
* This class provides an application-wide timing service. It provides
|
* the ability to retrieve the current time in various different formats
|
* and resolutions.
|
*/
|
@org.opends.server.types.PublicAPI(
|
stability = org.opends.server.types.StabilityLevel.UNCOMMITTED,
|
mayInstantiate = false,
|
mayExtend = false,
|
mayInvoke = true)
|
public final class TimeThread
|
{
|
|
/**
|
* Timer job.
|
*/
|
private static final class TimeInfo implements Runnable
|
{
|
|
/** The calendar holding the current time. */
|
private GregorianCalendar calendar;
|
|
/** The date for this time thread. */
|
private Date date;
|
|
/** The timestamp for this time thread in the generalized time format. */
|
private String generalizedTime;
|
|
/** The timestamp for this time thread in GMT. */
|
private String gmtTimestamp;
|
|
/** The date formatter that will be used to obtain the GMT timestamp. */
|
private final SimpleDateFormat gmtTimestampFormatter;
|
|
/** The current time in HHmm form as an integer. */
|
private int hourAndMinute;
|
|
/** The timestamp for this time thread in the local time zone. */
|
private String localTimestamp;
|
|
/** The date formatter that will be used to obtain the local timestamp. */
|
private final SimpleDateFormat localTimestampFormatter;
|
|
/** The current time in nanoseconds. */
|
private volatile long nanoTime;
|
|
/** The current time in milliseconds since the epoch. */
|
private volatile long time;
|
|
/**
|
* A set of arbitrary formatters that should be maintained by this time
|
* thread.
|
*/
|
private final List<SimpleDateFormat> userDefinedFormatters;
|
|
/**
|
* A set of arbitrary formatted times, mapped from format string to the
|
* corresponding formatted time representation.
|
*/
|
private final Map<String, String> userDefinedTimeStrings;
|
|
|
|
/**
|
* Create a new job with the specified delay.
|
*/
|
public TimeInfo()
|
{
|
userDefinedFormatters = new CopyOnWriteArrayList<>();
|
userDefinedTimeStrings = new ConcurrentHashMap<>();
|
|
TimeZone utcTimeZone = TimeZone.getTimeZone("UTC");
|
|
gmtTimestampFormatter = new SimpleDateFormat("yyyyMMddHHmmss'Z'");
|
gmtTimestampFormatter.setTimeZone(utcTimeZone);
|
|
localTimestampFormatter =
|
new SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss Z");
|
|
// Populate initial values.
|
run();
|
}
|
|
|
|
/** {@inheritDoc} */
|
@Override
|
public void run()
|
{
|
try
|
{
|
calendar = new GregorianCalendar();
|
date = calendar.getTime();
|
time = date.getTime();
|
nanoTime = System.nanoTime();
|
generalizedTime = GeneralizedTimeSyntax.format(date);
|
localTimestamp = localTimestampFormatter.format(date);
|
gmtTimestamp = gmtTimestampFormatter.format(date);
|
hourAndMinute =
|
calendar.get(Calendar.HOUR_OF_DAY) * 100
|
+ calendar.get(Calendar.MINUTE);
|
|
for (SimpleDateFormat format : userDefinedFormatters)
|
{
|
userDefinedTimeStrings.put(format.toPattern(), format.format(date));
|
}
|
}
|
catch (Exception e)
|
{
|
logger.traceException(e);
|
}
|
}
|
}
|
|
/**
|
* Thread factory used by the scheduled execution service.
|
*/
|
private static final class TimeThreadFactory implements
|
ThreadFactory
|
{
|
|
/** {@inheritDoc} */
|
@Override
|
public Thread newThread(Runnable r)
|
{
|
Thread t = new DirectoryThread(r, "Time Thread");
|
t.setDaemon(true);
|
return t;
|
}
|
|
}
|
|
|
|
/** The singleton instance. */
|
private static TimeThread INSTANCE = new TimeThread();
|
|
/** The tracer object for the debug logger. */
|
private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
|
|
|
|
/**
|
* Retrieves a <CODE>Calendar</CODE> containing the time at the last
|
* update.
|
*
|
* @return A <CODE>Calendar</CODE> containing the time at the last
|
* update.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static Calendar getCalendar() throws IllegalStateException
|
{
|
checkState();
|
return INSTANCE.timeInfo.calendar;
|
}
|
|
|
|
/**
|
* Retrieves a <CODE>Date</CODE> containing the time at the last
|
* update.
|
*
|
* @return A <CODE>Date</CODE> containing the time at the last update.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static Date getDate() throws IllegalStateException
|
{
|
checkState();
|
return INSTANCE.timeInfo.date;
|
}
|
|
|
|
/**
|
* Retrieves a string containing a normalized representation of the
|
* current time in a generalized time format. The timestamp will look
|
* like "20050101000000.000Z".
|
*
|
* @return A string containing a normalized representation of the
|
* current time in a generalized time format.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static String getGeneralizedTime() throws IllegalStateException
|
{
|
checkState();
|
return INSTANCE.timeInfo.generalizedTime;
|
}
|
|
|
|
/**
|
* Retrieves a string containing the current time in GMT. The
|
* timestamp will look like "20050101000000Z".
|
*
|
* @return A string containing the current time in GMT.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static String getGMTTime() throws IllegalStateException
|
{
|
checkState();
|
return INSTANCE.timeInfo.gmtTimestamp;
|
}
|
|
|
|
/**
|
* Retrieves an integer containing the time in HHmm format at the last
|
* update. It will be calculated as "(hourOfDay*100) + minuteOfHour".
|
*
|
* @return An integer containing the time in HHmm format at the last
|
* update.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static int getHourAndMinute() throws IllegalStateException
|
{
|
checkState();
|
return INSTANCE.timeInfo.hourAndMinute;
|
}
|
|
|
|
/**
|
* Retrieves a string containing the current time in the local time
|
* zone. The timestamp format will look like
|
* "01/Jan/2005:00:00:00 -0600".
|
*
|
* @return A string containing the current time in the local time
|
* zone.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static String getLocalTime() throws IllegalStateException
|
{
|
checkState();
|
return INSTANCE.timeInfo.localTimestamp;
|
}
|
|
|
|
/**
|
* Retrieves the time in nanoseconds from the most precise available system
|
* timer. The value returned represents nanoseconds since some fixed but
|
* arbitrary time.
|
*
|
* @return The time in nanoseconds from some fixed but arbitrary time.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static long getNanoTime() throws IllegalStateException
|
{
|
checkState();
|
return INSTANCE.timeInfo.nanoTime;
|
}
|
|
|
|
/**
|
* Retrieves the time in milliseconds since the epoch at the last
|
* update.
|
*
|
* @return The time in milliseconds since the epoch at the last
|
* update.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static long getTime() throws IllegalStateException
|
{
|
checkState();
|
return INSTANCE.timeInfo.time;
|
}
|
|
|
|
/**
|
* Retrieves the current time formatted using the given format string.
|
* <p>
|
* The first time this method is used with a given format string, it
|
* will be used to create a formatter that will generate the time
|
* string. That formatter will then be put into a list so that it will
|
* be maintained automatically for future use.
|
*
|
* @param formatString
|
* The string that defines the format of the time string to
|
* retrieve.
|
* @return The formatted time string.
|
* @throws IllegalArgumentException
|
* If the provided format string is invalid.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static String getUserDefinedTime(String formatString)
|
throws IllegalArgumentException, IllegalStateException
|
{
|
checkState();
|
|
String timeString =
|
INSTANCE.timeInfo.userDefinedTimeStrings.get(formatString);
|
|
if (timeString == null)
|
{
|
SimpleDateFormat formatter = new SimpleDateFormat(formatString);
|
timeString = formatter.format(INSTANCE.timeInfo.date);
|
INSTANCE.timeInfo.userDefinedTimeStrings.put(formatString,
|
timeString);
|
INSTANCE.timeInfo.userDefinedFormatters.add(formatter);
|
}
|
|
return timeString;
|
}
|
|
|
|
/**
|
* Removes the user-defined time formatter from this time thread so
|
* that it will no longer be maintained. This is a safe operation
|
* because if the same format string is used for multiple purposes
|
* then it will be added back the next time a time is requested with
|
* the given format.
|
*
|
* @param formatString
|
* The format string for the date formatter to remove.
|
* @throws IllegalStateException
|
* If the time service has not been started.
|
*/
|
public static void removeUserDefinedFormatter(String formatString)
|
throws IllegalStateException
|
{
|
checkState();
|
|
INSTANCE.timeInfo.userDefinedFormatters.remove(new SimpleDateFormat(
|
formatString));
|
INSTANCE.timeInfo.userDefinedTimeStrings.remove(formatString);
|
}
|
|
|
|
/**
|
* Starts the time service if it has not already been started.
|
*/
|
public static void start()
|
{
|
if (INSTANCE == null)
|
{
|
INSTANCE = new TimeThread();
|
}
|
}
|
|
|
|
/**
|
* Stops the time service if it has not already been stopped.
|
*/
|
public static void stop()
|
{
|
if (INSTANCE != null)
|
{
|
INSTANCE.scheduler.shutdown();
|
INSTANCE = null;
|
}
|
}
|
|
|
|
/** Ensures that the time service has been started. */
|
private static void checkState() throws IllegalStateException
|
{
|
if (INSTANCE == null)
|
{
|
throw new IllegalStateException("Time service not started");
|
}
|
}
|
|
|
|
/** The scheduler. */
|
private final ScheduledExecutorService scheduler =
|
Executors.newSingleThreadScheduledExecutor(new TimeThreadFactory());
|
|
/** The current time information. */
|
private final TimeInfo timeInfo = new TimeInfo();
|
|
|
|
/**
|
* Creates a new instance of this time service and starts it.
|
*/
|
private TimeThread()
|
{
|
this.scheduler.scheduleWithFixedDelay(timeInfo, 0, 200,
|
TimeUnit.MILLISECONDS);
|
}
|
}
|
