com.cloudbees.syslog.util.ConcurrentDateFormat Maven / Gradle / Ivy
/**
* Copyright 2010-2016 OrientDB LTD (http://orientdb.com)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
*
*
http://www.apache.org/licenses/LICENSE-2.0
*
*
Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing permissions and
* limitations under the License.
*
*
For more information: http://www.orientdb.com
*/
package com.cloudbees.syslog.util;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingDeque;
/**
* Thread safe date formatter.
*
* @author Cyrille Le Clerc
*/
public class ConcurrentDateFormat {
private final BlockingQueue dateFormats;
private final String pattern;
private final Locale locale;
private final TimeZone timeZone;
/**
* Note: This constructor may not support all locales. For full coverage, use the factory
* methods in the {@link java.text.DateFormat} class.
*
* @param pattern the pattern describing the date and time pattern
* @param locale the locale whose date pattern symbols should be used
* @param timeZone the timezone used by the underlying calendar
* @param maxCacheSize
* @throws NullPointerException if the given pattern or locale is null
* @throws IllegalArgumentException if the given pattern is invalid
*/
public ConcurrentDateFormat(String pattern, Locale locale, TimeZone timeZone, int maxCacheSize) {
this.dateFormats = new LinkedBlockingDeque(maxCacheSize);
this.pattern = pattern;
this.locale = locale;
this.timeZone = timeZone;
}
/**
* Formats a Date into a date/time string.
*
* @param date the time value to be formatted into a time string.
* @return the formatted time string.
*/
public String format(Date date) {
SimpleDateFormat dateFormat = dateFormats.poll();
if (dateFormat == null) {
dateFormat = new SimpleDateFormat(pattern, locale);
dateFormat.setTimeZone(timeZone);
}
try {
return dateFormat.format(date);
} finally {
dateFormats.offer(dateFormat);
}
}
@Override
public String toString() {
return "ConcurrentDateFormat[pattern=" + pattern + "]";
}
}