remm 01/11/16 01:44:55
Added: catalina/src/share/org/apache/catalina/util
FastHttpDateFormat.java
Log:
- Centralize HTTP date formats generation (because date formatting is a very
expensive operation),
similar to what FastDateFormat does, but a lot more specialized.
Revision Changes Path
1.1
jakarta-tomcat-4.0/catalina/src/share/org/apache/catalina/util/FastHttpDateFormat.java
Index: FastHttpDateFormat.java
===================================================================
/*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.catalina.util;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.TimeZone;
import java.text.SimpleDateFormat;
/**
* Utility class to generate HTTP dates.
*
* @author Remy Maucherat
*/
public final class FastHttpDateFormat {
// -------------------------------------------------------------- Variables
/**
* HTTP date format.
*/
protected static SimpleDateFormat format =
new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
protected final static TimeZone gmtZone = TimeZone.getTimeZone("GMT");
/**
* GMT timezone - all HTTP dates are on GMT
*/
static {
format.setTimeZone(gmtZone);
}
/**
* Instant on which the currentDate object was generated.
*/
protected static long currentDateGenerated = 0L;
/**
* Current formatted date.
*/
protected static String currentDate = null;
/**
* Date cache.
*/
protected static HashMap dateCache = new HashMap();
// --------------------------------------------------------- Public Methods
/**
* Get the current date in HTTP format.
*/
public static String getCurrentDate() {
long now = System.currentTimeMillis();
if ((now - currentDateGenerated) > 1000) {
synchronized (format) {
if ((now - currentDateGenerated) > 1000) {
currentDateGenerated = now;
currentDate = format.format(new Date(now));
}
}
}
return currentDate;
}
/**
* Get the HTTP format of the specified date.
*/
public static String getDate(Date date) {
String cachedDate = (String) dateCache.get(date);
if (cachedDate != null)
return cachedDate;
String newDate = null;
synchronized (format) {
newDate = format.format(date);
dateCache.put(date, newDate);
}
return newDate;
}
}
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