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package com.sun.appserv.web.taglibs.cache;
/**
* Class responsible for caching and expiring the execution result of a JSP
* fragment.
*/
public class CacheEntry
{
public static final int NO_TIMEOUT = -1;
String content;
volatile long expireTime;
/**
* Constructs a CacheEntry using the response string to be
* cached and the timeout after which the entry will expire
*/
public CacheEntry(String response, int timeout) {
content = response;
computeExpireTime(timeout);
}
/**
* set the real expire time
* @param expireTime in milli seconds
*/
public void setExpireTime(long expireTime) {
this.expireTime = expireTime;
}
/**
* Gets the cached content.
*
* @return The cached content
*/
public String getContent() {
return this.content;
}
/**
* compute when this entry to be expired based on timeout relative to
* current time.
* @param timeout in seconds
*/
public void computeExpireTime(int timeout) {
// timeout is relative to current time
this.expireTime = (timeout == NO_TIMEOUT) ? timeout :
System.currentTimeMillis() + (timeout * 1000L);
}
/**
* is this response still valid?
*/
public boolean isValid() {
return (expireTime > System.currentTimeMillis() ||
expireTime == NO_TIMEOUT);
}
/**
* clear the contents
*/
public void clear() {
content = null;
expireTime = 0L;
}
}