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| java.lang.Object
 org.apache.roller.util.cache.LazyExpiringCacheEntry
| LazyExpiringCacheEntry | | public class LazyExpiringCacheEntry implements Serializable(Code) | | A cache entry that is meant to expire in a lazy fashion.
The way to use this class is to wrap the object you want to cache in an
instance of this class and store that in your cache. Then when you want
to retrieve this entry you must input a last-expired time which can be
compared against the time this entry was cached to determine if the cached
entry is "fresh". If the object is not fresh then we don't return it.
This essentially allows us to track when an object is cached and then before
we can retrieve that cached object we must compare it with it's last known
invalidation time to make sure it hasn't expired. This is useful because
instead of actively purging lots of cached objects from the cache at
invalidation time, we can now be lazy and just invalidate them when we
actually try to retrieve the cached object.
This is useful for Roller because we will no longer have to iterate through
the list of cached objects and inspect the keys to figure out what items to
invalidate. Instead we can just sit back and let the items be invalidated as
we try to use them.
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| Method Summary | |
| public long | getTimeCached()
| | public Object | getValue(long lastInvalidated)
Retrieve the value of this cache entry if it is still "fresh". | | public boolean | isInvalid(long lastInvalidated)
Determine if this cache entry has expired. |
| LazyExpiringCacheEntry | | public LazyExpiringCacheEntry(Object item)(Code) | | |
| getTimeCached | | public long getTimeCached()(Code) | | |
| getValue | | public Object getValue(long lastInvalidated)(Code) | | Retrieve the value of this cache entry if it is still "fresh".
If the value has expired then we return null.
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| isInvalid | | public boolean isInvalid(long lastInvalidated)(Code) | | Determine if this cache entry has expired.
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