Examples of org.apache.roller.weblogger.util.cache.LazyExpiringCacheEntry

Package org.apache.roller.weblogger.util.cache

Examples of org.apache.roller.weblogger.util.cache.LazyExpiringCacheEntry

org.apache.roller.weblogger.util.cache.LazyExpiringCacheEntry
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.

        if(!cacheEnabled)
            return null;
        
        Object entry = null;
        
        LazyExpiringCacheEntry lazyEntry =
                (LazyExpiringCacheEntry) this.contentCache.get(key);
        if(lazyEntry != null) {
            entry = lazyEntry.getValue(lastModified);
            
            if(entry != null) {
                log.debug("HIT "+key);
            } else {
                log.debug("HIT-EXPIRED "+key);

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    public void put(String key, Object value) {
        
        if(!cacheEnabled)
            return;
        
        contentCache.put(key, new LazyExpiringCacheEntry(value));
        log.debug("PUT "+key);
    }

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        if(!cacheEnabled)
            return null;
        
        Object entry = null;
        
        LazyExpiringCacheEntry lazyEntry =
                (LazyExpiringCacheEntry) this.contentCache.get(key);
        if(lazyEntry != null) {
            entry = lazyEntry.getValue(lastModified);
            
            if(entry != null) {
                log.debug("HIT "+key);
            } else {
                log.debug("HIT-EXPIRED "+key);

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    public void put(String key, Object value) {
        
        if(!cacheEnabled)
            return;
        
        contentCache.put(key, new LazyExpiringCacheEntry(value));
        log.debug("PUT "+key);
    }

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        if(!cacheEnabled)
            return null;
        
        Object entry = null;
        
        LazyExpiringCacheEntry lazyEntry =
                (LazyExpiringCacheEntry) this.contentCache.get(key);
        if(lazyEntry != null) {
            entry = lazyEntry.getValue(lastModified);
            
            if(entry != null) {
                log.debug("HIT "+key);
            } else {
                log.debug("HIT-EXPIRED "+key);

View Full Code Here

    public void put(String key, Object value) {
        
        if(!cacheEnabled)
            return;
        
        contentCache.put(key, new LazyExpiringCacheEntry(value));
        log.debug("PUT "+key);
    }

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