Examples of com.google.common.cache.CacheStats

com.google.common.cache.CacheStats
Statistics about the performance of a {@link Cache}. Instances of this class are immutable.
Cache statistics are incremented according to the following rules:
- When a cache lookup encounters an existing cache entry {@code hitCount} is incremented.
- When a cache lookup first encounters a missing cache entry, a new entry is created.
  - After successful creation {@code missCount} and {@code createSuccessCount} areincremented, and the total creation time, in nanoseconds, is added to {@code totalCreateTime}.
  - When an exception is thrown during creation {@code missCount} and {@code createExceptionCount} are incremented, and the total creation time, in nanoseconds, isadded to {@code totalCreateTime}.
  - Cache lookups that encounter a missing cache entry that is pending creation will await creation (whether successful or not) and then increment {@code missCount}.
- When an entry is evicted from the cache, {@code evictionCount} is incremented.
- No stats are modified when a cache entry is invalidated or manually removed.
- No stats are modified by operations invoked on the {@linkplain Cache#asMap asMap} view ofthe cache.
@author Charles Fry @since Guava release 10

            loadSuccessCount += s.loadSuccessCount;
            loadExceptionCount += s.loadExceptionCount;
            totalLoadTime += s.totalLoadTime;
            evictionCount += s.evictionCount;
        }
        CacheStats stats = new CacheStats(hitCount, missCount, loadSuccessCount, 
                loadExceptionCount, totalLoadTime, evictionCount);
        return stats;
    }

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    }


    private void displayCacheStatistics(Cache<StatementCacheKey, PreparedStatement> dynamicPSCache) {


        long cacheSize = dynamicPSCache.size();
        CacheStats cacheStats = dynamicPSCache.stats();


        log.info("Total LRU cache size {}", cacheSize);
        if (cacheSize > (maxLRUCacheSize * 0.8)) {
            log.warn("Warning, the LRU prepared statements cache is over 80% full");
        }


        if (log.isDebugEnabled()) {
            log.debug("Cache statistics :");
            log.debug("\t\t- hits count : {}", cacheStats.hitCount());
            log.debug("\t\t- hits rate : {}", cacheStats.hitRate());
            log.debug("\t\t- miss count : {}", cacheStats.missCount());
            log.debug("\t\t- miss rate : {}", cacheStats.missRate());
            log.debug("\t\t- eviction count : {}", cacheStats.evictionCount());
            log.debug("\t\t- load count : {}", cacheStats.loadCount());
            log.debug("\t\t- load success count : {}", cacheStats.loadSuccessCount());
            log.debug("\t\t- load exception count : {}", cacheStats.loadExceptionCount());
            log.debug("\t\t- total load time : {}", cacheStats.totalLoadTime());
            log.debug("\t\t- average load penalty : {}", cacheStats.averageLoadPenalty());
            log.debug("");
            log.debug("");
        }
    }

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            loadSuccessCount += s.loadSuccessCount;
            loadExceptionCount += s.loadExceptionCount;
            totalLoadTime += s.totalLoadTime;
            evictionCount += s.evictionCount;
        }
        CacheStats stats = new CacheStats(hitCount, missCount, loadSuccessCount, 
                loadExceptionCount, totalLoadTime, evictionCount);
        return stats;
    }

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            loadSuccessCount += s.loadSuccessCount;
            loadExceptionCount += s.loadExceptionCount;
            totalLoadTime += s.totalLoadTime;
            evictionCount += s.evictionCount;
        }
        CacheStats stats = new CacheStats(hitCount, missCount, loadSuccessCount, 
                loadExceptionCount, totalLoadTime, evictionCount);
        return stats;
    }

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    }
    
    private String getStats(CachedRuleReader cacheRuleReader) {
        CacheStats stats = cacheRuleReader.getStats();
        return new StringBuilder()
                .append("<b>RuleStats</b><ul>")
                .append("<li>size: ").append(cacheRuleReader.getCacheSize())
                    .append("/")
                    .append(cacheRuleReader.getCacheInitParams().getSize()).append("</li>")
                .append("<li>hitCount: ").append(stats.hitCount()).append("</li>")
                .append("<li>missCount: ").append(stats.missCount()).append("</li>")
                .append("<li>loadSuccessCount: ").append(stats.loadSuccessCount()).append("</li>")
                .append("<li>loadExceptionCount: ").append(stats.loadExceptionCount()).append("</li>")
                .append("<li>totalLoadTime: ").append(stats.totalLoadTime()).append("</li>")
                .append("<li>evictionCount: ").append(stats.evictionCount()).append("</li>")
                .append("</ul>").toString();
        
    }

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                .append("</ul>").toString();
        
    }


    private String getUserStats(CachedRuleReader cacheRuleReader) {
        CacheStats stats;
        StringBuilder sb;
        stats = cacheRuleReader.getUserStats();
        sb = new StringBuilder().append("<b>UserStats</b><ul>")
                .append("<li>size: ").append(cacheRuleReader.getUserCacheSize())
                    .append("/")
                    .append(cacheRuleReader.getCacheInitParams().getSize()).append("</li>")
                .append("<li>hitCount: ").append(stats.hitCount()).append("</li>")
                .append("<li>missCount: ").append(stats.missCount()).append("</li>")
                .append("<li>loadSuccessCount: ").append(stats.loadSuccessCount()).append("</li>")
                .append("<li>loadExceptionCount: ").append(stats.loadExceptionCount()).append("</li>")
                .append("<li>totalLoadTime: ").append(stats.totalLoadTime()).append("</li>")
                .append("<li>evictionCount: ").append(stats.evictionCount()).append("</li>")
                .append("</ul>");
        return sb.toString();
    }

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    @Override
    public void handleGet() {
        //        Representation representation = new StringRepresentation(stats.toString());
        //        getResponse().setEntity(representation);
        CacheStats stats = crr.getStats();


        StringBuilder sb = new StringBuilder()
                .append("RuleStats[")
                .append(" size:").append(crr.getCacheSize())
                .append("/").append(crr.getCacheInitParams().getSize())
                .append(" hitCount:").append(stats.hitCount())
                .append(" missCount:").append(stats.missCount())
                .append(" loadSuccessCount:").append(stats.loadSuccessCount())
                .append(" loadExceptionCount:").append(stats.loadExceptionCount())
                .append(" totalLoadTime:").append(stats.totalLoadTime())
                .append(" evictionCount:").append(stats.evictionCount())
                .append("] \n");


        stats = crr.getUserStats();
        sb.append("UserStats[")
                .append(" size:").append(crr.getUserCacheSize())
                .append("/").append(crr.getCacheInitParams().getSize())
                .append(" hitCount:").append(stats.hitCount())
                .append(" missCount:").append(stats.missCount())
                .append(" loadSuccessCount:").append(stats.loadSuccessCount())
                .append(" loadExceptionCount:").append(stats.loadExceptionCount())
                .append(" totalLoadTime:").append(stats.totalLoadTime())
                .append(" evictionCount:").append(stats.evictionCount())
                .append("] \n");


       getResponse().setEntity(new StringRepresentation(sb));
    }

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