Using Ehcache to cache objects into JVM's memory and into Disk -


i want use cache manage 500mb data ,so made test. want put 200mb data jvm's memory , other 300mb put disk.

so every element had put 2mb data, had set cachemanager's maxbyteslocalheap 250mb , cache's maxbyteslocalheap 200mb, when finished case, found there more 170mb data in jvm , disk data more 290mb. printed keys in disk, found there 250 keys, not 150 keys.

it means that: disk data has 250 keys , there 500mb data in disk data , it's not wanted ...

i don't know why ? watched codes, hadn't find reasons , test code : 

private static final string cache_path = "java.io.tmpdir"; private static string max_memory = "512m"; private static string block_max_memory = "512m"; private static string data_max_memory = "512m";  private static mcachemanager instance; private properties props = null; private cachemanager cachemanager = null; private cache memorycache; private cache datacache;  public static mcachemanager getinstance() {     if (instance == null) {         synchronized (mcachemanager.class) {             if (instance == null) {                 instance = new mcachemanager();             }         }     }     return instance; }  private mcachemanager() {     super();     double maxmemory = (runtime.getruntime().maxmemory() *0.4) / (1024*1024);//m     max_memory = maxmemory+""; }  public cache memorycache() {     if (memorycache == null) {         synchronized (this) {             if (memorycache == null) {                 string maxmemory = getproperty("block.cache.max.memory", block_max_memory);                 memorycache = getcache("__memorycache__",maxmemory,false);             }         }     }     return memorycache; }  public cache datacache() {     if (datacache == null) {         synchronized (this) {             string maxmemory = getproperty("data.cache.max.memory", data_max_memory);             datacache = getcache("__datacache__",maxmemory,true);         }     }     return datacache; }  private cache getcache(string cachename, string maxmemory, boolean savedisk) {     cache cache = getcachemanager().getcache(cachename);     if (cache == null) {         synchronized (this) {             cache = getcachemanager().getcache(cachename);             if (cache == null) {                 cacheconfiguration cacheconfig = new cacheconfiguration();                 cacheconfig.name(cachename);                 cacheconfig.eternal(false);                 cacheconfig.setmemorystoreevictionpolicy("lru");                 cacheconfig.setoverflowtodisk(savedisk);                 cacheconfig.setdiskpersistent(true);                 cacheconfig.setmaxbyteslocalheap(maxmemory);                 cache = new cache(cacheconfig);                 getcachemanager().addcache(cache);             }         }     }     return cache; }  private cachemanager getcachemanager() {     if (cachemanager == null) {         synchronized (this) {             if (cachemanager == null) {                 configuration configuration = new configuration();                 diskstoreconfiguration dscg = new diskstoreconfiguration();                 dscg.setpath(getproperty("cache.path.disk", cache_path));                 configuration.diskstore(dscg);                 configuration.setmaxbyteslocalheap(getproperty("cache.manager.max.memory", max_memory));                 configuration.setdynamicconfig(true);                 configuration.setmonitoring("autodetect");                 configuration.setupdatecheck(false);                 cachemanager = new cachemanager(configuration);             }         }     }     return cachemanager; }  private string getproperty(string key, string defaultvalue) {     if (props == null) {         synchronized (this) {             if (props == null) {                 try {                     inputstream stream = thread.currentthread().getcontextclassloader().getresourceasstream("/cache.properties");                     if (stream == null) {                         stream = mcachemanager.class.getresourceasstream("/cache.properties");                     }                     props = new properties();                     props.load(stream);                 } catch (exception e) {                     logger.error(e.getmessage());                 }             }         }     }     return props.getproperty(key, defaultvalue); }

this cache.properties :

####################### cache settings ######## cache file path ############## = 100m cache.path.disk = f:\ ######## cachemanager max memorysize k|k|m|m|g|g############## = 100m cache.manager.max.memory = 1000m ######## blockset cache ######## max memory , k|k|m|m|g|g ############## = 100m block.cache.max.memory = 100m ######## dataset cache ######## max memory , k|k|m|m|g|g############## = 100m data.cache.max.memory = 100m

i want hope : 300mb data . how use cache manage 200mb data in jvm , 300mb data disk ...


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