@RequestMapping("{cacheName}/{key}/details")
@ResponseBody
public Object keyDetail(
@PathVariable("cacheName") String cacheName, @PathVariable("key") String key, Model model) {
Element element = cacheManager.getCache(cacheName).get(key);
String dataPattern = "yyyy-MM-dd hh:mm:ss";
Map<String, Object> data = Maps.newHashMap();
data.put("objectValue", element.getObjectValue().toString());
data.put("size", PrettyMemoryUtils.prettyByteSize(element.getSerializedSize()));
data.put("hitCount", element.getHitCount());
Date latestOfCreationAndUpdateTime = new Date(element.getLatestOfCreationAndUpdateTime());
data.put(
"latestOfCreationAndUpdateTime",
DateFormatUtils.format(latestOfCreationAndUpdateTime, dataPattern));
Date lastAccessTime = new Date(element.getLastAccessTime());
data.put("lastAccessTime", DateFormatUtils.format(lastAccessTime, dataPattern));
if (element.getExpirationTime() == Long.MAX_VALUE) {
data.put("expirationTime", "不过期");
} else {
Date expirationTime = new Date(element.getExpirationTime());
data.put("expirationTime", DateFormatUtils.format(expirationTime, dataPattern));
}
data.put("timeToIdle", element.getTimeToIdle());
data.put("timeToLive", element.getTimeToLive());
data.put("version", element.getVersion());
return data;
}
/**
* Measures the size of the memory store by measuring the serialized size of all elements. If the
* objects are not Serializable they count as 0.
*
* <p>Warning: This method can be very expensive to run. Allow approximately 1 second per 1MB of
* entries. Running this method could create liveness problems because the object lock is held for
* a long period
*
* @return the size, in bytes
*/
public final long getSizeInBytes() throws CacheException {
long sizeInBytes = 0;
for (Object o : map.values()) {
Element element = (Element) o;
if (element != null) {
sizeInBytes += element.getSerializedSize();
}
}
return sizeInBytes;
}
/**
* Bootstraps the cache from a random CachePeer. Requests are done in chunks estimated at 5MB
* Serializable size. This balances memory use on each end and network performance.
*
* <p>Bootstrapping requires the establishment of a cluster. This can be instantaneous for
* manually configued clusters or may take a number of seconds for multicast ones. This method
* waits up to 11 seconds for a cluster to form.
*
* @throws RemoteCacheException if anything goes wrong with the remote call
*/
public void doLoad(Ehcache cache) throws RemoteCacheException {
List cachePeers = acquireCachePeers(cache);
if (cachePeers == null || cachePeers.size() == 0) {
LOG.debug(
"Empty list of cache peers for cache "
+ cache.getName()
+ ". No cache peer to bootstrap from.");
return;
}
Random random = new Random();
int randomPeerNumber = random.nextInt(cachePeers.size());
CachePeer cachePeer = (CachePeer) cachePeers.get(randomPeerNumber);
LOG.debug("Bootstrapping " + cache.getName() + " from " + cachePeer);
try {
// Estimate element size
Element sampleElement = null;
List keys = cachePeer.getKeys();
for (int i = 0; i < keys.size(); i++) {
Serializable key = (Serializable) keys.get(i);
sampleElement = cachePeer.getQuiet(key);
if (sampleElement != null && sampleElement.getSerializedSize() != 0) {
break;
}
}
if (sampleElement == null) {
LOG.debug(
"All cache peer elements were either null or empty. Nothing to bootstrap from. Cache was "
+ cache.getName()
+ ". Cache peer was "
+ cachePeer);
return;
}
long size = sampleElement.getSerializedSize();
int chunkSize = (int) (maximumChunkSizeBytes / size);
List requestChunk = new ArrayList();
for (int i = 0; i < keys.size(); i++) {
Serializable serializable = (Serializable) keys.get(i);
requestChunk.add(serializable);
if (requestChunk.size() == chunkSize) {
fetchAndPutElements(cache, requestChunk, cachePeer);
requestChunk.clear();
}
}
// get leftovers
fetchAndPutElements(cache, requestChunk, cachePeer);
LOG.debug(
"Bootstrap of "
+ cache.getName()
+ " from "
+ cachePeer
+ " finished. "
+ keys.size()
+ " keys requested.");
} catch (Throwable t) {
throw new RemoteCacheException(
"Error bootstrapping from remote peer. Message was: " + t.getMessage(), t);
}
}
/**
* Performance and capacity tests.
*
* <p>
*/
@Test
public void testBootstrap() throws CacheException, InterruptedException, RemoteException {
// load up some data
StopWatch stopWatch = new StopWatch();
Integer index = null;
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 1000; j++) {
index = Integer.valueOf(((1000 * i) + j));
cache1.put(
new Element(
index,
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"));
}
}
long elapsed = stopWatch.getElapsedTime();
long putTime = ((elapsed / 1000));
LOG.info("Put Elapsed time: " + putTime);
assertEquals(2000, cache1.getSize());
Thread.sleep(7000);
assertEquals(2000, manager2.getCache("sampleCache1").getSize());
assertEquals(2000, manager3.getCache("sampleCache1").getSize());
assertEquals(2000, manager4.getCache("sampleCache1").getSize());
assertEquals(2000, manager5.getCache("sampleCache1").getSize());
// now test bootstrap
manager1.addCache("bootStrapResults");
Cache cache = manager1.getCache("bootStrapResults");
List cachePeers = manager1.getCacheManagerPeerProvider("RMI").listRemoteCachePeers(cache1);
CachePeer cachePeer = (CachePeer) cachePeers.get(0);
List keys = cachePeer.getKeys();
assertEquals(2000, keys.size());
Element firstElement = cachePeer.getQuiet((Serializable) keys.get(0));
long size = firstElement.getSerializedSize();
assertEquals(504, size);
int chunkSize = (int) (5000000 / size);
List requestChunk = new ArrayList();
for (int i = 0; i < keys.size(); i++) {
Serializable serializable = (Serializable) keys.get(i);
requestChunk.add(serializable);
if (requestChunk.size() == chunkSize) {
fetchAndPutElements(cache, requestChunk, cachePeer);
requestChunk.clear();
}
}
// get leftovers
fetchAndPutElements(cache, requestChunk, cachePeer);
assertEquals(keys.size(), cache.getSize());
}