@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;
}
private void writeElement(Element element, Serializable key) throws IOException {
try {
int bufferLength;
long expirationTime = element.getExpirationTime();
MemoryEfficientByteArrayOutputStream buffer = null;
try {
buffer = serializeEntry(element);
bufferLength = buffer.size();
DiskElement diskElement = checkForFreeBlock(bufferLength);
// Write the record
randomAccessFile.seek(diskElement.position);
randomAccessFile.write(buffer.toByteArray(), 0, bufferLength);
buffer = null;
// Add to index, update stats
diskElement.payloadSize = bufferLength;
diskElement.key = key;
diskElement.expiryTime = expirationTime;
diskElement.hitcount = element.getHitCount();
totalSize += bufferLength;
lastElementSize = bufferLength;
synchronized (diskElements) {
diskElements.put(key, diskElement);
}
} catch (OutOfMemoryError e) {
LOG.error("OutOfMemoryError on serialize: " + key);
}
} catch (Exception e) {
// Catch any exception that occurs during serialization
LOG.error(
name
+ "Cache: Failed to write element to disk '"
+ key
+ "'. Initial cause was "
+ e.getMessage(),
e);
}
}
public CacheStats getCacheStats() {
CacheStats cs = new CacheStats();
if (query.isCacheable()) {
Cache cache = ccf.get(query);
if (cache != null) {
if (cache.isKeyInCache(getId())) {
Element el = cache.get(getId());
cs.setExpired(el == null || el.isExpired());
if (el != null && !cs.isExpired()) {
cs.setLastUpdate(el.getLastUpdateTime());
cs.setExpTime(el.getExpirationTime());
cs.setHitCount(el.getHitCount());
}
}
}
}
return cs;
}
/**
* Constructor which takes an Ehcache core Element.
*
* <p>The {@link #mimeType} and {@link #value} are stored in the core Ehcache <code>value</code>
* field using {@link net.sf.ehcache.MimeTypeByteArray}
*
* <p>If the MIME Type is not set, an attempt is made to set a sensible value. The rules for
* setting the Mime Type are:
*
* <ol>
* <li>If the value in element is null, the <code>mimeType</code> is set to null.
* <li>If we stored the mimeType in ehcache, then <code>mimeType</code> is set with it.
* <li>If no mimeType was set and the value is a <code>byte[]</code> the <code>mimeType</code>
* is set to "application/octet-stream".
* <li>If no mimeType was set and the value is a <code>String</code> the <code>mimeType</code>
* is set to "text/plain".
* </ol>
*
* @param element the ehcache core Element
* @throws CacheException if an Exception occurred in the underlying cache.
*/
public Element(net.sf.ehcache.Element element) throws CacheException {
key = element.getKey();
expirationDate = element.getExpirationTime();
Object ehcacheValue = element.getObjectValue();
if (ehcacheValue == null) {
this.value = null;
this.mimeType = null;
}
if (ehcacheValue instanceof MimeTypeByteArray) {
// we have Mime Type data to extract
mimeType = ((MimeTypeByteArray) ehcacheValue).getMimeType();
if (mimeType == null) {
// Jersey is returning */* for these which I think is wrong. Reported to Paul Sandoz.
mimeType = "application/octet-stream";
}
this.value = ((MimeTypeByteArray) ehcacheValue).getValue();
} else if (ehcacheValue instanceof byte[]) {
// already a byte[]
this.value = (byte[]) ehcacheValue;
mimeType = "application/octet-stream";
} else if (ehcacheValue instanceof String) {
// a String such as XML
this.value = ((String) ehcacheValue).getBytes();
this.mimeType = "text/plain";
} else {
// A type we do not handle therefore serialize using Java Serialization
MemoryEfficientByteArrayOutputStream stream = null;
try {
stream = MemoryEfficientByteArrayOutputStream.serialize(element.getValue());
} catch (IOException e) {
throw new CacheException(e);
}
this.value = stream.getBytes();
this.mimeType = "application/x-java-serialized-object";
}
}
