public boolean delete(Object key) {
if (!isValidKeyType(key)) {
return false;
}
EntityManager em = emf.createEntityManager();
try {
long entityFindBegin = timeService.time();
Object entity = em.find(configuration.entityClass(), key);
stats.addEntityFind(timeService.time() - entityFindBegin);
if (entity == null) {
return false;
}
MetadataEntity metadata = null;
if (configuration.storeMetadata()) {
byte[] keyBytes;
try {
keyBytes = marshaller.objectToByteBuffer(key);
} catch (Exception e) {
throw new JpaStoreException("Failed to marshall key", e);
}
long metadataFindBegin = timeService.time();
metadata = em.find(MetadataEntity.class, keyBytes);
stats.addMetadataFind(timeService.time() - metadataFindBegin);
}
EntityTransaction txn = em.getTransaction();
if (trace) log.trace("Removing " + entity + "(" + toString(metadata) + ")");
long txnBegin = timeService.time();
txn.begin();
try {
long entityRemoveBegin = timeService.time();
em.remove(entity);
stats.addEntityRemove(timeService.time() - entityRemoveBegin);
if (metadata != null) {
long metadataRemoveBegin = timeService.time();
em.remove(metadata);
stats.addMetadataRemove(timeService.time() - metadataRemoveBegin);
}
txn.commit();
stats.addRemoveTxCommitted(timeService.time() - txnBegin);
return true;
} catch (Exception e) {
stats.addRemoveTxFailed(timeService.time() - txnBegin);
throw new JpaStoreException("Exception caught in delete()", e);
} finally {
if (txn != null && txn.isActive()) txn.rollback();
}
} finally {
em.close();
}
}
@Override
public void purge(Executor threadPool, final PurgeListener listener) {
ExecutorAllCompletionService eacs = new ExecutorAllCompletionService(threadPool);
EntityManager em = emf.createEntityManager();
try {
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<MetadataEntity> cq = cb.createQuery(MetadataEntity.class);
Root root = cq.from(MetadataEntity.class);
long currentTime = timeService.wallClockTime();
cq.where(cb.le(root.get(MetadataEntity.EXPIRATION), currentTime));
for (MetadataEntity metadata : em.createQuery(cq).getResultList()) {
EntityTransaction txn = em.getTransaction();
final Object key;
try {
key = marshaller.objectFromByteBuffer(metadata.name);
} catch (Exception e) {
throw new JpaStoreException("Cannot unmarshall key", e);
}
long txnBegin = timeService.time();
txn.begin();
try {
long metadataFindBegin = timeService.time();
metadata = em.find(MetadataEntity.class, metadata.name);
stats.addMetadataFind(timeService.time() - metadataFindBegin);
// check for transaction - I hope write skew check is done here
if (metadata.expiration > currentTime) {
txn.rollback();
continue;
}
long entityFindBegin = timeService.time();
Object entity = em.find(configuration.entityClass(), key);
stats.addEntityFind(timeService.time() - entityFindBegin);
if (entity != null) { // the entry may have been removed
long entityRemoveBegin = timeService.time();
em.remove(entity);
stats.addEntityRemove(timeService.time() - entityRemoveBegin);
}
long metadataRemoveBegin = timeService.time();
em.remove(metadata);
stats.addMetadataRemove(timeService.time() - metadataRemoveBegin);
txn.commit();
stats.addRemoveTxCommitted(timeService.time() - txnBegin);
if (trace) log.trace("Expired " + key + " -> " + entity + "(" + toString(metadata) + ")");
if (listener != null) {
eacs.submit(
new Runnable() {
@Override
public void run() {
listener.entryPurged(key);
}
},
null);
}
} catch (RuntimeException e) {
stats.addRemoveTxFailed(timeService.time() - txnBegin);
throw e;
} finally {
if (txn != null && txn.isActive()) {
txn.rollback();
}
}
}
} finally {
em.close();
}
eacs.waitUntilAllCompleted();
if (eacs.isExceptionThrown()) {
throw new JpaStoreException(eacs.getFirstException());
}
}