/** Invoked after a non-sticky session is removed from memcached. */
protected void onAfterDeleteFromMemcached(@Nonnull final String sessionId) {
final long start = System.currentTimeMillis();
final String validityInfoKey = _sessionIdFormat.createValidityInfoKeyName(sessionId);
_memcached.delete(validityInfoKey);
if (_storeSecondaryBackup) {
_memcached.delete(_sessionIdFormat.createBackupKey(sessionId));
_memcached.delete(_sessionIdFormat.createBackupKey(validityInfoKey));
}
_stats.registerSince(NON_STICKY_AFTER_DELETE_FROM_MEMCACHED, start);
}
/**
* Is invoked for the backup of a non-sticky session that was not accessed for the current
* request.
*/
protected void onBackupWithoutLoadedSession(
@Nonnull final String sessionId,
@Nonnull final String requestId,
@Nonnull final BackupSessionService backupSessionService) {
if (!_sessionIdFormat.isValid(sessionId)) {
return;
}
try {
final long start = System.currentTimeMillis();
final String validityKey = _sessionIdFormat.createValidityInfoKeyName(sessionId);
final SessionValidityInfo validityInfo = loadSessionValidityInfoForValidityKey(validityKey);
if (validityInfo == null) {
_log.warn("Found no validity info for session id " + sessionId);
return;
}
final int maxInactiveInterval = validityInfo.getMaxInactiveInterval();
final byte[] validityData =
encode(maxInactiveInterval, System.currentTimeMillis(), System.currentTimeMillis());
// fix for #88, along with the change in session.getMemcachedExpirationTimeToSet
final int expiration = maxInactiveInterval <= 0 ? 0 : maxInactiveInterval;
final Future<Boolean> validityResult =
_memcached.set(validityKey, toMemcachedExpiration(expiration), validityData);
if (!_manager.isSessionBackupAsync()) {
validityResult.get(_manager.getSessionBackupTimeout(), TimeUnit.MILLISECONDS);
}
/*
* - ping session
* - ping session backup
* - save validity backup
*/
final Callable<?> backupSessionTask =
new OnBackupWithoutLoadedSessionTask(
sessionId, _storeSecondaryBackup, validityKey, validityData, maxInactiveInterval);
_executor.submit(backupSessionTask);
if (_log.isDebugEnabled()) {
_log.debug("Stored session validity info for session " + sessionId);
}
_stats.registerSince(NON_STICKY_ON_BACKUP_WITHOUT_LOADED_SESSION, start);
} catch (final Throwable e) {
_log.warn("An error when trying to load/update validity info.", e);
}
}
protected void releaseLock(@Nonnull final String sessionId) {
try {
if (_log.isDebugEnabled()) {
_log.debug("Releasing lock for session " + sessionId);
}
final long start = System.currentTimeMillis();
_memcached.delete(_sessionIdFormat.createLockName(sessionId)).get();
_stats.registerSince(RELEASE_LOCK, start);
} catch (final Exception e) {
_log.warn("Caught exception when trying to release lock for session " + sessionId, e);
}
}
protected void acquireLock(
@Nonnull final String sessionId,
final long retryInterval,
final long maxRetryInterval,
final long timeout,
final long start)
throws InterruptedException, ExecutionException, TimeoutException {
final Future<Boolean> result =
_memcached.add(_sessionIdFormat.createLockName(sessionId), 5, LOCK_VALUE);
if (result.get().booleanValue()) {
if (_log.isDebugEnabled()) {
_log.debug("Locked session " + sessionId);
}
return;
} else {
checkTimeoutAndWait(sessionId, retryInterval, timeout, start);
acquireLock(
sessionId, min(retryInterval * 2, maxRetryInterval), maxRetryInterval, timeout, start);
}
}
@CheckForNull
protected SessionValidityInfo loadBackupSessionValidityInfo(@Nonnull final String sessionId) {
final String key = _sessionIdFormat.createValidityInfoKeyName(sessionId);
final String backupKey = _sessionIdFormat.createBackupKey(key);
return loadSessionValidityInfoForValidityKey(backupKey);
}
@CheckForNull
protected SessionValidityInfo loadSessionValidityInfo(@Nonnull final String sessionId) {
return loadSessionValidityInfoForValidityKey(
_sessionIdFormat.createValidityInfoKeyName(sessionId));
}
/**
* Is invoked after the backup of the session is initiated, it's represented by the provided
* backupResult. The requestId is identifying the request.
*/
protected void onAfterBackupSession(
@Nonnull final MemcachedBackupSession session,
final boolean backupWasForced,
@Nonnull final Future<BackupResult> result,
@Nonnull final String requestId,
@Nonnull final BackupSessionService backupSessionService) {
if (!_sessionIdFormat.isValid(session.getIdInternal())) {
return;
}
try {
final long start = System.currentTimeMillis();
final int maxInactiveInterval = session.getMaxInactiveInterval();
final byte[] validityData =
encode(
maxInactiveInterval,
session.getLastAccessedTimeInternal(),
session.getThisAccessedTimeInternal());
final String validityKey =
_sessionIdFormat.createValidityInfoKeyName(session.getIdInternal());
// fix for #88, along with the change in session.getMemcachedExpirationTimeToSet
final int expiration = maxInactiveInterval <= 0 ? 0 : maxInactiveInterval;
final Future<Boolean> validityResult =
_memcached.set(validityKey, toMemcachedExpiration(expiration), validityData);
if (!_manager.isSessionBackupAsync()) {
// TODO: together with session backup wait not longer than sessionBackupTimeout.
// Details: Now/here we're waiting the whole session backup timeout, even if (perhaps) some
// time
// was spent before when waiting for session backup result.
// For sync session backup it would be better to set both the session data and
// validity info and afterwards wait for both results (but in sum no longer than
// sessionBackupTimeout)
validityResult.get(_manager.getSessionBackupTimeout(), TimeUnit.MILLISECONDS);
}
if (_log.isDebugEnabled()) {
_log.debug("Stored session validity info for session " + session.getIdInternal());
}
/* The following task are performed outside of the request thread (includes waiting for the backup result):
* - ping session if the backup was skipped (depends on the backup result)
* - save secondary session backup if session was modified (backup not skipped)
* - ping secondary session backup if the backup was skipped
* - save secondary validity backup
*/
final boolean pingSessionIfBackupWasSkipped = !backupWasForced;
final boolean performAsyncTasks = pingSessionIfBackupWasSkipped || _storeSecondaryBackup;
if (performAsyncTasks) {
final Callable<?> backupSessionTask =
new OnAfterBackupSessionTask(
session,
result,
pingSessionIfBackupWasSkipped,
backupSessionService,
_storeSecondaryBackup,
validityKey,
validityData);
_executor.submit(backupSessionTask);
}
_stats.registerSince(NON_STICKY_AFTER_BACKUP, start);
} catch (final Throwable e) {
_log.warn("An error occurred during onAfterBackupSession.", e);
}
}