Examples of com.persistit.SessionId

com.persistit.SessionId

Identity key for a session. Normally there is one session per thread, but applications that need to maintain session context across multiple network requests serviced on different threads can access and carefully modify their session contexts using SessionID. See {@link Persistit#getSessionId()} and{@link Persistit#setSessionId(SessionId)}.

A SessionId instance holds a reference to the Thread currently associated with it; initially this this the thread that created the SessionId. The setSessionId method reassigns the thread field. The {@link #isAlive()} method indicates whether the associated thread isalive. The {@link Persistit#cleanup()} method cleans up all transactionresources for SessionId instances whose threads are no longer alive.

A session is used to maintain state, including the {@link Transaction}context and map of cached {@link Exchange} maintained by{@link Persistit#getExchange(String,String,boolean)}. Therefore care must be taken to limit the maximum number of SessionId instances created during the lifetime of a Persistit instance and to manage them appropriately.

@author peter

    private static final Logger log = LoggerFactory.getLogger(PersistitTransaction.class);


    private static Queue<SessionId> sessionPool = new ConcurrentLinkedQueue<SessionId>();


    private static SessionId getSessionId() {
        SessionId s = sessionPool.poll();
        if (s == null) {
            s = new SessionId();
        }
        return s;
    }

    }


    @Override
    public <T> T run(Session session, Callable<T> callable) {
        Transaction oldTransaction = getTransaction(session);
        SessionId oldSessionId = null;
        Long oldStartMillis = null;
        if ((oldTransaction != null) &&
            // Anything that would prevent begin() from working.
            (oldTransaction.isActive() ||
             oldTransaction.isRollbackPending() ||
             oldTransaction.isCommitted())) {
            oldSessionId = treeService.getDb().getSessionId();
            treeService.getDb().setSessionId(new SessionId());
            session.remove(TXN_KEY);
            oldStartMillis = session.remove(START_MILLIS_KEY);
        }
        try {
            for(int tries = 1; ; ++tries) {

Examples of com.persistit.SessionId

Related Classes of com.persistit.SessionId