Example usage for org.springframework.data.neo4j.transaction SessionHolder SessionHolder

Introduction

In this page you can find the example usage for org.springframework.data.neo4j.transaction SessionHolder SessionHolder.

Prototype

public SessionHolder(Session session) 

Source Link

Usage

From source file:org.springframework.data.neo4j.transaction.SessionFactoryUtils.java

public static Session getSession(SessionFactory sessionFactory) throws IllegalStateException {

    Assert.notNull(sessionFactory, "No SessionFactory specified");

    SessionHolder sessionHolder = (SessionHolder) TransactionSynchronizationManager.getResource(sessionFactory);
    if (sessionHolder != null) {
        if (!sessionHolder.isSynchronizedWithTransaction()
                && TransactionSynchronizationManager.isSynchronizationActive()) {
            sessionHolder.setSynchronizedWithTransaction(true);
            TransactionSynchronizationManager
                    .registerSynchronization(new SessionSynchronization(sessionHolder, sessionFactory, false));
        }//w  w w.j a  v  a  2  s  .  co m
        return sessionHolder.getSession();
    }

    if (!TransactionSynchronizationManager.isSynchronizationActive()) {
        return null;
    }

    Session session = sessionFactory.openSession();

    if (TransactionSynchronizationManager.isCurrentTransactionReadOnly()) {
        System.out.println("hitting read only txn.");
    }

    logger.debug("Registering transaction synchronization for Neo4j Session");
    // Use same Session for further Neo4j actions within the transaction.
    // Thread object will get removed by synchronization at transaction completion.

    sessionHolder = new SessionHolder(session);
    sessionHolder.setSynchronizedWithTransaction(true);
    TransactionSynchronizationManager
            .registerSynchronization(new SessionSynchronization(sessionHolder, sessionFactory, true));
    TransactionSynchronizationManager.bindResource(sessionFactory, sessionHolder);

    return session;
}

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From source file:org.springframework.data.neo4j.web.support.OpenSessionInViewInterceptor.java

@Override
public void preHandle(WebRequest request) throws DataAccessException {
    String participateAttributeName = getParticipateAttributeName();

    WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
    if (asyncManager.hasConcurrentResult()) {
        if (applyCallableInterceptor(asyncManager, participateAttributeName)) {
            return;
        }//w  w w .j av a 2 s  . c  o  m
    }

    if (TransactionSynchronizationManager.hasResource(getSessionFactory())) {
        // Do not modify the Session: just mark the request accordingly.
        Integer count = (Integer) request.getAttribute(participateAttributeName, WebRequest.SCOPE_REQUEST);
        int newCount = (count != null ? count + 1 : 1);
        request.setAttribute(getParticipateAttributeName(), newCount, WebRequest.SCOPE_REQUEST);
    } else {
        logger.debug("Opening Neo4j OGM Session in OpenSessionInViewInterceptor");
        Session session = sessionFactory.openSession();
        SessionHolder sessionHolder = new SessionHolder(session);
        TransactionSynchronizationManager.bindResource(getSessionFactory(), sessionHolder);

        AsyncRequestInterceptor interceptor = new AsyncRequestInterceptor(getSessionFactory(), sessionHolder);
        asyncManager.registerCallableInterceptor(participateAttributeName, interceptor);
        asyncManager.registerDeferredResultInterceptor(participateAttributeName, interceptor);
    }
}

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