Java Session.access方法代码示例

import org.apache.catalina.Session; //导入方法依赖的package包/类
/**
 * {@inheritDoc}
 * <p>
 * This method checks the persistence store if persistence is enabled,
 * otherwise just uses the functionality from ManagerBase.
 */
@Override
public Session findSession(String id) throws IOException {

    Session session = super.findSession(id);
    // OK, at this point, we're not sure if another thread is trying to
    // remove the session or not so the only way around this is to lock it
    // (or attempt to) and then try to get it by this session id again. If
    // the other code ran swapOut, then we should get a null back during
    // this run, and if not, we lock it out so we can access the session
    // safely.
    if(session != null) {
        synchronized(session){
            session = super.findSession(session.getIdInternal());
            if(session != null){
               // To keep any external calling code from messing up the
               // concurrency.
               session.access();
               session.endAccess();
            }
        }
    }
    if (session != null)
        return session;

    // See if the Session is in the Store
    session = swapIn(id);
    return session;
}
 

import org.apache.catalina.Session; //导入方法依赖的package包/类
/**
 * Return the active Session, associated with this Manager, with the
 * specified session id (if any); otherwise return <code>null</code>.
 * This method checks the persistence store if persistence is enabled,
 * otherwise just uses the functionality from ManagerBase.
 *
 * @param id The session id for the session to be returned
 *
 * @exception IllegalStateException if a new session cannot be
 *  instantiated for any reason
 * @exception IOException if an input/output error occurs while
 *  processing this request
 */
public Session findSession(String id) throws IOException {

    Session session = super.findSession(id);
    // OK, at this point, we're not sure if another thread is trying to
    // remove the session or not so the only way around this is to lock it
    // (or attempt to) and then try to get it by this session id again. If
    // the other code ran swapOut, then we should get a null back during
    // this run, and if not, we lock it out so we can access the session
    // safely.
    if(session != null) {
        synchronized(session){
            session = super.findSession(session.getIdInternal());
            if(session != null){
               // To keep any external calling code from messing up the
               // concurrency.
               session.access();
               session.endAccess();
            }
        }
    }
    if (session != null)
        return (session);

    // See if the Session is in the Store
    session = swapIn(id);
    return (session);

}
 

import org.apache.catalina.Session; //导入方法依赖的package包/类
/**
 * {@inheritDoc}
 * <p>
 * This method checks the persistence store if persistence is enabled,
 * otherwise just uses the functionality from ManagerBase.
 */
@Override
public Session findSession(String id) throws IOException {

	Session session = super.findSession(id);
	// OK, at this point, we're not sure if another thread is trying to
	// remove the session or not so the only way around this is to lock it
	// (or attempt to) and then try to get it by this session id again. If
	// the other code ran swapOut, then we should get a null back during
	// this run, and if not, we lock it out so we can access the session
	// safely.
	if (session != null) {
		synchronized (session) {
			session = super.findSession(session.getIdInternal());
			if (session != null) {
				// To keep any external calling code from messing up the
				// concurrency.
				session.access();
				session.endAccess();
			}
		}
	}
	if (session != null)
		return session;

	// See if the Session is in the Store
	session = swapIn(id);
	return session;
}
 

import org.apache.catalina.Session; //导入方法依赖的package包/类
/**
 * Return the session associated with this Request, creating one
 * if necessary and requested.
 *
 * @param create Create a new session if one does not exist
 */
@Override
public HttpSession getSession(boolean create) {

    if (crossContext) {
        
        // There cannot be a session if no context has been assigned yet
        if (context == null)
            return (null);

        // Return the current session if it exists and is valid
        if (session != null && session.isValid()) {
            return (session.getSession());
        }

        HttpSession other = super.getSession(false);
        if (create && (other == null)) {
            // First create a session in the first context: the problem is
            // that the top level request is the only one which can 
            // create the cookie safely
            other = super.getSession(true);
        }
        if (other != null) {
            Session localSession = null;
            try {
                localSession =
                    context.getManager().findSession(other.getId());
                if (localSession != null && !localSession.isValid()) {
                    localSession = null;
                }
            } catch (IOException e) {
                // Ignore
            }
            if (localSession == null && create) {
                localSession = 
                    context.getManager().createSession(other.getId());
            }
            if (localSession != null) {
                localSession.access();
                session = localSession;
                return session.getSession();
            }
        }
        return null;

    } else {
        return super.getSession(create);
    }

}
 

import org.apache.catalina.Session; //导入方法依赖的package包/类
@Test
public void backsUpOnce_56698() throws IOException, LifecycleException,
        InterruptedException {

    // Setup Tomcat instance
    Tomcat tomcat = getTomcatInstance();

    // No file system docBase required
    Context ctx = tomcat.addContext("", null);
    ctx.setDistributable(true);

    Tomcat.addServlet(ctx, "DummyServlet", new DummyServlet());
    ctx.addServletMapping("/dummy", "DummyServlet");

    PersistentManager manager = new PersistentManager();
    TesterStore store = new TesterStore();

    manager.setStore(store);
    manager.setMaxIdleBackup(0);
    ctx.setManager(manager);
    tomcat.start();
    String sessionId = getUrl("http://localhost:" + getPort() + "/dummy")
            .toString();

    // Note: PersistenceManager.findSession() silently updates
    // session.lastAccessedTime, so call it only once before other work.
    Session session = manager.findSession(sessionId);

    // Wait until request processing ends, as Request.recycle() updates
    // session.lastAccessedTime via session.endAccess().
    waitWhileSessionIsActive((StandardSession) session);

    long lastAccessedTime = session.getLastAccessedTimeInternal();

    // Session should be idle at least for 0 second (maxIdleBackup)
    // to be eligible for persistence, thus no need to wait.

    // Waiting a bit, to catch changes in last accessed time of a session
    waitForClockUpdate();

    manager.processPersistenceChecks();
    Assert.assertEquals(Arrays.asList(sessionId), store.getSavedIds());
    Assert.assertEquals(lastAccessedTime, session.getLastAccessedTimeInternal());

    // session was not accessed, so no save will be performed
    waitForClockUpdate();
    manager.processPersistenceChecks();
    Assert.assertEquals(Arrays.asList(sessionId), store.getSavedIds());
    Assert.assertEquals(lastAccessedTime, session.getLastAccessedTimeInternal());

    // access session
    session.access();
    session.endAccess();

    // session was accessed, so it will be saved once again
    manager.processPersistenceChecks();
    Assert.assertEquals(Arrays.asList(sessionId, sessionId),
            store.getSavedIds());

    // session was not accessed, so once again no save will happen
    manager.processPersistenceChecks();
    Assert.assertEquals(Arrays.asList(sessionId, sessionId),
            store.getSavedIds());
}
 

import org.apache.catalina.Session; //导入方法依赖的package包/类
/**
 * Return the session associated with this Request, creating one
 * if necessary and requested.
 *
 * @param create Create a new session if one does not exist
 */
public HttpSession getSession(boolean create) {

    if (crossContext) {
        
        // There cannot be a session if no context has been assigned yet
        if (context == null)
            return (null);

        // Return the current session if it exists and is valid
        if (session != null && session.isValid()) {
            return (session.getSession());
        }

        HttpSession other = super.getSession(false);
        if (create && (other == null)) {
            // First create a session in the first context: the problem is
            // that the top level request is the only one which can 
            // create the cookie safely
            other = super.getSession(true);
        }
        if (other != null) {
            Session localSession = null;
            try {
                localSession =
                    context.getManager().findSession(other.getId());
            } catch (IOException e) {
                // Ignore
            }
            if (localSession == null && create) {
                localSession = 
                    context.getManager().createSession(other.getId());
            }
            if (localSession != null) {
                localSession.access();
                session = localSession;
                return session.getSession();
            }
        }
        return null;

    } else {
        return super.getSession(create);
    }

}
 

import org.apache.catalina.Session; //导入方法依赖的package包/类
/**
 * Select the appropriate child Context to process this request,
 * based on the specified request URI.  If no matching Context can
 * be found, return an appropriate HTTP error.
 *
 * @param request Request to be processed
 * @param response Response to be produced
 * @param valveContext Valve context used to forward to the next Valve
 *
 * @exception IOException if an input/output error occurred
 * @exception ServletException if a servlet error occurred
 */
public void invoke(Request request, Response response,
                   ValveContext valveContext)
    throws IOException, ServletException {

    // Validate the request and response object types
    if (!(request.getRequest() instanceof HttpServletRequest) ||
        !(response.getResponse() instanceof HttpServletResponse)) {
        return;     // NOTE - Not much else we can do generically
    }

    // Select the Context to be used for this Request
    StandardHost host = (StandardHost) getContainer();
    Context context = (Context) host.map(request, true);
    if (context == null) {
        ((HttpServletResponse) response.getResponse()).sendError
            (HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
             sm.getString("standardHost.noContext"));
        return;
    }

    // Bind the context CL to the current thread
    Thread.currentThread().setContextClassLoader
        (context.getLoader().getClassLoader());

    // Update the session last access time for our session (if any)
    HttpServletRequest hreq = (HttpServletRequest) request.getRequest();
    String sessionId = hreq.getRequestedSessionId();
    if (sessionId != null) {
        Manager manager = context.getManager();
        if (manager != null) {
            Session session = manager.findSession(sessionId);
            if ((session != null) && session.isValid())
                session.access();
        }
    }

    // Ask this Context to process this request
    context.invoke(request, response);

}
 

import org.apache.catalina.Session; //导入方法依赖的package包/类
/**
 * Return the session associated with this Request, creating one if
 * necessary and requested.
 *
 * @param create
 *            Create a new session if one does not exist
 */
@Override
public HttpSession getSession(boolean create) {

	if (crossContext) {

		// There cannot be a session if no context has been assigned yet
		if (context == null)
			return (null);

		// Return the current session if it exists and is valid
		if (session != null && session.isValid()) {
			return (session.getSession());
		}

		HttpSession other = super.getSession(false);
		if (create && (other == null)) {
			// First create a session in the first context: the problem is
			// that the top level request is the only one which can
			// create the cookie safely
			other = super.getSession(true);
		}
		if (other != null) {
			Session localSession = null;
			try {
				localSession = context.getManager().findSession(other.getId());
				if (localSession != null && !localSession.isValid()) {
					localSession = null;
				}
			} catch (IOException e) {
				// Ignore
			}
			if (localSession == null && create) {
				localSession = context.getManager().createSession(other.getId());
			}
			if (localSession != null) {
				localSession.access();
				session = localSession;
				return session.getSession();
			}
		}
		return null;

	} else {
		return super.getSession(create);
	}

}