RMIConnectionImpl.java 文件源码

public NotificationResult fetchNotifications(long clientSequenceNumber,
                                             int maxNotifications,
                                             long timeout)
    throws IOException {

    if (logger.debugOn()) logger.debug("fetchNotifications",
                           "connectionId=" + connectionId
                           +", timeout=" + timeout);

    if (maxNotifications < 0 || timeout < 0)
        throw new IllegalArgumentException("Illegal negative argument");

    final boolean serverTerminated =
        serverCommunicatorAdmin.reqIncoming();
    try {
        if (serverTerminated) {
            // we must not call fetchNotifs() if the server is
            // terminated (timeout elapsed).
            //
            return new NotificationResult(0L, 0L,
                                          new TargetedNotification[0]);

        }
        final long csn = clientSequenceNumber;
        final int mn = maxNotifications;
        final long t = timeout;
        PrivilegedAction<NotificationResult> action =
            new PrivilegedAction<NotificationResult>() {
                public NotificationResult run() {
                    return getServerNotifFwd().fetchNotifs(csn, t, mn);
                }
        };
        if (acc == null)
            return action.run();
        else
            return AccessController.doPrivileged(action, acc);
    } finally {
        serverCommunicatorAdmin.rspOutgoing();
    }
}