1 /*

     2  * Copyright 2007-2008 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package com.sun.jmx.event;

    27 

    28 import com.sun.jmx.remote.util.ClassLogger;

    29 import java.util.ArrayList;

    30 import java.util.Collections;

    31 import java.util.List;

    32 import javax.management.remote.NotificationResult;

    33 import javax.management.remote.TargetedNotification;

    34 

    35 

    36 public class ReceiverBuffer {

    37     public void addNotifs(NotificationResult nr) {

    38         if (nr == null) {

    39             return;

    40         }

    41 

    42         TargetedNotification[] tns = nr.getTargetedNotifications();

    43 

    44         if (logger.traceOn()) {

    45             logger.trace("addNotifs", "" + tns.length);

    46         }

    47 

    48         long impliedStart = nr.getEarliestSequenceNumber();

    49         final long missed = impliedStart - start;

    50         start = nr.getNextSequenceNumber();

    51 

    52         if (missed > 0) {

    53             if (logger.traceOn()) {

    54                 logger.trace("addNotifs",

    55                         "lost: "+missed);

    56             }

    57 

    58             lost += missed;

    59         }

    60 

    61         Collections.addAll(notifList, nr.getTargetedNotifications());

    62     }

    63 

    64     public TargetedNotification[] removeNotifs() {

    65         if (logger.traceOn()) {

    66             logger.trace("removeNotifs", String.valueOf(notifList.size()));

    67         }

    68 

    69         if (notifList.size() == 0) {

    70             return null;

    71         }

    72 

    73         TargetedNotification[] ret = notifList.toArray(

    74                 new TargetedNotification[]{});

    75         notifList.clear();

    76 

    77         return ret;

    78     }

    79 

    80     public int size() {

    81         return notifList.size();

    82     }

    83 

    84     public int removeLost() {

    85         int ret = lost;

    86         lost = 0;

    87         return ret;

    88     }

    89 

    90     private List<TargetedNotification> notifList

    91             = new ArrayList<TargetedNotification>();

    92     private long start = 0;

    93     private int lost = 0;

    94 

    95     private static final ClassLogger logger =

    96             new ClassLogger("javax.management.event", "ReceiverBuffer");

    97 }