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From "ASF GitHub Bot (JIRA)" <server-...@james.apache.org>
Subject [jira] [Commented] (JAMES-2295) JMS mailqueue deadlock when a single thread issue several consume
Date Wed, 11 Jul 2018 15:56:00 GMT

    [ https://issues.apache.org/jira/browse/JAMES-2295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16540283#comment-16540283
] 

ASF GitHub Bot commented on JAMES-2295:
---------------------------------------

Github user nstdio commented on a diff in the pull request:

    https://github.com/apache/james-project/pull/127#discussion_r201747663
  
    --- Diff: server/queue/queue-api/src/main/java/org/apache/james/queue/api/EmptyConsumerOptions.java
---
    @@ -0,0 +1,39 @@
    +/****************************************************************
    + * Licensed to the Apache Software Foundation (ASF) under one   *
    + * or more contributor license agreements.  See the NOTICE file *
    + * distributed with this work for additional information        *
    + * regarding copyright ownership.  The ASF licenses this file   *
    + * to you under the Apache License, Version 2.0 (the            *
    + * "License"); you may not use this file except in compliance   *
    + * with the License.  You may obtain a copy of the License at   *
    + *                                                              *
    + *   http://www.apache.org/licenses/LICENSE-2.0                 *
    + *                                                              *
    + * Unless required by applicable law or agreed to in writing,   *
    + * software distributed under the License is distributed on an  *
    + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
    + * KIND, either express or implied.  See the License for the    *
    + * specific language governing permissions and limitations      *
    + * under the License.                                           *
    + ****************************************************************/
    +
    +package org.apache.james.queue.api;
    +
    +/**
    + * The stub implementation for {@code ConsumerOptions}. Simply returns given argument.
    + */
    +final class EmptyConsumerOptions implements MailQueue.ConsumerOptions {
    --- End diff --
    
    Yes, good idea, definitely it can.


> JMS mailqueue deadlock when a single thread issue several consume
> -----------------------------------------------------------------
>
>                 Key: JAMES-2295
>                 URL: https://issues.apache.org/jira/browse/JAMES-2295
>             Project: James Server
>          Issue Type: Bug
>          Components: Queue
>    Affects Versions: 3.0.0, master, 3.0.1
>            Reporter: Tellier Benoit
>            Priority: Major
>              Labels: bug
>
> This will lead to a dead lock:
> {code:java}
>         MailQueue.MailQueueItem mailQueueItem1 = getMailQueue().deQueue();
>         MailQueue.MailQueueItem mailQueueItem2 = getMailQueue().deQueue();
>         mailQueueItem1.done(true);
>         mailQueueItem2.done(true);
> {code}



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