MemoryQueue.java

  1. /*
  2.  * Copyright (c) 2002-2022, City of Paris
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  *  1. Redistributions of source code must retain the above copyright notice
  10.  *     and the following disclaimer.
  11.  *
  12.  *  2. Redistributions in binary form must reproduce the above copyright notice
  13.  *     and the following disclaimer in the documentation and/or other materials
  14.  *     provided with the distribution.
  15.  *
  16.  *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
  17.  *     contributors may be used to endorse or promote products derived from
  18.  *     this software without specific prior written permission.
  19.  *
  20.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21.  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23.  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
  24.  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25.  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26.  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27.  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28.  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30.  * POSSIBILITY OF SUCH DAMAGE.
  31.  *
  32.  * License 1.0
  33.  */
  34. package fr.paris.lutece.portal.service.mail;

  35. import java.util.ArrayList;
  36. import java.util.List;

  37. import org.apache.commons.collections.CollectionUtils;

  38. /**
  39.  * MemoryQueue
  40.  */
  41. public class MemoryQueue implements IMailQueue
  42. {
  43.     private List<MailItem> _listMails = new ArrayList<>( );

  44.     /**
  45.      * Put a mail item into the list of the queue
  46.      *
  47.      * @param item
  48.      *            The mail item to add to the queue
  49.      */
  50.     public void send( MailItem item )
  51.     {
  52.         synchronized( _listMails )
  53.         {
  54.             _listMails.add( item );
  55.         }
  56.     }

  57.     /**
  58.      * Get a mail item from the list and remove it from the queue
  59.      *
  60.      * @return The older mail item of the queue
  61.      */
  62.     public MailItem consume( )
  63.     {
  64.         MailItem item = null;

  65.         synchronized( _listMails )
  66.         {
  67.             if ( CollectionUtils.isNotEmpty( _listMails ) )
  68.             {
  69.                 item = _listMails.get( 0 );
  70.                 _listMails.remove( 0 );
  71.             }
  72.         }

  73.         return item;
  74.     }

  75.     /**
  76.      * get the MemoryQueue size
  77.      *
  78.      * @return the MemoryQueue size
  79.      */
  80.     public int size( )
  81.     {
  82.         return _listMails.size( );
  83.     }
  84. }