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From conflue...@apache.org
Subject [CONF] Apache Camel: Resequencer (page edited)
Date Tue, 30 Sep 2008 07:09:00 GMT
<html>
<head>
    <base href="http://cwiki.apache.org/confluence" />
    <style type="text/css">
    <!--
    body, p, td, table, tr, .bodytext, .stepfield {
	font-family: Verdana, arial, sans-serif;
	font-size: 11px;
	line-height: 16px;
	color: #000000;
	font-weight: normal;
}
#PageContent {
	text-align: left;
	background-color: #fff;
	padding: 0px;
	margin: 0px;
    padding-bottom:20px;
}
/*
** when this stylesheet is used for the Tiny MCE Wysiwyg editor's edit area, we can't
** use an id=PageContent or class=wiki-content, so we must
** set the body style to that used for PageContent, and p to that used for wiki-content.
*/

body {
	margin: 0px;
	padding: 0px;
	text-align: center;
    background-color: #f0f0f0;
}

@media print {

body {
    background-color: #fff;
}

}

.monospaceInput {
    font:12px monospace
}

.wiki-content p, .commentblock p {
    margin: 16px 0px 16px 0px;
    padding: 0px;
}

.wiki-content-preview {
    padding: 5px;
    border-left: 1px solid #3c78b5;
    border-right: 1px solid #3c78b5;
}

ul, ol {
    margin-top: 2px;
    margin-bottom: 2px;
    padding-top: 0px;
    padding-bottom: 0px;
}

pre {
    padding: 0px;
    margin-top: 5px;
    margin-left: 15px;
    margin-bottom: 5px;
    margin-right: 5px;
    text-align: left;
}

.helpheading {
    font-weight: bold;
    background-color: #D0D9BD;
        border-bottom: 1px solid #3c78b5;
        padding: 4px 4px 4px 4px;
        margin: 0px;
        margin-top: 10px;
}
.helpcontent {
        padding: 4px 4px 20px 4px;
    background-color: #f5f7f1;
}

.code {
 	border: 1px dashed #3c78b5;
    font-size: 11px;
	font-family: Courier;
    margin: 10px;
	line-height: 13px;
}

.focusedComment {
    background: #ffffce;
}

.commentBox, .focusedComment {
    padding: 10px;
    margin: 5px 0 5px 0;
    border: 1px #bbb solid;
}

.codeHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.codeContent {
    text-align: left;
    background-color: #f0f0f0;
    padding: 3px;
}

.preformatted {
 	border: 1px dashed #3c78b5;
    font-size: 11px;
	font-family: Courier;
    margin: 10px;
	line-height: 13px;
}

.preformattedHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.preformattedContent {
    background-color: #f0f0f0;
    padding: 3px;
}

.panel {
 	border: 1px dashed #3c78b5;
    margin: 10px;
    margin-top: 0px;
}

.panelHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.panelContent {
    background-color: #f0f0f0;
    padding: 5px;
}

.anonymousAlert {
    background-color: #f0f0f0;
 	border: 1px dashed red;
    font-size: 11px;
    padding: 10px 5px 10px 5px;
    margin: 4px;
	line-height: 13px;
}

.lockAlert {
    background-color: #f0f0f0;
    width: 50%;
 	border: 1px dashed red;
    font-size: 11px;
    padding: 10px 5px 10px 5px;
    margin: 4px;
	line-height: 13px;
}


.code-keyword {
  color: #000091;
  background-color: inherit;
}

.code-object {
  color: #910091;
  background-color: inherit;
}

.code-quote {
  color: #009100;
  background-color: inherit;
}

.code-comment {
  color: #808080;
  background-color: inherit;
}


.code-xml .code-keyword {
  color: inherit;
  font-weight: bold;
}

.code-tag {
  color: #000091;
  background-color: inherit;
}

.breadcrumbs {
    background-color: #f0f0f0;
 	border-color: #3c78b5;
	border-width: 1px 0px 1px 0px;
	border-style: solid;
    font-size: 11px;
    padding: 3px 0px 3px 0px;
}

.navmenu {
    border: 1px solid #ccc;
}

.menuheading {
    font-weight: bold;
    background-color: #f0f0f0;
 	border-bottom: 1px solid #3c78b5;
	padding: 4px 4px 2px 4px;
}

.menuitems {
	padding: 4px 4px 20px 4px;
}

.rightpanel {
    border-left: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}

#helpheading {
    text-align: left;
    font-weight: bold;
    background-color: #D0D9BD;
 	border-bottom: 1px solid #3c78b5;
	padding: 4px 4px 4px 4px;
	margin: 0px;
}
#helpcontent {
	padding: 4px 4px 4px 4px;
    background-color: #f5f7f1;
}
.helptab-unselected {
    font-weight: bold;
	padding: 5px;
    background-color: #f5f7f1;
}
.helptab-selected {
    font-weight: bold;
    background-color: #D0D9BD;
	padding: 5px;
}
.helptabs {
    margin: 0px;
    background-color: #f5f7f1;
	padding: 5px;
}
.infopanel-heading {
    font-weight: bold;
	padding: 4px 0px 2px 0px;
}

.pagebody {
}

.pageheader {
	padding: 5px 5px 5px 0px;
 	border-bottom: 1px solid #3c78b5;
}

.pagetitle {
	font-size: 22px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
}

.newpagetitle {
    color: #ccc !important;
}

.steptitle {
	font-size: 18px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
	margin-bottom: 7px;
}

.substeptitle {
    font-size: 12px;
    font-weight: bold;
    font-family: Arial, sans-serif;
    color: #003366;
    margin: 2px 4px 4px 4px;
    padding: 2px 4px 1px 4px;
}

.stepdesc {
    font-family: Verdana, arial, sans-serif;
	font-size: 11px;
	line-height: 16px;
	font-weight: normal;
    color: #666666;
    margin-top: 7px;
    margin-bottom: 7px;
}

.steplabel {
    font-weight: bold;
    margin-right: 4px;
    color: black;
    float: left;
    width: 15%;
    text-align: right;
}

.stepfield {
    background: #f0f0f0;
    padding: 5px;
}

.submitButtons{
    margin-top:5px;
    text-align:right;
}

.formtitle {
	font-size: 12px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
}

.sectionbottom {
    border-bottom: 1px solid #3c78b5;
}

.topRow {
    border-top: 2px solid #3c78b5;
}

.tabletitle {
	font-size: 14px;
	font-weight: bold;
	font-family: Arial, sans-serif;
    padding: 3px 0px 2px 0px;
    margin: 8px 4px 2px 0px;
	color: #003366;
	border-bottom: 2px solid #3c78b5;
}
.pagesubheading {
    color: #666666;
    font-size: 10px;
    padding: 0px 0px 5px 0px;
}

HR {
	color: 3c78b5;
	height: 1;
}

A:link, A:visited, A:active, A:hover {
	color: #003366;
}

h1 A:link, h1 A:visited, h1 A:active {
	text-decoration: none;
}

h1 A:hover {
    border-bottom: 1px dotted #003366;
}

.wiki-content > :first-child, .commentblock > :first-child {
    margin-top: 3px;
}

.logocell {
    padding: 10px;
}

input {
	font-family: verdana, geneva, arial, sans-serif;
	font-size: 11px;
	color: #000000;
}

textarea, textarea.editor {
	font-family: verdana, geneva, arial, sans-serif;
	font-size: 11px;
	color: #333333;
}

/* use logoSpaceLink instead.
.spacenametitle {
	font: 21px/31px Impact, Arial, Helvetica;
    font-weight: 100;
    color: #999999;
	margin: 0px;
}
.spacenametitle img {
  margin: 0 0 -4px 0;
}
.spacenametitle a {
    text-decoration: none;
    color: #999999;
}
.spacenametitle a:visited {
    text-decoration: none;
    color: #999999;
}*/

.spacenametitle-printable {
	font: 20px/25px Impact, Arial, Helvetica;
    font-weight: 100;
    color: #999999;
	margin: 0px;
}
.spacenametitle-printable a {
    text-decoration: none;
    color: #999999;
}
.spacenametitle-printable a:visited {
    text-decoration: none;
    color: #999999;
}

.blogDate {
	font-weight: bold;
	text-decoration: none;
	color: black;
}

.blogSurtitle {
    background: #f0f0f0;
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.blogHeading {
    font-size: 20px;
    line-height: normal;
    font-weight: bold;
    padding: 0px;
    margin: 0px;
}

.blogHeading a {
   text-decoration: none;
   color: black;
}

.endsection {
	align: right;
	color: #666666;
	margin-top: 10px;
}
.endsectionleftnav {
	align: right;
	color: #666666;
	margin-top: 10px;
}

h1 {
	font-size: 24px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	color: #003366;
 	border-bottom: 1px solid #3c78b5;
	padding: 2px;
	margin: 36px 0px 4px 0px;
}

h2 {
	font-size: 18px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
 	border-bottom: 1px solid #3c78b5;
	padding: 2px;
	margin: 27px 0px 4px 0px;
}

h3 {
	font-size: 14px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 21px 0px 4px 0px;
}

h4 {
	font-size: 12px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 18px 0px 4px 0px;
}

h4.search {
	font-size: 12px;
	line-height: normal;
	font-weight: normal;
	background-color: #f0f0f0;
	padding: 4px;
	margin: 18px 0px 4px 0px;
}

h5 {
	font-size: 10px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 14px 0px 4px 0px;
}

h6 {
	font-size: 8px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 14px 0px 4px 0px;
}

.smallfont {
    font-size: 10px;
}
.descfont {
    font-size: 10px;
    color: #666666;
}
.smallerfont {
    font-size: 9px;
}
.smalltext {
    color: #666666;
    font-size: 10px;
}
.smalltext a {
    color: #666666;
}
.smalltext-blue {
    color: #3c78b5;
    font-size: 10px;
}
.surtitle {
    margin-left: 1px;
    margin-bottom: 5px;
    font-size: 14px;
    color: #666666;
}

/* css hack found here:  http://www.fo3nix.pwp.blueyonder.co.uk/tutorials/css/hacks/ */
.navItemOver { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #003366;
cursor: hand; voice-family: '\'}\''; voice-family:inherit; cursor: pointer;}
.navItemOver a { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItemOver a:visited { color: #ffffff; background-color:#003366; text-decoration: none;
}
.navItemOver a:hover { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItem { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #3c78b5;
}
.navItem a { color: #ffffff; text-decoration: none; }
.navItem a:hover { color: #ffffff; text-decoration: none; }
.navItem a:visited { color: #ffffff; text-decoration: none; }

div.padded { padding: 4px; }
div.thickPadded { padding: 10px; }
h3.macrolibrariestitle {
    margin: 0px 0px 0px 0px;
}

div.centered { text-align: center; margin: 10px; }
div.centered table {margin: 0px auto; text-align: left; }

.tableview table {
    margin: 0;
}

.tableview th {
    text-align: left;
    color: #003366;
    font-size: 12px;
    padding: 5px 0px 0px 5px;
    border-bottom: 2px solid #3c78b5;
}
.tableview td {
    text-align: left;
    border-color: #ccc;
    border-width: 0px 0px 1px 0px;
    border-style: solid;
    margin: 0;
    padding: 4px 10px 4px 5px;
}

.grid {
    margin: 2px 0px 5px 0px;
    border-collapse: collapse;
}
.grid th  {
    border: 1px solid #ccc;
    padding: 2px 4px 2px 4px;
    background: #f0f0f0;
    text-align: center;
}
.grid td  {
    border: 1px solid #ccc;
    padding: 3px 4px 3px 4px;
}
.gridHover {
	background-color: #f9f9f9;
}

td.infocell {
    background-color: #f0f0f0;
}
.label {
	font-weight: bold;
	color: #003366;
}

label {
	font-weight: bold;
	color: #003366;
}

.error {
	background-color: #fcc;
}

.errorBox {
	background-color: #fcc;
    border: 1px solid #c00;
    padding: 5px;
    margin: 5px;
}

.errorMessage {
	color: #c00;
}

.success {
	background-color: #dfd;
}

.successBox {
	background-color: #dfd;
    border: 1px solid #090;
    padding: 5px;
    margin-top:5px;
    margin-bottom:5px;
}

blockquote {
	padding-left: 10px;
	padding-right: 10px;
	margin-left: 5px;
	margin-right: 0px;
	border-left: 1px solid #3c78b5;
}

table.confluenceTable
{
    margin: 5px;
    border-collapse: collapse;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the
border: none attribute from the sectionMacro class */
table.confluenceTable td.confluenceTd
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the
border: none attribute from the sectionMacro class */
table.confluenceTable th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

td.confluenceTd
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

DIV.small {
	font-size: 9px;
}

H1.pagename {
	margin-top: 0px;
}

IMG.inline  {}

.loginform {
    margin: 5px;
    border: 1px solid #ccc;
}

/* The text how the "This is a preview" comment should be shown. */
.previewnote { text-align: center;
                font-size: 11px;
                    color: red; }

/* How the preview content should be shown */
.previewcontent { background: #E0E0E0; }

/* How the system messages should be shown (DisplayMessage.jsp) */
.messagecontent { background: #E0E0E0; }

/* How the "This page has been modified..." -comment should be shown. */
.conflictnote { }

.createlink {
    color: maroon;
}
a.createlink {
    color: maroon;
}
.templateparameter {
    font-size: 9px;
    color: darkblue;
}

.diffadded {
    background: #ddffdd;
    padding: 1px 1px 1px 4px;
	border-left: 4px solid darkgreen;
}
.diffdeleted {
    color: #999;
    background: #ffdddd;
    padding: 1px 1px 1px 4px;
	border-left: 4px solid darkred;
}
.diffnochange {
    padding: 1px 1px 1px 4px;
	border-left: 4px solid lightgrey;
}
.differror {
    background: brown;
}
.diff {
    font-family: lucida console, courier new, fixed-width;
	font-size: 12px;
	line-height: 14px;
}
.diffaddedchars {
    background-color:#99ff99;
    font-weight:bolder;
}
.diffremovedchars {
    background-color:#ff9999;
    text-decoration: line-through;
    font-weight:bolder;
}

.greybackground {
    background: #f0f0f0
}

.greybox {
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.borderedGreyBox {
    border: 1px solid #cccccc;
    background-color: #f0f0f0;
    padding: 10px;
}

.greyboxfilled {
 	border: 1px solid #ddd;
    background: #f0f0f0;
    padding: 3px;
	margin: 1px 1px 10px 1px;
}

.navBackgroundBox {
    padding: 5px 5px 5px 5px;
    font-size: 22px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: white;
    background: #3c78b5;
    text-decoration: none;
}

.previewBoxTop {
	background-color: #f0f0f0;
    border-width: 1px 1px 0px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 5px 0px 0px 0px;
    text-align: center;
}
.previewContent {
    background-color: #fff;
 	border-color: #3c78b5;
	border-width: 0px 1px 0px 1px;
	border-style: solid;
	padding: 10px;
	margin: 0px;
}
.previewBoxBottom {
	background-color: #f0f0f0;
    border-width: 0px 1px 1px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 0px 0px 5px 0px;
    text-align: center;
}

.functionbox {
    background-color: #f0f0f0;
 	border: 1px solid #3c78b5;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.functionbox-greyborder {
    background-color: #f0f0f0;
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.search-highlight {
    background-color: #ffffcc;
}

/* normal (white) background */
.rowNormal {
    background-color: #ffffff;
 }

/* alternate (pale yellow) background */
.rowAlternate {
    background-color: #f7f7f7;
}

/* used in the list attachments table */
.rowAlternateNoBottomColor {
    background-color: #f7f7f7;
}

.rowAlternateNoBottomNoColor {
}

.rowAlternateNoBottomColor td {
    border-bottom: 0px;
}

.rowAlternateNoBottomNoColor td {
    border-bottom: 0px;
}

/* row highlight (grey) background */
.rowHighlight {
    background-color: #f0f0f0;

}

TD.greenbar {FONT-SIZE: 2px; BACKGROUND: #00df00; BORDER: 1px solid #9c9c9c; PADDING: 0px;
}
TD.redbar {FONT-SIZE: 2px; BACKGROUND: #df0000; BORDER: 1px solid #9c9c9c; PADDING: 0px; }
TD.darkredbar {FONT-SIZE: 2px; BACKGROUND: #af0000; BORDER: 1px solid #9c9c9c; PADDING: 0px;
}

TR.testpassed {FONT-SIZE: 2px; BACKGROUND: #ddffdd; PADDING: 0px; }
TR.testfailed {FONT-SIZE: 2px; BACKGROUND: #ffdddd; PADDING: 0px; }

.toolbar  {
    margin: 0px;
    border-collapse: collapse;
}

.toolbar td  {
    border: 1px solid #ccc;
    padding: 2px 2px 2px 2px;
    color: #ccc;
}

td.noformatting {
    border-width: 0px;
    border-style: none;
    text-align: center;
	padding: 0px;
}

.commentblock {
    margin: 12px 0 12px 0;
}

/*
 * Divs displaying the license information, if necessary.
 */
.license-eval, .license-none, .license-nonprofit {
    border-top: 1px solid #bbbbbb;
    text-align: center;
    font-size: 10px;
    font-family: Verdana, Arial, Helvetica, sans-serif;
}

.license-eval, .license-none {
    background-color: #ffcccc;
}

.license-eval b, .license-none b {
    color: #990000
}

.license-nonprofit {
    background-color: #ffffff;
}

/*
 * The shadow at the bottom of the page between the main content and the
 * "powered by" section.
 */
.bottomshadow {
    height: 12px;
    background-image: url("$req.contextPath/images/border/border_bottom.gif");
    background-repeat: repeat-x;
}

/*
 * Styling of the operations box
 */
.navmenu .operations li, .navmenu .operations ul {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.navmenu .operations ul {
    margin-bottom: 9px;
}

.navmenu .label {
    font-weight: inherit;
}

/*
 * Styling of ops as a toolbar
 */
.toolbar div {
    display: none;
}

.toolbar .label {
    display: none;
}

.toolbar .operations {
    display: block;
}

.toolbar .operations ul {
    display: inline;
    list-style: none;
    margin-left: 10px;
    padding-left: 0;
}

.toolbar .operations li {
    list-style: none;
    display: inline;
}

/* list page navigational tabs */
#foldertab {
padding: 3px 0px 3px 8px;
margin-left: 0;
border-bottom: 1px solid #3c78b5;
font: bold 11px Verdana, sans-serif;
}

#foldertab li {
list-style: none;
margin: 0;
display: inline;
}

#foldertab li a {
padding: 3px 0.5em;
margin-left: 3px;
border: 1px solid #3c78b5;
border-bottom: none;
background: #3c78b5;
text-decoration: none;
}

#foldertab li a:link { color: #ffffff; }
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/******* Left Navigation Theme Styles ********/
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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/CAMEL">CAMEL</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CAMEL/Resequencer">Resequencer</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAMEL/Resequencer">Resequencer</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~mrt1nz">Martin
Krasser</a>
            <span class="smallfont">(Sep 30, 2008)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=55179&originalVersion=10&revisedVersion=11">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h3><a name="Resequencer-Resequencer"></a>Resequencer</h3>

<p>The <span class="nobr"><a href="http://www.enterpriseintegrationpatterns.com/Resequencer.html"
title="Visit page outside Confluence" rel="nofollow">Resequencer<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span> from the <a href="/confluence/display/CAMEL/Enterprise+Integration+Patterns"
title="Enterprise Integration Patterns">EIP patterns</a> allows you to reorganise
messages based on some comparator. By default in Camel we use an <a href="/confluence/display/CAMEL/Expression"
title="Expression">Expression</a> to create the comparator; so that you can compare
by a message header or the body or a piece of a message etc.</p>

<p><img src="http://www.enterpriseintegrationpatterns.com/img/Resequencer.gif" align="absmiddle"
border="0" /></p>

<p>Camel supports two resequencing algorithms:</p>

<ul>
	<li><b>Batch resequencing</b> collects messages into a batch, sorts the
messages and sends them to their output.</li>
	<li><b>Stream resequencing</b> re-orders (continuous) message streams based
on the detection of gaps between messages.</li>
</ul>


<h3><a name="Resequencer-BatchResequencing"></a>Batch Resequencing</h3>

<p>The following example shows how to use the batch-processing resequencer so that messages
are sorted in order of the <b>body()</b> expression. That is messages are collected
into a batch (either by a maximum number of messages per batch or using a timeout) then they
are sorted in order and then sent out to their output.</p>

<p><b>Using the <a href="/confluence/display/CAMEL/Fluent+Builders" title="Fluent
Builders">Fluent Builders</a></b></p>

<div class="code"><div class="codeContent">
<pre class="code-java">from(<span class="code-quote">"direct:start"</span>).resequencer(body()).to(<span
class="code-quote">"mock:result"</span>);</pre>
</div></div>

<p>This is equvalent to </p>

<div class="code"><div class="codeContent">
<pre class="code-java">from(<span class="code-quote">"direct:start"</span>).resequencer(body()).batch().to(<span
class="code-quote">"mock:result"</span>);</pre>
</div></div>

<p>The batch-processing resequencer can be further configured via the <tt>size()</tt>
and <tt>timeout()</tt> methods.</p>

<div class="code"><div class="codeContent">
<pre class="code-java">from(<span class="code-quote">"direct:start"</span>).resequencer(body()).batch().size(300).timeout(4000L).to(<span
class="code-quote">"mock:result"</span>)</pre>
</div></div>

<p>This sets the batch size to 300 and the batch timeout to 4000 ms (by default, the
batch size is 100 and the timeout is 1000 ms). Alternatively, you can provide a configuration
object.</p>

<div class="code"><div class="codeContent">
<pre class="code-java">from(<span class="code-quote">"direct:start"</span>).resequencer(body()).batch(<span
class="code-keyword">new</span> BatchResequencerConfig(300, 4000L)).to(<span class="code-quote">"mock:result"</span>)</pre>
</div></div>


<p>So the above example will reorder messages from endpoint <b>direct:a</b>
in order of their bodies, to the endpoint <b>mock:result</b>. Typically you'd
use a header rather than the body to order things; or maybe a part of the body. So you could
replace this expression with</p>

<div class="code"><div class="codeContent">
<pre class="code-java">resequencer(header(<span class="code-quote">"JMSPriority"</span>))</pre>
</div></div>

<p>for example to reorder messages using their JMS priority.</p>

<p>You can of course use many different <a href="/confluence/display/CAMEL/Expression"
title="Expression">Expression</a> languages such as <a href="/confluence/display/CAMEL/XPath"
title="XPath">XPath</a>, <a href="/confluence/display/CAMEL/XQuery" title="XQuery">XQuery</a>,
<a href="/confluence/display/CAMEL/SQL" title="SQL">SQL</a> or various <a href="/confluence/display/CAMEL/Scripting+Languages"
title="Scripting Languages">Scripting Languages</a>.</p>

<p>You can also use multiple expressions; so you could for example sort by priority
first then some other custom header</p>

<div class="code"><div class="codeContent">
<pre class="code-java">resequencer(header(<span class="code-quote">"JMSPriority"</span>),
header(<span class="code-quote">"MyCustomerRating"</span>))</pre>
</div></div>

<p><b>Using the <a href="/confluence/display/CAMEL/Spring+XML+Extensions" title="Spring
XML Extensions">Spring XML Extensions</a></b></p>

<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;camelContext id=<span
class="code-quote">"camel"</span> xmlns=<span class="code-quote">"http://activemq.apache.org/camel/schema/spring"</span>&gt;</span>
  <span class="code-tag">&lt;route&gt;</span>
    <span class="code-tag">&lt;from uri=<span class="code-quote">"direct:start"</span>
/&gt;</span>
    <span class="code-tag">&lt;resequencer&gt;</span>
      <span class="code-tag">&lt;simple&gt;</span>body<span class="code-tag">&lt;/simple&gt;</span>
      <span class="code-tag">&lt;to uri=<span class="code-quote">"mock:result"</span>
/&gt;</span>
      &lt;!-- 
        batch-config can be ommitted for default (batch) resequencer settings
      --&gt;
      <span class="code-tag">&lt;batch-config batchSize=<span class="code-quote">"300"</span>
batchTimeout=<span class="code-quote">"4000"</span> /&gt;</span>
    <span class="code-tag">&lt;/resequencer&gt;</span>
  <span class="code-tag">&lt;/route&gt;</span>
<span class="code-tag">&lt;/camelContext&gt;</span></pre>
</div></div>

<h3><a name="Resequencer-StreamResequencing"></a>Stream Resequencing</h3>

<p>The next example shows how to use the stream-processing resequencer. Messages are
re-ordered based on their sequence numbers given by a <tt>seqnum</tt> header using
gap detection and timeouts on the level of individual messages. </p>

<p><b>Using the <a href="/confluence/display/CAMEL/Fluent+Builders" title="Fluent
Builders">Fluent Builders</a></b></p>

<div class="code"><div class="codeContent">
<pre class="code-java">from(<span class="code-quote">"direct:start"</span>).resequencer(header(<span
class="code-quote">"seqnum"</span>)).stream().to(<span class="code-quote">"mock:result"</span>);</pre>
</div></div>

<p>The stream-processing resequencer can be further configured via the <tt>capacity()</tt>
and <tt>timeout()</tt> methods.</p>

<div class="code"><div class="codeContent">
<pre class="code-java">from(<span class="code-quote">"direct:start"</span>).resequencer(header(<span
class="code-quote">"seqnum"</span>)).stream().capacity(5000).timeout(4000L).to(<span
class="code-quote">"mock:result"</span>)</pre>
</div></div>

<p>This sets the resequencer's capacity to 5000 and the timeout to 4000 ms (by default,
the capacity is 100 and the timeout is 1000 ms). Alternatively, you can provide a configuration
object.</p>

<div class="code"><div class="codeContent">
<pre class="code-java">from(<span class="code-quote">"direct:start"</span>).resequencer(header(<span
class="code-quote">"seqnum"</span>)).stream(<span class="code-keyword">new</span>
StreamResequencerConfig(5000, 4000L)).to(<span class="code-quote">"mock:result"</span>)</pre>
</div></div>

<p>The stream-processing resequencer algorithm is based on the detection of gaps in
a message stream rather than on a fixed batch size. Gap detection in combination with timeouts
removes the constraint of having to know the number of messages of a sequence (i.e. the batch
size) in advance. Messages must contain a unique sequence number for which a predecessor and
a successor is known. For example a message with the sequence number 3 has a predecessor message
with the sequence number 2 and a successor message with the sequence number 4. The message
sequence 2,3,5 has a gap because the sucessor of 3 is missing. The resequencer therefore has
to retain message 5 until message 4 arrives (or a timeout occurs). </p>

<p>If the maximum time difference between messages (with successor/predecessor relationship
with respect to the sequence number) in a message stream is known, then the resequencer's
timeout parameter should be set to this value. In this case it is guaranteed that all messages
of a stream are delivered in correct order to the next processor. The lower the timeout value
is compared to the out-of-sequence time difference the higher is the probability for out-of-sequence
messages delivered by this resequencer. Large timeout values should be supported by sufficiently
high capacity values. The capacity parameter is used to prevent the resequencer from running
out of memory. </p>

<p>By default, the stream resequencer expects <tt>long</tt> sequence numbers
but other sequence numbers types can be supported as well by providing a custom comparator
via the <tt>comparator()</tt> method</p>

<div class="code"><div class="codeContent">
<pre class="code-java">ExpressionResultComparator&lt;Exchange&gt; comparator
= <span class="code-keyword">new</span> MyComparator();
from(<span class="code-quote">"direct:start"</span>).resequencer(header(<span
class="code-quote">"seqnum"</span>)).stream().comparator(comparator).to(<span
class="code-quote">"mock:result"</span>);</pre>
</div></div>

<p>or via a <tt>StreamResequencerConfig</tt> object.</p>

<div class="code"><div class="codeContent">
<pre class="code-java">ExpressionResultComparator&lt;Exchange&gt; comparator
= <span class="code-keyword">new</span> MyComparator();
StreamResequencerConfig config = <span class="code-keyword">new</span> StreamResequencerConfig(100,
1000L, comparator);
from(<span class="code-quote">"direct:start"</span>).resequencer(header(<span
class="code-quote">"seqnum"</span>)).stream(config).to(<span class="code-quote">"mock:result"</span>);</pre>
</div></div>

<p><b>Using the <a href="/confluence/display/CAMEL/Spring+XML+Extensions" title="Spring
XML Extensions">Spring XML Extensions</a></b></p>

<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;camelContext id=<span
class="code-quote">"camel"</span> xmlns=<span class="code-quote">"http://activemq.apache.org/camel/schema/spring"</span>&gt;</span>
  <span class="code-tag">&lt;route&gt;</span>
    <span class="code-tag">&lt;from uri=<span class="code-quote">"direct:start"</span>/&gt;</span>
    <span class="code-tag">&lt;resequencer&gt;</span>
      <span class="code-tag">&lt;simple&gt;</span>in.header.seqnum<span
class="code-tag">&lt;/simple&gt;</span>
      <span class="code-tag">&lt;to uri=<span class="code-quote">"mock:result"</span>
/&gt;</span>
      <span class="code-tag">&lt;stream-config capacity=<span class="code-quote">"5000"</span>
timeout=<span class="code-quote">"4000"</span>/&gt;</span>
    <span class="code-tag">&lt;/resequencer&gt;</span>
  <span class="code-tag">&lt;/route&gt;</span>
<span class="code-tag">&lt;/camelContext&gt;</span></pre>
</div></div>

<h3><a name="Resequencer-FurtherExamples"></a>Further Examples</h3>

<p>For further examples of this pattern in use you could look at the <span class="nobr"><a
href="http://svn.apache.org/viewvc/activemq/camel/trunk/camel-core/src/test/java/org/apache/camel/processor/ResequencerTest.java?view=markup"
title="Visit page outside Confluence" rel="nofollow">batch-processing resequencer junit
test case<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif"
height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span>
and the <span class="nobr"><a href="http://svn.apache.org/viewvc/activemq/camel/trunk/camel-core/src/test/java/org/apache/camel/processor/StreamResequencerTest.java?view=markup"
title="Visit page outside Confluence" rel="nofollow">stream-processing resequencer junit
test case<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif"
height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span></p>

<h4><a name="Resequencer-UsingThisPattern"></a>Using This Pattern</h4>

<p>If you would like to use this EIP Pattern then please read the <a href="/confluence/display/CAMEL/Getting+Started"
title="Getting Started">Getting Started</a>, you may also find the <a href="/confluence/display/CAMEL/Architecture"
title="Architecture">Architecture</a> useful particularly the description of <a
href="/confluence/display/CAMEL/Endpoint" title="Endpoint">Endpoint</a> and <a
href="/confluence/display/CAMEL/URIs" title="URIs">URIs</a>. Then you could try out
some of the <a href="/confluence/display/CAMEL/Examples" title="Examples">Examples</a>
first before trying this pattern out.</p>
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