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From conflue...@apache.org
Subject [CONF] Apache Camel: Async (page edited)
Date Sat, 09 May 2009 15:29:02 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;
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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/Async">Async</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAMEL/Async">Async</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~davsclaus">Claus
Ibsen</a>
            <span class="smallfont">(May 09, 2009)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=117116&originalVersion=4&revisedVersion=5">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h2><a name="Async-Async"></a>Async</h2>
<p><b>Available as of Camel 2.0</b></p>

<p>The asynchronous API in Camel have been rewritten for Camel 2.0, and the information
on this page applies for Camel 2.0 and later.</p>

<h3><a name="Async-Abitofbackground"></a>A bit of background</h3>
<p>The new <a href="/confluence/display/CAMEL/Async" title="Async">Async</a>
API in Camel 2.0 leverages in much greater detail the Java Concurrency API and its support
for executing tasks asynchronous.<br/>
Therefore the Camel <a href="/confluence/display/CAMEL/Async" title="Async">Async</a>
API should be familiar for users with knowledge of the Java Concurrency API.</p>

<h3><a name="Async-Afewconceptstomaster"></a>A few concepts to master</h3>
<p>When doing messaging there are a few aspects to keep in mind.</p>

<p>First of all a caller can initiate a message exchange as either:</p>
<ul class="alternate" type="square">
	<li><a href="/confluence/display/CAMEL/Event+Message" title="Event Message">Request
only</a></li>
	<li><a href="/confluence/display/CAMEL/Request+Reply" title="Request Reply">Request
Reply</a></li>
</ul>


<p><a href="/confluence/display/CAMEL/Event+Message" title="Event Message">Request
only</a> is when the caller sends a message but do <b>not</b> expect any
reply. This is also sometimes known as fire and forget or event message.</p>

<p>The <a href="/confluence/display/CAMEL/Request+Reply" title="Request Reply">Request
Reply</a> is then caller sends a message and then <b>waits for a reply</b>.
This is like the <a href="/confluence/display/CAMEL/HTTP" title="HTTP">Http</a>
protocol that we use every day when we surf the web.<br/>
We send a request to fetch a web page and wait until the reply message comes with the web
content.</p>

<p>In Camel a message is labeled with a Message Exchange Pattern that labels whether
its a request only or request reply message. Camel uses the <a href="/confluence/display/CAMEL/JBI"
title="JBI">JBI</a> term for this an uses <tt>InOnly</tt> for the request
only, and <tt>InOut</tt> for the request reply.</p>

<p>For both the request only and the request reply the routing in Camel can happen either:</p>
<ul class="alternate" type="square">
	<li>synchronous</li>
	<li>asynchronous</li>
</ul>


<p>A sync is defined as the caller thread and the remaining routing and processing of
the message is happening in the same thread and as sync the caller waits until this thread
has done its work before the invocation can return to the caller and continue its work. This
is illustrated in the diagram below:</p>

<p>TODO: picture </p>

<p>On the other hand the asynchronous version is where the caller thread initiates the
request and leave the further processing of the message in another thread, the asynchronous
thread, and then immediately returns to the caller. Then the caller can continue doing other
work and at the same time the asynchronous thread is processing the message. If we are using
[Request Reply then at a later point in time the original caller can get hold of the response
from the asynchronous thread. If we are using request only then there are no response but
the caller can still get a kind of response as it can get information whether the asynchronous
thread is done or failed due to an exception. This is illustrated in the diagram below:</p>

<p>In the following we will look at how to use this new <a href="/confluence/display/CAMEL/Async"
title="Async">Async</a> API in Camel.</p>

<h3><a name="Async-TheAsyncAPI"></a>The <a href="/confluence/display/CAMEL/Async"
title="Async">Async</a> API</h3>
<p>Camel provides the <a href="/confluence/display/CAMEL/Async" title="Async">Async</a>
API in the <span class="nobr"><a href="/confluence/pages/createpage.action?spaceKey=CAMEL&amp;title=Producer+Template&amp;linkCreation=true&amp;fromPageId=117116"
title="Create Page: Producer Template" class="createlink">Producer Template<sup><img
class="rendericon" src="/confluence/images/icons/plus.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> where we have added about 10 new
methods to Camel 2.0. We have listed the most important in the table below:</p>

<table class='confluenceTable'><tbody>
<tr>
<th class='confluenceTh'> Method </th>
<th class='confluenceTh'> Description </th>
</tr>
<tr>
<td class='confluenceTd'> setExecutorService </td>
<td class='confluenceTd'> Is used to set the Java ExecutorService. Camel will by default
provide a ScheduledExecutorService with 5 thread in the pool. </td>
</tr>
<tr>
<td class='confluenceTd'> asyncSend </td>
<td class='confluenceTd'> Is used to send an async exchange to a Camel <a href="/confluence/display/CAMEL/Endpoint"
title="Endpoint">Endpoint</a>. Camel will imeddiately return control to the caller
thread after the task has been submitted to the executor service. This allows you to do other
work while Camel processes the exchange in the other async thread. </td>
</tr>
<tr>
<td class='confluenceTd'> asyncSendBody </td>
<td class='confluenceTd'> As above but for sending body only. This is a request only
messaging style so no reply is expected. Uses the <tt>InOnly</tt> exchange pattern.
</td>
</tr>
<tr>
<td class='confluenceTd'> asyncRequestBody </td>
<td class='confluenceTd'> As above but for sending body only. This is a <a href="/confluence/display/CAMEL/Request+Reply"
title="Request Reply">Request Reply</a> messaging style so a reply is expected. Uses
the <tt>InOut</tt> exchange pattern. </td>
</tr>
<tr>
<td class='confluenceTd'> extractFutureBody </td>
<td class='confluenceTd'> Is used to get the result from the asynchronous thread using
the Java Concurrency Future handle. </td>
</tr>
</tbody></table>

<p>The <tt>asyncSend</tt> and <tt>asyncRequest</tt> methods
return a Future handle. This handle is what the caller must use later to retrieve the asynchronous
response. You can do this by using the <tt>extractFutureBody</tt> method, or just
use plain Java but invoke <tt>get()</tt> on the <tt>Future</tt> handle.</p>

<h3><a name="Async-Anexample"></a>An example</h3>
<p>Suppose we want to call a <a href="/confluence/display/CAMEL/HTTP" title="HTTP">Http</a>
service but it is usually slow and thus we do not want to block and wait for the response,
as we can do other important computation. So we can initiate an <a href="/confluence/display/CAMEL/Async"
title="Async">Async</a> exchange to the <a href="/confluence/display/CAMEL/HTTP"
title="HTTP">Http</a> endpoint and then do other stuff while the slow <a href="/confluence/display/CAMEL/HTTP"
title="HTTP">Http</a> service is processing our request. And then a bit later we
can use the <tt>Future</tt> handle to get the response from the <a href="/confluence/display/CAMEL/HTTP"
title="HTTP">Http</a> service. Yeah nice so lets do it:</p>

<p>First we define some routes in Camel. One for the <a href="/confluence/display/CAMEL/HTTP"
title="HTTP">Http</a> service where we simulate a slow server as it takes at least
1 second to reply. And then other route that we want to invoke while the <a href="/confluence/display/CAMEL/HTTP"
title="HTTP">Http</a> service is on route. This allows you to be able to process
the two routes simultaneously:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-comment">// The mocks are here <span
class="code-keyword">for</span> unit test
</span>
<span class="code-comment">// Some other service to <span class="code-keyword">return</span>
a name, <span class="code-keyword">this</span> is invoked synhronously
</span>from(<span class="code-quote">"direct:name"</span>).transform(constant(<span
class="code-quote">"Claus"</span>)).to(<span class="code-quote">"mock:result"</span>);

<span class="code-comment">// Simulate a slow http service (delaying 1 sec) we want
to invoke async
</span>from(<span class="code-quote">"jetty:http:<span class="code-comment">//0.0.0.0:9080/myservice"</span>)
</span>    .delay(1000)
    .transform(constant(<span class="code-quote">"Bye World"</span>))
    .to(<span class="code-quote">"mock:result"</span>);</pre>
</div></div>

<p>And then we have the client API where we call the two routes and we can get the responses
from both of them. As the code is based on unit test there is a bit of mock in there as well:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">MockEndpoint mock = getMockEndpoint(<span class="code-quote">"mock:result"</span>);
<span class="code-comment">// We expect the name job to be faster than the async job
even though the async job
</span><span class="code-comment">// was started first
</span>mock.expectedBodiesReceived(<span class="code-quote">"Claus"</span>,
<span class="code-quote">"Bye World"</span>);

<span class="code-comment">// Send a async request/reply message to the http endpoint
</span>Future <span class="code-keyword">future</span> = template.asyncRequestBody(<span
class="code-quote">"http:<span class="code-comment">//0.0.0.0:9080/myservice"</span>,
<span class="code-quote">"Hello World"</span>);
</span>
<span class="code-comment">// We got the <span class="code-keyword">future</span>
so in the meantime we can <span class="code-keyword">do</span> other stuff, as
<span class="code-keyword">this</span> is Camel
</span><span class="code-comment">// so lets invoke another request/reply route
but <span class="code-keyword">this</span> time is synchronous
</span><span class="code-object">String</span> name = template.requestBody(<span
class="code-quote">"direct:name"</span>, <span class="code-quote">"Give me
a name"</span>, <span class="code-object">String</span>.class);
assertEquals(<span class="code-quote">"Claus"</span>, name);

<span class="code-comment">// Okay we got a name and we have done some other work at
the same time
</span><span class="code-comment">// the async route is running, but now its about
time to wait and get
</span><span class="code-comment">// get the response from the async task
</span>
<span class="code-comment">// We use the extract <span class="code-keyword">future</span>
body to get the response from the <span class="code-keyword">future</span>
</span><span class="code-comment">// (waiting <span class="code-keyword">if</span>
needed) and then <span class="code-keyword">return</span> a string body response.
</span><span class="code-comment">// This allows us to <span class="code-keyword">do</span>
<span class="code-keyword">this</span> in a single code line instead of using
the
</span><span class="code-comment">// JDK Future API to get hold of it, but you
can also use that <span class="code-keyword">if</span> you want
</span><span class="code-object">String</span> response = template.extractFutureBody(<span
class="code-keyword">future</span>, <span class="code-object">String</span>.class);
assertEquals(<span class="code-quote">"Bye World"</span>, response);

assertMockEndpointsSatisfied();</pre>
</div></div>

<p>All together it should give you the basic idea how to use this <a href="/confluence/display/CAMEL/Async"
title="Async">Async</a> API and what it can do.</p>

<h3><a name="Async-UsingtheAsyncDSL"></a>Using the Async DSL</h3>
<p>TODO: About the <tt>async</tt> DSL.</p>


<h3><a name="Async-UsingtheAsyncAPIwiththeCamelclassicAPI"></a>Using the
<a href="/confluence/display/CAMEL/Async" title="Async">Async</a> API with the
Camel classic API</h3>
<p>When using the Camel API to create a producer and send an <a href="/confluence/display/CAMEL/Exchange"
title="Exchange">Exchange</a> we do it like this:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">Endpoint endpoint = context.getEndpoint(<span class="code-quote">"http:<span
class="code-comment">//slowserver.org/myservice"</span>);
</span>Exchange exchange = endpoint.createExchange();
exchange.getIn().setBody(<span class="code-quote">"Order ABC"</span>);
<span class="code-comment">// create a regular producer
</span>Producer producer = endpoint.createProducer();
<span class="code-comment">// send the exchange and wait <span class="code-keyword">for</span>
the reply as <span class="code-keyword">this</span> is synchronous
</span>producer.process(exchange);</pre>
</div></div>

<p>But to do the same with <a href="/confluence/display/CAMEL/Async" title="Async">Async</a>
we need a little help from a helper class, so the code is:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">Endpoint endpoint = context.getEndpoint(<span class="code-quote">"http:<span
class="code-comment">//slowserver.org/myservice"</span>);
</span>Exchange exchange = endpoint.createExchange();
exchange.getIn().setBody(<span class="code-quote">"Order ABC"</span>);
<span class="code-comment">// create a regular producer
</span>Producer producer = endpoint.createProducer();
<span class="code-comment">// normally you will use a shared exectutor service with
pools
</span>ExecutorService executor = Executors.newSingleThreadExecutor();
<span class="code-comment">// send it async with the help of <span class="code-keyword">this</span>
helper
</span>Future&lt;Exchange&gt; <span class="code-keyword">future</span>
= AsyncProcessorHelper.asyncProcess(executor, producer, exchange);
<span class="code-comment">// here we got the <span class="code-keyword">future</span>
handle and we can <span class="code-keyword">do</span> other stuff <span class="code-keyword">while</span>
the exchange is being routed in the other asynchronous thread
</span>...
<span class="code-comment">// and to get the response we use regular Java Concurrency
API
</span>Exchange response = <span class="code-keyword">future</span>.get();</pre>
</div></div>
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