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From conflue...@apache.org
Subject [CONF] Apache Felix: Provided Service Handler (page edited)
Date Mon, 29 Oct 2007 09:56:00 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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</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/FELIX">FELIX</a>
:
            <a href="http://cwiki.apache.org/confluence/display/FELIX/Provided+Service+Handler">Provided
Service Handler</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/FELIX/Provided+Service+Handler">Provided
Service Handler</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~clement.escoffier">Clement
Escoffier</a>
            <span class="smallfont">(Oct 29, 2007)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=27614&originalVersion=7&revisedVersion=8">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><p>This handler allows a component to publish
an OSGi service. It manages:</p>
<ul>
	<li>the service publication</li>
	<li>the component instance / service object creation</li>
	<li>the service unregistering</li>
</ul>


<p><img src="/confluence/download/attachments/27614/ps-simple.png" Handler overview=""
align="absmiddle" border="0" /></p>

<h1><a name="ProvidedServiceHandler-Asimpleexample"></a><b>A simple
example</b></h1>

<p>The following code snippet shows a simple class implementing the FooService interface:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> class FooProviderType1
<span class="code-keyword">implements</span> FooService {
            <span class="code-keyword">private</span> <span class="code-object">String</span>
m_foo = <span class="code-quote">"foo"</span>;

            <span class="code-keyword">public</span> void foo() {
                        <span class="code-object">System</span>.out.println(<span
class="code-quote">"foo  "</span> + m_foo);
            }

}</pre>
</div></div>
<p>To provide a service, the implementation class <b>NEEDS</b> to implement
the service interface. By the way, it guaranties that each methods of the service interface
are implemented.</p>

<p>To provide the service, the component type needs to declare the providing:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;component className=<span
class="code-quote">"...FooProviderType1"</span>&gt;</span>
            <span class="code-tag">&lt;provides/&gt;</span>
<span class="code-tag">&lt;/component&gt;</span></pre>
</div></div>
<p><img src="/confluence/download/attachments/27614/ps-foo.png" align="absmiddle"
border="0" /></p>

<p>The &lt;provides/&gt; element suffice to declare that each instance of this
type will provide the FooService. Indeed, the provided interface can be discovered by analyzing
the implementation class.</p>

<h1><a name="ProvidedServiceHandler-ServicePublication"></a><b>Service
Publication</b></h1>

<p>The provided service handler manages the service publication and providing. For each
declared <em>provides</em>, the handler register a service. The service is published
as long as the instance is valid. If the instance becomes invalid, the service is removed.</p>

<p>By default, it publishes all interfaces implemented by the implementation class of
the component class. It collects all super-interfaces (interfaces implemented by implemented
interfaces and by super class). However it is possible to set exposed interface with the <em>interface</em>
attribute to avoid to exposes all collected interfaces.</p>

<p>The following xml snippet is equivalent to the previous example:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;component className=<span
class="code-quote">"...FooProviderType1"</span>&gt;</span>
            <span class="code-tag">&lt;provides interface=<span class="code-quote">"...FooService
"</span>/&gt;</span>
<span class="code-tag">&lt;/component&gt;</span></pre>
</div></div>
<p>If the implementation class implements several interfaces, all these interfaces are
published by default in the same service publication. You can use the interface attribute
to set exactly published interfaces. If you want to publish several interfaces, you can use
the following syntax:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;component className=<span
class="code-quote">"...FooProviderType1"</span>&gt;</span>
            <span class="code-tag">&lt;provides interface=<span class="code-quote">"{...FooService,
...BarService}"</span>/&gt;</span>
<span class="code-tag">&lt;/component&gt;</span></pre>
</div></div>
<p><img src="/confluence/download/attachments/27614/ps-foobar.png" align="absmiddle"
border="0" /></p>

<p><em>Note</em>: if you use the interface attribute, the handler check
that all declared interface are really implemented by the implementation class. If an interface
is not implemented, the handler throws an error.</p>

<p><em>Note</em>: if the implementation class does not implement any interface,
you cannot provide a service. In this case, the handler throws an error.</p>

<h1><a name="ProvidedServiceHandler-ServiceProperties"></a><b>Service
Properties</b></h1>

<p>The handler can manage service properties. Service properties are attached to published
service and allow consumer to filter providers. A property can be attached to a field (contained
in the component implementation class).</p>

<p>Let's take a new example very closed of the last one:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> class FooProviderType1
<span class="code-keyword">implements</span> FooService {
	<span class="code-keyword">private</span> <span class="code-object">String</span>
m_foo;
	<span class="code-keyword">public</span> void foo() {
		<span class="code-object">System</span>.out.println(<span class="code-quote">"foo
 "</span> + m_foo);
                m_foo = <span class="code-quote">"bar"</span>;
	}
}</pre>
</div></div>
<p>Remark that the m_foo field does not have any value. The following snippet shows
a component publishing the <em>FooService</em>with two properties:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;component className=<span
class="code-quote">"...FooProviderType1"</span>&gt;</span>
            <span class="code-tag">&lt;provides&gt;</span>
                        <span class="code-tag">&lt;property name=<span class="code-quote">"foo"</span>
field=<span class="code-quote">"m_foo"</span> value=<span class="code-quote">"Foo"</span>&gt;</span>
                        <span class="code-tag">&lt;property name=<span class="code-quote">"intProps"</span>
type=<span class="code-quote">"int"</span> value=<span class="code-quote">"5"</span>&gt;</span>
            <span class="code-tag">&lt;/provides&gt;</span>
<span class="code-tag">&lt;/component&gt;</span></pre>
</div></div>
<p>The first declared property will be attached to the &#95;m_foo&#95; field.
This property is published with the name <em>foo</em>. This property has a default
value "Foo". This value will be injected in the &#95;m_foo{_}field, when this field asks
for a value. A property with a field attribute does not need to declare a type (the type can
be discovered by analyzing the implementation class).</p>

<p>The second property is published with the name <em>intProps</em>. This
property is not attached to a field, so, we need to declare the property type. All primitive
types or objects can be used has property type (for object, the qualified name of the class
is used as java.lang.String).</p>

<p><img src="/confluence/download/attachments/27614/ps-foo2.png" align="absmiddle"
border="0" /></p>

<p>The implementation class set a new value to the m_foo field in the code. When this
action occurs, the handler will modify the service publication to update the <em>foo</em>
property published value. If a published property value becomes <em>null</em>,
the property is unpublished since it has a new value.</p>

<p><img src="/confluence/download/attachments/27614/ps-foo3.png" align="absmiddle"
border="0" /></p>

<p>If property does not have default value, the instance configuration needs to set
a value for each unvalued property. Moreover, the instance can override the property value.
The following xml snippet shows the declaration of an instance overriding the property values:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;instance component=<span
class="code-quote">"...FooProviderType1"</span> name=<span class="code-quote">"myFooServiceProvider"</span>&gt;</span>
            <span class="code-tag">&lt;property name=<span class="code-quote">"foo"</span>
value=<span class="code-quote">"baz"</span>/&gt;</span>
            <span class="code-tag">&lt;property name=<span class="code-quote">"intProps"</span>
value=<span class="code-quote">"2"</span>/&gt;</span>
<span class="code-tag">&lt;/instance&gt;</span></pre>
</div></div>
<p><img src="/confluence/download/attachments/27614/ps-foo4.png" align="absmiddle"
border="0" /></p>

<p>Properties can be map of methods too. When a property receive a new value, this method
is called with the new value in parameter. For example, when the foo property receive a new
value (at instance creation or when the instance is reconfigured), the fooMethod is called.
The fooMethod must have only one argument of the Foo type (String in the example).</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;component className=<span
class="code-quote">"...FooProviderType1"</span>&gt;</span>
            <span class="code-tag">&lt;provides&gt;</span>
                        <span class="code-tag">&lt;property name=<span class="code-quote">"foo"</span>
method=<span class="code-quote">"fooMethod"</span> value=<span class="code-quote">"Foo"</span>&gt;</span>
                        <span class="code-tag">&lt;property name=<span class="code-quote">"intProps"</span>
type=<span class="code-quote">"int"</span> value=<span class="code-quote">"5"</span>&gt;</span>
            <span class="code-tag">&lt;/provides&gt;</span>
<span class="code-tag">&lt;/component&gt;</span></pre>
</div></div>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> class FooProviderType1
<span class="code-keyword">implements</span> FooService {
	<span class="code-keyword">private</span> <span class="code-object">String</span>
m_foo;
	<span class="code-keyword">public</span> void foo() {
		<span class="code-object">System</span>.out.println(<span class="code-quote">"foo
 "</span> + m_foo);
	}	void fooMethod(<span class="code-object">String</span> newFoo) {
		m_foo = newFoo;
	}</pre>
</div></div>
<p>A property can declare both a field and a method. In this case, the field receive
the value and then the method is called.&nbsp;</p>
<div class="code"><div class="codeContent">
<pre class="code-java">&lt;component className=<span class="code-quote">"...FooProviderType1"</span>&gt;
            &lt;provides&gt;
                        &lt;property name=<span class="code-quote">"foo"</span>
method=<span class="code-quote">"fooMethod"</span> field=<span class="code-quote">"m_foo"</span>
value=<span class="code-quote">"Foo"</span>&gt;
                        &lt;property name=<span class="code-quote">"intProps"</span>
type=<span class="code-quote">"<span class="code-object">int</span>"</span>
value=<span class="code-quote">"5"</span>&gt;
            &lt;/provides&gt;
&lt;/component&gt;</pre>
</div></div>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> class FooProviderType1
<span class="code-keyword">implements</span> FooService {
	<span class="code-keyword">private</span> <span class="code-object">String</span>
m_foo;
	<span class="code-keyword">public</span> void foo() {
		<span class="code-object">System</span>.out.println(<span class="code-quote">"foo
 "</span> + m_foo);
	}	void fooMethod(<span class="code-object">String</span> newFoo) {
		<span class="code-object">System</span>.out.println(<span class="code-quote">"Update
foo : "</span> + m_foo);
	}</pre>
</div></div>

<h1><a name="ProvidedServiceHandler-Advancedfeatures"></a>Advanced features</h1>


<h2><a name="ProvidedServiceHandler-ServiceServing%26ObjectCreation"></a><b>Service
Serving &amp; Object Creation</b></h2>

<p>When a consumer requires the published service, the handler sends an object (instance)
of the implementation class. By default, it is always the same instance. If no instance already
exists, an instance is created.</p>

<p>However, the handler supports the OSGi <em>ServiceFactory</em>. In this
case, for each requester bundle, the handler sends a new object. To activate this policy,
add the <em>factory</em> attribute in the <em>provides</em> element:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;provides factory=<span
class="code-quote">"SERVICE"</span>/&gt;</span></pre>
</div></div>

<h2><a name="ProvidedServiceHandler-SeveralServiceProviding"></a><b>Several
Service Providing</b></h2>

<p>You can declare several <em>provides</em>inside the same component. All
this provided service will be manage by the same handler but separately. Several services
will be published. This case is useful when service properties are different for the different
services.</p>
<div class="code"><div class="codeContent">
<pre class="code-java">&lt;component className=<span class="code-quote">"...FooProviderType1"</span>&gt;
                &lt;provides <span class="code-keyword">interface</span>=<span
class="code-quote">"...Foo"</span>/&gt;
                &lt;provides <span class="code-keyword">interface</span>=<span
class="code-quote">"...Bar"</span>&gt;
                               &lt;property name=<span class="code-quote">"foo"</span>
value=<span class="code-quote">"baz"</span>/&gt;
                &lt;/provides&gt;
&lt;/component&gt;</pre>
</div></div>
<p><img src="/confluence/download/attachments/27614/ps-foobar2.png" align="absmiddle"
border="0" /></p>

<h2><a name="ProvidedServiceHandler-ServicePropertyPropagation"></a><b>Service
Property Propagation</b></h2>

<p>The configuration handler has the possibility to propagate received properties to
service publication. So, when the propagation is activated, all properties received by the
configuration handler will be propagated to all published service. If some properties are
mapped on methods, these methods are invoked with the new value in argument.</p>

<p><img src="/confluence/download/attachments/27614/ps-propagation.png" align="absmiddle"
border="0" /></p>

<h2><a name="ProvidedServiceHandler-Instancereconfiguration"></a><b>Instance
reconfiguration</b></h2>

<p>The handler supports instance reconfiguration. When an instance is dynamically reconfigured,
if the new configuration updates property values, these value are take into account (both
for field, and service publication). If some of these properties have methods, these methods
are invoked with the new value in argument.</p></div>


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