<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html xmlns:fn="http://www.w3.org/2005/02/xpath-functions"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link rel="stylesheet" href="../../../../doc/otp_doc.css" type="text/css"> <title>Erlang -- The Notification Service Components</title> </head> <body bgcolor="white" text="#000000" link="#0000ff" vlink="#ff00ff" alink="#ff0000"><div id="container"> <script id="js" type="text/javascript" language="JavaScript" src="../../../../doc/js/flipmenu/flipmenu.js"></script><script id="js2" type="text/javascript" src="../../../../doc/js/erlresolvelinks.js"></script><script language="JavaScript" type="text/javascript"> <!-- function getWinHeight() { var myHeight = 0; if( typeof( window.innerHeight ) == 'number' ) { //Non-IE myHeight = window.innerHeight; } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) { //IE 6+ in 'standards compliant mode' myHeight = document.documentElement.clientHeight; } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) { //IE 4 compatible myHeight = document.body.clientHeight; } return myHeight; } function setscrollpos() { var objf=document.getElementById('loadscrollpos'); document.getElementById("leftnav").scrollTop = objf.offsetTop - getWinHeight()/2; } function addEvent(obj, evType, fn){ if (obj.addEventListener){ obj.addEventListener(evType, fn, true); return true; } else if (obj.attachEvent){ var r = obj.attachEvent("on"+evType, fn); return r; } else { return false; } } addEvent(window, 'load', setscrollpos); //--></script><div id="leftnav"><div class="innertube"> <img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/cosNotification-1.1.13.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>cosNotification</strong><br><strong>User's Guide</strong><br><small>Version 1.1.13</small></p> <br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Chapters</strong></small></p> <ul class="flipMenu" imagepath="../../../../doc/js/flipmenu"> <li id="no" title="The cosNotification Application" expanded="false">The cosNotification Application<ul> <li><a href="ch-contents.html"> Top of chapter </a></li> <li title="Content Overview"><a href="ch-contents.html#id2258552">Content Overview</a></li> <li title="Brief Description of the User's Guide"><a href="ch-contents.html#id2252685">Brief Description of the User's Guide</a></li> </ul> </li> <li id="no" title="Introduction to cosNotification" expanded="false">Introduction to cosNotification<ul> <li><a href="ch_introduction.html"> Top of chapter </a></li> <li title="Overview"><a href="ch_introduction.html#id2252655">Overview</a></li> </ul> </li> <li id="no" title="Installing cosNotification" expanded="false">Installing cosNotification<ul> <li><a href="ch-install.html"> Top of chapter </a></li> <li title="Installation Process "><a href="ch-install.html#id2251685">Installation Process </a></li> </ul> </li> <li id="loadscrollpos" title="The Notification Service Components" expanded="true">The Notification Service Components<ul> <li><a href="ch_system.html"> Top of chapter </a></li> <li title="The Notification Service Components"><a href="ch_system.html#id2255257">The Notification Service Components</a></li> </ul> </li> <li id="no" title="Filters and the Constraint Language BNF" expanded="false">Filters and the Constraint Language BNF<ul> <li><a href="ch_BNF.html"> Top of chapter </a></li> <li title="Filters and the Constraint Language BNF"><a href="ch_BNF.html#id2252133">Filters and the Constraint Language BNF</a></li> </ul> </li> <li id="no" title="Quality Of Service and Admin Properties" expanded="false">Quality Of Service and Admin Properties<ul> <li><a href="ch_QoS.html"> Top of chapter </a></li> <li title="Quality Of Service and Admin Properties"><a href="ch_QoS.html#id2260951">Quality Of Service and Admin Properties</a></li> </ul> </li> <li id="no" title="cosNotification Examples" expanded="false">cosNotification Examples<ul> <li><a href="ch_example.html"> Top of chapter </a></li> <li title="A Tutorial on How to Create a Simple Service"><a href="ch_example.html#id2262360">A Tutorial on How to Create a Simple Service</a></li> </ul> </li> </ul> </div></div> <div id="content"> <div class="innertube"> <h1>4 The Notification Service Components</h1> <h3><a name="id2255257">4.1 The Notification Service Components</a></h3> <p>This chapter describes the Notification Service Components and how they interact.</p> <h4>Components</h4> <p>There are seven components in the OMG Notification Service architecture. These are described below: </p> <a name="notificationFlow"></a> <img alt="IMAGE MISSING" src="notificationFlow.gif"><br> <em>Figure 4.1: Figure 1: The Notification Service Components.</em> <ul> <li> <strong>Event Channel:</strong> acts as a factory for Administrator objects. Allows clients to set Administrative Properties.</li> <li> <strong>Supplier Administrators:</strong> acts as a factory for Proxy Consumers. Administrators are started as <span class="code">'AND_OP'-</span> or <span class="code">'OR_OP'-</span>type, which determines if events must be validated using both the Administrators associated Filter and/or its Proxy children Filters.</li> <li> <strong>Consumer Administrators:</strong> acts in the same way as Supplier Administrators but handle Proxy Suppliers.</li> <li> <strong>Consumer Proxy:</strong> is connected to a client application. Can be started as <span class="code">Pull</span> or <span class="code">Push</span> object. If the proxy is Push style the client application must push events to the Proxy, otherwise the Proxy is supposed to Pull events. The <span class="code">CosNotification::AdminProperties</span> is used to set the pacing interval.</li> <li> <strong>Supplier Proxy:</strong> Acts in a similar way as the Consumer Proxy, but if started as a <span class="code">Push</span> proxy it will push events to the client application.</li> <li> <strong>Filters:</strong> used to filter events. May be associated with Proxies and Administrators.</li> <li> <strong>Mapping Filters:</strong> used to override events Quality of Service settings. Can only be associated with Consumer Administrators and Proxy Suppliers.</li> </ul> <p>When a Proxy is started it is set to accept <span class="code">CORBA::Any</span>, <span class="code">CosNotification::StructuredEvent</span> or <span class="code">CosNotification::EventBatch</span> (a sequence of structured events).</p> <p>If a Proxy is supposed to deliver structured events to a client application and receives an <span class="code">CORBA::Any</span> event, the event is converted to a structured event with <span class="code">type_name</span> set to <span class="code">"%ANY"</span> and the event is stored in <span class="code">remainder_of_body</span>.</p> <p>If a Proxy is supposed to deliver <span class="code">CORBA::Any</span> events to a client application and receives a structured event, the event is stored in an Any type. The Any Type Code will be equal to the <span class="code">CosNotification::StructuredEvent</span> Type Code.</p> </div> <div class="footer"> <hr> <p>Copyright © 2000-2010 Ericsson AB. All Rights Reserved.</p> </div> </div> </div></body> </html>