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     <div id="main-block" class="container main-block">
         <div class="row title">
           <div class="col-md-12">
             <div class='page-header'>

               <h1>Multipoint (TCP) Discovery</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div id="preamble">
 <div class="sectionbody">
 <div class="paragraph">
 <p>As TCP has no real broadcast functionality to speak of, communication of
 who is in the network is achieved by each server having a physical
 connection to each other server in the network.</p>
 </div>
 <div class="paragraph">
 <p>To join the network, the server must be configured to know the address
 of at least one server in the network and connect to it. When it does
 both servers will exchange the full list of all the other servers each
 knows about. Each server will then connect to any new servers they&#8217;ve
 just learned about and repeat the processes with those new servers. The
 end result is that everyone has a direct connection to everyone 100% of
 the time, hence the made-up term "multipoint" to describe this situation
 of each server having multiple point-to-point connections which create a
 fully connected graph.</p>
 </div>
 <div class="paragraph">
 <p>On the client side things are similar. It needs to know the address of
 at least one server in the network and be able to connect to it. When it
 does it will get the full (and dynamically maintained) list of every
 server in the network. The client doesn&#8217;t connect to each of those
 servers immediately, but rather consults the list in the event of a
 failover, using it to decide who to connect to next.</p>
 </div>
 <div class="paragraph">
 <p>The entire process is essentially the art of using a statically
 maintained list to bootstrap getting the more valuable dynamically
 maintained list.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_server_configuration">Server Configuration</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>In the server this list can be specified via the
 <code>conf/multipoint.properties</code> file like so:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-properties" data-lang="properties">server      = org.apache.openejb.server.discovery.MultipointDiscoveryAgent
 bind        = 127.0.0.1
 port        = 4212
 disabled    = false
 initialServers = 192.168.1.20:4212, 192.168.1.30:4212, 192.168.1.40:4212</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>The above configuration shows the server has an <code>port</code> <code>4212</code> open for
 connections by other servers for multipoint communication. The
 <code>initialServers</code> list should be a comma separated list of other similar
 servers on the network. Only one of the servers listed is required to be
 running when this server starts up&#8201;&#8212;&#8201;it is not required to list all
 servers in the network.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_client_configuration">Client Configuration</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Configuration in the client is similar, but note that EJB clients do not
 participate directly in multipoint communication and do <strong>not</strong> connect to
 the multipoint port. The server list is simply a list of the regular
 <code>ejbd://</code> urls that a client normally uses to connect to a server.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">Properties p = new Properties();
 p.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
 p.put(Context.PROVIDER_URL, "failover:ejbd://192.168.1.20:4201,ejbd://192.168.1.30:4201");
 InitialContext remoteContext = new InitialContext(p);</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>Failover can work entirely driven by the server, the client does not
 need to be configured to participate. A client can connect as usual to
 the server.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">Properties p = new Properties();
 p.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
 p.put(Context.PROVIDER_URL, "ejbd://192.168.1.20:4201");
 InitialContext remoteContext = new InitialContext(p);</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>If the server at <code>192.168.1.20:4201</code> supports failover, so will the
 client.</p>
 </div>
 <div class="paragraph">
 <p>In this scenario the list of servers used for failover is supplied
 entirely by the server at <code>192.168.1.20:4201</code>. The server could have
 aquired the list via multicast or multipoint (or both), but this detail
 is not visible to the client.</p>
 </div>
 </div>
 </div>
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	<div id="main-block" class="container main-block">
	<div class="row title">
	<div class="col-md-12">
	<div class='page-header'>

	<h1>Multipoint (TCP) Discovery</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div id="preamble">
	<div class="sectionbody">
	<div class="paragraph">
	<p>As TCP has no real broadcast functionality to speak of, communication of
	who is in the network is achieved by each server having a physical
	connection to each other server in the network.</p>
	</div>
	<div class="paragraph">
	<p>To join the network, the server must be configured to know the address
	of at least one server in the network and connect to it. When it does
	both servers will exchange the full list of all the other servers each
	knows about. Each server will then connect to any new servers they’ve
	just learned about and repeat the processes with those new servers. The
	end result is that everyone has a direct connection to everyone 100% of
	the time, hence the made-up term "multipoint" to describe this situation
	of each server having multiple point-to-point connections which create a
	fully connected graph.</p>
	</div>
	<div class="paragraph">
	<p>On the client side things are similar. It needs to know the address of
	at least one server in the network and be able to connect to it. When it
	does it will get the full (and dynamically maintained) list of every
	server in the network. The client doesn’t connect to each of those
	servers immediately, but rather consults the list in the event of a
	failover, using it to decide who to connect to next.</p>
	</div>
	<div class="paragraph">
	<p>The entire process is essentially the art of using a statically
	maintained list to bootstrap getting the more valuable dynamically
	maintained list.</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_server_configuration">Server Configuration</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>In the server this list can be specified via the
	<code>conf/multipoint.properties</code> file like so:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-properties" data-lang="properties">server = org.apache.openejb.server.discovery.MultipointDiscoveryAgent
	bind = 127.0.0.1
	port = 4212
	disabled = false
	initialServers = 192.168.1.20:4212, 192.168.1.30:4212, 192.168.1.40:4212</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>The above configuration shows the server has an <code>port</code> <code>4212</code> open for
	connections by other servers for multipoint communication. The
	<code>initialServers</code> list should be a comma separated list of other similar
	servers on the network. Only one of the servers listed is required to be
	running when this server starts up — it is not required to list all
	servers in the network.</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_client_configuration">Client Configuration</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>Configuration in the client is similar, but note that EJB clients do not
	participate directly in multipoint communication and do <strong>not</strong> connect to
	the multipoint port. The server list is simply a list of the regular
	<code>ejbd://</code> urls that a client normally uses to connect to a server.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">Properties p = new Properties();
	p.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
	p.put(Context.PROVIDER_URL, "failover:ejbd://192.168.1.20:4201,ejbd://192.168.1.30:4201");
	InitialContext remoteContext = new InitialContext(p);</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Failover can work entirely driven by the server, the client does not
	need to be configured to participate. A client can connect as usual to
	the server.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">Properties p = new Properties();
	p.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
	p.put(Context.PROVIDER_URL, "ejbd://192.168.1.20:4201");
	InitialContext remoteContext = new InitialContext(p);</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>If the server at <code>192.168.1.20:4201</code> supports failover, so will the
	client.</p>
	</div>
	<div class="paragraph">
	<p>In this scenario the list of servers used for failover is supplied
	entirely by the server at <code>192.168.1.20:4201</code>. The server could have
	aquired the list via multicast or multipoint (or both), but this detail
	is not visible to the client.</p>
	</div>
	</div>
	</div>
	</div>

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