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     <h1>Multipoint (TCP) Discovery

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 <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>

 <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>

 <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>

 <p>The entire process is essentially the art of using a statically maintained
 list to bootstrap getting the more valuable dynamically maintained list.</p>

 <h1>Server Configuration</h1>

 <p>In the server this list can be specified via the
 <code>conf/multipoint.properties</code> file like so:</p>

 <pre><code>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>

 <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>

 <h1>Client Configuration</h1>

 <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>

 <pre><code>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>

 <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>

 <pre><code>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>

 <p>If the server at <code>192.168.1.20:4201</code> supports failover, so will the client.</p>

 <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>


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	<h1>Multipoint (TCP) Discovery

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	<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>

	<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>

	<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>

	<p>The entire process is essentially the art of using a statically maintained
	list to bootstrap getting the more valuable dynamically maintained list.</p>

	<h1>Server Configuration</h1>

	<p>In the server this list can be specified via the
	<code>conf/multipoint.properties</code> file like so:</p>

	<pre><code>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>

	<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>

	<h1>Client Configuration</h1>

	<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>

	<pre><code>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>

	<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>

	<pre><code>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>

	<p>If the server at <code>192.168.1.20:4201</code> supports failover, so will the client.</p>

	<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>




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