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OtpEpmd (Java-Erlang Interface Library)
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com.ericsson.otp.erlang</FONT>
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Class OtpEpmd</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.ericsson.otp.erlang.OtpEpmd</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>OtpEpmd</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
Provides methods for registering, unregistering and looking up nodes with the
Erlang portmapper daemon (Epmd). For each registered node, Epmd maintains
information about the port on which incoming connections are accepted, as
well as which versions of the Erlang communication protocolt the node
supports.
<p>
Nodes wishing to contact other nodes must first request information from Epmd
before a connection can be set up, however this is done automatically by
<A HREF="../../../../com/ericsson/otp/erlang/OtpSelf.html#connect(com.ericsson.otp.erlang.OtpPeer)"><CODE>OtpSelf.connect()</CODE></A> when necessary.
<p>
The methods <A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#publishPort(com.ericsson.otp.erlang.OtpLocalNode)"><CODE>publishPort()</CODE></A> and
<A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#unPublishPort(com.ericsson.otp.erlang.OtpLocalNode)"><CODE>unPublishPort()</CODE></A> will fail if an Epmd
process is not running on the localhost. Additionally
<A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#lookupPort(com.ericsson.otp.erlang.AbstractNode)"><CODE>lookupPort()</CODE></A> will fail if there is no Epmd
process running on the host where the specified node is running. See the
Erlang documentation for information about starting Epmd.
<p>
This class contains only static methods, there are no constructors.
<P>
<P>
<HR>
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<CODE>static java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#lookupNames()">lookupNames</A></B>()</CODE>
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<CODE>static java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#lookupNames(java.net.InetAddress)">lookupNames</A></B>(java.net.InetAddress address)</CODE>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#lookupPort(com.ericsson.otp.erlang.AbstractNode)">lookupPort</A></B>(<A HREF="../../../../com/ericsson/otp/erlang/AbstractNode.html" title="class in com.ericsson.otp.erlang">AbstractNode</A> node)</CODE>
<BR>
Determine what port a node listens for incoming connections on.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#publishPort(com.ericsson.otp.erlang.OtpLocalNode)">publishPort</A></B>(<A HREF="../../../../com/ericsson/otp/erlang/OtpLocalNode.html" title="class in com.ericsson.otp.erlang">OtpLocalNode</A> node)</CODE>
<BR>
Register with Epmd, so that other nodes are able to find and connect to
it.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#unPublishPort(com.ericsson.otp.erlang.OtpLocalNode)">unPublishPort</A></B>(<A HREF="../../../../com/ericsson/otp/erlang/OtpLocalNode.html" title="class in com.ericsson.otp.erlang">OtpLocalNode</A> node)</CODE>
<BR>
Unregister from Epmd.</TD>
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<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/ericsson/otp/erlang/OtpEpmd.html#useEpmdPort(int)">useEpmdPort</A></B>(int port)</CODE>
<BR>
Set the port number to be used to contact the epmd process.</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="useEpmdPort(int)"><!-- --></A><H3>
useEpmdPort</H3>
<PRE>
public static void <B>useEpmdPort</B>(int port)</PRE>
<DL>
<DD>Set the port number to be used to contact the epmd process.
Only needed when the default port is not desired and system environment
variable ERL_EPMD_PORT can not be read (applet).
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="lookupPort(com.ericsson.otp.erlang.AbstractNode)"><!-- --></A><H3>
lookupPort</H3>
<PRE>
public static int <B>lookupPort</B>(<A HREF="../../../../com/ericsson/otp/erlang/AbstractNode.html" title="class in com.ericsson.otp.erlang">AbstractNode</A> node)
throws java.io.IOException</PRE>
<DL>
<DD>Determine what port a node listens for incoming connections on.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the listen port for the specified node, or 0 if the node was not
registered with Epmd.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there was no response from the name server.</DL>
</DD>
</DL>
<HR>
<A NAME="publishPort(com.ericsson.otp.erlang.OtpLocalNode)"><!-- --></A><H3>
publishPort</H3>
<PRE>
public static boolean <B>publishPort</B>(<A HREF="../../../../com/ericsson/otp/erlang/OtpLocalNode.html" title="class in com.ericsson.otp.erlang">OtpLocalNode</A> node)
throws java.io.IOException</PRE>
<DL>
<DD>Register with Epmd, so that other nodes are able to find and connect to
it.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>node</CODE> - the server node that should be registered with Epmd.
<DT><B>Returns:</B><DD>true if the operation was successful. False if the node was
already registered.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if there was no response from the name server.</DL>
</DD>
</DL>
<HR>
<A NAME="unPublishPort(com.ericsson.otp.erlang.OtpLocalNode)"><!-- --></A><H3>
unPublishPort</H3>
<PRE>
public static void <B>unPublishPort</B>(<A HREF="../../../../com/ericsson/otp/erlang/OtpLocalNode.html" title="class in com.ericsson.otp.erlang">OtpLocalNode</A> node)</PRE>
<DL>
<DD>Unregister from Epmd. Other nodes wishing to connect will no longer be
able to.
<p>
This method does not report any failures.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="lookupNames()"><!-- --></A><H3>
lookupNames</H3>
<PRE>
public static java.lang.String[] <B>lookupNames</B>()
throws java.io.IOException</PRE>
<DL>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="lookupNames(java.net.InetAddress)"><!-- --></A><H3>
lookupNames</H3>
<PRE>
public static java.lang.String[] <B>lookupNames</B>(java.net.InetAddress address)
throws java.io.IOException</PRE>
<DL>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE></DL>
</DD>
</DL>
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