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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><TITLE>LoopbackMessenger (Project JXTA J2SE)</TITLE><META NAME="keywords" CONTENT="net.jxta.impl.endpoint.LoopbackMessenger class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="LoopbackMessenger (Project JXTA J2SE)";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/LoopbackMessenger.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><a href='http://www.jxta.org' target='_blank'>Project JXTA</a></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../net/jxta/impl/endpoint/JxtaMessageMessageElement.html" title="class in net.jxta.impl.endpoint"><B>PREV CLASS</B></A> <A HREF="../../../../net/jxta/impl/endpoint/MessengerPool.html" title="class in net.jxta.impl.endpoint"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="LoopbackMessenger.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">net.jxta.impl.endpoint</FONT><BR>Class LoopbackMessenger</H2><PRE>java.lang.Object <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../net/jxta/impl/endpoint/BasicMessenger.html" title="class in net.jxta.impl.endpoint">net.jxta.impl.endpoint.BasicMessenger</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../net/jxta/impl/endpoint/BlockingMessenger.html" title="class in net.jxta.impl.endpoint">net.jxta.impl.endpoint.BlockingMessenger</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>net.jxta.impl.endpoint.LoopbackMessenger</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../net/jxta/endpoint/EndpointMessenger.html" title="interface in net.jxta.endpoint">EndpointMessenger</A>, <A HREF="../../../../net/jxta/endpoint/Messenger.html" title="interface in net.jxta.endpoint">Messenger</A></DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../net/jxta/impl/endpoint/tls/TlsTransport.TlsLoopbackMessenger.html" title="class in net.jxta.impl.endpoint.tls">TlsTransport.TlsLoopbackMessenger</A></DD></DL><HR><DL><DT>public class <B>LoopbackMessenger</B><DT>extends <A HREF="../../../../net/jxta/impl/endpoint/BlockingMessenger.html" title="class in net.jxta.impl.endpoint">BlockingMessenger</A></DL><P>This class implements local delivery of messages ( for example when the InputPipe and the OutputPipe are located on the same peer) <p/>The reason this class is useful is that it may not always be possible to connect to oneself without actually going to a relay. If your peer is an http client, it is not able to connect to self through the normal http transport. <p/>Since transports cannot be relied on to perform a loopback, some layer above has to figure out that a message is looping back. Since peerid loopback does not explicitly request to go through a real transport, and since peerid addressing is the job of the router, it is the router that performs loopback. <p/>The router could probably perform the lookback by delivering the message to its own input queue, that would take a special transport instead of a special messenger, which is the same kind of deal but would imply some incoming message processing by the router for every message. In contrast, the loopback messenger is setup once and the router will never sees the messages. That's a good optimization. <p/>Alternatively, the endpoint service itself could figure out the loopback, but since the API wants to give a messenger to the requestor rather than just sending a message, the endpoint would have to setup a loopback messenger anyway. So it is pretty much the same. <p/>Anyone with a better way, speak up. J-C<P><P><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) <A HREF="../../../../net/jxta/endpoint/EndpointService.html" title="interface in net.jxta.endpoint">EndpointService</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/endpoint/LoopbackMessenger.html#endpoint">endpoint</A></B></CODE><BR> The endpoint we are working for, ie. that we will loop back to.</TD></TR></TABLE> <A NAME="fields_inherited_from_class_net.jxta.impl.endpoint.BasicMessenger"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class net.jxta.impl.endpoint.<A HREF="../../../../net/jxta/impl/endpoint/BasicMessenger.html" title="class in net.jxta.impl.endpoint">BasicMessenger</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../../net/jxta/impl/endpoint/BasicMessenger.html#closed">closed</A>, <A HREF="../../../../net/jxta/impl/endpoint/BasicMessenger.html#dstAddress">dstAddress</A>, <A HREF="../../../../net/jxta/impl/endpoint/BasicMessenger.html#propertyChangeSupport">propertyChangeSupport</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../../net/jxta/impl/endpoint/LoopbackMessenger.html#LoopbackMessenger(net.jxta.endpoint.EndpointService, net.jxta.endpoint.EndpointAddress, net.jxta.endpoint.EndpointAddress, net.jxta.endpoint.EndpointAddress)">LoopbackMessenger</A></B>(<A HREF="../../../../net/jxta/endpoint/EndpointService.html" title="interface in net.jxta.endpoint">EndpointService</A> ep, <A HREF="../../../../net/jxta/endpoint/EndpointAddress.html" title="class in net.jxta.endpoint">EndpointAddress</A> src, <A HREF="../../../../net/jxta/endpoint/EndpointAddress.html" title="class in net.jxta.endpoint">EndpointAddress</A> dest, <A HREF="../../../../net/jxta/endpoint/EndpointAddress.html" title="class in net.jxta.endpoint">EndpointAddress</A> logicalDest)</CODE><BR> Create a new loopback messenger.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../net/jxta/endpoint/EndpointAddress.html" title="class in net.jxta.endpoint">EndpointAddress</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/endpoint/LoopbackMessenger.html#getLogicalDestinationAddress()">getLogicalDestinationAddress</A></B>()</CODE><BR> Returns the logical destination of this messenger. This may be a different address than is returned by <A HREF="../../../../net/jxta/endpoint/EndpointMessenger.html#getDestinationAddress()"><CODE>getDestinationAddress</CODE></A> and refers to the entity which is located at the destination address. <p/>By analogy, a telephone number would be the destination address, and the owner of that telephone number would be the logical destination. Each logical destination may be known by one or more destination addresses. <p/>By default the logical destination is the same as the destination.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">⌨️ 快捷键说明
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