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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>DiscoveryServiceImpl (Project JXTA J2SE)</TITLE><META NAME="keywords" CONTENT="net.jxta.impl.discovery.DiscoveryServiceImpl class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="DiscoveryServiceImpl (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/DiscoveryServiceImpl.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"> PREV CLASS <A HREF="../../../../net/jxta/impl/discovery/DiscoveryServiceInterface.html" title="class in net.jxta.impl.discovery"><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="DiscoveryServiceImpl.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.discovery</FONT><BR>Class DiscoveryServiceImpl</H2><PRE>java.lang.Object <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>net.jxta.impl.discovery.DiscoveryServiceImpl</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../net/jxta/discovery/DiscoveryService.html" title="interface in net.jxta.discovery">DiscoveryService</A>, java.util.EventListener, <A HREF="../../../../net/jxta/platform/Module.html" title="interface in net.jxta.platform">Module</A>, <A HREF="../../../../net/jxta/resolver/QueryHandler.html" title="interface in net.jxta.resolver">QueryHandler</A>, <A HREF="../../../../net/jxta/rendezvous/RendezvousListener.html" title="interface in net.jxta.rendezvous">RendezvousListener</A>, <A HREF="../../../../net/jxta/service/Service.html" title="interface in net.jxta.service">Service</A>, <A HREF="../../../../net/jxta/impl/cm/Srdi.SrdiInterface.html" title="interface in net.jxta.impl.cm">Srdi.SrdiInterface</A>, <A HREF="../../../../net/jxta/resolver/SrdiHandler.html" title="interface in net.jxta.resolver">SrdiHandler</A></DD></DL><HR><DL><DT>public class <B>DiscoveryServiceImpl</B><DT>extends java.lang.Object<DT>implements <A HREF="../../../../net/jxta/discovery/DiscoveryService.html" title="interface in net.jxta.discovery">DiscoveryService</A>, <A HREF="../../../../net/jxta/resolver/QueryHandler.html" title="interface in net.jxta.resolver">QueryHandler</A>, <A HREF="../../../../net/jxta/rendezvous/RendezvousListener.html" title="interface in net.jxta.rendezvous">RendezvousListener</A>, <A HREF="../../../../net/jxta/resolver/SrdiHandler.html" title="interface in net.jxta.resolver">SrdiHandler</A>, <A HREF="../../../../net/jxta/impl/cm/Srdi.SrdiInterface.html" title="interface in net.jxta.impl.cm">Srdi.SrdiInterface</A></DL><P>This Discovery Service implementation provides a mechanism to discover peers within the horizon of the resolver service. The horizon is normally restricted to the group's boundaries but this is not an absolute requirement. Use of the Resolver service is not an absolute requirement either for a discovery service, but this is what this is part of the platform and default net peer group protocol set, which this code implements. <p/>This implementation uses the standard JXTA Peer Discovery Protocol (PDP). <p/>The DiscoveryService service also provides a way to obtain information from a specified peer and request other peer advertisements, this method is particularly useful in the case of a portal where new relationships may be established starting from a predetermined peer (perhaps described in address book, or through an invitation)<P><P><DL><DT><B>See Also:</B><DD><A HREF="../../../../net/jxta/discovery/DiscoveryService.html" title="interface in net.jxta.discovery"><CODE>DiscoveryService</CODE></A>, <A HREF="../../../../net/jxta/protocol/DiscoveryQueryMsg.html" title="class in net.jxta.protocol"><CODE>DiscoveryQueryMsg</CODE></A>, <A HREF="../../../../net/jxta/impl/protocol/DiscoveryQuery.html" title="class in net.jxta.impl.protocol"><CODE>DiscoveryQuery</CODE></A>, <A HREF="../../../../net/jxta/protocol/DiscoveryResponseMsg.html" title="class in net.jxta.protocol"><CODE>DiscoveryResponseMsg</CODE></A>, <A HREF="../../../../net/jxta/impl/protocol/DiscoveryResponse.html" title="class in net.jxta.impl.protocol"><CODE>DiscoveryResponse</CODE></A>, <A HREF="../../../../net/jxta/resolver/ResolverService.html" title="interface in net.jxta.resolver"><CODE>ResolverService</CODE></A>, <a href="http://spec.jxta.org/nonav/v1.0/docbook/JXTAProtocols.html#proto-pdp" target="_blank">JXTA Protocols Specification : Peer Discovery Protocol</a></DL><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>protected <A HREF="../../../../net/jxta/impl/cm/Cm.html" title="class in net.jxta.impl.cm">Cm</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/discovery/DiscoveryServiceImpl.html#cm">cm</A></B></CODE><BR> The cache manager we're going to use to cache jxta advertisements</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static java.lang.String[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/discovery/DiscoveryServiceImpl.html#dirname">dirname</A></B></CODE><BR> adv types</TD></TR></TABLE> <A NAME="fields_inherited_from_class_net.jxta.discovery.DiscoveryService"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface net.jxta.discovery.<A HREF="../../../../net/jxta/discovery/DiscoveryService.html" title="interface in net.jxta.discovery">DiscoveryService</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../../net/jxta/discovery/DiscoveryService.html#ADV">ADV</A>, <A HREF="../../../../net/jxta/discovery/DiscoveryService.html#DEFAULT_EXPIRATION">DEFAULT_EXPIRATION</A>, <A HREF="../../../../net/jxta/discovery/DiscoveryService.html#DEFAULT_LIFETIME">DEFAULT_LIFETIME</A>, <A HREF="../../../../net/jxta/discovery/DiscoveryService.html#GROUP">GROUP</A>, <A HREF="../../../../net/jxta/discovery/DiscoveryService.html#INFINITE_LIFETIME">INFINITE_LIFETIME</A>, <A HREF="../../../../net/jxta/discovery/DiscoveryService.html#NO_EXPIRATION">NO_EXPIRATION</A>, <A HREF="../../../../net/jxta/discovery/DiscoveryService.html#PEER">PEER</A></CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_net.jxta.platform.Module"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface net.jxta.platform.<A HREF="../../../../net/jxta/platform/Module.html" title="interface in net.jxta.platform">Module</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../../net/jxta/platform/Module.html#START_AGAIN_PROGRESS">START_AGAIN_PROGRESS</A>, <A HREF="../../../../net/jxta/platform/Module.html#START_AGAIN_STALLED">START_AGAIN_STALLED</A>, <A HREF="../../../../net/jxta/platform/Module.html#START_OK">START_OK</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/discovery/DiscoveryServiceImpl.html#DiscoveryServiceImpl()">DiscoveryServiceImpl</A></B>()</CODE><BR> </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> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/discovery/DiscoveryServiceImpl.html#addDiscoveryListener(net.jxta.discovery.DiscoveryListener)">addDiscoveryListener</A></B>(<A HREF="../../../../net/jxta/discovery/DiscoveryListener.html" title="interface in net.jxta.discovery">DiscoveryListener</A> listener)</CODE><BR> register a discovery listener, to notified on discovery events</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/discovery/DiscoveryServiceImpl.html#flushAdvertisement(net.jxta.document.Advertisement)">flushAdvertisement</A></B>(<A HREF="../../../../net/jxta/document/Advertisement.html" title="class in net.jxta.document">Advertisement</A> adv)</CODE><BR> flush a stored Advertisement</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/discovery/DiscoveryServiceImpl.html#flushAdvertisements(java.lang.String, int)">flushAdvertisements</A></B>(java.lang.String id, int type)</CODE><BR> flushs stored Advertisement(s),</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../net/jxta/impl/discovery/DiscoveryServiceImpl.html#getAdvExpirationTime(net.jxta.document.Advertisement)">getAdvExpirationTime</A></B>(<A HREF="../../../../net/jxta/document/Advertisement.html" title="class in net.jxta.document">Advertisement</A> adv)</CODE><BR> Returns the maximum duration in milliseconds for which this document should be cached by those other than the publisher. This value is either the cache lifetime or the remaining lifetime of the document, whichever is less.</TD></TR>⌨️ 快捷键说明
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