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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>ModuleClassID (Project JXTA J2SE)</TITLE><META NAME="keywords" CONTENT="net.jxta.platform.ModuleClassID class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="ModuleClassID (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/ModuleClassID.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/platform/JxtaLoader.html" title="class in net.jxta.platform"><B>PREV CLASS</B></A> <A HREF="../../../net/jxta/platform/ModuleSpecID.html" title="class in net.jxta.platform"><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="ModuleClassID.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="#fields_inherited_from_class_net.jxta.id.ID">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: FIELD | <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.platform</FONT><BR>Class ModuleClassID</H2><PRE>java.lang.Object <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../net/jxta/id/ID.html" title="class in net.jxta.id">net.jxta.id.ID</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>net.jxta.platform.ModuleClassID</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable</DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../net/jxta/impl/id/binaryID/ModuleClassBinaryID.html" title="class in net.jxta.impl.id.binaryID">ModuleClassBinaryID</A>, <A HREF="../../../net/jxta/impl/id/UUID/ModuleClassID.html" title="class in net.jxta.impl.id.UUID">ModuleClassID</A></DD></DL><HR><DL><DT>public abstract class <B>ModuleClassID</B><DT>extends <A HREF="../../../net/jxta/id/ID.html" title="class in net.jxta.id">ID</A></DL><P>A ModuleClassID uniquely identifies a particular local behaviour, that is, a specific API for each execution environment for which an implementation exists. <p/>A ModuleClassID has two components: A base class identifier, and a role identifier. The role identifier may be zero. By convention the API uses the ModuleClassID with a zero role identifier to designate the base class in contexts where only the base class is significant. Nonetheless, a ModuleClassID with a zero role identifier is a valid ModulesClassID wherever a full ModuleClassID is expected. In many cases, only one role in a given class is ever used. Using role zero in such cases is an optimization because it may make the string representation of the ModuleClassID shorter. <p/>Each service of a group, that is, the role it plays in the group, is uniquely identified per the group definition. This identifier may be used by other modules in the group to designate this one, or by the service itself to identify its parameters in a PeerAdvertisement. In addition, by combining its PeerGroupID with its own ModuleClassID, a service may create a predictible identifier unique on their peer, suitable for registering listeners with the EndpointService or other services with similar listener interfaces. <p/>The standard PeerGroup implementation of the java reference implementation assigns to each service its ModuleClassID as its unique service identifier. Most of the times this ModuleClassID is a base classID, but groups that use the same Module Class for more than one service (same behaviour but playing a different role in the group, such as, for example, a data base engine with a different data base), may define multiple roles identified by the same base class identifier but different role identifiers. The standard PeerGroup implementation of the java reference implementation has the notion of main application: a default application which may be started automatically upon instantiating the group. This application implements Module and, therefore, is assigned a ModuleClassID. However applications are not expected to play any specific role in the group. As a result, they are assigned a role identifier allocated at run-time as need to garantee local unicity. As a result main applications cannot expect a predictible ClassID. <p/>A ModuleClassID is optionaly described by a published ModuleClassAdvertisement. <p/>There may be any number of embodiements of a module class. These are module specifications. A module specification represent the network behaviour of a module while its class represents its local behaviour. Different groups may use a common subset of classes, for example, the basic set defined by the platform should always be part of it. Each group may use different and network-incompatible specifications for common classes, optimized for various purposes. The local API of a given class on a given JXTA implementation will be invariant per the spec being used. Therefore, the difference will be transparent to applications which do not depend on the possibly different quality of service. <p/>A ModuleSpecID embeds a base class identifier, which permits to verify that a given Module specification is suitable for its intended use.<P><P><DL><DT><B>See Also:</B><DD><A HREF="../../../net/jxta/peergroup/PeerGroup.html" title="interface in net.jxta.peergroup"><CODE>PeerGroup</CODE></A>, <A HREF="../../../net/jxta/platform/Module.html" title="interface in net.jxta.platform"><CODE>Module</CODE></A>, <A HREF="../../../net/jxta/platform/ModuleClassID.html" title="class in net.jxta.platform"><CODE>ModuleClassID</CODE></A>, <A HREF="../../../net/jxta/protocol/PeerAdvertisement.html" title="class in net.jxta.protocol"><CODE>PeerAdvertisement</CODE></A>, <A HREF="../../../net/jxta/protocol/ModuleSpecAdvertisement.html" title="class in net.jxta.protocol"><CODE>ModuleSpecAdvertisement</CODE></A>, <A HREF="../../../net/jxta/protocol/ModuleClassAdvertisement.html" title="class in net.jxta.protocol"><CODE>ModuleClassAdvertisement</CODE></A>, <A HREF="../../../net/jxta/endpoint/EndpointService.html" title="interface in net.jxta.endpoint"><CODE>EndpointService</CODE></A>, <A HREF="../../../net/jxta/id/ID.html" title="class in net.jxta.id"><CODE>ID</CODE></A>, <A HREF="../../../serialized-form.html#net.jxta.platform.ModuleClassID">Serialized Form</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></TABLE> <A NAME="fields_inherited_from_class_net.jxta.id.ID"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class net.jxta.id.<A HREF="../../../net/jxta/id/ID.html" title="class in net.jxta.id">ID</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../net/jxta/id/ID.html#nullID">nullID</A>, <A HREF="../../../net/jxta/id/ID.html#URIEncodingName">URIEncodingName</A>, <A HREF="../../../net/jxta/id/ID.html#URNNamespace">URNNamespace</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/platform/ModuleClassID.html#ModuleClassID()">ModuleClassID</A></B>()</CODE><BR> </TD></TR></TABLE>?? 快捷鍵說明
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