📄 module.java
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/*
* Copyright (c) 2001 Sun Microsystems, Inc. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Sun Microsystems, Inc. for Project JXTA."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA",
* nor may "JXTA" appear in their name, without prior written
* permission of Sun.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL SUN MICROSYSTEMS OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of Project JXTA. For more
* information on Project JXTA, please see
* <http://www.jxta.org/>.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*
* $Id: Module.java,v 1.4 2001/11/06 07:54:16 jice Exp $
*/
package net.jxta.platform;
import net.jxta.peergroup.PeerGroup;
import net.jxta.document.Advertisement;
import net.jxta.id.ID;
import net.jxta.exception.PeerGroupException;
/**
* This interface defines a JXTA module. All JXTA
* services need to implement this interface. Endpoint protocols and
* applications need to implement that interface if they are to be loaed
* and started by a PeerGroup. Service and Application implements Module,
* PeerGroup implements service and ShellApp implements application, as
* a result both implement Module.
*
* <p>Jxta Modules are given their initialization parameters via the init()
* method rather than a non-default constructor.
*
* <p>Modules are passed the peer group within which they are created.
* From the peergroup object, Modules can acccess all the peer group
* services. The PeerGroup within which a PeerGroup runs is known as its
* parent.
* The initial root peer group is known as the World Peer Group and is
* implemented by an object of class Platform, a subclass of PeerGroup.
* The "parent" PeerGroup of the World Peer Group is null.
*
* @see net.jxta.peergroup.PeerGroup
* @see net.jxta.service.Service
* @see net.jxta.endpoint.EndpointProtocol
* @see net.jxta.platform.Application
* @see net.jxta.platform.ModuleClassID
* @see net.jxta.protocol.ModuleImplAdvertisement
* @see net.jxta.id.ID
* @see net.jxta.document.Advertisement
*
* @version $Revision: 1.4 $
* @since JXTA 1.0
*/
public interface Module {
/**
* Initialize the module, passing it its peer group and advertisement.
*
* @param group The PeerGroup from which this Module can obtain services.
* If this module is a service, this is also the PeerGroup of which this
* module is a service.
* @param assignedID Identity of Module within group.
* modules can use it as a the root of their namespace to create
* names that are unique within the group but predictible by the
* same module on another peer. This is normaly the ModuleClassID
* which is also the name under which the module is known by other
* modules. For a group it is the PeerGroupID itself.
* The parameters of a service, in the Peer configuration, are indexed
* by the assignedID of that service, and a Service must publish its
* run-time parameters in the Peer Advertisement under its assigned ID.
* @param implAdv The implementation advertisement for this Module.
*
* @exception PeerGroupException This module failed to initialize.
*
* @since JXTA 1.0
*/
public void init(PeerGroup group,
ID assignedID,
Advertisement implAdv)
throws PeerGroupException;
/**
* Some Modules will wait for start() being called, before proceeding
* beyond a certain point. That's also the opportunity to supply
* harbitrary arguments (mostly to applications).
*
* Note: the name of this method is historical and no-longer adequate.
*
* @param args An array of Strings forming the parameters for this
* Module.
*
* @return int status indication. By convention 0 means that this Module
* started succesfully.
*/
public int startApp(String[] args);
/**
* One can ask a Module to stop.
* The Module cannot be forced to comply, but in the future
* we might be able to deny it access to anything after some timeout.
*
* Note: the name of this method is no-longer adequate.
*/
public void stopApp();
}
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