agletstub.java

aglet的部分源码

package com.ibm.aglet;

/*
 * @(#)AgletStub.java
 * 
 * (c) Copyright IBM Corp. 1997, 1998
 * 
 * IBM grants you a non-exclusive, non-transferrable License to
 * use this program internally solely for the purposes of testing
 * and evaluating Java Aglet API.
 * You may not distribute, sublicense, lease, rent or use this
 * sample program externally.
 * 
 * THIS ROGRAM IS PROVIDED "AS IS" WITHOUT ANY WARRANTY EXPRESS OR
 * IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE WARRANTY OF
 * NON-INFRINGEMENT AND THE WARRANTIES OF MERCHANTIBILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.
 * IBM WILL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY YOU AS
 * A RESULT OF USING THIS SAMPLE PROGRAM. IN NO EVENT WILL IBM BE
 * LIABLE FOR ANY SPECIAL, INDIRECT CONSEQUENTIAL DAMAGES OR LOST
 * PROFITS EVEN IF IBM HAS BEEN ADVISED OF THE POSSIBILITY OF THEIR
 * OCCURRENCE OR LOSS OF OR DAMAGE TO YOUR RECORDS OR DATA.
 * IBM WILL NOT BE LIABLE FOR ANY THIRD PARTY CLAIMS AGAINST YOU.
 */

import java.security.Permission;
import java.security.PermissionCollection;

// # import com.ibm.aglets.security.Allowance;
import com.ibm.aglet.event.*;
import java.net.URL;
import java.io.IOException;

/**
 * Abstract class AgletStub is used to implement an aglet behavior.
 * It is not normally used by aglet programmers.
 * 
 * @version     1.30    $Date: 2001/07/28 06:34:00 $
 * @author	Mitsuru Oshima
 * @author	ONO Kouichi
 */
abstract public class AgletStub {

	/*
	 * Constructs AgletProxy
	 */
	protected AgletStub() {}
	/*
	 * Clones the aglet
	 */
	abstract protected Object clone() throws CloneNotSupportedException;
	/*
	 * Deactivates the aglet
	 */
	abstract protected void deactivate(long duration) throws IOException;
	// trip with Ticket
	abstract protected void dispatch(Ticket ticket) 
			throws IOException, RequestRefusedException;
	/*
	 * Dispatches the aglet
	 */
	abstract protected void dispatch(URL url) 
			throws IOException, RequestRefusedException;
	/*
	 * Disposes the aglet
	 */
	abstract protected void dispose();
	/*
	 * Gets the aglet context in which the aglet lives.
	 * @exception InvalidAgletException if the aglet is invalid.
	 */
	abstract protected AgletContext getAgletContext();
	/*
	 * Gets the info
	 */
	abstract protected AgletInfo getAgletInfo();
	/**
	 * Gets the aglet's message manager object.
	 * @see aglet.MessageManager
	 * @return the method manager
	 * @exception InvalidAgletException if the aglet is not valid.
	 */
	abstract protected MessageManager getMessageManager();
	/**
	 * Gets the protections: permission collection about
	 * who can send what kind of messages to the aglet
	 * @return collection of protections about who can send
	 * what kind of messages to the aglet
	 */
	abstract protected PermissionCollection getProtections();
	/**
	 * Gets the current content of the Aglet's message line.
	 * @return the message line.
	 * @exception InvalidAgletException if the aglet is not valid.
	 */
	abstract protected String getText();
	/*
	 * Sets a aglet.
	 */
	abstract protected void setAglet(Aglet aglet);
	// #     /*
	// #      * Gets the allowance: availability of the aglet's resources.
	// #      */
	// #     abstract protected Allowance getAllowance();

	/**
	 * Sets the protections: permission collection about
	 * who can send what kind of messages to the aglet
	 * @param protections collection of protections about who can send
	 * what kind of messages to the aglet
	 */
	abstract protected void setProtections(PermissionCollection protections);
	/**
	 * Sets a aglet's text
	 */
	abstract protected void setText(String text);
	/*
	 * Take a snapshot of the aglet into the 2nd strage. This will be
	 * activated only if the system clashed without being dispatched,
	 * deactivated or disposed.
	 */
	abstract protected void snapshot() throws IOException;
	/*
	 * subscribe the specific multicast message
	 */
	abstract protected void subscribeMessage(String name);
	/*
	 * Suspends the aglet
	 */
	abstract protected void suspend(long duration) 
			throws InvalidAgletException;
	/*
	 * unsubscribe All messages the aglet had been subscribing.
	 */
	abstract protected void unsubscribeAllMessages();
	/*
	 * unsubscribe the message
	 */
	abstract protected boolean unsubscribeMessage(String name);
}