pipebundle.java

Java p2p程序设计2002年版

package net.jxta.impl.shell.bin.ping;

import java.io.*;
import net.jxta.exception.*;
import net.jxta.discovery.*;
import net.jxta.endpoint.*;
import net.jxta.pipe.*;
import net.jxta.peergroup.*;
import net.jxta.document.*;
import net.jxta.id.*;
import net.jxta.protocol.*;
import java.util.*;


/**
 * This class bundles a pipe advertisement with its input
 * and output pipes and their creation methods.
 */
public class PipeBundle {

    private PipeAdvertisement ad;
    private PipeService ps;
    private InputPipe iPipe = null;
    private OutputPipe oPipe = null;
    
    /** Creates new PipeBundle */
    public PipeBundle(PipeAdvertisement ad, PipeService ps) {
        this.ad = ad;
        this.ps = ps;
    }
    
    /**
     * Returns the input pipe associated with this PipeBundle
     */
    public InputPipe getInputPipe()  {
        try {
            if(iPipe==null)
                return (iPipe = (InputPipe)ps.createInputPipe(ad));
            else return iPipe;
        } catch (IOException e) {
            return null;
        }
    }
    
    /**
     * Returns the output pipe associated with this PipeBundle
     */
    public OutputPipe getOutputPipe()  {
        try {
            if(oPipe==null)
                return (oPipe = (OutputPipe)ps.createOutputPipe(ad, 50000));
            else return oPipe;
        } catch (IOException e) {
            return null;
        }
    }
    
    /**
     * Returns the advertisment associated with this PipeBundle
     */
    public PipeAdvertisement getAdvertisement() {
        return ad;
    }
    
}