Quadcap Embeddable Server

com/quadcap/pop3/client/Agent.java

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package com.quadcap.pop3.client;

/* Copyright 1997 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.util.Date;
import java.util.Hashtable;
import java.util.Vector;

import java.io.IOException;
import java.io.InputStream;

import com.quadcap.util.Debug;

import com.quadcap.util.threads.Command;

/**
 * This simple Pop3 agent transfers all new messages in a remote Pop3
 * mailbox into the specified folder in the quadcap message store.
 *
 * <p>A more sophisticated agent would scan the headers first and apply
 * filters to certain messages without having to fetch the bodies.
 *
 * @author Stan Bailes
 */
public class Agent implements Runnable {
    String                      host;
    String                      user;
    String                      password;
    Session                     pop3                    = null;

    /**
     * Create a new Agent with the specified profile name
     *
     * @param profileName the name of the profile.
     */
    public Agent(String host, String user, String password) {
        this.host = host;
        this.user = user;
        this.password = password;
    }

    /**
     * The Command callback object which invokes this agent.
     */
    public void run() {
        Debug.println("[" + user + "] begin");
        try {
            if (pop3 == null) pop3 = new Session(host, 110);
            pop3.connect();

            if (pop3.user(user) != Session.OK) {
                throw new IOException("user failed: " + user);
            }
            if (pop3.pass(password) != Session.OK) {
                throw new IOException("password failed: " + user);
            }
            getAndDeleteMail();
        } catch (IOException e) {
            Debug.print(e);
                                     
        } finally {
            try {
                pop3.quit();
            } catch (IOException e) {
                Debug.print(e);
            }
            // ---- we're about to "go to sleep", potentially for a long time,
            // ---- so allow these objects to be gc'ed.
            pop3 = null;
        }
        Debug.println("[" + user + "] done");
    }

    /**
     * The simple <i>delete from server</i> case.  Get all of the mail,
     * put it in the right folder, then delete it from the server.
     */
    void getAndDeleteMail() throws IOException {
        Vector r = pop3.stat();
        int cnt = Integer.parseInt(r.elementAt(1).toString());
        byte[] buf = new byte[16384];
        for (int i = 1; i <= cnt; i++) {
            Debug.println("[" + user + "] getting message " + i);
            InputStream is = pop3.retr(i);
            if (is != null) {
                int xcnt = 0;
                while ((xcnt = is.read(buf)) > 0) continue;
                is.close();
            }
            pop3.dele(i);
        }
        Debug.println("[" + user + "] deleted " + cnt + " messages");
    }

    public static void main(String[] args) {
        while (true) {
            for (int i = 0; i < 100; i++) {
                Agent agent = new Agent("nt1", "stan"+i, "stan"+i);
                agent.run();
            }
        }
    }
}