head	1.2;
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1.2
date	2001.08.17.18.17.08;	author leonardr;	state Exp;
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1.1
date	2001.08.01.04.40.43;	author dlr;	state Exp;
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1.2
log
@Cleaned up election irregularities (which required a patch to Spread) and got the TaskRunner working again.
@
text
@/* ================================================================
 * Copyright (c) 2000-2001 CollabNet.  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 acknowlegement: "This product includes
 * software developed by CollabNet (http://www.collab.net/)."
 * Alternately, this acknowlegement may appear in the software itself, if
 * and wherever such third-party acknowlegements normally appear.
 * 
 * 4. The hosted project names must not be used to endorse or promote
 * products derived from this software without prior written
 * permission. For written permission, please contact info@@collab.net.
 * 
 * 5. Products derived from this software may not use the "Tigris" name
 * nor may "Tigris" appear in their names without prior written
 * permission of CollabNet.
 * 
 * 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 COLLAB.NET 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 CollabNet.
 */

package org.tigris.helm.tool.cluster;

import java.util.*;

import spread.SpreadGroup;

import org.apache.turbine.util.Log;

/**
 * Governs cluster-level society.
 * TODO: Add timeout
 *
 * @@author <a href="mailto:dlr@@collab.net">Daniel Rall</a>
 * @@version $Id: Election.java,v 1.1 2001/08/01 04:40:43 dlr Exp $
 */
class Election
{
    private Hashtable members;

    public Election(SpreadGroup[] members)
    {
        this.members = new Hashtable(members.length);
        for (int i = 0; i < members.length; i++)
        {
            this.members.put(members[i], Boolean.FALSE);
        }
    }

    /**
     * Records the electoral bid for the specified member.
     */
    public void recordBid(SpreadGroup member, Float bid)
        throws Exception
    {
        if (!members.containsKey(member))
        {
            throw new Exception
                ("The group " + member 
                 + " is not registered to bid in this election.");
        }
        members.put(member, bid);
    }

    /**
     * Determines whether all bids have been received.
     */
    public final boolean allBidsIn()
    {
        Iterator i = members.values().iterator();
        while (i.hasNext())
        {
            Object val = i.next();
            Log.debug("Member value: " + val);
            if (val == Boolean.FALSE || val == null)
            {
                return false;
            }
        }
        return true;
    }

    /**
     * Decides the winner of this election.
     *
     * @@return The winner.
     */
    public SpreadGroup decision()
    {
        SpreadGroup leadCandidate = null;
        float lowest = Float.MAX_VALUE;
        Enumeration e = members.keys();
        while (e.hasMoreElements())
        {
            SpreadGroup member = (SpreadGroup) e.nextElement();
            float bid = ((Float) members.get(member)).floatValue();
            if (bid < lowest && bid != ClusteredSingletonService.NO_BID)
            {
                lowest = bid;
                leadCandidate = member;
            }
        }
        return leadCandidate;
    }
}
@


1.1
log
@Handles cluster-wide elections.
@
text
@d53 2
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a60 1
 * @@version $Id: ClusterService.java,v 1.14 2001/04/16 22:13:47 dlr Exp $
d79 1
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d99 1
@

