AgentLivenessChecker.java

/**
 *  Copyright (C) 2008 Progress Software, Inc. All rights reserved.
 *  http://fusesource.com
 *
 *  The software in this package is published under the terms of the AGPL license
 *  a copy of which has been included with this distribution in the license.txt file.
 */
package org.fusesource.cloudmix.common.controller.constraints.agent;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.fusesource.cloudmix.common.controller.AgentController;
import org.fusesource.cloudmix.common.controller.FeatureController;

/**
 * filters an agent list based their assigned feature
 */
public class AgentLivenessChecker implements IAgentConstraintChecker {
    
    private static final transient Log LOG = LogFactory.getLog(AgentLivenessChecker.class);

    public Collection<AgentController> applyConstraint(String profileId,
                                                       FeatureController fc,
                                                       Collection<AgentController> someCandidates) {
        if(LOG.isDebugEnabled())
            LOG.debug("filtering on liveness...");
        List<AgentController> acceptedCandidates;
        
        if (someCandidates == null) {
            acceptedCandidates = new ArrayList<AgentController>(0);
        }
        else if (profileId == null || fc == null || someCandidates.size() == 0) {
            acceptedCandidates = new ArrayList<AgentController>(someCandidates);
        }
        else
        {
            acceptedCandidates = new ArrayList<AgentController>();
            for (AgentController ac : someCandidates) {
                if (!ac.isDeActivated()) {
                    acceptedCandidates.add(ac);
                }
            }
        }
        
        if(LOG.isDebugEnabled())
            LOG.debug("filtered on Liveness: " + acceptedCandidates);
        return acceptedCandidates;
    }
    
    

}