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generic watchdog implementation keeping dependent threads alive

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package org.csc.phynixx.watchdog;

/*
 * #%L
 * phynixx-watchdog
 * %%
 * Copyright (C) 2014 csc
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */


import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class NotificationCondition implements IWatchedCondition {


    public static interface IConditionNotifier {

        void notifyCondition(IWatchedCondition cond);
    }

    private List notifiers = new ArrayList();

    private boolean active = false;

    private boolean useless = false;

    public synchronized boolean isActive() {
        return active;
    }

    public synchronized void setActive(boolean active) {
        this.active = active;
    }

    public boolean checkCondition() {
        return true;
    }

    public void conditionViolated() {
    }


    public void addNotifier(IConditionNotifier notifier) {
        if (!this.notifiers.contains(notifier)) {
            this.notifiers.add(notifier);
        }
    }


    protected void notifyCondition() {

        for (Iterator iterator = notifiers.iterator(); iterator.hasNext(); ) {
            IConditionNotifier notifier = (IConditionNotifier) iterator.next();
            notifier.notifyCondition(this);
        }
    }


    public String toString() {
        return "NotificationCondition ; has " + this.notifiers.size() + " notifier (active=" + this.isActive() + ")";
    }

    protected void finalize() throws Throwable {
        System.out.println("Condition " + this.toString() + " is finalized");
        super.finalize();
    }

    public synchronized boolean isUseless() {
        return this.useless;
    }

    public synchronized void setUseless(boolean mode) {
        this.useless = mode;
    }


}