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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.Set;

public interface IWatchdog {

    Long getId();

    long getCheckInterval();

    void registerCondition(IWatchedCondition cond);

    int getCountRegisteredConditions();

    Set getAliveConditions();

    void unregisterCondition(IWatchedCondition cond);

    boolean isKilled();

    boolean isStale();

    void activate();

    void deactivate();

    /**
     * if the watchdog watches only conditions that are irrelevant it is marked as useles
     * and it can be shut down.
     *
     * @return
     */
    boolean isUseless();

    boolean isAlive();

    String[] getConditionInfos();

    String getWatchdogInfo();


}