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Building blocks for ClusterMate-based services and servers.

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package com.fasterxml.clustermate.service.cleanup;

import java.util.concurrent.atomic.AtomicBoolean;

import com.fasterxml.clustermate.service.SharedServiceStuff;
import com.fasterxml.clustermate.service.Stores;
import com.fasterxml.clustermate.service.cluster.ClusterViewByServer;
import com.fasterxml.storemate.shared.TimeMaster;

public abstract class CleanupTask
{
    protected TimeMaster _timeMaster;
    
    protected AtomicBoolean _shutdown;

    protected long _startupTime;

    protected CleanupTask() { }

    protected void init(SharedServiceStuff stuff, Stores stores,
            ClusterViewByServer cluster, AtomicBoolean shutdown)
    {
        _timeMaster = stuff.getTimeMaster();
        _shutdown = shutdown;
    }

    /**
     * Method called by {@link CleanerUpper} when its own prepareForStop()
     * is called; sub-classes may react. Note that when method gets called,
     * {@link #_shutdown} has already been set to true.
     */
    protected void prepareForStop() {
        // Nothing generic to do here
    }
    
    protected boolean shouldStop() {
        return _shutdown.get();
    }

    protected T cleanUp() throws Exception
    {
        _startupTime = _timeMaster.currentTimeMillis();
        return _cleanUp();
    }

    protected abstract T _cleanUp() throws Exception;

    @Override
    public String toString() {
        return getClass().getName();
    }
}