PoolsSummaryMaintainer.java

package org.dcache.services.info.secondaryInfoProviders;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.dcache.services.info.base.StateExhibitor;
import org.dcache.services.info.base.StatePath;
import org.dcache.services.info.base.StateUpdate;
import org.dcache.services.info.stateInfo.PoolSummaryVisitor;
import org.dcache.services.info.stateInfo.SpaceInfo;

public class PoolsSummaryMaintainer extends AbstractStateWatcher
{
    private static final Logger LOGGER = LoggerFactory.getLogger(PoolsSummaryMaintainer.class);
    private static final String PREDICATE_PATHS[] = { "pools.*.space.*"};
    private static final StatePath SUMMARY_POOLS_SPACE_PATH = StatePath.parsePath("summary.pools.space");

    /**
     * Provide a list of the paths we're interested in.
     */
    @Override
    protected String[] getPredicates()
    {
        return PREDICATE_PATHS;
    }

    /**
     * Something's changed, recalculate the summary information.
     */
    @Override
    public void trigger(StateUpdate update, StateExhibitor currentState,
            StateExhibitor futureState)
    {
        super.trigger(update, currentState, futureState);

        LOGGER.trace("Watcher {} triggered", getClass().getSimpleName());

        //  Visit the new state, extracting summary information
        SpaceInfo info = PoolSummaryVisitor.getDetails(futureState);

        LOGGER.trace("got summary: {}", info);

        // Add our new information as immortal data
        info.addMetrics(update, SUMMARY_POOLS_SPACE_PATH, true);
    }
}