com.metamx.druid.merger.coordinator.WorkerWrapper.java Source code

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Here is the source code for com.metamx.druid.merger.coordinator.WorkerWrapper.java

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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package com.metamx.druid.merger.coordinator;

import com.google.common.base.Function;
import com.google.common.base.Throwables;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.metamx.druid.merger.common.TaskStatus;
import com.metamx.druid.merger.worker.Worker;
import com.netflix.curator.framework.recipes.cache.ChildData;
import com.netflix.curator.framework.recipes.cache.PathChildrenCache;
import org.codehaus.jackson.map.ObjectMapper;
import org.joda.time.DateTime;

import javax.annotation.Nullable;
import java.io.Closeable;
import java.io.IOException;
import java.util.Set;

/**
 */
public class WorkerWrapper implements Closeable {
    private final Worker worker;
    private final PathChildrenCache statusCache;
    private final Function<ChildData, String> cacheConverter;

    private volatile DateTime lastCompletedTaskTime = new DateTime();

    public WorkerWrapper(Worker worker, PathChildrenCache statusCache, final ObjectMapper jsonMapper) {
        this.worker = worker;
        this.statusCache = statusCache;
        this.cacheConverter = new Function<ChildData, String>() {
            @Override
            public String apply(@Nullable ChildData input) {
                try {
                    return jsonMapper.readValue(input.getData(), TaskStatus.class).getId();
                } catch (Exception e) {
                    throw Throwables.propagate(e);
                }
            }
        };
    }

    public Worker getWorker() {
        return worker;
    }

    public Set<String> getRunningTasks() {
        return Sets.newHashSet(Lists.transform(statusCache.getCurrentData(), cacheConverter));
    }

    public PathChildrenCache getStatusCache() {
        return statusCache;
    }

    public DateTime getLastCompletedTaskTime() {
        return lastCompletedTaskTime;
    }

    public boolean isAtCapacity() {
        return statusCache.getCurrentData().size() >= worker.getCapacity();
    }

    public void setLastCompletedTaskTime(DateTime completedTaskTime) {
        lastCompletedTaskTime = completedTaskTime;
    }

    @Override
    public void close() throws IOException {
        statusCache.close();
    }
}