com.metamx.druid.client.OnlyNewSegmentWatcherServerView.java Source code

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Here is the source code for com.metamx.druid.client.OnlyNewSegmentWatcherServerView.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.client;

import com.google.common.collect.Maps;
import com.metamx.common.logger.Logger;
import com.metamx.druid.VersionedIntervalTimeline;
import com.metamx.druid.client.selector.ServerSelector;
import com.metamx.druid.query.QueryRunner;

import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Executor;

/**
 */
public class OnlyNewSegmentWatcherServerView implements MutableServerView {
    private static final Logger log = new Logger(OnlyNewSegmentWatcherServerView.class);

    private final ConcurrentMap<SegmentCallback, Executor> segmentCallbacks;

    public OnlyNewSegmentWatcherServerView() {
        this.segmentCallbacks = Maps.newConcurrentMap();
    }

    @Override
    public void clear() {

    }

    @Override
    public void addServer(DruidServer server) {
    }

    @Override
    public void removeServer(DruidServer server) {
    }

    @Override
    public void serverAddedSegment(DruidServer server, DataSegment segment) {
        runSegmentCallbacks(server, segment);
    }

    @Override
    public void serverRemovedSegment(DruidServer server, String segmentId) {
    }

    @Override
    public VersionedIntervalTimeline<String, ServerSelector> getTimeline(String dataSource) {
        throw new UnsupportedOperationException();
    }

    @Override
    public QueryRunner getQueryRunner(DruidServer server) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void registerServerCallback(Executor exec, ServerCallback callback) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void registerSegmentCallback(Executor exec, SegmentCallback callback) {
        segmentCallbacks.put(callback, exec);
    }

    private void runSegmentCallbacks(final DruidServer server, final DataSegment segment) {
        Iterator<Map.Entry<SegmentCallback, Executor>> iter = segmentCallbacks.entrySet().iterator();

        while (iter.hasNext()) {
            final Map.Entry<SegmentCallback, Executor> entry = iter.next();
            entry.getValue().execute(new Runnable() {
                @Override
                public void run() {
                    if (CallbackAction.UNREGISTER == entry.getKey().segmentAdded(server, segment)) {
                        segmentCallbacks.remove(entry.getKey());
                    }
                }
            });
        }
    }
}