com.ning.metrics.collector.processing.db.FeedEventProcessor.java Source code

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Here is the source code for com.ning.metrics.collector.processing.db.FeedEventProcessor.java

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/*
 * Copyright 2010-2013 Ning, Inc.
 *
 * Ning licenses this file to you 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.
 */
package com.ning.metrics.collector.processing.db;

import com.google.common.base.Strings;
import com.google.common.collect.ArrayListMultimap;
import com.google.inject.Inject;
import com.ning.metrics.collector.binder.config.CollectorConfig;
import com.ning.metrics.collector.processing.db.model.Feed;
import com.ning.metrics.collector.processing.db.model.FeedEvent;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FeedEventProcessor {
    private static final Logger log = LoggerFactory.getLogger(FeedEventProcessor.class);
    private final DatabaseFeedStorage databaseFeedStorage;
    private final DatabaseFeedEventStorage databaseFeedEventStorage;
    private final CollectorConfig config;

    @Inject
    public FeedEventProcessor(final DatabaseFeedStorage databaseFeedStorage,
            final DatabaseFeedEventStorage databaseFeedEventStorage, final CollectorConfig config) {
        this.databaseFeedEventStorage = databaseFeedEventStorage;
        this.databaseFeedStorage = databaseFeedStorage;
        this.config = config;
    }

    public void process(List<FeedEvent> feedEvents) {

        ArrayListMultimap<String, FeedEvent> multimap = sortEventsByFeedKey(feedEvents);
        for (String feedKey : multimap.keySet()) {
            Feed feed = databaseFeedStorage.loadFeedByKey(feedKey);
            if (feed == null) {
                feed = new Feed(multimap.get(feedKey));
            } else {
                feed.addFeedEvents(multimap.get(feedKey), config.getMaxStoredFeedEvents());
            }

            databaseFeedStorage.addOrUpdateFeed(feedKey, feed);
        }
    }

    private ArrayListMultimap<String, FeedEvent> sortEventsByFeedKey(List<FeedEvent> feedEvents) {
        ArrayListMultimap<String, FeedEvent> multimap = ArrayListMultimap.create();
        for (FeedEvent feedEvent : feedEvents) {
            final String feedKey = feedEvent.getMetadata().getFeed();
            if (Strings.isNullOrEmpty(feedKey)) {
                continue;
            }

            multimap.put(feedKey, feedEvent);

        }

        return multimap;
    }
}