org.onebusaway.gtfs_realtime.archiver.service.TimeServiceImpl.java Source code

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Here is the source code for org.onebusaway.gtfs_realtime.archiver.service.TimeServiceImpl.java

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/**
 * Copyright (C) 2016 Cambridge Systematics, Inc.
 *
 * Licensed 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 org.onebusaway.gtfs_realtime.archiver.service;

import java.util.Date;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import javax.annotation.PostConstruct;

import org.springframework.stereotype.Component;

import com.google.common.cache.CacheBuilder;

@Component
public class TimeServiceImpl implements TimeService {

    Map<String, Session> sessions;

    @PostConstruct
    public void init() {
        sessions = CacheBuilder.newBuilder().expireAfterAccess(1, TimeUnit.DAYS).<String, Session>build().asMap();
    }

    @Override
    public Date getCurrentTime(String session) {
        Session s = sessions.get(session);
        if (s == null) {
            return null;
        }

        long time = s.originalTime.getTime() + (new Date().getTime() - s.timeSet.getTime());
        return new Date(time);
    }

    @Override
    public void setCurrentTime(String session, Date time) {
        Session s = sessions.get(session);
        if (s != null && time.equals(s.originalTime)) {
            return;
        }

        s = new Session();
        s.originalTime = time;
        s.timeSet = new Date();
        sessions.put(session, s);
    }

    @Override
    public void clear(String session) {
        sessions.remove(session);
    }

    private class Session {
        Date originalTime;
        Date timeSet;
    }
}