org.nebula.service.archive.EventArchiver.java Source code

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Here is the source code for org.nebula.service.archive.EventArchiver.java

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/*
 * Copyright 2002-2015 the original author or authors.
 *
 * 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.nebula.service.archive;

import org.apache.ibatis.session.RowBounds;
import org.apache.log4j.Logger;
import org.nebula.service.dao.entity.Event;
import org.nebula.service.dao.mapper.EventMapper;
import org.nebula.service.dao.mapper.HistoryEventMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.stereotype.Component;

import java.util.List;

@Component
public class EventArchiver {

    private final static Logger logger = Logger.getLogger(EventArchiver.class);

    private final static int PAGE_SIZE = 20;

    @Autowired
    private HistoryEventMapper historyEventMapper;

    @Autowired
    private EventMapper eventMapper;

    public void archive(String instanceId) {
        backupToHistory(instanceId);
        removeFromCurrent(instanceId);
    }

    private void backupToHistory(String instanceId) {

        int pageNo = 1;
        int pageSize = PAGE_SIZE;
        int total = eventMapper.countByInstanceId(instanceId);

        int processed = 0;
        boolean hasNext = true;
        while (hasNext) {

            RowBounds rowBounds = new RowBounds((pageNo - 1) * pageSize, pageSize);

            List<Event> events = eventMapper.findByInstanceIdByPage(rowBounds, instanceId);
            if (events.size() == 0) {
                break;
            }

            insertIntoHistoryEvents(events);

            processed += events.size();

            hasNext = hasNext(total, processed);

            pageNo++;

        }
    }

    private boolean hasNext(int total, int processed) {
        if (processed < total) {
            return true;
        }
        return false;

    }

    private void insertIntoHistoryEvents(List<Event> events) {
        for (Event event : events) {
            try {
                historyEventMapper.insertEvent(event);
            } catch (DuplicateKeyException e) {
                logger.warn(
                        "Duplicate insert for instanceId=" + event.getInstanceId() + ", eventId=" + event.getId(),
                        e);
            }
        }
    }

    private void removeFromCurrent(String instanceId) {
        eventMapper.deleteInstance(instanceId);
    }
}