edu.scripps.fl.pipeline.StatelessCommitStage.java Source code

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Here is the source code for edu.scripps.fl.pipeline.StatelessCommitStage.java

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/*
 * Copyright 2010 The Scripps Research Institute
 *
 * 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 edu.scripps.fl.pipeline;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.pipeline.StageException;
import org.hibernate.StatelessSession;

/*
 * @author Mark Southern (southern at scripps dot edu)
 */
public abstract class StatelessCommitStage extends StatelessSessionStage {

    private ThreadBasedCounter counter = new ThreadBasedCounter();

    private int commitFrequency = 10;

    public int getCommitFrequency() {
        return commitFrequency;
    }

    public void setCommitFrequency(int commitFrequency) {
        this.commitFrequency = commitFrequency;
    }

    public abstract void doSave(Object obj) throws Exception;

    @Override
    public void process(Object obj) throws StageException {
        try {
            StatelessSession session = getStatelessSession();
            int count = counter.incrementAndGet();
            doSave(obj);
            if (count % getCommitFrequency() == 0) {
                getTransaction().commit();
                setTransaction(session.beginTransaction());
            }
        } catch (Exception ex) {
            throw new StageException(this, ex);
        }
    }

    class ThreadBasedCounter {

        private Map<Thread, Integer> map = new ConcurrentHashMap<Thread, Integer>();

        public int incrementAndGet() {
            Integer ii = map.get(Thread.currentThread());
            if (ii == null) {
                ii = 0;
            }
            ii++;
            map.put(Thread.currentThread(), ii);
            return ii;
        }
    }
}