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package org.apache.camel.bam; |
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import org.apache.camel.bam.model.TimerEvent; |
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import org.apache.camel.impl.ServiceSupport; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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import org.springframework.orm.jpa.JpaCallback; |
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import org.springframework.orm.jpa.JpaTemplate; |
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import javax.persistence.EntityManager; |
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import javax.persistence.LockModeType; |
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import javax.persistence.PersistenceException; |
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import java.util.Date; |
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import java.util.List; |
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import java.util.concurrent.ExecutorService; |
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public class TimerEngine extends ServiceSupport implements Runnable { |
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private static final Log log = LogFactory.getLog(TimerEngine.class); |
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private JpaTemplate template; |
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private ExecutorService executor; |
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private long windowMillis = 1000L; |
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private Thread thread; |
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public void run() { |
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while (!isStopped()) { |
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long nextPoll = System.currentTimeMillis() + windowMillis; |
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Date window = new Date(nextPoll); |
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List<TimerEvent> list = template.find("select x from " + TimerEvent.class.getName() + " where x.time < ?1 order by x.time", window); |
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for (TimerEvent event : list) { |
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fireEvent(event); |
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} |
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long timeToSleep = nextPoll - System.currentTimeMillis(); |
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if (timeToSleep > 0) { |
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log.debug("Sleeping for " + timeToSleep + " millis"); |
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try { |
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Thread.sleep(timeToSleep); |
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} |
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catch (InterruptedException e) { |
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log.debug("Caught: " + e, e); |
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} |
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} |
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} |
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} |
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protected void fireEvent(final TimerEvent event) { |
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template.execute(new JpaCallback() { |
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public Object doInJpa(EntityManager entityManager) throws PersistenceException { |
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entityManager.lock(event, LockModeType.WRITE); |
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event.fire(); |
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entityManager.remove(event); |
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return null; |
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} |
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}); |
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} |
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protected void doStart() throws Exception { |
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thread = new Thread(this, "TimerEngine"); |
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thread.start(); |
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} |
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protected void doStop() throws Exception { |
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if (thread != null) { |
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thread = null; |
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} |
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} |
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} |