SimpleJobScheduler.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.nereids.jobs.scheduler;

import org.apache.doris.nereids.CascadesContext;
import org.apache.doris.nereids.exceptions.AnalysisException;
import org.apache.doris.nereids.jobs.Job;
import org.apache.doris.qe.SessionVariable;

import java.util.concurrent.TimeUnit;

/**
 * Single thread, serial scheduler.
 */
public class SimpleJobScheduler implements JobScheduler {
    @Override
    public void executeJobPool(ScheduleContext scheduleContext) {
        JobPool pool = scheduleContext.getJobPool();
        CascadesContext context = (CascadesContext) scheduleContext;
        SessionVariable sessionVariable = context.getConnectContext().getSessionVariable();
        while (!pool.isEmpty()) {
            long elapsedS = context.getStatementContext().getStopwatch().elapsed(TimeUnit.MILLISECONDS) / 1000;
            if (sessionVariable.enableNereidsTimeout
                    && elapsedS > sessionVariable.nereidsTimeoutSecond) {
                throw new AnalysisException(String.format("Nereids cost too much time ( %ds > %ds",
                        elapsedS, sessionVariable.nereidsTimeoutSecond));
            }
            Job job = pool.pop();
            job.execute();
        }
    }
}