DefaultTaskExecutorHandler.java

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// to you 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
//
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package org.apache.doris.job.executor;

import org.apache.doris.job.disruptor.ExecuteTaskEvent;
import org.apache.doris.job.task.AbstractTask;

import com.lmax.disruptor.WorkHandler;
import lombok.extern.log4j.Log4j2;

/**
 * DefaultTaskExecutor is an implementation of the TaskExecutor interface.
 * if you need to implement your own TaskExecutor, you could refer to this class. and need to register
 * it in the TaskExecutorFactory
 * It executes a given AbstractTask by acquiring a semaphore token from the TaskTokenManager
 * and releasing it after the task execution.
 */
@Log4j2
public class DefaultTaskExecutorHandler<T extends AbstractTask> implements WorkHandler<ExecuteTaskEvent<T>> {


    @Override
    public void onEvent(ExecuteTaskEvent<T> executeTaskEvent) {
        try {
            T task = executeTaskEvent.getTask();
            if (null == task) {
                log.warn("task is null, ignore,maybe task has been canceled");
                return;
            }
            if (task.isCancelled()) {
                log.info("task is canceled, ignore. task id is {}", task.getTaskId());
                return;
            }
            log.info("start to execute task, task id is {}", task.getTaskId());
            task.runTask();
        } catch (Exception e) {
            log.error("execute task error, task id is {}", executeTaskEvent.getTask().getTaskId(), e);
        } finally {
            executeTaskEvent.clear();
        }

    }
}