org.springframework.yarn.config.ConfiguringBeanFactoryPostProcessor.java Source code

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Here is the source code for org.springframework.yarn.config.ConfiguringBeanFactoryPostProcessor.java

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/*
 * Copyright 2013 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.springframework.yarn.config;

import java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.parsing.BeanComponentDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionReaderUtils;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.core.task.SyncTaskExecutor;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.yarn.YarnSystemConstants;
import org.springframework.yarn.event.DefaultYarnEventPublisher;
import org.springframework.yarn.support.YarnContextUtils;

/**
 * Bean factory post processor which adds creates default task
 * scheduler and executor if necessary.
 *
 * @author Janne Valkealahti
 *
 */
public class ConfiguringBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    private final static Log log = LogFactory.getLog(ConfiguringBeanFactoryPostProcessor.class);

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        if (beanFactory instanceof BeanDefinitionRegistry) {
            BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
            if (!beanFactory.containsBean(YarnContextUtils.TASK_SCHEDULER_BEAN_NAME)) {
                registerTaskScheduler(registry);
            }
            if (!beanFactory.containsBean(YarnContextUtils.TASK_EXECUTOR_BEAN_NAME)) {
                registerTaskExecutor(registry);
            }
            if (!beanFactory.containsBean(YarnSystemConstants.DEFAULT_ID_EVENT_PUBLISHER)) {
                registerYarnEventPublisher(registry);
            }
        }
    }

    /**
     * Register task scheduler.
     *
     * @param registry the registry
     */
    private void registerTaskScheduler(BeanDefinitionRegistry registry) {
        if (log.isInfoEnabled()) {
            log.info("No bean named '" + YarnContextUtils.TASK_SCHEDULER_BEAN_NAME
                    + "' has been explicitly defined. Therefore, a default ThreadPoolTaskScheduler will be created.");
        }
        BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(ThreadPoolTaskScheduler.class);
        builder.addPropertyValue("poolSize", 10);
        builder.addPropertyValue("threadNamePrefix", "task-scheduler-");
        builder.addPropertyValue("rejectedExecutionHandler", new CallerRunsPolicy());
        BeanComponentDefinition schedulerComponent = new BeanComponentDefinition(builder.getBeanDefinition(),
                YarnContextUtils.TASK_SCHEDULER_BEAN_NAME);
        BeanDefinitionReaderUtils.registerBeanDefinition(schedulerComponent, registry);
    }

    /**
     * Register task executor.
     *
     * @param registry the registry
     */
    private void registerTaskExecutor(BeanDefinitionRegistry registry) {
        if (log.isInfoEnabled()) {
            log.info("No bean named '" + YarnContextUtils.TASK_EXECUTOR_BEAN_NAME
                    + "' has been explicitly defined. Therefore, a default SyncTaskExecutor will be created.");
        }
        BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(SyncTaskExecutor.class);
        BeanComponentDefinition schedulerComponent = new BeanComponentDefinition(builder.getBeanDefinition(),
                YarnContextUtils.TASK_EXECUTOR_BEAN_NAME);
        BeanDefinitionReaderUtils.registerBeanDefinition(schedulerComponent, registry);
    }

    /**
     * Register yarn event publisher
     *
     * @param registry the registry
     */
    private void registerYarnEventPublisher(BeanDefinitionRegistry registry) {
        if (log.isInfoEnabled()) {
            log.info("No bean named '" + YarnSystemConstants.DEFAULT_ID_EVENT_PUBLISHER
                    + "' has been explicitly defined. Therefore, a default YarnEventPublisher will be created.");
        }
        BeanDefinitionBuilder builder = BeanDefinitionBuilder
                .genericBeanDefinition(DefaultYarnEventPublisher.class);
        BeanComponentDefinition eventComponent = new BeanComponentDefinition(builder.getBeanDefinition(),
                YarnSystemConstants.DEFAULT_ID_EVENT_PUBLISHER);
        BeanDefinitionReaderUtils.registerBeanDefinition(eventComponent, registry);
    }

}