XA Datasource 与 Non-XA Datasource 区别

本文详细解释了XA事务与非XA事务的概念及其区别。XA事务适用于涉及多个资源的全局交易场景,而非XA事务通常用于单一资源的本地交易。文中还介绍了两阶段提交协议以及如何在应用程序中实现这些事务。

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An XA transaction, in the most general terms, is a "global transaction" that may span multiple resources. A non-XA transaction always involves just one resource.


An XA transaction involves a coordinating transaction manager, with one or more databases (or other resources, like JMS) all involved in a single global transaction. Non-XA transactions have no transaction coordinator, and a single resource is doing all its transaction work itself (this is sometimes called local transactions).


XA transactions come from the X/Open group specification on distributed, global transactions. JTA includes the X/Open XA spec, in modified form. 


Most stuff in the world is non-XA - a Servlet or EJB or plain old JDBC in a Java application talking to a single database. XA gets involved when you want to work with multiple resources - 2 or more databases, a database and a JMS connection, all of those plus maybe a JCA resource - all in a single transaction. In this scenario, you'll have an app server like Websphere or Weblogic or JBoss acting as the Transaction Manager, and your various resources (Oracle, Sybase, IBM MQ JMS, SAP, whatever) acting as transaction resources. Your code can then update/delete/publish/whatever across the many resources. When you say "commit", the results are commited across all of the resources. When you say "rollback", _everything_ is rolled back across all resources.


The Transaction Manager coordinates all of this through a protocol called Two Phase Commit (2PC). This protocol also has to be supported by the individual resources.


In terms of datasources, an XA datasource is a data source that can participate in an XA global transaction. A non-XA datasource generally can't participate in a global transaction (sort of - some people implement what's called a "last participant" optimization that can let you do this for exactly one non-XA item).


For more details - see the JTA pages on java.sun.com. Look at the XAResource and Xid interfaces in JTA. See the X/Open XA Distributed Transaction specification. Do a google source on "Java JTA XA transaction".
/* * Copyright 2002-2024 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 * * https://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.scheduling.quartz; import java.io.IOException; import java.util.Map; import java.util.Properties; import java.util.concurrent.Executor; import java.util.concurrent.TimeUnit; import javax.sql.DataSource; import org.quartz.Scheduler; import org.quartz.SchedulerException; import org.quartz.SchedulerFactory; import org.quartz.impl.RemoteScheduler; import org.quartz.impl.SchedulerRepository; import org.quartz.impl.StdSchedulerFactory; import org.quartz.simpl.SimpleThreadPool; import org.quartz.spi.JobFactory; import org.springframework.beans.BeanUtils; import org.springframework.beans.factory.BeanNameAware; import org.springframework.beans.factory.DisposableBean; import org.springframework.beans.factory.FactoryBean; import org.springframework.beans.factory.InitializingBean; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.context.SmartLifecycle; import org.springframework.core.io.Resource; import org.springframework.core.io.ResourceLoader; import org.springframework.core.io.support.PropertiesLoaderUtils; import org.springframework.lang.Nullable; import org.springframework.scheduling.SchedulingException; import org.springframework.util.Assert; import org.springframework.util.CollectionUtils; /** * {@link FactoryBean} that creates and configures a Quartz {@link org.quartz.Scheduler}, * manages its lifecycle as part of the Spring application context, and exposes the * Scheduler as bean reference for dependency injection. * * <p>Allows registration of JobDetails, Calendars and Triggers, automatically * starting the scheduler on initialization and shutting it down on destruction. * In scenarios that just require static registration of jobs at startup, there * is no need to access the Scheduler instance itself in application code. * * <p>For dynamic registration of jobs at runtime, use a bean reference to * this SchedulerFactoryBean to get direct access to the Quartz Scheduler * ({@code org.quartz.Scheduler}). This allows you to create new jobs * and triggers, and also to control and monitor the entire Scheduler. * * <p>Note that Quartz instantiates a new Job for each execution, in * contrast to Timer which uses a TimerTask instance that is shared * between repeated executions. Just JobDetail descriptors are shared. * * <p>When using persistent jobs, it is strongly recommended to perform all * operations on the Scheduler within Spring-managed (or plain JTA) transactions. * Else, database locking will not properly work and might even break. * (See {@link #setDataSource setDataSource} javadoc for details.) * * <p>The preferred way to achieve transactional execution is to demarcate * declarative transactions at the business facade level, which will * automatically apply to Scheduler operations performed within those scopes. * Alternatively, you may add transactional advice for the Scheduler itself. * * <p>Compatible with Quartz 2.1.4 and higher, as of Spring 4.1. * * @author Juergen Hoeller * @since 18.02.2004 * @see #setDataSource * @see org.quartz.Scheduler * @see org.quartz.SchedulerFactory * @see org.quartz.impl.StdSchedulerFactory * @see org.springframework.transaction.interceptor.TransactionProxyFactoryBean */ public class SchedulerFactoryBean extends SchedulerAccessor implements FactoryBean<Scheduler>, BeanNameAware, ApplicationContextAware, InitializingBean, DisposableBean, SmartLifecycle { /** * The thread count property. */ public static final String PROP_THREAD_COUNT = "org.quartz.threadPool.threadCount"; /** * The default thread count. */ public static final int DEFAULT_THREAD_COUNT = 10; private static final ThreadLocal<ResourceLoader> configTimeResourceLoaderHolder = new ThreadLocal<>(); private static final ThreadLocal<Executor> configTimeTaskExecutorHolder = new ThreadLocal<>(); private static final ThreadLocal<DataSource> configTimeDataSourceHolder = new ThreadLocal<>(); private static final ThreadLocal<DataSource> configTimeNonTransactionalDataSourceHolder = new ThreadLocal<>(); /** * Return the {@link ResourceLoader} for the currently configured Quartz Scheduler, * to be used by {@link ResourceLoaderClassLoadHelper}. * <p>This instance will be set before initialization of the corresponding Scheduler, * and reset immediately afterwards. It is thus only available during configuration. * @see #setApplicationContext * @see ResourceLoaderClassLoadHelper */ @Nullable public static ResourceLoader getConfigTimeResourceLoader() { return configTimeResourceLoaderHolder.get(); } /** * Return the {@link Executor} for the currently configured Quartz Scheduler, * to be used by {@link LocalTaskExecutorThreadPool}. * <p>This instance will be set before initialization of the corresponding Scheduler, * and reset immediately afterwards. It is thus only available during configuration. * @since 2.0 * @see #setTaskExecutor * @see LocalTaskExecutorThreadPool */ @Nullable public static Executor getConfigTimeTaskExecutor() { return configTimeTaskExecutorHolder.get(); } /** * Return the {@link DataSource} for the currently configured Quartz Scheduler, * to be used by {@link LocalDataSourceJobStore}. * <p>This instance will be set before initialization of the corresponding Scheduler, * and reset immediately afterwards. It is thus only available during configuration. * @since 1.1 * @see #setDataSource * @see LocalDataSourceJobStore */ @Nullable public static DataSource getConfigTimeDataSource() { return configTimeDataSourceHolder.get(); } /** * Return the non-transactional {@link DataSource} for the currently configured * Quartz Scheduler, to be used by {@link LocalDataSourceJobStore}. * <p>This instance will be set before initialization of the corresponding Scheduler, * and reset immediately afterwards. It is thus only available during configuration. * @since 1.1 * @see #setNonTransactionalDataSource * @see LocalDataSourceJobStore */ @Nullable public static DataSource getConfigTimeNonTransactionalDataSource() { return configTimeNonTransactionalDataSourceHolder.get(); } @Nullable private SchedulerFactory schedulerFactory; private Class<? extends SchedulerFactory> schedulerFactoryClass = StdSchedulerFactory.class; @Nullable private String schedulerName; @Nullable private Resource configLocation; @Nullable private Properties quartzProperties; @Nullable private Executor taskExecutor; @Nullable private DataSource dataSource; @Nullable private DataSource nonTransactionalDataSource; @Nullable private Map<String, ?> schedulerContextMap; @Nullable private String applicationContextSchedulerContextKey; @Nullable private JobFactory jobFactory; private boolean jobFactorySet = false; private boolean autoStartup = true; private int startupDelay = 0; private int phase = DEFAULT_PHASE; private boolean exposeSchedulerInRepository = false; private boolean waitForJobsToCompleteOnShutdown = false; @Nullable private String beanName; @Nullable private ApplicationContext applicationContext; @Nullable private Scheduler scheduler; /** * Set an external Quartz {@link SchedulerFactory} instance to use. * <p>Default is an internal {@link StdSchedulerFactory} instance. If this method is * called, it overrides any class specified through {@link #setSchedulerFactoryClass} * as well as any settings specified through {@link #setConfigLocation}, * {@link #setQuartzProperties}, {@link #setTaskExecutor} or {@link #setDataSource}. * <p><b>NOTE:</b> With an externally provided {@code SchedulerFactory} instance, * local settings such as {@link #setConfigLocation} or {@link #setQuartzProperties} * will be ignored here in {@code SchedulerFactoryBean}, expecting the external * {@code SchedulerFactory} instance to get initialized on its own. * @since 4.3.15 * @see #setSchedulerFactoryClass */ public void setSchedulerFactory(SchedulerFactory schedulerFactory) { this.schedulerFactory = schedulerFactory; } /** * Set the Quartz {@link SchedulerFactory} implementation to use. * <p>Default is the {@link StdSchedulerFactory} class, reading in the standard * {@code quartz.properties} from {@code quartz.jar}. For applying custom Quartz * properties, specify {@link #setConfigLocation "configLocation"} and/or * {@link #setQuartzProperties "quartzProperties"} etc on this local * {@code SchedulerFactoryBean} instance. * @see org.quartz.impl.StdSchedulerFactory * @see #setConfigLocation * @see #setQuartzProperties * @see #setTaskExecutor * @see #setDataSource */ public void setSchedulerFactoryClass(Class<? extends SchedulerFactory> schedulerFactoryClass) { this.schedulerFactoryClass = schedulerFactoryClass; } /** * Set the name of the Scheduler to create via the SchedulerFactory, as an * alternative to the {@code org.quartz.scheduler.instanceName} property. * <p>If not specified, the name will be taken from Quartz properties * ({@code org.quartz.scheduler.instanceName}), or from the declared * {@code SchedulerFactoryBean} bean name as a fallback. * @see #setBeanName * @see StdSchedulerFactory#PROP_SCHED_INSTANCE_NAME * @see org.quartz.SchedulerFactory#getScheduler() * @see org.quartz.SchedulerFactory#getScheduler(String) */ public void setSchedulerName(String schedulerName) { this.schedulerName = schedulerName; } /** * Set the location of the Quartz properties config file, for example * as classpath resource "classpath:quartz.properties". * <p>Note: Can be omitted when all necessary properties are specified * locally via this bean, or when relying on Quartz' default configuration. * @see #setQuartzProperties */ public void setConfigLocation(Resource configLocation) { this.configLocation = configLocation; } /** * Set Quartz properties, like "org.quartz.threadPool.class". * <p>Can be used to override values in a Quartz properties config file, * or to specify all necessary properties locally. * @see #setConfigLocation */ public void setQuartzProperties(Properties quartzProperties) { this.quartzProperties = quartzProperties; } /** * Set a Spring-managed {@link Executor} to use as Quartz backend. * Exposed as thread pool through the Quartz SPI. * <p>Can be used to assign a local JDK ThreadPoolExecutor or a CommonJ * WorkManager as Quartz backend, to avoid Quartz's manual thread creation. * <p>By default, a Quartz SimpleThreadPool will be used, configured through * the corresponding Quartz properties. * @since 2.0 * @see #setQuartzProperties * @see LocalTaskExecutorThreadPool * @see org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor * @see org.springframework.scheduling.concurrent.DefaultManagedTaskExecutor */ public void setTaskExecutor(Executor taskExecutor) { this.taskExecutor = taskExecutor; } /** * Set the default {@link DataSource} to be used by the Scheduler. * <p>Note: If this is set, the Quartz settings should not define * a job store "dataSource" to avoid meaningless double configuration. * Also, do not define a "org.quartz.jobStore.class" property at all. * (You may explicitly define Spring's {@link LocalDataSourceJobStore} * but that's the default when using this method anyway.) * <p>A Spring-specific subclass of Quartz' JobStoreCMT will be used. * It is therefore strongly recommended to perform all operations on * the Scheduler within Spring-managed (or plain JTA) transactions. * Else, database locking will not properly work and might even break * (for example, if trying to obtain a lock on Oracle without a transaction). * <p>Supports both transactional and non-transactional DataSource access. * With a non-XA DataSource and local Spring transactions, a single DataSource * argument is sufficient. In case of an XA DataSource and global JTA transactions, * SchedulerFactoryBean's "nonTransactionalDataSource" property should be set, * passing in a non-XA DataSource that will not participate in global transactions. * @since 1.1 * @see #setNonTransactionalDataSource * @see #setQuartzProperties * @see #setTransactionManager * @see LocalDataSourceJobStore */ public void setDataSource(DataSource dataSource) { this.dataSource = dataSource; } /** * Set the {@link DataSource} to be used <i>for non-transactional access</i>. * <p>This is only necessary if the default DataSource is an XA DataSource that will * always participate in transactions: A non-XA version of that DataSource should * be specified as "nonTransactionalDataSource" in such a scenario. * <p>This is not relevant with a local DataSource instance and Spring transactions. * Specifying a single default DataSource as "dataSource" is sufficient there. * @since 1.1 * @see #setDataSource * @see LocalDataSourceJobStore */ public void setNonTransactionalDataSource(DataSource nonTransactionalDataSource) { this.nonTransactionalDataSource = nonTransactionalDataSource; } /** * Register objects in the Scheduler context via a given Map. * These objects will be available to any Job that runs in this Scheduler. * <p>Note: When using persistent Jobs whose JobDetail will be kept in the * database, do not put Spring-managed beans or an ApplicationContext * reference into the JobDataMap but rather into the SchedulerContext. * @param schedulerContextAsMap a Map with String keys and any objects as * values (for example Spring-managed beans) * @see JobDetailFactoryBean#setJobDataAsMap */ public void setSchedulerContextAsMap(Map<String, ?> schedulerContextAsMap) { this.schedulerContextMap = schedulerContextAsMap; } /** * Set the key of an {@link ApplicationContext} reference to expose in the * SchedulerContext, for example "applicationContext". Default is none. * Only applicable when running in a Spring ApplicationContext. * <p>Note: When using persistent Jobs whose JobDetail will be kept in the * database, do not put an ApplicationContext reference into the JobDataMap * but rather into the SchedulerContext. * <p>In case of a QuartzJobBean, the reference will be applied to the Job * instance as bean property. An "applicationContext" attribute will * correspond to a "setApplicationContext" method in that scenario. * <p>Note that BeanFactory callback interfaces like ApplicationContextAware * are not automatically applied to Quartz Job instances, because Quartz * itself is responsible for the lifecycle of its Jobs. * @see JobDetailFactoryBean#setApplicationContextJobDataKey * @see org.springframework.context.ApplicationContext */ public void setApplicationContextSchedulerContextKey(String applicationContextSchedulerContextKey) { this.applicationContextSchedulerContextKey = applicationContextSchedulerContextKey; } /** * Set the Quartz {@link JobFactory} to use for this Scheduler. * <p>Default is Spring's {@link AdaptableJobFactory}, which supports * {@link java.lang.Runnable} objects as well as standard Quartz * {@link org.quartz.Job} instances. Note that this default only applies * to a <i>local</i> Scheduler, not to a RemoteScheduler (where setting * a custom JobFactory is not supported by Quartz). * <p>Specify an instance of Spring's {@link SpringBeanJobFactory} here * (typically as an inner bean definition) to automatically populate a job's * bean properties from the specified job data map and scheduler context. * @since 2.0 * @see AdaptableJobFactory * @see SpringBeanJobFactory */ public void setJobFactory(JobFactory jobFactory) { this.jobFactory = jobFactory; this.jobFactorySet = true; } /** * Set whether to automatically start the scheduler after initialization. * <p>Default is "true"; set this to "false" to allow for manual startup. */ public void setAutoStartup(boolean autoStartup) { this.autoStartup = autoStartup; } /** * Return whether this scheduler is configured for auto-startup. If "true", * the scheduler will start after the context is refreshed and after the * start delay, if any. */ @Override public boolean isAutoStartup() { return this.autoStartup; } /** * Specify the phase in which this scheduler should be started and stopped. * The startup order proceeds from lowest to highest, and the shutdown order * is the reverse of that. By default this value is {@code Integer.MAX_VALUE} * meaning that this scheduler starts as late as possible and stops as soon * as possible. * @since 3.0 */ public void setPhase(int phase) { this.phase = phase; } /** * Return the phase in which this scheduler will be started and stopped. */ @Override public int getPhase() { return this.phase; } /** * Set the number of seconds to wait after initialization before * starting the scheduler asynchronously. Default is 0, meaning * immediate synchronous startup on initialization of this bean. * <p>Setting this to 10 or 20 seconds makes sense if no jobs * should be run before the entire application has started up. */ public void setStartupDelay(int startupDelay) { this.startupDelay = startupDelay; } /** * Set whether to expose the Spring-managed {@link Scheduler} instance in the * Quartz {@link SchedulerRepository}. Default is "false", since the Spring-managed * Scheduler is usually exclusively intended for access within the Spring context. * <p>Switch this flag to "true" in order to expose the Scheduler globally. * This is not recommended unless you have an existing Spring application that * relies on this behavior. Note that such global exposure was the accidental * default in earlier Spring versions; this has been fixed as of Spring 2.5.6. */ public void setExposeSchedulerInRepository(boolean exposeSchedulerInRepository) { this.exposeSchedulerInRepository = exposeSchedulerInRepository; } /** * Set whether to wait for running jobs to complete on shutdown. * <p>Default is "false". Switch this to "true" if you prefer * fully completed jobs at the expense of a longer shutdown phase. * @see org.quartz.Scheduler#shutdown(boolean) */ public void setWaitForJobsToCompleteOnShutdown(boolean waitForJobsToCompleteOnShutdown) { this.waitForJobsToCompleteOnShutdown = waitForJobsToCompleteOnShutdown; } @Override public void setBeanName(String name) { this.beanName = name; } @Override public void setApplicationContext(ApplicationContext applicationContext) { this.applicationContext = applicationContext; } //--------------------------------------------------------------------- // Implementation of InitializingBean interface //--------------------------------------------------------------------- @Override public void afterPropertiesSet() throws Exception { if (this.dataSource == null && this.nonTransactionalDataSource != null) { this.dataSource = this.nonTransactionalDataSource; } if (this.applicationContext != null && this.resourceLoader == null) { this.resourceLoader = this.applicationContext; } // Initialize the Scheduler instance... this.scheduler = prepareScheduler(prepareSchedulerFactory()); try { registerListeners(); registerJobsAndTriggers(); } catch (Exception ex) { try { this.scheduler.shutdown(true); } catch (Exception ex2) { logger.debug("Scheduler shutdown exception after registration failure", ex2); } throw ex; } } /** * Create a SchedulerFactory if necessary and apply locally defined Quartz properties to it. * @return the initialized SchedulerFactory */ private SchedulerFactory prepareSchedulerFactory() throws SchedulerException, IOException { SchedulerFactory schedulerFactory = this.schedulerFactory; if (schedulerFactory == null) { // Create local SchedulerFactory instance (typically a StdSchedulerFactory) schedulerFactory = BeanUtils.instantiateClass(this.schedulerFactoryClass); if (schedulerFactory instanceof StdSchedulerFactory stdSchedulerFactory) { initSchedulerFactory(stdSchedulerFactory); } else if (this.configLocation != null || this.quartzProperties != null || this.taskExecutor != null || this.dataSource != null) { throw new IllegalArgumentException( "StdSchedulerFactory required for applying Quartz properties: " + schedulerFactory); } // Otherwise, no local settings to be applied via StdSchedulerFactory.initialize(Properties) } // Otherwise, assume that externally provided factory has been initialized with appropriate settings return schedulerFactory; } /** * Initialize the given SchedulerFactory, applying locally defined Quartz properties to it. * @param schedulerFactory the SchedulerFactory to initialize */ private void initSchedulerFactory(StdSchedulerFactory schedulerFactory) throws SchedulerException, IOException { Properties mergedProps = new Properties(); if (this.resourceLoader != null) { mergedProps.setProperty(StdSchedulerFactory.PROP_SCHED_CLASS_LOAD_HELPER_CLASS, ResourceLoaderClassLoadHelper.class.getName()); } if (this.taskExecutor != null) { mergedProps.setProperty(StdSchedulerFactory.PROP_THREAD_POOL_CLASS, LocalTaskExecutorThreadPool.class.getName()); } else { // Set necessary default properties here, as Quartz will not apply // its default configuration when explicitly given properties. mergedProps.setProperty(StdSchedulerFactory.PROP_THREAD_POOL_CLASS, SimpleThreadPool.class.getName()); mergedProps.setProperty(PROP_THREAD_COUNT, Integer.toString(DEFAULT_THREAD_COUNT)); } if (this.configLocation != null) { if (logger.isDebugEnabled()) { logger.debug("Loading Quartz config from [" + this.configLocation + "]"); } PropertiesLoaderUtils.fillProperties(mergedProps, this.configLocation); } CollectionUtils.mergePropertiesIntoMap(this.quartzProperties, mergedProps); if (this.dataSource != null) { mergedProps.putIfAbsent(StdSchedulerFactory.PROP_JOB_STORE_CLASS, LocalDataSourceJobStore.class.getName()); } // Determine scheduler name across local settings and Quartz properties... if (this.schedulerName != null) { mergedProps.setProperty(StdSchedulerFactory.PROP_SCHED_INSTANCE_NAME, this.schedulerName); } else { String nameProp = mergedProps.getProperty(StdSchedulerFactory.PROP_SCHED_INSTANCE_NAME); if (nameProp != null) { this.schedulerName = nameProp; } else if (this.beanName != null) { mergedProps.setProperty(StdSchedulerFactory.PROP_SCHED_INSTANCE_NAME, this.beanName); this.schedulerName = this.beanName; } } schedulerFactory.initialize(mergedProps); } private Scheduler prepareScheduler(SchedulerFactory schedulerFactory) throws SchedulerException { if (this.resourceLoader != null) { // Make given ResourceLoader available for SchedulerFactory configuration. configTimeResourceLoaderHolder.set(this.resourceLoader); } if (this.taskExecutor != null) { // Make given TaskExecutor available for SchedulerFactory configuration. configTimeTaskExecutorHolder.set(this.taskExecutor); } if (this.dataSource != null) { // Make given DataSource available for SchedulerFactory configuration. configTimeDataSourceHolder.set(this.dataSource); } if (this.nonTransactionalDataSource != null) { // Make given non-transactional DataSource available for SchedulerFactory configuration. configTimeNonTransactionalDataSourceHolder.set(this.nonTransactionalDataSource); } // Get Scheduler instance from SchedulerFactory. try { Scheduler scheduler = createScheduler(schedulerFactory, this.schedulerName); populateSchedulerContext(scheduler); if (!this.jobFactorySet && !(scheduler instanceof RemoteScheduler)) { // Use AdaptableJobFactory as default for a local Scheduler, unless when // explicitly given a null value through the "jobFactory" bean property. this.jobFactory = new AdaptableJobFactory(); } if (this.jobFactory != null) { if (this.applicationContext != null && this.jobFactory instanceof ApplicationContextAware applicationContextAware) { applicationContextAware.setApplicationContext(this.applicationContext); } if (this.jobFactory instanceof SchedulerContextAware schedulerContextAware) { schedulerContextAware.setSchedulerContext(scheduler.getContext()); } scheduler.setJobFactory(this.jobFactory); } return scheduler; } finally { if (this.resourceLoader != null) { configTimeResourceLoaderHolder.remove(); } if (this.taskExecutor != null) { configTimeTaskExecutorHolder.remove(); } if (this.dataSource != null) { configTimeDataSourceHolder.remove(); } if (this.nonTransactionalDataSource != null) { configTimeNonTransactionalDataSourceHolder.remove(); } } } /** * Create the Scheduler instance for the given factory and scheduler name. * Called by {@link #afterPropertiesSet}. * <p>The default implementation invokes SchedulerFactory's {@code getScheduler} * method. Can be overridden for custom Scheduler creation. * @param schedulerFactory the factory to create the Scheduler with * @param schedulerName the name of the scheduler to create * @return the Scheduler instance * @throws SchedulerException if thrown by Quartz methods * @see #afterPropertiesSet * @see org.quartz.SchedulerFactory#getScheduler */ @SuppressWarnings("NullAway") protected Scheduler createScheduler(SchedulerFactory schedulerFactory, @Nullable String schedulerName) throws SchedulerException { // Override thread context ClassLoader to work around naive Quartz ClassLoadHelper loading. Thread currentThread = Thread.currentThread(); ClassLoader threadContextClassLoader = currentThread.getContextClassLoader(); boolean overrideClassLoader = (this.resourceLoader != null && this.resourceLoader.getClassLoader() != threadContextClassLoader); if (overrideClassLoader) { currentThread.setContextClassLoader(this.resourceLoader.getClassLoader()); } try { SchedulerRepository repository = SchedulerRepository.getInstance(); synchronized (repository) { Scheduler existingScheduler = (schedulerName != null ? repository.lookup(schedulerName) : null); Scheduler newScheduler = schedulerFactory.getScheduler(); if (newScheduler == existingScheduler) { throw new IllegalStateException("Active Scheduler of name '" + schedulerName + "' already registered " + "in Quartz SchedulerRepository. Cannot create a new Spring-managed Scheduler of the same name!"); } if (!this.exposeSchedulerInRepository) { // Need to remove it in this case, since Quartz shares the Scheduler instance by default! SchedulerRepository.getInstance().remove(newScheduler.getSchedulerName()); } return newScheduler; } } finally { if (overrideClassLoader) { // Reset original thread context ClassLoader. currentThread.setContextClassLoader(threadContextClassLoader); } } } /** * Expose the specified context attributes and/or the current * ApplicationContext in the Quartz SchedulerContext. */ private void populateSchedulerContext(Scheduler scheduler) throws SchedulerException { // Put specified objects into Scheduler context. if (this.schedulerContextMap != null) { scheduler.getContext().putAll(this.schedulerContextMap); } // Register ApplicationContext in Scheduler context. if (this.applicationContextSchedulerContextKey != null) { if (this.applicationContext == null) { throw new IllegalStateException( "SchedulerFactoryBean needs to be set up in an ApplicationContext " + "to be able to handle an 'applicationContextSchedulerContextKey'"); } scheduler.getContext().put(this.applicationContextSchedulerContextKey, this.applicationContext); } } /** * Start the Quartz Scheduler, respecting the "startupDelay" setting. * @param scheduler the Scheduler to start * @param startupDelay the number of seconds to wait before starting * the Scheduler asynchronously */ protected void startScheduler(final Scheduler scheduler, final int startupDelay) throws SchedulerException { if (startupDelay <= 0) { logger.info("Starting Quartz Scheduler now"); scheduler.start(); } else { if (logger.isInfoEnabled()) { logger.info("Will start Quartz Scheduler [" + scheduler.getSchedulerName() + "] in " + startupDelay + " seconds"); } // Not using the Quartz startDelayed method since we explicitly want a daemon // thread here, not keeping the JVM alive in case of all other threads ending. Thread schedulerThread = new Thread(() -> { try { TimeUnit.SECONDS.sleep(startupDelay); } catch (InterruptedException ex) { Thread.currentThread().interrupt(); // simply proceed } if (logger.isInfoEnabled()) { logger.info("Starting Quartz Scheduler now, after delay of " + startupDelay + " seconds"); } try { scheduler.start(); } catch (SchedulerException ex) { throw new SchedulingException("Could not start Quartz Scheduler after delay", ex); } }); schedulerThread.setName("Quartz Scheduler [" + scheduler.getSchedulerName() + "]"); schedulerThread.setDaemon(true); schedulerThread.start(); } } //--------------------------------------------------------------------- // Implementation of FactoryBean interface //--------------------------------------------------------------------- @Override public Scheduler getScheduler() { Assert.state(this.scheduler != null, "No Scheduler set"); return this.scheduler; } @Override @Nullable public Scheduler getObject() { return this.scheduler; } @Override public Class<? extends Scheduler> getObjectType() { return (this.scheduler != null ? this.scheduler.getClass() : Scheduler.class); } @Override public boolean isSingleton() { return true; } //--------------------------------------------------------------------- // Implementation of SmartLifecycle interface //--------------------------------------------------------------------- @Override public void start() throws SchedulingException { if (this.scheduler != null) { try { startScheduler(this.scheduler, this.startupDelay); } catch (SchedulerException ex) { throw new SchedulingException("Could not start Quartz Scheduler", ex); } } } @Override public void stop() throws SchedulingException { if (this.scheduler != null) { try { this.scheduler.standby(); } catch (SchedulerException ex) { throw new SchedulingException("Could not stop Quartz Scheduler", ex); } } } @Override public boolean isRunning() throws SchedulingException { if (this.scheduler != null) { try { return !this.scheduler.isInStandbyMode(); } catch (SchedulerException ex) { return false; } } return false; } //--------------------------------------------------------------------- // Implementation of DisposableBean interface //--------------------------------------------------------------------- /** * Shut down the Quartz scheduler on bean factory shutdown, * stopping all scheduled jobs. */ @Override public void destroy() throws SchedulerException { if (this.scheduler != null) { logger.info("Shutting down Quartz Scheduler"); this.scheduler.shutdown(this.waitForJobsToCompleteOnShutdown); } } } 我看到的start和你的不一样
最新发布
07-26
### 关于 `dynamic-datasource-spring-boot-starter` 和 Spring Boot 的兼容性 为了确保 `dynamic-datasource-spring-boot-starter` 能够正常工作,必须确认其支持的 Spring Boot 版本范围。通常,库的开发者会在项目的 README 文件或官方文档中提供此信息。以下是关于如何判断两者兼容性的分析: #### 1. **动态数据源依赖的核心机制** `dynamic-datasource-spring-boot-starter` 是一个用于实现多数据源切换的工具包。它基于 AOP(面向切面编程)和 Spring 的上下文管理来完成数据源的动态配置切换[^1]。 #### 2. **Spring Boot 的版本约束** 由于 `dynamic-datasource-spring-boot-starter` 需要 Spring JDBC 初始化器以及事务管理模块协同工作,默认情况下会受到 Spring Boot 默认行为的影响。例如,在某些版本中,如果 SQL 初始化脚本失败,则可能导致应用启动中断。因此,建议检查以下属性是否被正确配置: ```properties spring.datasource.continue-on-error=true ``` 这可以防止因数据库初始化错误而导致的应用启动失败。 #### 3. **具体兼容性列表** 根据历史记录和社区反馈,`dynamic-datasource-spring-boot-starter` 支持的主要 Spring Boot 版本如下: - **Spring Boot 2.x 系列**: 包括但不限于 2.1.x、2.2.x、2.3.x。 - **Spring Boot 3.x 系列**: 自 3.0 发布以来,可能需要额外调整以适配新的 Java 版本和框架改动[^2]。 需要注意的是,随着 Spring Boot 不断更新,可能会引入不向后兼容的功能变更。在这种情况下,应查阅对应版本的迁移指南。 #### 4. **MyBatis 配置注意事项** 当使用 MyBatis 进行持久化操作时,还需要验证 `mybatis-spring-boot-starter` 是否也匹配当前使用的 Spring Boot 版本。这是因为 MyBatis 的 Configuration 类定义了映射规则和其他核心逻辑[^4]。例如: ```java @Configuration @MapperScan("com.example.mapper") public class DataSourceConfig { @Bean public DynamicDataSource dataSource() { Map<Object, Object> targetDataSources = new HashMap<>(); // 添加多个数据源... return new DynamicDataSource(primaryDataSource(), targetDataSources); } } ``` 上述代码片段展示了如何通过自定义 Bean 定义动态数据源。 --- ###
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