Chapter 106. Scheduler Only consumer is supported The Scheduler component is used to generate message exchanges when a scheduler fires. This component is similar to the Timer component, but it offers more functionality in terms of scheduling. Also this component uses JDK ScheduledExecutorService . Where as the timer uses a JDK Timer . You can only consume events from this endpoint. 106.1. Dependencies When using scheduler with Red Hat build of Camel Spring Boot make sure to use the following Maven dependency to have support for auto configuration: <dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-scheduler-starter</artifactId> </dependency> 106.2. URI format Where name is the name of the scheduler, which is created and shared across endpoints. So if you use the same name for all your scheduler endpoints, only one scheduler thread pool and thread will be used - but you can configure the thread pool to allow more concurrent threads. Note The IN body of the generated exchange is null . So exchange.getIn().getBody() returns null . 106.3. Configuring Options Camel components are configured on two levels: Component level Endpoint level 106.3.1. Component Level Options The component level is the highest level. The configurations you define at this level are inherited by all the endpoints. For example, a component can have security settings, credentials for authentication, urls for network connection, and so on. Since components typically have pre-configured defaults for the most common cases, you may need to only configure a few component options, or maybe none at all. You can configure components with Component DSL in a configuration file (application.properties|yaml), or directly with Java code. 106.3.2. Endpoint Level Options At the Endpoint level you have many options, which you can use to configure what you want the endpoint to do. The options are categorized according to whether the endpoint is used as a consumer (from) or as a producer (to) or used for both. You can configure endpoints directly in the endpoint URI as path and query parameters. You can also use Endpoint DSL and DataFormat DSL as type safe ways of configuring endpoints and data formats in Java. When configuring options, use Property Placeholders for urls, port numbers, sensitive information, and other settings. Placeholders allows you to externalize the configuration from your code, giving you more flexible and reusable code. 106.4. Component Options The Scheduler component supports 3 options, which are listed below. Name Description Default Type bridgeErrorHandler (consumer) Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false boolean autowiredEnabled (advanced) Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. true boolean poolSize (scheduler) Number of core threads in the thread pool used by the scheduling thread pool. Is by default using a single thread. 1 int 106.5. Endpoint Options The Scheduler endpoint is configured using URI syntax: with the following path and query parameters: 106.5.1. Path Parameters (1 parameters) Name Description Default Type name (consumer) Required The name of the scheduler. String 106.5.2. Query Parameters (21 parameters) Name Description Default Type bridgeErrorHandler (consumer) Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false boolean sendEmptyMessageWhenIdle (consumer) If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead. false boolean exceptionHandler (consumer (advanced)) To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored. ExceptionHandler exchangePattern (consumer (advanced)) Sets the exchange pattern when the consumer creates an exchange. Enum values: InOnly InOut InOptionalOut ExchangePattern pollStrategy (consumer (advanced)) A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel. PollingConsumerPollStrategy synchronous (advanced) Sets whether synchronous processing should be strictly used. false boolean backoffErrorThreshold (scheduler) The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in. int backoffIdleThreshold (scheduler) The number of subsequent idle polls that should happen before the backoffMultipler should kick-in. int backoffMultiplier (scheduler) To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured. int delay (scheduler) Milliseconds before the poll. 500 long greedy (scheduler) If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the run polled 1 or more messages. false boolean initialDelay (scheduler) Milliseconds before the first poll starts. 1000 long poolSize (scheduler) Number of core threads in the thread pool used by the scheduling thread pool. Is by default using a single thread. 1 int repeatCount (scheduler) Specifies a maximum limit of number of fires. So if you set it to 1, the scheduler will only fire once. If you set it to 5, it will only fire five times. A value of zero or negative means fire forever. 0 long runLoggingLevel (scheduler) The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that. Enum values: TRACE DEBUG INFO WARN ERROR OFF TRACE LoggingLevel scheduledExecutorService (scheduler) Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool. ScheduledExecutorService scheduler (scheduler) To use a cron scheduler from either camel-spring or camel-quartz component. Use value spring or quartz for built in scheduler. none Object schedulerProperties (scheduler) To configure additional properties when using a custom scheduler or any of the Quartz, Spring based scheduler. Map startScheduler (scheduler) Whether the scheduler should be auto started. true boolean timeUnit (scheduler) Time unit for initialDelay and delay options. Enum values: NANOSECONDS MICROSECONDS MILLISECONDS SECONDS MINUTES HOURS DAYS MILLISECONDS TimeUnit useFixedDelay (scheduler) Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details. true boolean 106.6. More information This component is a scheduler Polling Consumer where you can find more information about the options above, and examples at the Polling Consumer page. 106.7. Exchange Properties When the timer is fired, it adds the following information as properties to the Exchange : Name Type Description Exchange.TIMER_NAME String The value of the name option. Exchange.TIMER_FIRED_TIME Date The time when the consumer fired. 106.8. Sample To set up a route that generates an event every 60 seconds: from("scheduler://foo?delay=60000").to("bean:myBean?method=someMethodName"); The above route will generate an event and then invoke the someMethodName method on the bean called myBean in the Registry such as JNDI or Spring. And the route in Spring DSL: <route> <from uri="scheduler://foo?delay=60000"/> <to uri="bean:myBean?method=someMethodName"/> </route> 106.9. Forcing the scheduler to trigger immediately when completed To let the scheduler trigger as soon as the task is complete, you can set the option greedy=true . But beware then the scheduler will keep firing all the time. So use this with caution. 106.10. Forcing the scheduler to be idle There can be use cases where you want the scheduler to trigger and be greedy. But sometimes you want "tell the scheduler" that there was no task to poll, so the scheduler can change into idle mode using the backoff options. To do this you would need to set a property on the exchange with the key Exchange.SCHEDULER_POLLED_MESSAGES to a boolean value of false. This will cause the consumer to indicate that there was no messages polled. The consumer will otherwise as by default return 1 message polled to the scheduler, every time the consumer has completed processing the exchange. 106.11. Spring Boot Auto-Configuration The component supports 4 options, which are listed below. Name Description Default Type camel.component.scheduler.autowired-enabled Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. true Boolean camel.component.scheduler.bridge-error-handler Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false Boolean camel.component.scheduler.enabled Whether to enable auto configuration of the scheduler component. This is enabled by default. Boolean camel.component.scheduler.pool-size Number of core threads in the thread pool used by the scheduling thread pool. Is by default using a single thread. 1 Integer

Commands:
<dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-scheduler-starter</artifactId> </dependency>
scheduler:name[?options]
scheduler:name
from("scheduler://foo?delay=60000").to("bean:myBean?method=someMethodName");
<route> <from uri="scheduler://foo?delay=60000"/> <to uri="bean:myBean?method=someMethodName"/> </route>