/*
* Copyright 2014-2016 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.integration.annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.integration.scheduling.PollerMetadata;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.scheduling.support.PeriodicTrigger;
/**
* Provides the {@link PollerMetadata} options for the Messaging annotations for
* polled endpoints.
* It is an analogue of the XML {@code <poller/>} element, but provides only simple attributes.
* If the {@link org.springframework.integration.scheduling.PollerMetadata} requires more options
* (e.g. Transactional and other Advices) or {@code initialDelay, receiveTimeout} etc,
* the {@link org.springframework.integration.scheduling.PollerMetadata} should be configured as
* a generic bean and its bean name can be specified as the {@code value} attribute of this annotation.
* In that case, the other attributes are not allowed.
* <p>
* Non-reference attributes support Property Placeholder resolutions.
*
* @author Artem Bilan
* @author Gary Russell
* @since 4.0
*/
@Target({})
@Retention(RetentionPolicy.RUNTIME)
public @interface Poller {
/**
* @return The {@link PollerMetadata} bean name.
*/
String value() default "";
/**
* @return The {@link Trigger} bean name.
*/
String trigger() default "";
/**
* @return The {@link org.springframework.core.task.TaskExecutor} bean name.
*/
String taskExecutor() default "";
/**
* @return The maximum number of messages to receive for each poll.
* Can be specified as 'property placeholder', e.g. {@code ${poller.maxMessagesPerPoll}}.
* Defaults to -1 (infinity) for polling consumers and 1 for polling inbound channel adapters.
*/
String maxMessagesPerPoll() default "";
/**
* @return The fixed delay in milliseconds to create the {@link PeriodicTrigger}.
* Can be specified as 'property placeholder', e.g. {@code ${poller.fixedDelay}}.
*/
String fixedDelay() default "";
/**
* @return The fixed rate in milliseconds to create the {@link PeriodicTrigger} with {@code fixedRate}.
* Can be specified as 'property placeholder', e.g. {@code ${poller.fixedRate}}.
*/
String fixedRate() default "";
/**
* @return The cron expression to create the {@link CronTrigger}.
* Can be specified as 'property placeholder', e.g. {@code ${poller.cron}}.
*/
String cron() default "";
/**
* @return The the bean name of default error channel
* for the underlying {@code MessagePublishingErrorHandler}.
* @since 4.3.3
*/
String errorChannel() default "";
}