Package org.springframework.integration.mongodb.inbound

Class ReactiveMongoDbMessageSource

java.lang.Object

org.springframework.integration.util.AbstractExpressionEvaluator

org.springframework.integration.endpoint.AbstractMessageSource<T>

org.springframework.integration.mongodb.inbound.AbstractMongoDbMessageSource<org.reactivestreams.Publisher<?>>

org.springframework.integration.mongodb.inbound.ReactiveMongoDbMessageSource

All Implemented Interfaces:

Aware, BeanFactoryAware, BeanNameAware, DisposableBean, InitializingBean, ApplicationContextAware, MessageSource<org.reactivestreams.Publisher<?>>, IntegrationPattern, NamedComponent, IntegrationInboundManagement, IntegrationManagement

public class ReactiveMongoDbMessageSource
extends AbstractMongoDbMessageSource<org.reactivestreams.Publisher<?>>

An instance of MessageSource which returns a Message with a payload which is the result of execution of a Query. When expectSingleResult is false (default), the MongoDb Query is executed using ReactiveMongoOperations.find(Query, Class) method which returns a Flux. The returned Flux will be used as the payload of the Message returned by the AbstractMessageSource.receive() method.

When expectSingleResult is true, the ReactiveMongoOperations.findOne(Query, Class) is used instead, and the message payload will be a Mono for the single object returned from the query.

Since:

5.3

Author:

David Turanski, Artem Bilan

Nested Class Summary

Nested classes/interfaces inherited from interface org.springframework.integration.support.management.IntegrationManagement

IntegrationManagement.ManagementOverrides

Field Summary

Fields inherited from class org.springframework.integration.mongodb.inbound.AbstractMongoDbMessageSource

queryExpression

Fields inherited from class org.springframework.integration.util.AbstractExpressionEvaluator

EXPRESSION_PARSER, logger

Fields inherited from interface org.springframework.integration.support.management.IntegrationManagement

METER_PREFIX, RECEIVE_COUNTER_NAME, SEND_TIMER_NAME

Constructor Summary

Constructors

Constructor	Description
ReactiveMongoDbMessageSource(ReactiveMongoOperations reactiveMongoTemplate, Expression queryExpression)	Create an instance with the provided ReactiveMongoOperations and SpEL expression which should resolve to a Mongo 'query' string (see https://www.mongodb.org/display/DOCS/Querying).
ReactiveMongoDbMessageSource(ReactiveMongoDatabaseFactory reactiveMongoDatabaseFactory, Expression queryExpression)	Create an instance with the provided ReactiveMongoDatabaseFactory and SpEL expression which should resolve to a MongoDb 'query' string (see https://www.mongodb.org/display/DOCS/Querying).

Method Summary

Modifier and Type	Method	Description
Object	doReceive()	Execute a Query returning its results as the Message payload.
String	getComponentType()
protected void	onInit()

Methods inherited from class org.springframework.integration.mongodb.inbound.AbstractMongoDbMessageSource

evaluateCollectionNameExpression, evaluateQueryExpression, evaluateUpdateExpression, getApplicationContext, getByIdInQuery, getCollectionNameExpression, getEntityClass, getMongoConverter, getUpdateExpression, idForEntity, isExpectSingleResult, isInitialized, setApplicationContext, setCollectionNameExpression, setEntityClass, setExpectSingleResult, setInitialized, setMongoConverter, setUpdateExpression

Methods inherited from class org.springframework.integration.endpoint.AbstractMessageSource

buildMessage, destroy, getBeanName, getComponentName, getManagedName, getManagedType, getOverrides, isLoggingEnabled, receive, registerMetricsCaptor, setBeanName, setHeaderExpressions, setLoggingEnabled, setManagedName, setManagedType

Methods inherited from class org.springframework.integration.util.AbstractExpressionEvaluator

afterPropertiesSet, evaluateExpression, evaluateExpression, evaluateExpression, evaluateExpression, evaluateExpression, evaluateExpression, evaluateExpression, getBeanFactory, getEvaluationContext, getEvaluationContext, getMessageBuilderFactory, setBeanFactory, setConversionService

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.springframework.integration.support.management.IntegrationManagement

getThisAs, isObserved, registerObservationRegistry

Methods inherited from interface org.springframework.integration.core.MessageSource

getIntegrationPatternType

Constructor Details

ReactiveMongoDbMessageSource

public ReactiveMongoDbMessageSource(ReactiveMongoDatabaseFactory reactiveMongoDatabaseFactory,
 Expression queryExpression)

Create an instance with the provided ReactiveMongoDatabaseFactory and SpEL expression which should resolve to a MongoDb 'query' string (see https://www.mongodb.org/display/DOCS/Querying). The 'queryExpression' will be evaluated on every call to the AbstractMessageSource.receive() method.

Parameters:

reactiveMongoDatabaseFactory - The reactiveMongoDatabaseFactory factory.

queryExpression - The query expression.

ReactiveMongoDbMessageSource

public ReactiveMongoDbMessageSource(ReactiveMongoOperations reactiveMongoTemplate,
 Expression queryExpression)

Create an instance with the provided ReactiveMongoOperations and SpEL expression which should resolve to a Mongo 'query' string (see https://www.mongodb.org/display/DOCS/Querying). It assumes that the ReactiveMongoOperations is fully initialized and ready to be used. The 'queryExpression' will be evaluated on every call to the AbstractMessageSource.receive() method.

Parameters:

reactiveMongoTemplate - The reactive Mongo template.

queryExpression - The query expression.

Method Details

getComponentType

public String getComponentType()

onInit

protected void onInit()

Overrides:

onInit in class AbstractMongoDbMessageSource<org.reactivestreams.Publisher<?>>

doReceive

public Object doReceive()

Execute a Query returning its results as the Message payload. The payload can be either Flux or Mono of objects of type identified by AbstractMongoDbMessageSource.getEntityClass(), or a single element of type identified by AbstractMongoDbMessageSource.getEntityClass() based on the value of AbstractMongoDbMessageSource.isExpectSingleResult() attribute which defaults to 'false' resulting Message with payload of type Flux. The collection name used in the query will be provided in the MongoHeaders.COLLECTION_NAME header.

Specified by:

doReceive in class AbstractMessageSource<org.reactivestreams.Publisher<?>>

Returns:

The value returned.