For an overview of the changes in Spring Integration 4.2 since version 4.1, please see Chapter 2, What’s new in Spring Integration 4.2?.
Please be sure to also see the Migration Guide for important changes that might affect your applications. Migration guides for all versions back to 2.1 can be found on the Wiki.
A Reactor Promise
return type is now supported for Messaging Gateway methods.
See Section 8.3.9, “Asynchronous Gateway”.
The WebSocket module is now available.
It is fully based on the Spring WebSocket and Spring Messaging modules and provides an <inbound-channel-adapter>
and an <outbound-channel-adapter>
.
See Chapter 33, WebSockets Support for more information.
The Scatter-Gather EIP pattern is now implemented. See Section 6.7, “Scatter-Gather” for more information.
The Routing Slip EIP pattern implementation is now provided. See the section called “Routing Slip” for more information.
The Idempotent Receiver EIP implementation is now provided via the <idempotent-receiver>
component in XML, or the IdempotentReceiverInterceptor
and IdempotentReceiver
annotation when using Java Configuration.
See Section 8.8.7, “Idempotent Receiver Enterprise Integration Pattern” and their JavaDocs for more information.
The Boon`JsonObjectMapper` is now provided for the JSON transformers. See Section 7.1, “Transformer” for more information.
The <redis-queue-inbound-gateway>
and <redis-queue-outbound-gateway>
components are now provided.
See Section 24.10, “Redis Queue Inbound Gateway” and Section 24.9, “Redis Queue Outbound Gateway”.
The PollSkipAdvice
is now provided to be used within <advice-chain>
of the <poller>
to determine if the current poll should be suppressed (skipped) by some condition implemented with PollSkipStrategy
.
See Section 4.2, “Poller” for more information.
Elements that utilize a message listener container (inbound endpoints, channel) now support the missing-queues-fatal
attribute.
See Chapter 11, AMQP Support for more information.
The AMQP outbound endpoints support a new property lazy-connect
(default true).
When true, the connection to the broker is not established until the first message arrives (assuming there are no inbound endpoints, which always attempt to establish the connection during startup).
When set the false an attempt to establish the connection is made during application startup.
See Chapter 11, AMQP Support for more information.
The SimpleMessageStore
no longer makes a copy of the group when calling getMessageGroup()
.
See Caution with SimpleMessageStore for more information.
The <ws:outbound-gateway/>
now provides an encode-uri
attribute to allow disabling the encoding of the URI object before sending the request.
The <http:inbound-channel-adapter>
can now be configured with a status-code-expression
to override the default 200 OK
status.
See Section 17.4, “HTTP Namespace Support” for more information.
The MQTT channel adapters can now be configured to connect to multiple servers, for example, to support High Availability (HA). See Chapter 23, MQTT Support for more information.
The MQTT message-driven channel adapter now supports specifying the QoS setting for each subscription. See Section 23.2, “Inbound (message-driven) Channel Adapter” for more information.
The MQTT outbound channel adapter now supports asynchronous sends, avoiding blocking until delivery is confirmed. See Section 23.3, “Outbound Channel Adapter” for more information.
It is now possible to programmatically subscribe to and unsubscribe from topics at runtime. See Section 23.2, “Inbound (message-driven) Channel Adapter” for more information.
The FTP and SFTP outbound channel adapters now support appending to remote files, as well as taking specific actions when a remote file already exists.
The remote file templates now also support this as well as rmdir()
and exists()
.
In addition, the remote file templates provide access to the underlying client object enabling access to low-level APIs.
See Chapter 15, FTP/FTPS Adapters and Chapter 27, SFTP Adapters for more information.
Splitter
components now support an Iterator
as the result object for producing output messages.
See Section 6.3, “Splitter” for more information.
Aggregator
s now support a new attribute expire-groups-upon-timeout
.
See Section 6.4.4, “Configuring an Aggregator” for more information.
An null-result-expression
attribute has been added, which is evaluated and returned if <enricher>
returns null
.
It can be added in <header>
and <property>
.
See Section 7.2, “Content Enricher” for more information.
An error-channel
attribute has been added, which is used to handle an error flow if Exception
occurs downstream of the request-channel
.
This enable you to return an alternative object to use for enrichment.
See Section 7.2, “Content Enricher” for more information.
The <header-enricher/>
's <header-channels-to-string/>
element can now override the header channel registry’s default time for retaining channel mappings.
See the section called “Header Channel Registry” for more information.
Improvements have been made to the orderly shutdown algorithm. See Section 9.7, “Orderly Shutdown” for more information.
The RecipientListRouter
provides now several management operations to configure recipients at runtime.
With that the <recipient-list-router>
can now be configured without any <recipient>
from the start.
See the section called “RecipientListRouterManagement” for more information.
The AbstractHeaderMapper
implementations now provides the additional NON_STANDARD_HEADERS
token to map any user-defined headers, which aren’t mapped by default.
See Section 11.8, “AMQP Message Headers” for more information.
The new template-channel-transacted
attribute has been introduced for AMQP MessageChannel
s.
See Section 11.7, “AMQP Backed Message Channels” for more information.
The default syslog message converter now has an option to retain the original message in the payload, while still setting the headers. See Section 30.2, “Syslog <inbound-channel-adapter>” for more information.
In addition to the Promise
return type mentioned above, gateway methods may now return a ListenableFuture
, introduced in Spring Framework 4.0.
You can also disable the async processing in the gateway, allowing a downstream flow to directly return a Future
.
See Section 8.3.9, “Asynchronous Gateway”.
Aggregator
s and Resequencer
s now support an <expire-advice-chain/>
and <expire-transactional/>
sub-elements to advise the forceComplete
operation.
See Section 6.4.4, “Configuring an Aggregator” for more information.
The <int:outbound-channel-adapter/>
now supports the <script/>
sub-element.
The underlying script must have a void
return type or return null
.
See Section 8.7, “Groovy support” and Section 8.6, “Scripting support”.
When a message group in a resequencer is timed out (using group-timeout
or a MessageGroupStoreReaper
), late arriving messages will now be discarded immediately by default.
See Section 6.5, “Resequencer”.
Now Spring Integration consistently handles the Java 8’s Optional
type.
See Section 8.4.2, “Configuring Service Activator”.
The QueueChannel
backed Queue type
has been changed from BlockingQueue
to the more generic Queue
.
It allows the use of any external Queue
implementation, for example Reactor’s PersistentQueue
.
See the section called “QueueChannel Configuration”.
The ChannelInterceptor
now supports additional afterSendCompletion()
and afterReceiveCompletion()
methods.
See Section 4.1.3, “Channel Interceptors”.
Since version 4.1.1 there is a change of behavior if you explicitly set the javamail property mail.[protocol].peek
to false
(where [protocol]
is imap
or imaps
).
See Important: IMAP PEEK.
Please be sure to also see the Migration Guide for important changes that might affect your applications. Migration guides for all versions back to 2.1 can be found on the Wiki.
The MQTT channel adapters (previously available in the Spring Integration Extensions repository) are now available as part of the normal Spring Integration distribution. See Chapter 23, MQTT Support
The @EnableIntegration
annotation has been added, to permit declaration of standard Spring Integration beans when using @Configuration
classes.
See Section F.6, “Annotation Support” for more information.
The @IntegrationComponentScan
annotation has been added, to permit classpath scanning for Spring Integration specific components.
See Section F.6, “Annotation Support” for more information.
Message history can now be enabled with the @EnableMessageHistory
annotation in a @Configuration
class; in addition the message history settings can be modified by a JMX MBean.
In addition auto-created MessageHandler
s for annotated endpoints (e.g.
@ServiceActivator
, @Splitter
etc.) now are also trackable by MessageHistory
.
For more information, see Section 9.3, “Message History”.
Messaging gateway interfaces can now be configured with the @MessagingGateway
annotation.
It is an analogue of the <int:gateway/>
xml element.
For more information, see Section 8.3.6, “@MessagingGateway Annotation”.
As well as the @EnableIntegration
annotation mentioned above, a a hook has been introduced to allow the Spring Integration infrastructure beans to be configured using Spring Boot’s @EnableAutoConfiguration
.
For more information seehttp://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-auto-configuration.html[Spring Boot - AutoConfigure].
As well as the @EnableIntegration
annotation mentioned above, the @GlobalChannelInterceptor
annotation has bean introduced.
For more information, see Section F.6, “Annotation Support”.
The @IntegrationConverter
annotation has bean introduced, as an analogue of <int:converter/>
component.
For more information, see Section F.6, “Annotation Support”.
The @EnablePublisher
annotation has been added, to allow the specification of a default-publisher-channel
for @Publisher
annotations.
See Section F.6, “Annotation Support” for more information.
A new Redis MessageGroupStore
, that is optimized for use when backing a QueueChannel
for persistence, is now provided.
For more information, see Section 24.4.1, “Redis Channel Message Stores”.
A new Redis ChannelPriorityMessageStore
is now provided.
This can be used to retrieve messages by priority.
For more information, see Section 24.4.1, “Redis Channel Message Stores”.
MongoDB support now provides the MongoDbChannelMessageStore
- a channel specific MessageStore
implementation.
With priorityEnabled = true
, it can be used in <int:priority-queue>
s to achieve priority order polling of persisted messages.
For more information see Section 22.3.1, “MongoDB Channel Message Store”.
The IntegrationMBeanExporter
can now be enabled with the @EnableIntegrationMBeanExport
annotation in a @Configuration
class.
For more information, see Section 9.2.7, “MBean Exporter”.
Configuration of Spring Security for message channels using @Configuration
classes is now supported by using a ChannelSecurityInterceptorFactoryBean
.
For more information, see Appendix D, Security in Spring Integration.
The Redis support now provides the <outbound-gateway>
component to perform generic Redis commands using the RedisConnection#execute
method.
For more information, see Section 24.8, “Redis Outbound Command Gateway”.
The RedisLockRegistry
and GemfireLockRegistry
are now available supporting global locks visible to multiple application instances/servers.
These can be used with aggregating message handlers across multiple application instances such that group release will occur on only one instance.
For more information, see Section 24.11, “Redis Lock Registry”, Section 16.6, “Gemfire Lock Registry” and Section 6.4, “Aggregator”.
Annotation-based messaging configuration can now have a poller
attribute.
This means that methods annotated with (@ServiceActivator
, @Aggregator
etc.) can now use an inputChannel
that is a reference to a PollableChannel
.
For more information, see Section F.6, “Annotation Support”.
The @InboundChannelAdapter
method annotation is now available.
It is an analogue of the <int:inbound-channel-adapter>
XML component.
In addition, all Messaging Annotations now provide SmartLifecycle
options.
For more information, see Section F.6, “Annotation Support”.
A new twitter endpoint <int-twitter-search-outbound-gateway/>
has been added.
Unlike the search inbound adapter which polls using the same search query each time, the outbound gateway allows on-demand customized queries.
For more information, see Section 32.6, “Twitter Search Outbound Gateway”.
The GemfireMetadataStore
is provided, allowing it to be used, for example, in a AbstractPersistentAcceptOnceFileListFilter
implementation in a multiple application instance/server environment.
For more information, see Section 9.5, “Metadata Store”, Section 14.2, “Reading Files”, Section 15.4, “FTP Inbound Channel Adapter” and Section 27.6, “SFTP Inbound Channel Adapter”.
Annotation and Java configuration has introduced @BridgeFrom
and @BridgeTo
@Bean
method annotations to mark MessageChannel
beans in @Configuration
classes.
For more information, see Section F.6, “Annotation Support”.
Messaging Annotations (@ServiceActivator
, @Router
, @MessagingGateway
etc.) can now be configured as meta-annotations for user-defined Messaging Annotations.
In addition the user-defined annotations can have the same attributes (inputChannel
, @Poller
, autoStartup
etc.).
For more information, see Section F.6, “Annotation Support”.
Core messaging abstractions (Message
, MessageChannel
etc) have moved to the Spring Framework spring-messaging
module.
Users who reference these classes directly in their code will need to make changes as described in the first section of the Migration Guide.
The header-type
attribute has been introduced for the header
sub-element of the <int-xml:xpath-header-enricher>
.
This attribute provides the target type for the header value to which the result of the XPath expression evaluation will be converted.
For more information see Section 35.7, “XPath Header Enricher”.
The result-type
attribute has been introduced for the <int:object-to-json-transformer>
.
This attribute provides the target type for the result of object mapping to JSON.
It supports STRING
(default) and NODE
.
For more information see the section called “Configuring Transformer with XML”.
The DefaultJmsHeaderMapper
now maps an incoming JMSPriority
header to the Spring Integration priority
header.
Previously priority
was only considered for outbound messages.
For more information see Section 20.6, “Mapping Message Headers to/from JMS Message”.
The JMS outbound channel adapter now supports the session-transacted
attribute (default false).
Previously, you had to inject a customized JmsTemplate
to use transactions.
See Section 20.3, “Outbound Channel Adapter”.
The JMS inbound channel adapter now supports the session-transacted
attribute (default false).
Previously, you had to inject a customized JmsTemplate
to use transactions (the adapter allowed transacted in the acknowledgeMode which was incorrect, and didn’t work; this value is no longer allowed).
SeeSection 20.1, “Inbound Channel Adapter”.
You can now specify a MessageConverter
to be used when converting (if necessary) payloads to one of the accepted datatype
s in a Datatype channel.
For more information see the section called “Datatype Channel Configuration”.
Simplified namespace support has been added to configure a RequestHandlerRetryAdvice
.
For more information see the section called “Configuring the Retry Advice”.
The mutually exclusive group-timeout
and group-timeout-expression
attributes have been added to the <int:aggregator>
and <int:resequencer>
.
These attributes allow forced completion of a partial MessageGroup
, if the ReleaseStrategy
does not release a group and no further messages arrive within the time specified.
For more information see Section 6.4.4, “Configuring an Aggregator”.
The RedisMetadataStore
now implements ConcurrentMetadataStore
, allowing it to be used, for example, in a AbstractPersistentAcceptOnceFileListFilter
implementation in a multiple application instance/server environment.
For more information, see Section 24.5, “Redis Metadata Store”, Section 14.2, “Reading Files”, Section 15.4, “FTP Inbound Channel Adapter” and Section 27.6, “SFTP Inbound Channel Adapter”.
The JdbcChannelMessageStore
now implements PriorityCapableChannelMessageStore
, allowing it to be used as a message-store
reference for priority-queue
s.
For more information, see Section 18.4.2, “Backing Message Channels”.
Spring AMQP, by default, creates persistent messages on the broker.
This behavior can be overridden by setting the amqp_deliveryMode
header and/or customizing the mappers.
A convenient default-delivery-mode
attribute has now been added to the adapters to provide easier configuration of this important setting.
For more information, see Section 11.5, “Outbound Channel Adapter” and Section 11.6, “Outbound Gateway”.
The DefaultFtpSessionFactory
now exposes the connectTimeout
, defaultTimeout
and dataTimeout
properties, avoiding the need to subclass the factory just to set these common properties.
The postProcess*
methods are still available for more advanced configuration.
See Section 15.2, “FTP Session Factory” for more information.
The StatusUpdatingMessageHandler
(<int-twitter:outbound-channel-adapter>
) now supports the tweet-data-expression
attribute to build a org.springframework.social.twitter.api.TweetData
object for updating the timeline status allowing, for example, attaching an image.
See Section 32.5.1, “Twitter Outbound Update Channel Adapter” for more information.
The id-expression
attribute has been introduced for <int-jpa:retrieving-outbound-gateway>
to perform EntityManager.find(Class entityClass, Object primaryKey)
.
See Section 19.6.3, “Retrieving Outbound Gateway” for more information.
When one of the standard deserializers encounters a problem decoding the input stream to a message, it will now emit a TcpDeserializationExceptionEvent
, allowing applications to examine the data at the point the exception occurred.
See Section 31.5, “TCP Connection Events” for more information.
Messaging Annotations (@ServiceActivator
, @Router
, @InboundChannelAdapter
etc.) can now be configured on @Bean
definitions in @Configuration
classes.
For more information, see Section F.6, “Annotation Support”.
The HTTP module now provides powerful Request Mapping support for Inbound Endpoints.
Class UriPathHandlerMapping
was replaced by IntegrationRequestMappingHandlerMapping
, which is registered under the bean name integrationRequestMappingHandlerMapping
in the application context.
Upon parsing of the HTTP Inbound Endpoint, a new IntegrationRequestMappingHandlerMapping
bean is either registered or an existing bean is being reused.
To achieve flexible Request Mapping configuration, Spring Integration provides the <request-mapping/>
sub-element for the <http:inbound-channel-adapter/>
and the <http:inbound-gateway/>
.
Both HTTP Inbound Endpoints are now fully based on the Request Mapping infrastructure that was introduced with Spring MVC 3.1.
For example, multiple paths are supported on a single inbound endpoint.
For more information see Section 17.4, “HTTP Namespace Support”.
A new IntegrationEvaluationContextFactoryBean
is provided to allow configuration of custom PropertyAccessor
s and functions for use in SpEL expressions throughout the framework.
For more information see Appendix A, Spring Expression Language (SpEL).
To customize the SpEL EvaluationContext
with static Method
functions, the new <spel-function/>
component is introduced.
Two built-in functions are also provided (#jsonPath
and #xpath
).
For more information see Section A.3, “SpEL Functions”.
To customize the SpEL EvaluationContext
with PropertyAccessor
implementations the new <spel-property-accessors/>
component is introduced.
For more information see Section A.4, “PropertyAccessors”.
A new Redis-based MetadataStore implementation has been added.
The RedisMetadataStore
can be used to maintain state of a MetadataStore
across application restarts.
This new MetadataStore
implementation can be used with adapters such as:
New queue-based components have been added.
The <int-redis:queue-inbound-channel-adapter/>
and the <int-redis:queue-outbound-channel-adapter/>
components are provided to perform right pop and left push operations on a Redis List, respectively.
For more information see Chapter 24, Redis Support.
It is now possible to instruct the framework to store reply and error channels in a registry for later resolution.
This is useful for cases where the replyChannel
or errorChannel
might be lost; for example when serializing a message.
See Section 7.2.2, “Header Enricher” for more information.
In addition to the existing eMongoDbMessageStore
, a new ConfigurableMongoDbMessageStore
has been introduced.
This provides a more robust and flexible implementation of MessageStore
for MongoDB.
It does not have backward compatibility, with the existing store, but it is recommended to use it for new applications.
Existing applications can use it, but messages in the old store will not be available.
See Chapter 22, MongoDb Support for more information.
Building on the 2.2 SyslogToMapTransformer
Spring Integration 3.0 now introduces UDP
and TCP
inbound channel adapters especially tailored for receiving SYSLOG messages.
For more information, seeChapter 30, Syslog Support.
File 'tail’ing inbound channel adapters are now provided to generate messages when lines are added to the end of text files; see Section 14.2.6, “'Tail’ing Files”.
<int-jmx:tree-polling-channel-adapter/>
is provided; this adapter queries the JMX MBean tree and sends a message with a payload that is the graph of objects that matches the query.
By default the MBeans are mapped to primitives and simple Objects like Map, List and arrays - permitting simple transformation, for example, to JSON.
IntegrationMBeanExporter
now allows the configuration of a custom ObjectNamingStrategy
using the naming-strategy
attribute.
For more information, see Section 9.2, “JMX Support”.
TcpConnection
s now emit ApplicationEvent
s (specifically TcpConnectionEvent
s) when connections are opened, closed, or an exception occurs.
This allows applications to be informed of changes to TCP connections using the normal Spring ApplicationListener
mechanism.
AbstractTcpConnection
has been renamed TcpConnectionSupport
; custom connections that are subclasses of this class, can use its methods to publish events.
Similarly, AbstractTcpConnectionInterceptor
has been renamed to TcpConnectionInterceptorSupport
.
In addition, a new <int-ip:tcp-connection-event-inbound-channel-adapter/>
is provided; by default, this adapter sends all TcpConnectionEvent
s to a Channel
.
Further, the TCP Connection Factories, now provide a new method getOpenConnectionIds()
, which returns a list of identifiers for all open connections; this allows applications, for example, to broadcast to all open connections.
Finally, the connection factories also provide a new method closeConnection(String connectionId)
which allows applications to explicitly close a connection using its ID.
For more information see Section 31.5, “TCP Connection Events”.
The <int:inbound-channel-adapter/>
now supports <expression/>
and <script/>
sub-elements to create a MessageSource
; see Section 4.3.3, “Channel Adapter Expressions and Scripts”.
The Content Enricher now provides configuration for <header/>
sub-elements, to enrich the outbound Message with headers based on the reply Message from the underlying message flow.
For more information see Section 7.2.3, “Payload Enricher”.
Previously, message ids were generated using the JDK UUID.randomUUID()
method.
With this release, the default mechanism has been changed to use a more efficient algorithm which is significantly faster.
In addition, the ability to change the strategy used to generate message ids has been added.
For more information see the section called “Message ID Generation”.
GatewayMethodMetadata
is now public class and it makes possible flexibly to configure the GatewayProxyFactoryBean
programmatically from Java code.
For more information see Section 8.3, “Messaging Gateways”.
<http:outbound-gateway/>
and <http:outbound-channel-adapter/>
now provide an encode-uri
attribute to allow disabling the encoding of the URI object before sending the request.
<http:inbound-gateway/>
and <http:inbound-channel-adapter/>
now have a merge-with-default-converters
attribute to include the list of default HttpMessageConverter
s after the custom message converters.
DefaultHttpHeaderMapper
.
Now, in addition correcting that issue, DefaultHttpHeaderMapper
provides date parsing from formatted strings for any HTTP headers that accept date-time values.
<http:inbound-gateway/>
and <http:inbound-channel-adapter/>
now support additional useful variables: #matrixVariables, #requestAttributes, #requestHeaders and #cookies.
These variables are available in both payload and header expressions.
uri-variables-expression
attribute to specify an Expression
to evaluate a Map
for all URI variable placeholders within URL template.
This allows selection of a different map of expressions based on the outgoing message.
For more information see Chapter 17, HTTP Support.
ObjectToJsonTransformer
and JsonToObjectTransformer
now emit/consume headers containing type information.
For more information, see JSON Transformers in Section 7.1, “Transformer”.
Previously, the id attribute for elements within a <chain>
was ignored and, in some cases, disallowed.
Now, the id attribute is allowed for all elements within a <chain>
.
The bean names of chain elements is a combination of the surrounding chain’s id and the id of the element itself.
For example: fooChain$child.fooTransformer.handler.
For more information see Section 6.6, “Message Handler Chain”.
The AbstractCorrelatingMessageHandler
provides a new property empty-group-min-timeout
to allow empty group expiry to run on a longer schedule than expiring partial groups.
Empty groups will not be removed from the MessageStore
until they have not been modified for at least this number of milliseconds.
For more information see Section 6.4.4, “Configuring an Aggregator”.
New FileListFilter
s that use a persistent MetadataStore
are now available.
These can be used to prevent duplicate files after a system restart.
SeeSection 14.2, “Reading Files”, Section 15.4, “FTP Inbound Channel Adapter”, and Section 27.6, “SFTP Inbound Channel Adapter” for more information.
A new variables
attribute has been introduced for scripting components.
In addition, variable bindings are now allowed for inline scripts.
See Section 8.7, “Groovy support” and Section 8.6, “Scripting support” for more information.
Previously, when configuring LoadBalancingStrategy
on the channel’s dispatcher sub-element, the only available option was to use a pre-defined enumeration of values which did not allow one to set a custom implementation of the LoadBalancingStrategy
.
You can now use load-balancer-ref
to provide a reference to a custom implementation of the LoadBalancingStrategy
.
For more information see the section called “DirectChannel”.
Previously, sending to a <publish-subscribe-channel/> that had no subscribers would return a false
result.
If used in conjunction with a MessagingTemplate
, this would result in an exception being thrown.
Now, the PublishSubscribeChannel
has a property minSubscribers
(default 0).
If the message is sent to at least the minimum number of subscribers, the send is deemed to be successful (even if zero).
If an application is expecting to get an exception under these conditions, set the minimum subscribers to at least 1.
The FTP, SFTP and FTPS endpoints no longer cache sessions by default
The deprecated cached-sessions
attribute has been removed from all endpoints.
Previously, the embedded caching mechanism controlled by this attribute’s value didn’t provide a way to limit the size of the cache, which could grow indefinitely.
The CachingConnectionFactory
was introduced in release 2.1 and it became the preferred (and is now the only) way to cache sessions.
The CachingConnectionFactory
now provides a new method resetCache()
.
This immediately closes idle sessions and causes in-use sessions to be closed as and when they are returned to the cache.
The DefaultSftpSessionFactory
(in conjunction with a CachingSessionFactory
) now supports multiplexing channels over a single SSH connection (SFTP Only).
FTP, SFTP and FTPS Inbound Adapters
Previously, there was no way to override the default filter used to process files retrieved from a remote server.
The filter
attribute determines which files are retrieved but the FileReadingMessageSource
uses an AcceptOnceFileListFilter
.
This means that if a new copy of a file is retrieved, with the same name as a previously copied file, no message was sent from the adapter.
With this release, a new attribute local-filter
allows you to override the default filter, for example with an AcceptAllFileListFilter
, or some other custom filter.
For users that wish the behavior of the AcceptOnceFileListFilter
to be maintained across JVM executions, a custom filter that retains state, perhaps on the file system, can now be configured.
Inbound Channel Adapters now support the preserve-timestamp
attribute, which sets the local file modified timestamp to the timestamp from the server (default false).
FTP, SFTP and FTPS Gateways
local-filename-generator-expression
attribute is now supported, enabling the naming of local files during retrieval.
By default, the same name as the remote file is used.
local-directory-expression
attribute is now supported, enabling the naming of local directories during retrieval based on the remote directory.
Remote File Template
A new higher-level abstraction (RemoteFileTemplate
) is provided over the Session
implementations used by the FTP and SFTP modules.
While it is used internally by endpoints, this abstraction can also be used programmatically and, like all Spring *Template
implementations, reliably closes the underlying session while allowing low level access to the session when needed.
For more information, see Chapter 15, FTP/FTPS Adapters and Chapter 27, SFTP Adapters.
All Outbound Gateways (e.g.
<jdbc:outbound-gateway/>
or <jms:outbound-gateway/>
) are designed for request-reply scenarios.
A response is expected from the external service and will be published to the reply-channel
, or the replyChannel
message header.
However, there are some cases where the external system might not always return a result, e.g.
a <jdbc:outbound-gateway/>
, when a SELECT ends with an empty ResultSet
or, say, a Web Service is One-Way.
An option is therefore needed to configure whether or not a reply is required.
For this purpose, the requires-reply attribute has been introduced for Outbound Gateway components.
In most cases, the default value for requires-reply is true
and, if there is not any result, a ReplyRequiredException
will be thrown.
Changing the value to false
means that, if an external service doesn’t return anything, the message-flow will end at that point, similar to an Outbound Channel Adapter.
Note | |
---|---|
The WebService outbound gateway has an additional attribute |
Note, the requiresReply
property was previously present in the AbstractReplyProducingMessageHandler
but set to false
, and there wasn’t any way to configure it on Outbound Gateways using the XML namespace.
Important | |
---|---|
Previously, a gateway receiving no reply would silently end the flow (with a DEBUG log message); with this change an exception will now be thrown by default by most gateways.
To revert to the previous behavior, set |
Previously, the <int-amqp:outbound-gateway/> mapped headers before invoking the message converter, and the converter could overwrite headers such as content-type
.
The outbound adapter maps the headers after the conversion, which means headers like content-type
from the outbound Message
(if present) are used.
Starting with this release, the gateway now maps the headers after the message conversion, consistent with the adapter.
If your application relies on the previous behavior (where the converter’s headers overrode the mapped headers), you either need to filter those headers (before the message reaches the gateway) or set them appropriately.
The headers affected by the SimpleMessageConverter
are content-type
and content-encoding
.
Custom message converters may set other headers.
For more complex database-specific types, not supported by the standard CallableStatement.getObject
method, 2 new additional attributes were introduced to the <sql-parameter-definition/>
element with OUT-direction:
type-name
return-type
The row-mapper
attribute of the Stored Procedure Inbound Channel Adapter <returning-resultset/>
sub-element now supports a reference to a RowMapper
bean definition.
Previously, it contained just a class name (which is still supported).
For more information see Section 18.5, “Stored Procedures”.
Web Service Outbound Gateway uri attribute now supports <uri-variable/>
substitution for all URI-schemes supported by Spring Web Services.
For more information see Section 34.4, “Outbound URI Configuration”.
The Redis Inbound Channel Adapter can now use a null
value for serializer
property, with the raw data being the message payload.
The Redis Outbound Channel Adapter now has the topic-expression
property to determine the Redis topic against the Message at runtime.
The Redis Inbound Channel Adapter, in addition to the existing topics
attribute, now has the topic-patterns
attribute.
For more information, see Chapter 24, Redis Support.
Previously, when a <filter/> had a <request-handler-advice-chain/>, the discard action was all performed within the scope of the advice chain (including any downstream flow on the discard-channel
).
The filter element now has an attribute discard-within-advice
(default true
), to allow the discard action to be performed after the advice chain completes.
See Section 8.8.4, “Advising Filters”.
Request Handler Advice Chains can now be configured using annotations. See Section 8.8.5, “Advising Endpoints Using Annotations”.
This transformer now correctly transforms byte[]
and char[]
payloads to String
.
For more information see Section 7.1, “Transformer”.
Payloads to persist or merge can now be of type http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html[java.lang.Iterable]
.
In that case, each object returned by the Iterable
is treated as an entity and persisted or merged using the underlying EntityManager
.
NULL values returned by the iterator are ignored.
The JPA adapters now have additional attributes to optionally flush and clear entities from the associated persistence context after performing persistence operations.
Retrieving gateways had no mechanism to specify the first record to be retrieved which is a common use case.
The retrieving gateways now support specifying this parameter using a first-result
and first-result-expression
attributes to the gateway definition.
Section 19.6.3, “Retrieving Outbound Gateway”.
The JPA retrieving gateway and inbound adapter now have an attribute to specify the maximum number of results in a result set as an expression.
In addition, the max-results
attribute has been introduced to replace max-number-of-results
, which has been deprecated.
max-results
and max-results-expression
are used to provide the maximum number of results, or an expression to compute the maximum number of results, respectively, in the result set.
For more information see Chapter 19, JPA Support.
Previously, the <delayer>
provided a delay-header-name
attribute to determine the delay value at runtime.
In complex cases it was necessary to precede the <delayer>
with a <header-enricher>
.
Spring Integration 3.0 introduced the expression
attribute and expression
sub-element for dynamic delay determination.
The delay-header-name
attribute is now deprecated because the header evaluation can be specified in the expression
.
In addition, the ignore-expression-failures
was introduced to control the behavior when an expression evaluation fails.
For more information see Section 8.5, “Delayer”.
Spring Integration 3.0 adds a new set of DDL scripts for MySQL version 5.6.4 and higher. Now MySQL supports fractional seconds and is thus improving the FIFO ordering when polling from a MySQL-based Message Store. For more information, please see Section 18.4.1, “The Generic JDBC Message Store”.
Previously, if an IMAP idle connection failed, it was logged but there was no mechanism to inform an application.
Such exceptions now generate ApplicationEvent
s.
Applications can obtain these events using an <int-event:inbound-channel-adapter>
or any ApplicationListener
configured to receive an ImapIdleExceptionEvent
or one of its super classes.
The TCP connection factories now enable the configuration of a flexible mechanism to transfer selected headers (as well as the payload) over TCP.
A new TcpMessageMapper
enables the selection of the headers, and an appropriate (de)serializer needs to be configured to write the resulting Map
to the TCP stream.
A MapJsonSerializer
is provided as a convenient mechanism to transfer headers and payload over TCP.
For more information see Section 31.8.4, “Transferring Headers”.
Previously, when configuring a <message-driven-channel-adapter/>
, if you wished to use a specific TaskExecutor
, it was necessary to declare a container bean and provide it to the adapter using the container
attribute.
The task-executor
is now provided, allowing it to be set directly on the adapter.
This is in addition to several other container attributes that were already available.
The RMI Inbound Gateway now supports an error-channel
attribute.
See Section 26.3, “Inbound RMI”.
You can now specify the transformer factory class name using the transformer-factory-class
attribute.
See the section called “XsltPayloadTransformer”
Spring Integration now has RedisStore Inbound and Outbound Channel Adapters allowing you to write and read Message payloads to/from Redis collection(s). For more information please see Section 24.7, “RedisStore Outbound Channel Adapter” and Section 24.6, “RedisStore Inbound Channel Adapter”.
Spring Integration now has MongoDB Inbound and Outbound Channel Adapters allowing you to write and read Message payloads to/from a MongoDB document store. For more information please see Section 22.5, “MongoDB Outbound Channel Adapter” and Section 22.4, “MongoDB Inbound Channel Adapter”.
Spring Integration now includes components for the Java Persistence API (JPA) for retrieving and persisting JPA entity objects. The JPA Adapter includes the following components:
For more information please see Chapter 19, JPA Support
The ability to add an <advice-chain/> to a poller has been available for some time. However, the behavior added by this affects the entire integration flow. It did not address the ability to add, say, retry, to an individual endpoint. The 2.2. release introduces the <request-handler-advice-chain/> to many endpoints.
In addition, 3 standard Advice classes have been provided for this purpose:
For more information, see Section 8.8, “Adding Behavior to Endpoints”.
Pollers can now participate in Spring’s Transaction Synchronization feature. This allows for synchronizing such operations as renaming files by an inbound channel adapter depending on whether the transaction commits, or rolls back.
In addition, these features can be enabled when there is not a real transaction present, by means of a PseudoTransactionManager
.
For more information see Section C.3, “Transaction Synchronization”.
When using the File Oubound Channel Adapter or the File Outbound Gateway, a new mode property was added. Prior to Spring Integration 2.2, target files were replaced when they existed. Now you can specify the following options:
For more information please see Section 14.3.3, “Dealing with Existing Destination Files”.
The XML Namespace support adds the reply-timeout attribute to the following Outbound Gateways:
Spring Integration now uses Spring AMQP 1.1. This enables several features to be used within a Spring Integration application, including…
SpEL Support
When using the Stored Procedure components of the Spring Integration JDBC Adapter, you can now provide Stored Procedure Names or Stored Function Names using Spring Expression Language (SpEL).
This allows you to specify the Stored Procedures to be invoked at runtime. For example, you can provide Stored Procedure names that you would like to execute via Message Headers. For more information please see Section 18.5, “Stored Procedures”.
JMX Support
The Stored Procedure components now provide basic JMX support, exposing some of their properties as MBeans:
When using the JDBC Outbound Gateway, the update query is no longer mandatory. You can now provide solely a select query using the request message as a source of parameters.
A new Message Channel-specific Message Store Implementation has been added, providing a more scalable solution using database-specific SQL queries. For more information please see: Section 18.4.2, “Backing Message Channels”.
A method stopActiveComponents()
has been added to the IntegrationMBeanExporter.
This allows a Spring Integration application to be shut down in an orderly manner, disallowing new inbound messages to certain adapters and waiting for some time to allow in-flight messages to complete.
The JMS Outbound Gateway can now be configured to use a`MessageListener` container to receive replies. This can improve performance of the gateway.
The ObjectToJsonTransformer
now sets the content-type header to application/json by default.
For more information see Section 7.1, “Transformer”.
Java serialization over HTTP is no longer enabled by default.
Previously, when setting a expected-response-type
to a Serializable
object, the Accept
header was not properly set up.
The SerializingHttpMessageConverter
has now been updated to set the Accept header to application/x-java-serialized-object
.
However, because this could cause incompatibility with existing applications, it was decided to no longer automatically add this converter to the HTTP endpoints.
If you wish to use Java serialization, you will need to add the SerializingHttpMessageConverter
to the appropriate endpoints, using the message-converters
attribute, when using XML configuration, or using the setMessageConverters()
method.
Alternatively, you may wish to consider using JSON instead which is enabled by simply having Jackson
on the classpath.
In Spring Integration 2.0, support for Groovy was added. With Spring Integration 2.1 we expanded support for additional languages substantially by implementing support for JSR-223 (Scripting for the Java™ Platform). Now you have the ability to use any scripting language that supports JSR-223 including:
For further details please see Section 8.6, “Scripting support”.
Spring Integration provides support for GemFire by providing inbound adapters for entry and continuous query events, an outbound adapter to write entries to the cache, and MessageStore
and MessageGroupStore
implementations.
Spring integration leverages the Spring Gemfire project, providing a thin wrapper over its components.
For further details please see Chapter 16, GemFire Support.
Spring Integration 2.1 adds several Channel Adapters for receiving and sending messages using thehttp://www.amqp.org/[Advanced Message Queuing Protocol] (AMQP). Furthermore, Spring Integration also provides a point-to-point Message Channel, as well as a publish/subscribe Message Channel that are backed by AMQP Exchanges and Queues.
For further details please see Chapter 11, AMQP Support.
As of version 2.1 Spring Integration provides support for MongoDB by providing a MongoDB-based MessageStore.
For further details please see Chapter 22, MongoDb Support.
As of version 2.1 Spring Integration supports Redis, an advanced key-value store, by providing a Redis-based MessageStore as well as Publish-Subscribe Messaging adapters.
For further details please see Chapter 24, Redis Support.
As of version 2.1, we’ve introduced a new Resource Inbound Channel Adapter that builds upon Spring’s Resource abstraction to support greater flexibility across a variety of actual types of underlying resources, such as a file, a URL, or a class path resource. Therefore, it’s similar to but more generic than the File Inbound Channel Adapter.
For further details please see Section 25.2, “Resource Inbound Channel Adapter”.
With Spring Integration 2.1, the JDBC
Module also provides Stored Procedure support by adding several new components, including inbound/outbound channel adapters and an Outbound Gateway.
The Stored Procedure support leverages Spring’shttp://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/jdbc/core/simple/SimpleJdbcCall.html[SimpleJdbcCall
] class and consequently supports stored procedures for:
The Stored Procedure components also support Sql Functions for the following databases:
For further details please see Section 18.5, “Stored Procedures”.
Spring Integration 2.1 provides a new XPath-based Message Filter, that is part of the XML
module.
The XPath Filter allows you to filter messages using provided XPath Expressions.
Furthermore, documentation was added for the XML Validating Filter.
For more details please see Section 35.8, “Using the XPath Filter” and Section 35.10, “XML Validating Filter”.
Since Spring Integration 2.1, the Payload Enricher is provided.
A Payload Enricher defines an endpoint that typically passes ahttp://static.springsource.org/spring-integration/api/org/springframework/integration/Message.html[Message
] to the exposed request channel and then expects a reply message.
The reply message then becomes the root object for evaluation of expressions to enrich the target payload.
For further details please see Section 7.2.3, “Payload Enricher”.
Spring Integration 2.1 provides two new Outbound Gateways in order to interact with remote File Transfer Protocol (FTP) or Secure File Transfer Protocol (SFT) servers. These two gateways allow you to directly execute a limited set of remote commands.
For instance, you can use these Outbound Gateways to list, retrieve and delete remote files and have the Spring Integration message flow continue with the remote server’s response.
For further details please see Section 15.6, “FTP Outbound Gateway” and Section 27.8, “SFTP Outbound Gateway”.
As of version 2.1, we have exposed more flexibility with regards to session management for remote file adapters (e.g., FTP, SFTP etc).
Specifically, the cache-sessions
attribute, which is available via the XML namespace support, is now deprecated.
Alternatively, we added the sessionCacheSize
and sessionWaitTimeout
attributes on the CachingSessionFactory
.
For further details please see Section 15.7, “FTP Session Caching” and Section 27.4, “SFTP Session Caching”.
Router parameters have been standardized across all router implementations with Spring Integration 2.1 providing a more consistent user experience.
With Spring Integration 2.1 the ignore-channel-name-resolution-failures
attribute has been removed in favor of consolidating its behavior with the resolution-required
attribute.
Also, the resolution-required
attribute now defaults to true
.
Starting with Spring Integration 2.1, routers will no longer silently drop any messages, if no default output channel was defined.
This means, that by default routers now require at least one resolved channel (if no default-output-channel
was set) and by default will throw a MessageDeliveryException
if no channel was determined (or an attempt to send was not successful).
If, however, you do desire to drop messages silently, simply set default-output-channel="nullChannel"
.
Important | |
---|---|
With the standardization of Router parameters and the consolidation of the parameters described above, there is the possibility of breaking older Spring Integration based applications. |
For further details please see Section 6.1, “Routers”
Spring Integration 2.1 ships with an updated XML Schema (version 2.1), providing many improvements, e.g. the Router standardizations discussed above.
From now on, users must always declare the latest XML schema (currently version 2.1). Alternatively, they can use the version-less schema. Generally, the best option is to use version-less namespaces, as these will automatically use the latest available version of Spring Integration.
Declaring a version-less Spring Integration namespace:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:int="http://www.springframework.org/schema/integration" xsi:schemaLocation="http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> ... </beans>
Declaring a Spring Integration namespace using an explicit version:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:int="http://www.springframework.org/schema/integration" xsi:schemaLocation="http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-2.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> ... </beans>
The old 1.0 and 2.0 schemas are still there, but if an Application Context still references one of those deprecated schemas, the validator will fail on initialization.
Since version 2.0, the Spring Integration project uses Git for version control. In order to increase community visibility even further, the project was moved from SpringSource hosted Git repositories to Github. The Spring Integration Git repository is located at:null
For the project we also improved the process of providing code contributions and we ensure that every commit is peer-reviewed. In fact, core committers now follow the same process as contributors. For more details please see:
null
In an effort to provide better source code visibility and consequently to monitor the quality of Spring Integration’s source code, an instance of Sonar was setup and metrics are gathered nightly and made avaiblable at:
null
For the 2.1 release of Spring Integration we also expanded the Spring Integration Samples project and added many new samples, e.g. samples covering AMQP support, the new payload enricher, a sample illustrating techniques for testing Spring Integration flow fragments, as well as an example for executing Stored Procedures against Oracle. For details please visit:
null
For a detailed migration guide in regards to upgrading an existing application that uses Spring Integration older than version 2.0, please see:
null
Spring Integration 2.0 is built on top of Spring 3.0.5 and makes many of its features available to our users.
You can now use SpEL expressions within the transformer, router, filter, splitter, aggregator, service-activator, header-enricher, and many more elements of the Spring Integration core namespace as well as various adapters. There are many samples provided throughout this manual.
You can now benefit from Conversion Service support provided with Spring while configuring many Spring Integration components such as Datatype Channel. See Section 4.1.2, “Message Channel Implementations” as well Section 8.4.1, “Introduction”. Also, the SpEL support mentioned in the previous point also relies upon the ConversionService. Therefore, you can register Converters once, and take advantage of them anywhere you are using SpEL expressions.
Spring 3.0 defines two new strategies related to scheduling: TaskScheduler and Trigger Spring Integration (which uses a lot of scheduling) now builds upon these. In fact, Spring Integration 1.0 had originally defined some of the components (e.g. CronTrigger) that have now been migrated into Spring 3.0’s core API. Now, you can benefit from reusing the same components within the entire Application Context (not just Spring Integration configuration). Configuration of Spring Integration Pollers has been greatly simplified as well by providing attributes for directly configuring rates, delays, cron expressions, and trigger references. See Section 4.3, “Channel Adapter” for sample configurations.
Our outbound HTTP adapters now delegate to Spring’s RestTemplate for executing the HTTP request and handling its response. This also means that you can reuse any custom HttpMessageConverter implementations. See Section 17.3, “Http Outbound Components” for more details.
Also in 2.0 we have added support for even more of the patterns described in Hohpe and Woolf’s Enterprise Integration Patterns book.
We now provide support for the Message History pattern allowing you to keep track of all traversed components, including the name of each channel and endpoint as well as the timestamp of that traversal. See Section 9.3, “Message History” for more details.
We now provide support for the Message Store pattern. The Message Store provides a strategy for persisting messages on behalf of any process whose scope extends beyond a single transaction, such as the Aggregator and Resequencer. Many sections of this document provide samples on how to use a Message Store as it affects several areas of Spring Integration. See Section 9.4, “Message Store”, Section 7.3, “Claim Check”, Section 4.1, “Message Channels”, Section 6.4, “Aggregator”, Chapter 18, JDBC Support, and Section 6.5, “Resequencer” for more details
We have added an implementation of the Claim Check pattern. The idea behind the Claim Check pattern is that you can exchange a Message payload for a "claim ticket" and vice-versa. This allows you to reduce bandwidth and/or avoid potential security issues when sending Messages across channels. See Section 7.3, “Claim Check” for more details.
We have provided implementations of the Control Bus pattern which allows you to use messaging to manage and monitor endpoints and channels. The implementations include both a SpEL-based approach and one that executes Groovy scripts. See Section 9.6, “Control Bus” and Section 8.7.2, “Control Bus” for more details.
We have added several new Channel Adapters and Messaging Gateways in Spring Integration 2.0.
We have added Channel Adapters for receiving and sending messages over the TCP and UDP internet protocols. See Chapter 31, TCP and UDP Support for more details. Also, you can checkout the following blog: TCP/UDP support
Twitter adapters provides support for sending and receiving Twitter Status updates as well as Direct Messages. You can also perform Twitter Searches with an inbound Channel Adapter. See Chapter 32, Twitter Support for more details.
The new XMPP adapters support both Chat Messages and Presence events. See Chapter 36, XMPP Support for more details.
Inbound and outbound File transfer support over FTP/FTPS is now available. See Chapter 15, FTP/FTPS Adapters for more details.
Inbound and outbound File transfer support over SFTP is now available. See Chapter 27, SFTP Adapters for more details.
We have also added Channel Adapters for receiving news feeds (ATOM/RSS). See Chapter 13, Feed Adapter for more details.
With Spring Integration 2.0 we’ve added Groovy support allowing you to use Groovy scripting language to provide integration and/or business logic. See Section 8.7, “Groovy support” for more details.
These symmetrical transformers convert payload objects to and from a Map. See Section 7.1, “Transformer” for more details.
These symmetrical transformers convert payload objects to and from JSON. See Section 7.1, “Transformer” for more details.
These symmetrical transformers convert payload objects to and from byte arrays. They also support the Serializer and Deserializer strategy interfaces that have been added as of Spring 3.0.5. See Section 7.1, “Transformer” for more details.
The core API went through some significant refactoring to make it simpler and more usable. Although we anticipate that the impact to the end user should be minimal, please read through this document to find what was changed. Especially, visit Section 6.1.5, “Dynamic Routers” , Section 8.3, “Messaging Gateways”, Section 17.3, “Http Outbound Components”, Section 5.1, “Message”, and Section 6.4, “Aggregator” for more details. If you are depending directly on some of the core components (Message, MessageHeaders, MessageChannel, MessageBuilder, etc.), you will notice that you need to update any import statements. We restructured some packaging to provide the flexibility we needed for extending the domain model while avoiding any cyclical dependencies (it is a policy of the framework to avoid such "tangles").
With Spring Integration 2.0 we have switched our build environment to use Git for source control. To access our repository simply follow this URL: http://git.springsource.org/spring-integration. We have also switched our build system to Gradle.
With Spring Integration 2.0 we have decoupled the samples from our main release distribution. Please read this blog to get more info New Spring Integration Samples We have also created many new samples, including samples for every new Adapter.
There is an amazing new visual editor for Spring Integration included within the latest version of SpringSource Tool Suite. If you are not already using STS, please download it here: