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when sending a message, the return value will be true if the message is sent successfully. internally, this implementation is quite similar to the queuechannel except that it uses a synchronousqueue (a zero-capacity implementation of blockingqueue). for example, if a handler is subscribed to a directchannel, then sending a message to that channel will trigger invocation of that handler’s handlemessage(message) method directly in the sender’s thread, before the send() method invocation can return. however, since version 3.0 you can provide your own implementation of the loadbalancingstrategy and inject it using load-balancer-ref attribute which should point to a bean that implements loadbalancingstrategy. the reason for this is that when a message is sent to a subscribablechannel it will be sent directly to one or more subscribers depending on the type of channel (e.g. it is a simple interceptor that sends the message to another channel without otherwise altering the existing flow. of course the first thing that comes to mind is message filter. this of course would work, but a simpler way of accomplishing the same thing is to apply the datatype channel pattern. when a queuechannel receives a message, it will add it to the message store, and when a message is polled from a queuechannel, it is removed from the message store. that is a blockingqueue implementation to utilize the messagegroupstore operations. the message store must be a prioritycapablechannelmessagestore and, in this case.
the order attribute allows you to manage where this interceptor will be injected if there are multiple interceptors on a given channel. that is one of the primary benefits of the message channel abstraction. it is not just an internal, implicit realization of the eip pattern, it is fully exposed as a configurable component to the end user. it is possible to configure a global wire tap as a special case of the the section called “global channel interceptor configuration”. a channel adapter connected to a channel that implements the org.springframework.messaging.subscribablechannel interface will produce an instance of eventdrivenconsumer. the pollskipadvice can be used to suppress (skip) a poll, perhaps because there is some downstream condition that would prevent the message to be processed properly. this advice is a simple implementation of abstractmessagesourceadvice, when used in conjunction with a dynamicperiodictrigger, it adjusts the polling frequency depending on whether or not the previous poll resulted in a message or not. when the advice detects that no message is received, it adds the secondary trigger to the compoundtrigger. when the adapter’s subscription is activated, a poller will attempt to receive messages from the source. of course, the script can generate and return a complete message object with headers and payload, or just a payload, which will be added to a message with basic headers. the
spring integration provides several different message channel implementations. keep in mind that all of these queue-based channels are storing messages for example, if a handler is subscribed to a directchannel , then sending a queuechannel is an example of pollable channel. spring integration queue channel sample. for example : it may be used to transform message payload from one format to another or to modify message header values. also spring integration provides various channel , spring integration send message to multiple channels, spring integration send message to multiple channels, spring integration documentation, spring integration multiple input channels, spring integration transformer example.
for example, if the message was created from data coming from an external source (like a jms [java message service] for example, imagine we have a now the channel can queue up to five messages in spring integration, a channel is represented by the interface messagechannel and spring provides , spring integration poller, spring integration message, spring integration message, spring integration metrics, messageendpoint spring integration
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