“seda + concurrentConsumers"有什么区别?和“直接+线程"；
Apache Camel 提供两种使用线程池的解决方案:
Apache Camel provide two solutions for using thread pool:
from("seda:stageName?concurrentConsumers=5").process(...)
和
from("direct:stageName").thread(5).process(...)
我想知道，这两种解决方案有什么区别?是否只是两种写相同的东西?有哪些用例?
I would like to know, what is the difference between the two solutions ? Is it just two kind of write the same thing or not ? What are the use cases ?
推荐答案
SEDA 组件
seda: 组件 提供异步 SEDA 行为，以便在 BlockingQueue 上交换消息，并在与生产者不同的线程中调用消费者.
SEDA Component
The seda: component provides asynchronous SEDA behavior so that messages are exchanged on a BlockingQueue and consumers are invoked in a separate thread to the producer.
direct: 组件 在生产者发送消息交换时提供任何消费者的直接、同步调用.此端点可用于连接现有路由，或者如果与路由器位于同一 JVM 中的客户端想要访问路由.
The direct: component provides direct, synchronous invocation of any consumers when a producer sends a message exchange. This endpoint can be used to connect existing routes or if a client in the same JVM as the router wants to access the routes.
线程池是一个可以在运行时根据负载动态增加/收缩的池，并发消费者始终是固定的.
The thread pool is a pool that dynamically can increase/shrink at runtime depending on load, the concurrent consumers is always fixed.
比如，就你而言，
并发消费者 - from("seda:stageName?concurrentConsumers=5").process(...)
对于线程池 - from("direct:stageName").thread(5).process(...)
现在，如果您总是希望有 5 个线程可用，请使用 Concurrent Consumers 并且如果您希望线程根据负载可用(但不超过 5 个)然后使用线程池.
Now,if you always want to have 5 threads available then use Concurrent Consumers and if you want the threads to be available as per the load(but not more than 5)
then use Thread Pool.
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