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FunctionsTests.kt
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FunctionsTests.kt
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/*
* Copyright 2018-2019 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
*
* https://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.function
import assertk.assertThat
import assertk.assertions.isEqualTo
import assertk.assertions.isNotNull
import assertk.assertions.isTrue
import assertk.assertions.size
import org.junit.jupiter.api.Test
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.beans.factory.annotation.Qualifier
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import org.springframework.integration.annotation.EndpointId
import org.springframework.integration.annotation.InboundChannelAdapter
import org.springframework.integration.annotation.Poller
import org.springframework.integration.annotation.ServiceActivator
import org.springframework.integration.annotation.Transformer
import org.springframework.integration.channel.DirectChannel
import org.springframework.integration.channel.QueueChannel
import org.springframework.integration.config.EnableIntegration
import org.springframework.integration.dsl.IntegrationFlows
import org.springframework.integration.endpoint.SourcePollingChannelAdapter
import org.springframework.messaging.Message
import org.springframework.messaging.MessageChannel
import org.springframework.messaging.PollableChannel
import org.springframework.messaging.SubscribableChannel
import org.springframework.messaging.support.GenericMessage
import org.springframework.messaging.support.MessageBuilder
import org.springframework.test.annotation.DirtiesContext
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig
import reactor.core.publisher.Mono
import reactor.test.StepVerifier
import java.util.*
import java.util.concurrent.CountDownLatch
import java.util.concurrent.TimeUnit
import java.util.function.Function
/**
* @author Artem Bilan
*
* @since 5.1
*/
@SpringJUnitConfig
@DirtiesContext
class FunctionsTests {
@Autowired
private lateinit var functionServiceChannel: MessageChannel
@Autowired
private lateinit var messageConsumerServiceChannel: MessageChannel
@Autowired
private lateinit var messageCollector: ArrayList<Message<Any>>
@Autowired
private lateinit var counterChannel: SubscribableChannel
@Autowired
@Qualifier("kotlinSupplierChannelAdapter")
private lateinit var kotlinSupplierInboundChannelAdapter: SourcePollingChannelAdapter
@Autowired
private lateinit var fromSupplierQueue: PollableChannel
@Test
fun `invoke function via transformer`() {
val replyChannel = QueueChannel()
val message = MessageBuilder.withPayload("foo")
.setReplyChannel(replyChannel)
.build()
this.functionServiceChannel.send(message)
val receive = replyChannel.receive(10000)
val payload = receive?.payload
assertThat(payload)
.isNotNull()
.isEqualTo("FOO")
}
@Test
fun `invoke consumer via service activator`() {
this.messageConsumerServiceChannel.send(GenericMessage("bar"))
assertThat(this.messageCollector).size().isEqualTo(1)
val message = this.messageCollector[0]
assertThat(message.payload).isEqualTo("bar")
}
@Test
fun `verify supplier`() {
val countDownLatch = CountDownLatch(10)
this.counterChannel.subscribe { countDownLatch.countDown() }
this.kotlinSupplierInboundChannelAdapter.start()
assertThat(countDownLatch.await(10, TimeUnit.SECONDS)).isTrue()
}
@Test
fun `verify supplier flow`() {
assertThat(this.fromSupplierQueue.receive(10_000)).isNotNull()
}
@Autowired
private lateinit var monoFunction: Function<String, Mono<Message<*>>>
@Test
fun `verify Mono gateway`() {
val mono = this.monoFunction.apply("test")
StepVerifier.create(mono.map(Message<*>::getPayload).cast(String::class.java))
.expectNext("TEST")
.verifyComplete()
}
@Configuration
@EnableIntegration
class Config {
@Bean
@Transformer(inputChannel = "functionServiceChannel")
fun kotlinFunction(): (String) -> String {
return { it.toUpperCase() }
}
@Bean
fun messageCollector() = ArrayList<Message<Any>>()
@Bean
@ServiceActivator(inputChannel = "messageConsumerServiceChannel")
fun kotlinConsumer(): (Message<Any>) -> Unit {
return { messageCollector().add(it) }
}
@Bean
fun counterChannel() = DirectChannel()
@Bean
@InboundChannelAdapter(value = "counterChannel", autoStartup = "false",
poller = [Poller(fixedRate = "10", maxMessagesPerPoll = "1")])
@EndpointId("kotlinSupplierChannelAdapter")
fun kotlinSupplier(): () -> String {
return { "baz" }
}
@Bean
fun flowFromSupplier() =
IntegrationFlows.from<String>({ "" }) { e -> e.poller { p -> p.fixedDelay(10).maxMessagesPerPoll(1) } }
.transform<String, String> { "blank" }
.channel { c -> c.queue("fromSupplierQueue") }
.get()
@Bean
fun monoFunctionGateway() =
IntegrationFlows.from(MonoFunction::class.java)
.handle<String>({ p, _ -> Mono.just(p).map(String::toUpperCase) }) { e -> e.async(true) }
.get()
}
interface MonoFunction : Function<String, Mono<Message<*>>>
}