Initial Commit
Migrating the existing structure from the following location: https://github.com/spring-cloud-stream-app-starters/stream-applications/tree/restructuring
This commit is contained in:
Soby Chacko
23
applications/processor/transform-processor/README.adoc
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23
applications/processor/transform-processor/README.adoc
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//tag::ref-doc[]
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= Transform Processor
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Transformer processor allows you to convert the message payload structure based on a SpEL expression.
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Here is an example of how you can run this application.
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`java -jar filter-processor-kafka-<version>.jar --spel.function.expression=toUpperCase()`
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Change kafka to rabbit if you want to run it against RabbitMQ.
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=== Payload
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Incoming message can contain any type of payload.
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== Options
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//tag::configuration-properties[]
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$$spel.function.expression$$:: $$A SpEL expression to apply.$$ *($$String$$, default: `$$<none>$$`)*
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//end::configuration-properties[]
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//end::ref-doc[]
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91
applications/processor/transform-processor/pom.xml
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91
applications/processor/transform-processor/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>transform-processor</artifactId>
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<version>3.0.0.BUILD-SNAPSHOT</version>
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<name>transform-processor</name>
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<description>transform processor apps</description>
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<packaging>jar</packaging>
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<parent>
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<groupId>org.springframework.cloud.stream.app</groupId>
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<artifactId>stream-apps-parent</artifactId>
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<version>3.0.0.BUILD-SNAPSHOT</version>
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<relativePath/>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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<exclusions>
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<exclusion>
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<groupId>org.junit.vintage</groupId>
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<artifactId>junit-vintage-engine</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>org.springframework.cloud.function</groupId>
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<artifactId>spel-function</artifactId>
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<version>${java-functions.version}</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-app-starter-doc-maven-plugin</artifactId>
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</plugin>
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<plugin>
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<groupId>org.springframework.cloud.stream.app.plugin</groupId>
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<artifactId>spring-cloud-stream-app-maven-plugin</artifactId>
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<configuration>
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<generatedApp>
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<name>transform</name>
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<type>processor</type>
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<version>${project.version}</version>
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<configClass>org.springfamework.cloud.fn.spel.SpelFunctionConfiguration.class</configClass>
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<functionDefinition>byteArrayTextToString|spelFunction</functionDefinition>
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</generatedApp>
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<dependencies>
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<dependency>
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<groupId>org.springframework.cloud.fn</groupId>
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<artifactId>spel-function</artifactId>
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<version>${java-functions.version}</version>
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</dependency>
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</dependencies>
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<containerImage>
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<enableMetadata>true</enableMetadata>
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</containerImage>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<repositories>
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<repository>
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<snapshots>
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<enabled>true</enabled>
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</snapshots>
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<id>spring-snapshots</id>
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<name>Spring Snapshots</name>
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<url>https://repo.spring.io/libs-snapshot-local</url>
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</repository>
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<repository>
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<snapshots>
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<enabled>false</enabled>
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</snapshots>
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<id>spring-milestones</id>
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<name>Spring Milestones</name>
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<url>https://repo.spring.io/libs-milestone-local</url>
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</repository>
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</repositories>
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</project>
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configuration-properties.classes=org.springframework.cloud.fn.spel.SpelFunctionProperties
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/*
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* Copyright 2020 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.cloud.stream.app.transform.processor;
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import java.nio.charset.StandardCharsets;
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import org.junit.jupiter.api.Test;
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import org.springframework.boot.WebApplicationType;
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import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
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import org.springframework.boot.builder.SpringApplicationBuilder;
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import org.springframework.cloud.fn.spel.SpelFunctionConfiguration;
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import org.springframework.cloud.stream.binder.test.InputDestination;
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import org.springframework.cloud.stream.binder.test.OutputDestination;
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import org.springframework.cloud.stream.binder.test.TestChannelBinderConfiguration;
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import org.springframework.context.ConfigurableApplicationContext;
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import org.springframework.context.annotation.Import;
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import org.springframework.messaging.Message;
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import org.springframework.messaging.support.GenericMessage;
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import static org.assertj.core.api.Assertions.assertThat;
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public class TransformProcessorTests {
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@Test
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public void testTransformProcessor() {
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try (ConfigurableApplicationContext context = new SpringApplicationBuilder(
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TestChannelBinderConfiguration.getCompleteConfiguration(TransformProcessorConfiguration.class))
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.web(WebApplicationType.NONE)
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.run("--spring.cloud.function.definition=byteArrayTextToString|spelFunction",
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"--spel.function.expression=payload.toUpperCase()")) {
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InputDestination processorInput = context.getBean(InputDestination.class);
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OutputDestination processorOutput = context.getBean(OutputDestination.class);
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String payload = "hello world";
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processorInput.send(new GenericMessage<>(payload.getBytes(StandardCharsets.UTF_8)));
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Message<byte[]> sourceMessage = processorOutput.receive(10000);
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assertThat(new String(sourceMessage.getPayload())).isEqualTo(payload.toUpperCase());
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}
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}
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@EnableAutoConfiguration
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@Import({ SpelFunctionConfiguration.class })
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public static class TransformProcessorConfiguration {}
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}
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