mirror of
https://github.com/wahyd4/spring-cloud-stream-samples.git
synced 2026-08-09 05:16:18 +10:00
StreamListener basic sample cleanup
This commit is contained in:
Soby Chacko
@@ -8,9 +8,9 @@ spring:
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destination: dataIn
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binder: kafka1
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group: testGroup
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output:
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destination: dataOut
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binder: kafka2
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# output:
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# destination: dataOut
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# binder: kafka2
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binders:
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kafka1:
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type: kafka
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@@ -22,13 +22,13 @@ spring:
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binder:
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brokers: ${kafkaBroker1}
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zkNodes: ${zk1}
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kafka2:
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type: kafka
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environment:
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spring:
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cloud:
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stream:
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kafka:
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binder:
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brokers: ${kafkaBroker2}
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zkNodes: ${zk2}
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# kafka2:
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# type: kafka
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# environment:
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# spring:
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# cloud:
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# stream:
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# kafka:
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# binder:
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# brokers: ${kafkaBroker2}
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# zkNodes: ${zk2}
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@@ -23,6 +23,7 @@
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<modules>
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<module>jdbc-sink</module>
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<module>jdbc-source</module>
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<module>stream-listener-basic</module>
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<module>dynamic-source</module>
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<module>transform</module>
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<module>double</module>
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@@ -30,7 +31,6 @@
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<!--<module>multibinder</module>-->
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<module>multibinder-differentsystems</module>
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<module>multi-io</module>
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<module>stream-listener</module>
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<module>reactive-processor-kafka</module>
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<module>test-embedded-kafka</module>
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<module>kinesis-produce-consume</module>
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Symlink
+1
@@ -0,0 +1 @@
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../.mvn
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@@ -0,0 +1,58 @@
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Spring Cloud Stream StreamListener Basic Sample
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================================================
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In this *Spring Cloud Stream* sample, the application shows how to use StreamListener support to enable message mapping and automatic type conversion.
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## Requirements
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To run this sample, you will need to have installed:
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* Java 8 or Above
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## Code Tour
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This sample is a Spring Boot application that bundles multiple application together to showcase how to use StreamListener to enable message mapping and automatic type conversion.
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* TypeConversionApplication - the Spring Boot Main Application
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* POJO's - Simple data classes - `Foo` and `Bar`
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* SampleSource - the app that generates JSON string of the form `"{\"value\":\"hi\"}"` and then send that to an outbound channnel.
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* SampleTransformer - the app that has the method annotated with `@StreamListener` to map the process input channel to a type `Bar`.
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The annotation @SendTo on the `StreamListener` method will make sure to send the output to the provided output channel.
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* SampleSink - the app that receives the converted message from the transformer output as type `Foo`.
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Please note that the applications (SampleSource, SampleTransformer and SampleSink) are bundled inside the single application for the demo purpose only.
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In practice, these applications run on their own.
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If at all they need to be bundled together, the best practice is to use `AggregateApplicationBuilder`.
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Refer the sample `double` for more info on aggregate application.
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## Running the application
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The following instructions assume that you are running Kafka as a Docker image.
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* Go to the application root
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* `docker-compose up -d`
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* `./mvnw clean package`
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* `java -jar target/streamlistener-basic-0.0.1-SNAPSHOT.jar`
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The application will log messages from source, transformer and sink.
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Source sends a message every second which will initiate the processor and then the sink.
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If you want to change this frequency, modify the `fixedDelay` parameter in the Source for the `InboundChannelAdapter`.
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By default, you will see output similar to the following every second.
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```
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******************
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At the Source
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******************
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Sending value: {"value":"hi"}
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******************
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At the transformer
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******************
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Received value hi of type class demo.Bar
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Transforming the value to HI and with the type class demo.Bar
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******************
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At the Sink
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******************
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Received transformed message HI of type class demo.Foo
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```
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@@ -0,0 +1,18 @@
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version: '2'
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services:
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kafka:
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image: wurstmeister/kafka
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ports:
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- "9092:9092"
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environment:
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- KAFKA_ADVERTISED_HOST_NAME=127.0.0.1
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- KAFKA_ADVERTISED_PORT=9092
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- KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181
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depends_on:
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- zookeeper
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zookeeper:
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image: wurstmeister/zookeeper
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ports:
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- "2181:2181"
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environment:
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- KAFKA_ADVERTISED_HOST_NAME=zookeeper
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+226
@@ -0,0 +1,226 @@
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#!/bin/sh
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# ----------------------------------------------------------------------------
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# Licensed to the Apache Software Foundation (ASF) under one
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||||
# or more contributor license agreements. See the NOTICE file
|
||||
# distributed with this work for additional information
|
||||
# regarding copyright ownership. The ASF licenses this file
|
||||
# to you 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
|
||||
#
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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,
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||||
# 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.
|
||||
# ----------------------------------------------------------------------------
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||||
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# ----------------------------------------------------------------------------
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# Maven2 Start Up Batch script
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#
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# Required ENV vars:
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# ------------------
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# JAVA_HOME - location of a JDK home dir
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#
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# Optional ENV vars
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# -----------------
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# M2_HOME - location of maven2's installed home dir
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||||
# MAVEN_OPTS - parameters passed to the Java VM when running Maven
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||||
# e.g. to debug Maven itself, use
|
||||
# set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
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||||
# MAVEN_SKIP_RC - flag to disable loading of mavenrc files
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# ----------------------------------------------------------------------------
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if [ -z "$MAVEN_SKIP_RC" ] ; then
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if [ -f /etc/mavenrc ] ; then
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. /etc/mavenrc
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fi
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||||
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if [ -f "$HOME/.mavenrc" ] ; then
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||||
. "$HOME/.mavenrc"
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||||
fi
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||||
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||||
fi
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||||
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||||
# OS specific support. $var _must_ be set to either true or false.
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cygwin=false;
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darwin=false;
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mingw=false
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case "`uname`" in
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CYGWIN*) cygwin=true ;;
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MINGW*) mingw=true;;
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Darwin*) darwin=true
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||||
# Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
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||||
# See https://developer.apple.com/library/mac/qa/qa1170/_index.html
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if [ -z "$JAVA_HOME" ]; then
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if [ -x "/usr/libexec/java_home" ]; then
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||||
export JAVA_HOME="`/usr/libexec/java_home`"
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||||
else
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||||
export JAVA_HOME="/Library/Java/Home"
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||||
fi
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||||
fi
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||||
;;
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||||
esac
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||||
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||||
if [ -z "$JAVA_HOME" ] ; then
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||||
if [ -r /etc/gentoo-release ] ; then
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||||
JAVA_HOME=`java-config --jre-home`
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||||
fi
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||||
fi
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||||
|
||||
if [ -z "$M2_HOME" ] ; then
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## resolve links - $0 may be a link to maven's home
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PRG="$0"
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# need this for relative symlinks
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while [ -h "$PRG" ] ; do
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ls=`ls -ld "$PRG"`
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link=`expr "$ls" : '.*-> \(.*\)$'`
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||||
if expr "$link" : '/.*' > /dev/null; then
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||||
PRG="$link"
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else
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PRG="`dirname "$PRG"`/$link"
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||||
fi
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||||
done
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saveddir=`pwd`
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||||
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||||
M2_HOME=`dirname "$PRG"`/..
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||||
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||||
# make it fully qualified
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M2_HOME=`cd "$M2_HOME" && pwd`
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||||
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cd "$saveddir"
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# echo Using m2 at $M2_HOME
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||||
fi
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||||
|
||||
# For Cygwin, ensure paths are in UNIX format before anything is touched
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||||
if $cygwin ; then
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||||
[ -n "$M2_HOME" ] &&
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||||
M2_HOME=`cygpath --unix "$M2_HOME"`
|
||||
[ -n "$JAVA_HOME" ] &&
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||||
JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
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||||
[ -n "$CLASSPATH" ] &&
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||||
CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
|
||||
fi
|
||||
|
||||
# For Migwn, ensure paths are in UNIX format before anything is touched
|
||||
if $mingw ; then
|
||||
[ -n "$M2_HOME" ] &&
|
||||
M2_HOME="`(cd "$M2_HOME"; pwd)`"
|
||||
[ -n "$JAVA_HOME" ] &&
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||||
JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
|
||||
# TODO classpath?
|
||||
fi
|
||||
|
||||
if [ -z "$JAVA_HOME" ]; then
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||||
javaExecutable="`which javac`"
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||||
if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
|
||||
# readlink(1) is not available as standard on Solaris 10.
|
||||
readLink=`which readlink`
|
||||
if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
|
||||
if $darwin ; then
|
||||
javaHome="`dirname \"$javaExecutable\"`"
|
||||
javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
|
||||
else
|
||||
javaExecutable="`readlink -f \"$javaExecutable\"`"
|
||||
fi
|
||||
javaHome="`dirname \"$javaExecutable\"`"
|
||||
javaHome=`expr "$javaHome" : '\(.*\)/bin'`
|
||||
JAVA_HOME="$javaHome"
|
||||
export JAVA_HOME
|
||||
fi
|
||||
fi
|
||||
fi
|
||||
|
||||
if [ -z "$JAVACMD" ] ; then
|
||||
if [ -n "$JAVA_HOME" ] ; then
|
||||
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
|
||||
# IBM's JDK on AIX uses strange locations for the executables
|
||||
JAVACMD="$JAVA_HOME/jre/sh/java"
|
||||
else
|
||||
JAVACMD="$JAVA_HOME/bin/java"
|
||||
fi
|
||||
else
|
||||
JAVACMD="`which java`"
|
||||
fi
|
||||
fi
|
||||
|
||||
if [ ! -x "$JAVACMD" ] ; then
|
||||
echo "Error: JAVA_HOME is not defined correctly." >&2
|
||||
echo " We cannot execute $JAVACMD" >&2
|
||||
exit 1
|
||||
fi
|
||||
|
||||
if [ -z "$JAVA_HOME" ] ; then
|
||||
echo "Warning: JAVA_HOME environment variable is not set."
|
||||
fi
|
||||
|
||||
CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
|
||||
|
||||
# traverses directory structure from process work directory to filesystem root
|
||||
# first directory with .mvn subdirectory is considered project base directory
|
||||
find_maven_basedir() {
|
||||
|
||||
if [ -z "$1" ]
|
||||
then
|
||||
echo "Path not specified to find_maven_basedir"
|
||||
return 1
|
||||
fi
|
||||
|
||||
basedir="$1"
|
||||
wdir="$1"
|
||||
while [ "$wdir" != '/' ] ; do
|
||||
if [ -d "$wdir"/.mvn ] ; then
|
||||
basedir=$wdir
|
||||
break
|
||||
fi
|
||||
# workaround for JBEAP-8937 (on Solaris 10/Sparc)
|
||||
if [ -d "${wdir}" ]; then
|
||||
wdir=`cd "$wdir/.."; pwd`
|
||||
fi
|
||||
# end of workaround
|
||||
done
|
||||
echo "${basedir}"
|
||||
}
|
||||
|
||||
# concatenates all lines of a file
|
||||
concat_lines() {
|
||||
if [ -f "$1" ]; then
|
||||
echo "$(tr -s '\n' ' ' < "$1")"
|
||||
fi
|
||||
}
|
||||
|
||||
BASE_DIR=`find_maven_basedir "$(pwd)"`
|
||||
if [ -z "$BASE_DIR" ]; then
|
||||
exit 1;
|
||||
fi
|
||||
|
||||
export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
|
||||
echo $MAVEN_PROJECTBASEDIR
|
||||
MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
|
||||
|
||||
# For Cygwin, switch paths to Windows format before running java
|
||||
if $cygwin; then
|
||||
[ -n "$M2_HOME" ] &&
|
||||
M2_HOME=`cygpath --path --windows "$M2_HOME"`
|
||||
[ -n "$JAVA_HOME" ] &&
|
||||
JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
|
||||
[ -n "$CLASSPATH" ] &&
|
||||
CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
|
||||
[ -n "$MAVEN_PROJECTBASEDIR" ] &&
|
||||
MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
|
||||
fi
|
||||
|
||||
WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
|
||||
|
||||
"$JAVACMD" \
|
||||
$MAVEN_OPTS \
|
||||
-classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
|
||||
"-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
|
||||
${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
|
||||
|
||||
Vendored
+145
@@ -0,0 +1,145 @@
|
||||
@REM ----------------------------------------------------------------------------
|
||||
@REM Licensed to the Apache Software Foundation (ASF) under one
|
||||
@REM or more contributor license agreements. See the NOTICE file
|
||||
@REM distributed with this work for additional information
|
||||
@REM regarding copyright ownership. The ASF licenses this file
|
||||
@REM to you under the Apache License, Version 2.0 (the
|
||||
@REM "License"); you may not use this file except in compliance
|
||||
@REM with the License. You may obtain a copy of the License at
|
||||
@REM
|
||||
@REM http://www.apache.org/licenses/LICENSE-2.0
|
||||
@REM
|
||||
@REM Unless required by applicable law or agreed to in writing,
|
||||
@REM software distributed under the License is distributed on an
|
||||
@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
||||
@REM KIND, either express or implied. See the License for the
|
||||
@REM specific language governing permissions and limitations
|
||||
@REM under the License.
|
||||
@REM ----------------------------------------------------------------------------
|
||||
|
||||
@REM ----------------------------------------------------------------------------
|
||||
@REM Maven2 Start Up Batch script
|
||||
@REM
|
||||
@REM Required ENV vars:
|
||||
@REM JAVA_HOME - location of a JDK home dir
|
||||
@REM
|
||||
@REM Optional ENV vars
|
||||
@REM M2_HOME - location of maven2's installed home dir
|
||||
@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
|
||||
@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a key stroke before ending
|
||||
@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
|
||||
@REM e.g. to debug Maven itself, use
|
||||
@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
|
||||
@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
|
||||
@REM ----------------------------------------------------------------------------
|
||||
|
||||
@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
|
||||
@echo off
|
||||
@REM enable echoing my setting MAVEN_BATCH_ECHO to 'on'
|
||||
@if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO%
|
||||
|
||||
@REM set %HOME% to equivalent of $HOME
|
||||
if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
|
||||
|
||||
@REM Execute a user defined script before this one
|
||||
if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
|
||||
@REM check for pre script, once with legacy .bat ending and once with .cmd ending
|
||||
if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
|
||||
if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
|
||||
:skipRcPre
|
||||
|
||||
@setlocal
|
||||
|
||||
set ERROR_CODE=0
|
||||
|
||||
@REM To isolate internal variables from possible post scripts, we use another setlocal
|
||||
@setlocal
|
||||
|
||||
@REM ==== START VALIDATION ====
|
||||
if not "%JAVA_HOME%" == "" goto OkJHome
|
||||
|
||||
echo.
|
||||
echo Error: JAVA_HOME not found in your environment. >&2
|
||||
echo Please set the JAVA_HOME variable in your environment to match the >&2
|
||||
echo location of your Java installation. >&2
|
||||
echo.
|
||||
goto error
|
||||
|
||||
:OkJHome
|
||||
if exist "%JAVA_HOME%\bin\java.exe" goto init
|
||||
|
||||
echo.
|
||||
echo Error: JAVA_HOME is set to an invalid directory. >&2
|
||||
echo JAVA_HOME = "%JAVA_HOME%" >&2
|
||||
echo Please set the JAVA_HOME variable in your environment to match the >&2
|
||||
echo location of your Java installation. >&2
|
||||
echo.
|
||||
goto error
|
||||
|
||||
@REM ==== END VALIDATION ====
|
||||
|
||||
:init
|
||||
|
||||
set MAVEN_CMD_LINE_ARGS=%*
|
||||
|
||||
@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
|
||||
@REM Fallback to current working directory if not found.
|
||||
|
||||
set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
|
||||
IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
|
||||
|
||||
set EXEC_DIR=%CD%
|
||||
set WDIR=%EXEC_DIR%
|
||||
:findBaseDir
|
||||
IF EXIST "%WDIR%"\.mvn goto baseDirFound
|
||||
cd ..
|
||||
IF "%WDIR%"=="%CD%" goto baseDirNotFound
|
||||
set WDIR=%CD%
|
||||
goto findBaseDir
|
||||
|
||||
:baseDirFound
|
||||
set MAVEN_PROJECTBASEDIR=%WDIR%
|
||||
cd "%EXEC_DIR%"
|
||||
goto endDetectBaseDir
|
||||
|
||||
:baseDirNotFound
|
||||
set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
|
||||
cd "%EXEC_DIR%"
|
||||
|
||||
:endDetectBaseDir
|
||||
|
||||
IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
|
||||
|
||||
@setlocal EnableExtensions EnableDelayedExpansion
|
||||
for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
|
||||
@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
|
||||
|
||||
:endReadAdditionalConfig
|
||||
|
||||
SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
|
||||
|
||||
set WRAPPER_JAR="".\.mvn\wrapper\maven-wrapper.jar""
|
||||
set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
|
||||
|
||||
%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CMD_LINE_ARGS%
|
||||
if ERRORLEVEL 1 goto error
|
||||
goto end
|
||||
|
||||
:error
|
||||
set ERROR_CODE=1
|
||||
|
||||
:end
|
||||
@endlocal & set ERROR_CODE=%ERROR_CODE%
|
||||
|
||||
if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
|
||||
@REM check for post script, once with legacy .bat ending and once with .cmd ending
|
||||
if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
|
||||
if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
|
||||
:skipRcPost
|
||||
|
||||
@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
|
||||
if "%MAVEN_BATCH_PAUSE%" == "on" pause
|
||||
|
||||
if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
|
||||
|
||||
exit /B %ERROR_CODE%
|
||||
@@ -4,11 +4,11 @@
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
<groupId>spring.cloud.stream.samples</groupId>
|
||||
<artifactId>streamlistener-basic-sample</artifactId>
|
||||
<artifactId>streamlistener-basic</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
|
||||
<packaging>jar</packaging>
|
||||
|
||||
<name>streamlistener-basic-sample</name>
|
||||
<name>streamlistener-basic</name>
|
||||
<description>Demo project for Spring Boot</description>
|
||||
|
||||
<parent>
|
||||
@@ -22,10 +22,14 @@
|
||||
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
|
||||
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
|
||||
<java.version>1.8</java.version>
|
||||
<spring-cloud.version>Finchley.M7</spring-cloud.version>
|
||||
<spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version>
|
||||
</properties>
|
||||
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>org.springframework.boot</groupId>
|
||||
<artifactId>spring-boot-starter-actuator</artifactId>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.springframework.boot</groupId>
|
||||
<artifactId>spring-boot-starter</artifactId>
|
||||
+2
-2
@@ -29,11 +29,11 @@ public class SampleSink {
|
||||
|
||||
// Sink application definition
|
||||
@StreamListener(Sink.SAMPLE)
|
||||
public void receive(Foo fooMessage) {
|
||||
public void receive(Foo foo) {
|
||||
System.out.println("******************");
|
||||
System.out.println("At the Sink");
|
||||
System.out.println("******************");
|
||||
System.out.println("Received transformed message " + fooMessage.getValue() + " of type " + fooMessage.getClass());
|
||||
System.out.println("Received transformed message " + foo.getValue() + " of type " + foo.getClass());
|
||||
}
|
||||
|
||||
public interface Sink {
|
||||
+1
-3
@@ -24,8 +24,6 @@ import org.springframework.integration.annotation.Poller;
|
||||
import org.springframework.integration.core.MessageSource;
|
||||
import org.springframework.messaging.Message;
|
||||
import org.springframework.messaging.MessageChannel;
|
||||
import org.springframework.messaging.MessageHeaders;
|
||||
import org.springframework.messaging.support.GenericMessage;
|
||||
import org.springframework.messaging.support.MessageBuilder;
|
||||
|
||||
/**
|
||||
@@ -44,7 +42,7 @@ public class SampleSource {
|
||||
System.out.println("******************");
|
||||
String value = "{\"value\":\"hi\"}";
|
||||
System.out.println("Sending value: " + value);
|
||||
return MessageBuilder.withPayload(value).setHeader(MessageHeaders.CONTENT_TYPE, "application/json").build();
|
||||
return MessageBuilder.withPayload(value).build();
|
||||
}
|
||||
};
|
||||
}
|
||||
+5
-5
@@ -33,13 +33,13 @@ public class SampleTransformer {
|
||||
|
||||
@StreamListener(Processor.INPUT)
|
||||
@SendTo(Processor.OUTPUT)
|
||||
public Bar receive(Bar barMessage) {
|
||||
public Bar receive(Bar bar) {
|
||||
System.out.println("******************");
|
||||
System.out.println("At the transformer");
|
||||
System.out.println("******************");
|
||||
System.out.println("Received value "+ barMessage.getValue() + " of type " + barMessage.getClass());
|
||||
System.out.println("Transforming the value to " + TRANSFORMATION_VALUE + " and with the type " + barMessage.getClass());
|
||||
barMessage.setValue(TRANSFORMATION_VALUE);
|
||||
return barMessage;
|
||||
System.out.println("Received value "+ bar.getValue() + " of type " + bar.getClass());
|
||||
System.out.println("Transforming the value to " + TRANSFORMATION_VALUE + " and with the type " + bar.getClass());
|
||||
bar.setValue(TRANSFORMATION_VALUE);
|
||||
return bar;
|
||||
}
|
||||
}
|
||||
-3
@@ -1,5 +1,3 @@
|
||||
server:
|
||||
port: 8082
|
||||
spring:
|
||||
cloud:
|
||||
stream:
|
||||
@@ -10,6 +8,5 @@ spring:
|
||||
destination: testtock
|
||||
output:
|
||||
destination: xformed
|
||||
content-type: application/json
|
||||
sample-sink:
|
||||
destination: xformed
|
||||
Executable
+2
@@ -0,0 +1,2 @@
|
||||
#!/bin/bash
|
||||
docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -e HOST_IP=$1 -e ZK=$2 -i -t wurstmeister/kafka /bin/bash
|
||||
@@ -1,42 +0,0 @@
|
||||
Spring Cloud Stream Stream Listener Sample
|
||||
=============================
|
||||
|
||||
In this *Spring Cloud Stream* sample, the application shows how to use StreamListener support to enable message mapping and automatic type conversion.
|
||||
|
||||
## Requirements
|
||||
|
||||
To run this sample, you will need to have installed:
|
||||
|
||||
* Java 8 or Above
|
||||
|
||||
This example requires Redis to be running on localhost.
|
||||
|
||||
## Code Tour
|
||||
|
||||
This sample is a Spring Boot application that bundles multiple application together to showcase how to use StreamListener to enable
|
||||
message mapping and automatic type conversion.
|
||||
|
||||
* TypeConversionApplication - the Spring Boot Main Application
|
||||
* Converters - the class that holds the required custom message converter that converts POJO of type `Foo` to `Bar`
|
||||
* SampleSource - the app that generates a message of type `Foo` that has the value `hi`
|
||||
* SampleTransformer - the app that has the message handler method annotated with @StreamListener to map the process input channel to a type `Bar`.
|
||||
This will make sure to apply `FooToBarConverter` automatically without having a need to specify `content-type` for the channel explicitly.
|
||||
The annotation @SendTo on the message handler method will make sure to send the output to the provided output channel.
|
||||
* SampleSink - the app that receives the converted message from the transformer output.
|
||||
|
||||
Please note that the applications (SampleSource, SampleTransformer and SampleSink) are bundled inside the single application for the demo
|
||||
purpose only. In practice, these applications run on their own. If at all they need to be bundled together, the best practice is to use
|
||||
`AggregateApplicationBuilder`. Refer the sample `double` for more info on aggregate application.
|
||||
|
||||
## Building with Maven
|
||||
|
||||
Build the sample by executing:
|
||||
|
||||
>$ mvn clean package
|
||||
|
||||
## Running the Sample
|
||||
|
||||
To start the source module execute the following:
|
||||
|
||||
>$ java -jar target/spring-cloud-stream-sample-stream-listener-1.0.0.BUILD-SNAPSHOT-exec.jar
|
||||
|
||||
Reference in New Issue
Block a user