Adding KStream sample applications
Add sample for the canonical WordCount Showing how to track group of products Showing how to implement interactive queries Fix #41 Update scst versions Enhance kstream samples
This commit is contained in:
Soby Chacko
committed by
Ilayaperumal Gopinathan
Ilayaperumal Gopinathan
parent
30a0c1d734
commit
a2fea3a188
0
kstream/kstream-interactive-query/.jdk8
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kstream/kstream-interactive-query/.jdk8
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BIN
kstream/kstream-interactive-query/.mvn/wrapper/maven-wrapper.jar
vendored
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kstream/kstream-interactive-query/.mvn/wrapper/maven-wrapper.jar
vendored
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kstream/kstream-interactive-query/.mvn/wrapper/maven-wrapper.properties
vendored
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kstream/kstream-interactive-query/.mvn/wrapper/maven-wrapper.properties
vendored
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distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.5.0/apache-maven-3.5.0-bin.zip
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46
kstream/kstream-interactive-query/README.adoc
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kstream/kstream-interactive-query/README.adoc
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== What is this app?
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This is an example of a Spring Cloud Stream processor using Kafka Streams support.
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The example is based on a contrived use case of tracking products by interactively querying their status.
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The program accepts product ID's and track their counts hitherto by interactively querying the underlying store. \
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This sample uses lambda expressions and thus requires Java 8+.
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==== Starting Kafka in a docker container
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* Skip steps 1-3 if you already have a non-Docker Kafka environment.
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1. Go to the docker directory in this repo and invoke the command `docker-compose up -d`.
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2. Ensure that in the docker directory and then invoke the script `start-kafka-shell.sh`
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3. cd $KAFKA_HOME
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4. Start the console producer: +
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Assuming that you are running kafka on a docker container on mac osx. Change the zookeeper IP address accordingly otherwise. +
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`bin/kafka-console-producer.sh --broker-list 192.168.99.100:9092 --topic products`
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=== Running the app:
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Go to the root of the repository and do:
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`./mvnw clean package`
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`java -jar target/kstream-interactive-query-0.0.1-SNAPSHOT.jar --kstream.product.tracker.productIds=123,124,125`
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The above command will track products with ID's 123,124 and 125 and print their counts seen so far every 30 seconds.
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* By default we use the docker container IP (mac osx specific) in the `application.yml` for Kafka broker and zookeeper.
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Change it in `application.yml` (which requires a rebuild) or pass them as runtime arguments as below.
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`spring.cloud.stream.kstream.binder.brokers=<Broker IP Address>` +
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`spring.cloud.stream.kstream.binder.zkNodes=<Zookeeper IP Address>`
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Enter the following in the console producer (one line at a time) and watch the output on the console (or IDE) where the application is running.
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```
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{"id":"123"}
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{"id":"124"}
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{"id":"125"}
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{"id":"123"}
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{"id":"123"}
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{"id":"123"}
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```
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14
kstream/kstream-interactive-query/docker/docker-compose.yml
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14
kstream/kstream-interactive-query/docker/docker-compose.yml
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version: '2'
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services:
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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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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: 192.168.99.100
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KAFKA_ADVERTISED_PORT: 9092
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KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
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2
kstream/kstream-interactive-query/docker/start-kafka-shell.sh
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kstream/kstream-interactive-query/docker/start-kafka-shell.sh
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#!/bin/bash
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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
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225
kstream/kstream-interactive-query/mvnw
vendored
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kstream/kstream-interactive-query/mvnw
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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
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. 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,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
|
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# specific language governing permissions and limitations
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# 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
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# 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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if [ -f "$HOME/.mavenrc" ] ; then
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. "$HOME/.mavenrc"
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fi
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fi
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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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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"`/$link"
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fi
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done
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saveddir=`pwd`
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M2_HOME=`dirname "$PRG"`/..
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# make it fully qualified
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M2_HOME=`cd "$M2_HOME" && pwd`
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cd "$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 "$M2_HOME"`
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[ -n "$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"`
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fi
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# For Migwn, ensure paths are in UNIX format before anything is touched
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if $mingw ; then
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[ -n "$M2_HOME" ] &&
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M2_HOME="`(cd "$M2_HOME"; pwd)`"
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[ -n "$JAVA_HOME" ] &&
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JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
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# TODO classpath?
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fi
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if [ -z "$JAVA_HOME" ]; then
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javaExecutable="`which javac`"
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if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
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# readlink(1) is not available as standard on Solaris 10.
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readLink=`which readlink`
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if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
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if $darwin ; then
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javaHome="`dirname \"$javaExecutable\"`"
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javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
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else
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javaExecutable="`readlink -f \"$javaExecutable\"`"
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fi
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javaHome="`dirname \"$javaExecutable\"`"
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javaHome=`expr "$javaHome" : '\(.*\)/bin'`
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JAVA_HOME="$javaHome"
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export JAVA_HOME
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fi
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fi
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fi
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if [ -z "$JAVACMD" ] ; then
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if [ -n "$JAVA_HOME" ] ; then
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if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
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# IBM's JDK on AIX uses strange locations for the executables
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JAVACMD="$JAVA_HOME/jre/sh/java"
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else
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JAVACMD="$JAVA_HOME/bin/java"
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fi
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else
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JAVACMD="`which java`"
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fi
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fi
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if [ ! -x "$JAVACMD" ] ; then
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echo "Error: JAVA_HOME is not defined correctly." >&2
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echo " We cannot execute $JAVACMD" >&2
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exit 1
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fi
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if [ -z "$JAVA_HOME" ] ; then
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echo "Warning: JAVA_HOME environment variable is not set."
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fi
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CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
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# traverses directory structure from process work directory to filesystem root
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# first directory with .mvn subdirectory is considered project base directory
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find_maven_basedir() {
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if [ -z "$1" ]
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then
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echo "Path not specified to find_maven_basedir"
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return 1
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||||
fi
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basedir="$1"
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wdir="$1"
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while [ "$wdir" != '/' ] ; do
|
||||
if [ -d "$wdir"/.mvn ] ; then
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basedir=$wdir
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break
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||||
fi
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||||
# workaround for JBEAP-8937 (on Solaris 10/Sparc)
|
||||
if [ -d "${wdir}" ]; then
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wdir=`cd "$wdir/.."; pwd`
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||||
fi
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||||
# end of workaround
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||||
done
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echo "${basedir}"
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||||
}
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||||
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||||
# concatenates all lines of a file
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||||
concat_lines() {
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||||
if [ -f "$1" ]; then
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||||
echo "$(tr -s '\n' ' ' < "$1")"
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||||
fi
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||||
}
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||||
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||||
BASE_DIR=`find_maven_basedir "$(pwd)"`
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||||
if [ -z "$BASE_DIR" ]; then
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||||
exit 1;
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||||
fi
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||||
|
||||
export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
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||||
echo $MAVEN_PROJECTBASEDIR
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||||
MAVEN_OPTS="$(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 "$MAVEN_PROJECTBASEDIR"`
|
||||
fi
|
||||
|
||||
WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
|
||||
|
||||
exec "$JAVACMD" \
|
||||
$MAVEN_OPTS \
|
||||
-classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
|
||||
"-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
|
||||
${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
|
||||
53
kstream/kstream-interactive-query/pom.xml
Normal file
53
kstream/kstream-interactive-query/pom.xml
Normal file
@@ -0,0 +1,53 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<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">
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
<groupId>kstream.product.tracker</groupId>
|
||||
<artifactId>kstream-interactive-query</artifactId>
|
||||
<version>0.0.1-SNAPSHOT</version>
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||||
<packaging>jar</packaging>
|
||||
|
||||
<name>kstream-interactive-query</name>
|
||||
<description>Spring Cloud Stream sample for KStream interactive queries</description>
|
||||
|
||||
<parent>
|
||||
<groupId>org.springframework.cloud</groupId>
|
||||
<artifactId>spring-cloud-stream-sample-kstream-parent</artifactId>
|
||||
<version>1.2.0.BUILD-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<properties>
|
||||
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
|
||||
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
|
||||
<java.version>1.8</java.version>
|
||||
</properties>
|
||||
|
||||
<dependencies>
|
||||
<dependency>
|
||||
<groupId>org.springframework.cloud</groupId>
|
||||
<artifactId>spring-cloud-stream-binder-kstream</artifactId>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
|
||||
<build>
|
||||
<plugins>
|
||||
<plugin>
|
||||
<groupId>org.springframework.boot</groupId>
|
||||
<artifactId>spring-boot-maven-plugin</artifactId>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
|
||||
<repositories>
|
||||
<repository>
|
||||
<id>spring-milestones</id>
|
||||
<name>Spring Milestones</name>
|
||||
<url>http://repo.spring.io/libs-milestone-local</url>
|
||||
<snapshots>
|
||||
<enabled>false</enabled>
|
||||
</snapshots>
|
||||
</repository>
|
||||
</repositories>
|
||||
|
||||
</project>
|
||||
@@ -0,0 +1,127 @@
|
||||
/*
|
||||
* Copyright 2017 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
|
||||
*
|
||||
* http://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 kstream.word.count.kstreamwordcount;
|
||||
|
||||
import java.util.Set;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
import org.apache.kafka.common.serialization.Serdes;
|
||||
import org.apache.kafka.streams.KafkaStreams;
|
||||
import org.apache.kafka.streams.KeyValue;
|
||||
import org.apache.kafka.streams.kstream.KStream;
|
||||
import org.apache.kafka.streams.state.QueryableStoreTypes;
|
||||
import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
|
||||
|
||||
import org.springframework.beans.factory.annotation.Autowired;
|
||||
import org.springframework.boot.SpringApplication;
|
||||
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
|
||||
import org.springframework.boot.autoconfigure.SpringBootApplication;
|
||||
import org.springframework.boot.context.properties.ConfigurationProperties;
|
||||
import org.springframework.boot.context.properties.EnableConfigurationProperties;
|
||||
import org.springframework.cloud.stream.annotation.EnableBinding;
|
||||
import org.springframework.cloud.stream.annotation.StreamListener;
|
||||
import org.springframework.cloud.stream.binder.kstream.annotations.KStreamProcessor;
|
||||
import org.springframework.kafka.core.KStreamBuilderFactoryBean;
|
||||
import org.springframework.kafka.support.serializer.JsonSerde;
|
||||
import org.springframework.messaging.handler.annotation.SendTo;
|
||||
import org.springframework.scheduling.annotation.EnableScheduling;
|
||||
import org.springframework.scheduling.annotation.Scheduled;
|
||||
import org.springframework.util.StringUtils;
|
||||
|
||||
@SpringBootApplication
|
||||
public class KStreamInteractiveQueryApplication {
|
||||
|
||||
public static void main(String[] args) {
|
||||
SpringApplication.run(KStreamInteractiveQueryApplication.class, args);
|
||||
}
|
||||
|
||||
@EnableBinding(KStreamProcessor.class)
|
||||
@EnableAutoConfiguration
|
||||
@EnableConfigurationProperties(ProductTrackerProperties.class)
|
||||
@EnableScheduling
|
||||
public static class InteractiveProductCountApplication {
|
||||
|
||||
private static final String STORE_NAME = "prod-id-count-store";
|
||||
|
||||
@Autowired
|
||||
private KStreamBuilderFactoryBean kStreamBuilderFactoryBean;
|
||||
|
||||
@Autowired
|
||||
ProductTrackerProperties productTrackerProperties;
|
||||
|
||||
ReadOnlyKeyValueStore<Object, Object> keyValueStore;
|
||||
|
||||
@StreamListener("input")
|
||||
@SendTo("output")
|
||||
public KStream<Integer, Long> process(KStream<Object, Product> input) {
|
||||
|
||||
return input
|
||||
.filter((key, product) -> productIds().contains(product.getId()))
|
||||
.map((key, value) -> new KeyValue<>(value.id, value))
|
||||
.groupByKey(new Serdes.IntegerSerde(), new JsonSerde<>(Product.class))
|
||||
.count(STORE_NAME)
|
||||
.toStream();
|
||||
}
|
||||
|
||||
private Set<Integer> productIds() {
|
||||
return StringUtils.commaDelimitedListToSet(productTrackerProperties.getProductIds())
|
||||
.stream().map(Integer::parseInt).collect(Collectors.toSet());
|
||||
}
|
||||
|
||||
|
||||
@Scheduled(fixedRate = 30000, initialDelay = 5000)
|
||||
public void printProductCounts() {
|
||||
if (keyValueStore == null) {
|
||||
KafkaStreams streams = kStreamBuilderFactoryBean.getKafkaStreams();
|
||||
keyValueStore = streams.store(STORE_NAME, QueryableStoreTypes.keyValueStore());
|
||||
}
|
||||
|
||||
for (Integer id : productIds()) {
|
||||
System.out.println("Product ID: " + id + " Count: " + keyValueStore.get(id));
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@ConfigurationProperties(prefix = "kstream.product.tracker")
|
||||
static class ProductTrackerProperties {
|
||||
|
||||
private String productIds;
|
||||
|
||||
public String getProductIds() {
|
||||
return productIds;
|
||||
}
|
||||
|
||||
public void setProductIds(String productIds) {
|
||||
this.productIds = productIds;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
static class Product {
|
||||
|
||||
Integer id;
|
||||
|
||||
public Integer getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(Integer id) {
|
||||
this.id = id;
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,21 @@
|
||||
spring.cloud.stream.bindings.output.contentType: application/json
|
||||
spring.cloud.stream.kstream.binder.configuration.commit.interval.ms: 1000
|
||||
spring.cloud.stream.kstream:
|
||||
binder.configuration:
|
||||
key.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
|
||||
value.serde: org.apache.kafka.common.serialization.Serdes$StringSerde
|
||||
bindings.output.producer:
|
||||
keySerde: org.apache.kafka.common.serialization.Serdes$IntegerSerde
|
||||
valueSerde: org.apache.kafka.common.serialization.Serdes$StringSerde
|
||||
spring.cloud.stream.bindings.output:
|
||||
destination: product-counts
|
||||
producer:
|
||||
headerMode: raw
|
||||
useNativeEncoding: true
|
||||
spring.cloud.stream.bindings.input:
|
||||
destination: products
|
||||
consumer:
|
||||
headerMode: raw
|
||||
spring.cloud.stream.kstream.binder:
|
||||
brokers: 192.168.99.100
|
||||
zkNodes: 192.168.99.100
|
||||
@@ -0,0 +1,12 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<configuration>
|
||||
<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
|
||||
<encoder>
|
||||
<pattern>%d{ISO8601} %5p %t %c{2}:%L - %m%n</pattern>
|
||||
</encoder>
|
||||
</appender>
|
||||
<root level="INFO">
|
||||
<appender-ref ref="stdout"/>
|
||||
</root>
|
||||
<logger name="org.apache.kafka.streams.processor.internals" level="WARN"/>
|
||||
</configuration>
|
||||
Reference in New Issue
Block a user