如何在Jmeter beanshell处理器中生成timeuuid？

Question

I would like to know a way to dynamically generate timeUUID via pre-processor or post-processor beanshell in Jmeter for dynamic load testing to better fit real life scenario. I have tried to add datastax cassandra driver in /lib folder, but it seems to complain about missing com.google.common.base.charsets dependencies. It is probably not a standalone cassandra driver. Any suggestion for a library that can generate timeUUID would be appreciated.

Answer 1

Looking into Maven Central Cassandra JDBC Driver has some dependencies which you need to have in JMeter's CLASSPATH as well.

Example steps (assume Apache Maven )

1. Create an arbitrary folder somewhere

2. Create pom.xml file in that folder with the following contents:

    <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>gd.wa</groupId> <artifactId>minimal-pom</artifactId> <version>1.0-SNAPSHOT</version> <packaging>jar</packaging> <name>minimal-pom</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.7</java.version> </properties> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>${java.version}</source> <target>${java.version}</target> </configuration> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>com.datastax.cassandra</groupId> <artifactId>cassandra-driver-core</artifactId> <version>2.1.10.1</version> </dependency> </dependencies> </project> 

3. Replace 2.1.10. with the version of your Cassandra server

4. In the folder created in step 1 execute the following command:

    mvn dependency:copy-dependencies 

5. Copy all the .jar files from target/dependency folder to JMeter's CLASSPATH (ie to "lib" folder of your JMeter installation). My list looks like:

    asm-5.0.3.jar asm-analysis-5.0.3.jar asm-commons-5.0.3.jar asm-tree-5.0.3.jar asm-util-5.0.3.jar cassandra-driver-core-2.1.10.1.jar guava-14.0.1.jar jffi-1.2.10-native.jar jffi-1.2.10.jar jnr-constants-0.9.0.jar jnr-ffi-2.0.7.jar jnr-posix-3.0.27.jar jnr-x86asm-1.0.2.jar metrics-core-3.0.2.jar netty-buffer-4.0.33.Final.jar netty-codec-4.0.33.Final.jar netty-common-4.0.33.Final.jar netty-handler-4.0.33.Final.jar netty-transport-4.0.33.Final.jar slf4j-api-1.7.5.jar 

6. Restart JMeter to pick the jars up

7. In Beanshell Test Elements use the following code:

    import com.datastax.driver.core.utils.UUIDs; UUID timeUUID = UUIDs.timeBased(); String timeUUIDString = timeUUID.toString(); vars.put("timeUUID", timeUUIDString); //etc. 

See How to Use BeanShell: JMeter's Favorite Built-in Component for more information on using Beanshell in JMeter.

Answer 2

You'd probably need to put also the guava jar file into /lib

Look at the source code of UUIDS class, it is importing com.google.common.base.charsets