Jmeter-GCP-PubSub-Sampler

Introduction

This plugin adds feature to connect to GCP to publish/subscribe messages to the topic

Download the source code from the Gitlab.
Just do a mvn clean install (Git bash is required)
Jar will be generated under the target directory (jmeter-pubsub-sampler-1.1.jar).
Copy the Jar to <Jmeter Installed Directory>/lib/ext/ for DI Jmeter <Jmeter Installed Directory>/di/plugins

Add required config element (Publisher config/ Subscriber config)

Provide the required credentials information in the Publisher config/ Subscriber config for the project
To publish message, Add Publisher sampler to TG and then pass the message to publish
To receive message, Add Subscriber sampler to TG to read the mesasges

Apart from config element, Publisher sampler has Gzip compression feature

The Flag in the sampler will allow the mechanism to publish the message with/without Gzip compression
On successful publish of each message, GCP returns a unique Id which will be returned in response header.
Supports attributes for messages being published
Supports multiple topic publishing feature in the same test plan

The subscriber works perfectly. The current mechanism of Subscriber is

The config elements creats a local queue to store the messages received from the GCP.
Currently the Queue size is hardcoded to 100K
The Subscriber sampler is bound to read it form the queue, which is already subscribed by the Message receiver(which is a separate client library's thread)
The subscriber sampler is reading and removing the message from the queue. In future, will change the ack to be done by the sampler.
When the susbcriber sampler is triggered and If there is no messages in the queue, It will wait until a new message arrive to process it.
each message retrieved from the subscriber will have the message ID and publish time info along with the message.
The message ID and publish time info will be returned in response headers and message on response body
The subscriber sampler supports De-Compression, If the message is in gzip compressed format.
Supports multiple topic subscription feature in the same test plan

Below are the references which guided to build this plugin.

If this project help you reduce time to develop, you can give me a cup of coffee :)

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