Jmeter.Plugin.TailSampler

Sampler, performing parallel loading of specified resources.

Plugin makes it easy to load embedded resources, making the test as close as possible to the browser operation. HTTP Request Tail converts the list of links into an HTML document, GET request for each of these links, downloads embedded resources

Link to download.

This version of the plugin designed to work with JMeter 3.0, JMeter 2.13. Not tested on earlier versions.

Installation

Download the plugin (see links above) ru.pflb.jmeter.samplers.TailSampler.jar.
Copy the plugin to lib/ext directory JMeter 3.0.
Restart JMeter 3.0.

Example directory:

D:\TOOLS\apache-jmeter-3.0\lib\ext\
D:\TOOLS\apache-jmeter-3.0\lib\ext\ru.pflb.jmeter.samplers.TailSampler.jar

Description

Default settings:

[v] Retrieve All Embedded Resources - the checkbox is set by default, it can be removed, but then subrequests will not be executed, and the HTTP Request Tail will become useless.
[v] Use concurrent pool - the checkbox is set by default, on a large number of embedded resources, multi-threaded download increases the download speed.
Use concurrent pool Size: 4 - the default value is 4, the value is used as the JMeter base value.
- HttpClient4 when configuring Use concurrent pool Size: 4 will send up to 4 requests parallel, each thread will use 1 persistent connection per domain:
  - Run a thread group, the size of the group determined by the Use concurrent pool Size settings; - When configuring [v] **Use keepalive** each thread for each unique domain will create one persistent connection;
- By default, Firefox 44.0 browser sends up to 6 requests at the same time for each domain (see about:config):
  - 256 - network.http.max-connections - The maximum number of connections;
  - 6 - network.http.max-persistent-connections-per-server - The maximum number of persistent connections to the server;
  - 32 - network.http.max-persistent-connections-per-proxy - The maximum number of persistent connections to the proxy server;
- If you focus on Firefox settings and the fact that LT resources usually belong to the same domain, then in {v} you can set value to 6 instead of the standard value 4.

Unused settings - settings for the POST-request, the values are not used in any way by either main request or subrequests:

Use multipart/form-data for POST;
Browser-compatible headers.

The main request is generated, not sent, the configuration for the POST request does not apply to it. Subrequests use the method GET, the POST request setting is also not valid for them.

The rest of the settings are valid for subrequests.

Addresses for embedded resources are specified in the text box Embedded resources. You con specify relative and absolute addresses. Relative addresses are supplemented by field values:

Web Server - Host and port:
- Server Name or IP;
- Port Number;
Path - Catalogue for those links that are relative to the page, not to the host.

The response to the main request is generated. There is no request, there is only the body of the response. The response body is an HTML document, text with UTF-8 encoding, where the tag iframe is generated for each reference to the embedded resource.

Example of a document:

	<!DOCTYPE HTML>
	<html>
	<head>
	  <meta charset="utf-8">
		<title>Embedded resources</title>
	  </head>
	  <body>
		<iframe src="http://www.google-analytics.com/analytics.js"></iframe>
		<iframe src="https://github.com/sites/all/themes/pro/static/img/icons.png"></iframe>
		<iframe src="sites/all/themes/pro/static/img/main_3_block90-s.png"></iframe>
		<iframe src="http://www.performance-lab.ru/sites/all/themes/pro/static/img/footer-shadow.png"></iframe>
		<iframe src="http://staticxx.facebook.com/connect/xd_arbiter.php"></iframe>
	  </body>
	</html>

Temporary configurations

If you uncheck the Retrieve All Embedded Resources checkbox or do not specify a single link in Embedded resources, the log will say that the request sent instantly, and the response to it came instantly

Description of temporary configuration:

Load Time reflects the duration of loading embedded resources;
Connect time always 0;
Latency always 0.

Project structure

Source code in the catalogue:

/src/ru/pflb/jmeter:

protocol/http/config/gui:
- TailUrlConfigGui.java - Control with a large input field for links to embedded resources;
samplers:
- wrapper - Wrappers:
  - WrapperHTTPFileImpl.java - To use protocol handler file:// for subrequests;
  - WrapperHTTPHC3Impl.java - To use HttpClient3.1 from settings Implementation for subrequests;
  - WrapperHTTPHC4Impl.java - To use HttpClient4 from settings Implementation for subrequests;
  - WrapperHTTPJavaImpl.java - To use Java from settings Implementation for subrequests;
  - WrapperHTTPSamplerFactory.java - Factory, to create wrappers, returns the handler by protocol values and settings Implementation;
- EscapeUtils.java - HTML shielding implementation, allows you to work with Russian domains, unicode and special characters in links;
- ITailHTTPImpl.java - Basic interface for all handlers;
- TailHTTPHC4Impl.java - Modified HttpClient4, which may not send a request and immediately use the specified response body;
- TailHTTPSamplerProxy.java - The proxy class, which implements all the logic of TailSampler, takes a list of links from the settings and sends them to TailHTTPHC4Impl for the first request and to standard handlers for requests for embedded resources;
- TailHttpSamplerGui.java - Visual representation TailSampler.

Other auxiliary catalogues serve to debug the project.

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pflb / Jmeter.Plugin.TailSampler

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Jmeter.Plugin.TailSampler

Installation

Description

Temporary configurations

Project structure