GZIP Compress is used to compress a byte array and GZIP Uncompress is used to uncompress a byte array.

There is often a requirement that we need to compress or uncompress a message payload at the end of operations. MuleSoft provides out-of-box GZIP Compress and Uncompress to achieve this.

Now, we will walk through the GZIP Compress and Uncompress transformers.

Compress Message Payload Using GZIP

Place the file connector into the message source in the flow and configure it.

Now, you need to convert the message into a byte array. So, place the String to Byte Array transformer in the message processor region after the inbound file connector.

Place the GZIP Compress transformer after the String to Byte Array transformer.

Finally, place the outbound file connector at the end of message processor. It will be used to store the compressed file.

Testing Application

Drop the plain file to the folder location that you have specified in inbound file connector. The outbound compress file can be seen at the folder location that you specified for outbound file connector.

Input message (1053 bytes):

<Employees>
	<Employee>
		<FirstName>Jitu</FirstName>
		<LastName>Jain</LastName>
		<Salary>100000</Salary>
	</Employee>
	<Employee>
		<FirstName>Jospeh</FirstName>
		<LastName>Adams</LastName>
		<Salary>200000</Salary>
	</Employee>
	<Employee>
		<FirstName>Steve</FirstName>
		<LastName>Simon</LastName>
		<Salary>300000</Salary>
	</Employee>
	<Employee>
		<FirstName>Brain</FirstName>
		<LastName>Handscomb</LastName>
		<Salary>300000</Salary>
	</Employee>
	<Employee>
		<FirstName>Rajeev</FirstName>
		<LastName>Thandani</LastName>
		<Salary>500000</Salary>
	</Employee>
	<Employee>
		<FirstName>Jitu</FirstName>
		<LastName>Jain</LastName>
		<Salary>100000</Salary>
	</Employee>
	<Employee>
		<FirstName>Jospeh</FirstName>
		<LastName>Adams</LastName>
		<Salary>200000</Salary>
	</Employee>
	<Employee>
		<FirstName>Steve</FirstName>
		<LastName>Simon</LastName>
		<Salary>300000</Salary>
	</Employee>
	<Employee>
		<FirstName>Brain</FirstName>
		<LastName>Handscomb</LastName>
		<Salary>300000</Salary>
	</Employee>
</Employees>

Output message (177 bytes):

The GZIP Compress transformer reduces the size of the original file by almost 5 times!

Code:

<Employees>
	<Employee>
		<FirstName>Jitu</FirstName>
		<LastName>Jain</LastName>
		<Salary>100000</Salary>
	</Employee>
	<Employee>
		<FirstName>Jospeh</FirstName>
		<LastName>Adams</LastName>
		<Salary>200000</Salary>
	</Employee>
	<Employee>
		<FirstName>Steve</FirstName>
		<LastName>Simon</LastName>
		<Salary>300000</Salary>
	</Employee>
	<Employee>
		<FirstName>Brain</FirstName>
		<LastName>Handscomb</LastName>
		<Salary>300000</Salary>
	</Employee>
	<Employee>
		<FirstName>Rajeev</FirstName>
		<LastName>Thandani</LastName>
		<Salary>500000</Salary>
	</Employee>
	<Employee>
		<FirstName>Jitu</FirstName>
		<LastName>Jain</LastName>
		<Salary>100000</Salary>
	</Employee>
	<Employee>
		<FirstName>Jospeh</FirstName>
		<LastName>Adams</LastName>
		<Salary>200000</Salary>
	</Employee>
	<Employee>
		<FirstName>Steve</FirstName>
		<LastName>Simon</LastName>
		<Salary>300000</Salary>
	</Employee>
	<Employee>
		<FirstName>Brain</FirstName>
		<LastName>Handscomb</LastName>
		<Salary>300000</Salary>
	</Employee>
</Employees>

Uncompress Message Payload Using GZIP

For uncompressing the payload, you need to use GZIP Uncompress. The information for the display names, etc. is all the same.

Testing Application

Drop the compressed file to the folder location that you have specified in the inbound file connector. The outbound uncompress file can be seen at the folder location that you specified for outbound file connector.

Output:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<mule
	xmlns:file="http://www.mulesoft.org/schema/mule/file"
	xmlns:http="http://www.mulesoft.org/schema/mule/http"
	xmlns="http://www.mulesoft.org/schema/mule/core"
	xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
	xmlns:spring="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd">
	<http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8081" doc:name="HTTP Listener Configuration"/>
	<flow name="compressprojFlow">
		<file:inbound-endpoint path="src/test/resources/compress" responseTimeout="10000" doc:name="File"/>
		<file:file-to-byte-array-transformer doc:name="File to Byte Array"/>
		<gzip-uncompress-transformer doc:name="Gzip Uncompress"/>
		<file:outbound-endpoint path="src/test/resources/uncompress" responseTimeout="10000" doc:name="File"/>
	</flow>
</mule>

Now, you know how to compress and uncompress the message payloads using GZIP with MuleSoft!