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7.0 KiB
7.0 KiB
Mocking Services in Camel
Goals
In this example, we will mock the an API (api.github.com). This is very useful if the API is billed per usage or not available.
The mocked service
We will mock the following API calls (you can try them in a terminal):
curl -D - https://api.github.com/
curl -D - https://api.github.com/users/nmasse-itix
curl -D - https://api.github.com/users/lbroudoux
curl -D - https://api.github.com/users/xxx-dummy-missing-xxx
curl -D - https://api.github.com/orgs/microcks
curl -D - https://api.github.com/orgs/xxx-dummy-missing-xxx
How this project has been created
Generate a new Maven project using the camel-archetype-java archetype:
mvn archetype:generate -DarchetypeGroupId=org.apache.camel.archetypes -DarchetypeArtifactId=camel-archetype-spring -DarchetypeVersion=2.21.1 -DinteractiveMode=false -DgroupId=fr.itix.camel-examples -DartifactId=mocking -Dversion=1.0-SNAPSHOT -Dpackage=fr.itix.camel.mocking
As usual, enter the created directory and remove the provided examples:
cd mocking
rm -rf src/data
You should have such repository structure:
$ find . -type f
pom.xml
src/main/resources/META-INF/spring/camel-context.xml
src/main/resources/log4j2.properties
Since we will use the jetty Camel component to listen for HTTP requests,
according to the documentation, you will
have to add the specified dependency to your pom.xml. In the <dependencies>
section, add:
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jetty</artifactId>
</dependency>
Replace the content of camel-context.xml with this file.
How to test it
Each time you changed something in your camel-context.xml, you will have
to re-run Camel with:
mvn install camel:run
If you followed the instructions, you should have something like this:
[INFO] --- camel-maven-plugin:2.21.1:run (default-cli) @ mocking ---
[INFO] You can skip tests from the command line using: mvn camel:run -Dmaven.test.skip=true
[INFO] Using org.apache.camel.spring.Main to initiate a CamelContext
[INFO] Starting Camel ...
Jun 05, 2018 11:08:24 AM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@2311c071: startup date [Tue Jun 05 11:08:24 CEST 2018]; root of context hierarchy
Jun 05, 2018 11:08:24 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from file [/Users/nmasse/git/perso/Camel-Examples/mocking/target/classes/META-INF/spring/camel-context.xml]
[pache.camel.spring.Main.main()] SpringCamelContext INFO Apache Camel 2.21.1 (CamelContext: camel-1) is starting
[pache.camel.spring.Main.main()] ManagedManagementStrategy INFO JMX is enabled
[pache.camel.spring.Main.main()] DefaultTypeConverter INFO Type converters loaded (core: 194, classpath: 8)
[pache.camel.spring.Main.main()] SpringCamelContext INFO StreamCaching is not in use. If using streams then its recommended to enable stream caching. See more details at http://camel.apache.org/stream-caching.html
[pache.camel.spring.Main.main()] log INFO Logging initialized @4192ms to org.eclipse.jetty.util.log.Slf4jLog
[pache.camel.spring.Main.main()] Server INFO jetty-9.4.6.v20170531
[pache.camel.spring.Main.main()] ContextHandler INFO Started o.e.j.s.ServletContextHandler@24af2e09{/,null,AVAILABLE}
[pache.camel.spring.Main.main()] AbstractConnector INFO Started ServerConnector@3ac5035f{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
[pache.camel.spring.Main.main()] Server INFO Started @4290ms
[pache.camel.spring.Main.main()] SpringCamelContext INFO Route: route1 started and consuming from: jetty:http://0.0.0.0:8080?matchOnUriPrefix=true
[pache.camel.spring.Main.main()] SpringCamelContext INFO Route: route2 started and consuming from: direct://get_orgs_microcks
[pache.camel.spring.Main.main()] SpringCamelContext INFO Route: route3 started and consuming from: direct://get_users_nmasse_itix
[pache.camel.spring.Main.main()] SpringCamelContext INFO Route: route4 started and consuming from: direct://get_users_lbroudoux
[pache.camel.spring.Main.main()] SpringCamelContext INFO Route: route5 started and consuming from: direct://not_found
[pache.camel.spring.Main.main()] SpringCamelContext INFO Route: route6 started and consuming from: direct://get_metadata
[pache.camel.spring.Main.main()] SpringCamelContext INFO Total 6 routes, of which 6 are started
[pache.camel.spring.Main.main()] SpringCamelContext INFO Apache Camel 2.21.1 (CamelContext: camel-1) started in 0.397 seconds
Jun 05, 2018 11:08:25 AM org.springframework.context.support.DefaultLifecycleProcessor start
INFO: Starting beans in phase 2147483646
From another terminal you can verify that the mock is working and matches the mocked API:
$ curl -D - http://localhost:8080/
HTTP/1.1 200 OK
Content-Type: application/json
Accept: */*
breadcrumbId: ID-nmasse-OSX-local-1528189705427-0-9
User-Agent: curl/7.54.0
Transfer-Encoding: chunked
Server: Jetty(9.4.6.v20170531)
{
"organization_url": "https://api.github.com/orgs/{org}",
"user_url": "https://api.github.com/users/{user}"
}
You can try with the other URLs:
curl -D - http://localhost:8080/users/nmasse-itix
curl -D - http://localhost:8080/users/lbroudoux
curl -D - http://localhost:8080/users/xxx-dummy-missing-xxx
curl -D - http://localhost:8080/orgs/microcks
curl -D - http://localhost:8080/orgs/xxx-dummy-missing-xxx
On the other console, you should see the requests coming in the log:
[ qtp183376222-18] route1 INFO GET /
[ qtp183376222-19] route1 INFO GET /users/nmasse-itix
[ qtp183376222-20] route1 INFO GET /users/lbroudoux
[ qtp183376222-21] route1 INFO GET /users/xxx-dummy-missing-xxx
[ qtp183376222-22] route1 INFO GET /orgs/microcks
[ qtp183376222-23] route1 INFO GET /orgs/xxx-dummy-missing-xxx
Note: you will have to press Ctrl-C to exit this example!