public class CloudFoundryVcapEnvironmentPostProcessor extends Object implements EnvironmentPostProcessor, org.springframework.core.Ordered, org.springframework.context.ApplicationListener<ApplicationPreparedEvent>
EnvironmentPostProcessor that knows where to find VCAP (a.k.a. Cloud
Foundry) meta data in the existing environment. It parses out the VCAP_APPLICATION and
VCAP_SERVICES meta data and dumps it in a form that is easily consumed by
Environment users. If the app is running in Cloud Foundry then both meta data
items are JSON objects encoded in OS environment variables. VCAP_APPLICATION is a
shallow hash with basic information about the application (name, instance id, instance
index, etc.), and VCAP_SERVICES is a hash of lists where the keys are service labels
and the values are lists of hashes of service instance meta data. Examples are:
VCAP_APPLICATION: {"instance_id":"2ce0ac627a6c8e47e936d829a3a47b5b","instance_index":0,
"version":"0138c4a6-2a73-416b-aca0-572c09f7ca53","name":"foo",
"uris":["foo.cfapps.io"], ...}
VCAP_SERVICES: {"rds-mysql-1.0":[{"name":"mysql","label":"rds-mysql-1.0","plan":"10mb",
"credentials":{"name":"d04fb13d27d964c62b267bbba1cffb9da","hostname":"mysql-service-public.clqg2e2w3ecf.us-east-1.rds.amazonaws.com",
"host":"mysql-service-public.clqg2e2w3ecf.us-east-1.rds.amazonaws.com","port":3306,"user":"urpRuqTf8Cpe6",
"username":"urpRuqTf8Cpe6","password":"pxLsGVpsC9A5S"}
}]}
These objects are flattened into properties. The VCAP_APPLICATION object goes straight
to vcap.application.* in a fairly obvious way, and the VCAP_SERVICES object is
unwrapped so that it is a hash of objects with key equal to the service instance name
(e.g. "mysql" in the example above), and value equal to that instances properties, and
then flattened in the same way. E.g.
vcap.application.instance_id: 2ce0ac627a6c8e47e936d829a3a47b5b vcap.application.version: 0138c4a6-2a73-416b-aca0-572c09f7ca53 vcap.application.name: foo vcap.application.uris[0]: foo.cfapps.io vcap.services.mysql.name: mysql vcap.services.mysql.label: rds-mysql-1.0 vcap.services.mysql.credentials.name: d04fb13d27d964c62b267bbba1cffb9da vcap.services.mysql.credentials.port: 3306 vcap.services.mysql.credentials.host: mysql-service-public.clqg2e2w3ecf.us-east-1.rds.amazonaws.com vcap.services.mysql.credentials.username: urpRuqTf8Cpe6 vcap.services.mysql.credentials.password: pxLsGVpsC9A5S ...N.B. this initializer is mainly intended for informational use (the application and instance ids are particularly useful). For service binding you might find that Spring Cloud is more convenient and more robust against potential changes in Cloud Foundry.
| Constructor and Description |
|---|
CloudFoundryVcapEnvironmentPostProcessor() |
| Modifier and Type | Method and Description |
|---|---|
int |
getOrder() |
void |
onApplicationEvent(ApplicationPreparedEvent event) |
void |
postProcessEnvironment(org.springframework.core.env.ConfigurableEnvironment environment,
SpringApplication application)
Post-process the given
environment. |
void |
setOrder(int order) |
public CloudFoundryVcapEnvironmentPostProcessor()
public void setOrder(int order)
public int getOrder()
getOrder in interface org.springframework.core.Orderedpublic void postProcessEnvironment(org.springframework.core.env.ConfigurableEnvironment environment,
SpringApplication application)
EnvironmentPostProcessorenvironment.postProcessEnvironment in interface EnvironmentPostProcessorenvironment - the environment to post-processapplication - the application to which the environment belongspublic void onApplicationEvent(ApplicationPreparedEvent event)
onApplicationEvent in interface org.springframework.context.ApplicationListener<ApplicationPreparedEvent>Copyright © 2020 Pivotal Software, Inc.. All rights reserved.