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Using the CarbonContext API

The usage of the CarbonContext API for development in a WSO2 product is explained below. For the full list of capabilities available in this kernel version, see the features section in the root README.md file.

The CarbonContext API is used for the purpose of storing and retrieving data that is thread local. This API implements the two classes named CarbonContext and PrivilegedCarbonContext.

CarbonContext

This is the ReadOnly API, which is basically the user-level API. Shown below is a sample use case of the CarbonContext API.

CarbonContext carbonContext = CarbonContext.getCurrentContext();
String tenant = carbonContext.getTenant();
Principal principal = carbonContext.getUserPrincipal();
Object propertyValue = carbonContext.getProperty("PROPERTY_KEY");

As shown above, the CarbonContext class is used to get the following information:

  • The name of the tenant dedicated for the server.

    Retrieving tenant information: Note that from Carbon 5 onwards, a server is dedicated to one tenant. Therefore, we do not have a separate API for setting the tenant name. The tenant name will be taken from the carbon.yml file or it can be set as a system/environment variable.

  • The User Principal value, which is the JAAS principal for authorization that is applicable to the currently logged in user.

  • The properties that help you set values that can be used later in the thread flow.

PrivilegedCarbonContext

This is the ReadWrite API, which is secured using java security permission. This is the final class extending from the CarbonContext API. Shown below is a sample use case of the PrivilegedCarbonContext API.

PrivilegedCarbonContext privilegedCarbonContext = PrivilegedCarbonContext.getCurrentContext();
privilegedCarbonContext.setUserPrincipal(userPrincipal);
privilegedCarbonContext.setProperty("PROPERTY_KEY", propertyValue);

As shown above, the PrivilegedCarbonContext class is used to set the following information:

  • The User Principal value.
  • Property values.