Session API

Since: 0.2.0
Context: Any

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Description

Session API provides methods for interacting with current session. One of the main usages of this API is a a key-value storage mechanism for the extension store parameters, calculated values or other information in runtime in memory to pass along the another extension or access it later on during the same session.

The scope of this storage is limited to the session, which means that once the session is terminated all stored information will be deleted from memory.

A session is started when a program starts by user interaction i.e. from the menu. Subsequent programs that are started as a result of related

Features

Store a value to session

To store a value to session storage layer you can use the session API method. The parameter name i.e. key can be anything. The value can be any object, so it is not limited to primitive types.

Example:

double finalSalesPrice = calculateFinalSalesPrice()
session.parameters.put("salesPrice", finalSalesPrice)

Check if a parameter is present in the session

To check if a parameter has been stored in the session you can try to retrieve the value and check if it is null or do it in the Groovy style by just checking the value.

Example 1:

if (session.parameters.get("salesPrice") == null) {
  double finalSalesPrice = calculateFinalSalesPrice()
  session.parameters.put("salesPrice", finalSalesPrice)
}

Example 2:

if (session.parameters.get("salesPrice")) {
  double finalSalesPrice = calculateFinalSalesPrice()
  session.parameters.put("salesPrice", finalSalesPrice)
}

Considerations and Guidelines

Although the size limit of this storage is undocumented, it should be used with considerations. Storing too much information in this layer should be avoided and moved to database instead.