static scope = "flow"
13.2 Scoped Services
Version: 3.3.3
13.2 Scoped Services
By default, access to service methods is not synchronised, so nothing prevents concurrent execution of those methods. In fact, because the service is a singleton and may be used concurrently, you should be very careful about storing state in a service. Or take the easy (and better) road and never store state in a service.
You can change this behaviour by placing a service in a particular scope. The supported scopes are:
-
prototype- A new service is created every time it is injected into another class -
request- A new service will be created per request -
flash- A new service will be created for the current and next request only -
flow- In web flows the service will exist for the scope of the flow -
conversation- In web flows the service will exist for the scope of the conversation. ie a root flow and its sub flows -
session- A service is created for the scope of a user session -
singleton(default) - Only one instance of the service ever exists
If your service is flash, flow or conversation scoped it must implement java.io.Serializable and can only be used in the context of a Web Flow.
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To enable one of the scopes, add a static scope property to your class whose value is one of the above, for example
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Upgrading
Starting with Grails 2.3, new applications are generated with configuration that defaults the scope of controllers to See Controllers and Scopes in the user guide for more information. |