How do you create a non-Thread-based Guice custom Scope?
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by Russ
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Published on 2010-03-23T18:49:02Z
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2010/03/23
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It seems that all Guice's out-of-the-box Scope implementations are inherently Thread-based (or ignore Threads entirely):
Scopes.SINGLETON
and Scopes.NO_SCOPE
ignore Threads and are the edge cases: global scope and no scope.
ServletScopes.REQUEST
and ServletScopes.SESSION
ultimately depend on retrieving scoped objects from a ThreadLocal<Context>
. The retrieved Context
holds a reference to the HttpServletRequest
that holds a reference to the scoped objects stored as named attributes (where name is derived from com.google.inject.Key
).
Class SimpleScope
from the custom scope Guice wiki also provides a per-Thread implementation using a ThreadLocal<Map<Key<?>, Object>>
member variable.
With that preamble, my question is this: how does one go about creating a non-Thread-based Scope? It seems that something that I can use to look up a Map<Key<?>, Object>
is missing, as the only things passed in to Scope.scope() are a Key<T>
and a Provider<T>
.
Thanks in advance for your time.
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