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oracle.adf.view.rich.model
Interface AsyncFetch

public interface AsyncFetch

Interface to be implemented by the data models that support fetching data on the thread other then the request thread. If isAsynchronousFetchSupported() returns true, the framework may call fetch() on a different thread. A model should implement this interface and should return from isAsynchronousFetchSupported() only if:

• It does not realy on a non-inheritable ThreadLocal associated with a request thread by servlet filters or some other mechanism
• It can run in a multithreaded environment
• It does not rely on the state of the component that is a parent of this model's component. For example, if the model's component is being stamped by af:iterator, the model cannot rely on using iterator's var or currency information

Method Summary

AsyncFetcher	getAsyncFetcher(java.lang.Object fetchConstraint) Returns an AsyncFetcher instance capable of fetching data for the specified fetchConstraint or null if this fetchConstraint type is not supported.
boolean	isSupportedFetchConstraint(java.lang.Class<?> fetchConstraintsClass) Returns true if the AsyncFetch model supports asynchronous fetch of constaints of fetchConstraintsClass type.

Method Detail

isSupportedFetchConstraint

boolean isSupportedFetchConstraint(java.lang.Class<?> fetchConstraintsClass)

Returns true if the AsyncFetch model supports asynchronous fetch of constaints of fetchConstraintsClass type.

This method is designed to aid Renderers registering for data streaming in the case where the Renderer could register any of a number of different context objects and wants to pick a fetch constraint class supported for parallel execution by the AsyncFetch model.

Parameters:

fetchConstraintsClass - fetch constraint implementation class to test

Returns:

true if the AsyncFetch model supports asynchronous fetch of constaints of the specified type.

See Also:

getAsyncFetcher(java.lang.Object)

getAsyncFetcher

AsyncFetcher getAsyncFetcher(java.lang.Object fetchConstraint)

Returns an AsyncFetcher instance capable of fetching data for the specified fetchConstraint or null if this fetchConstraint type is not supported. If no fetcher is returned, the fetch for this constraint will not run in parallel.

Parameters:

fetchConstraint - Constraint that will be passed to the returned AsyncFetcher's isFetched and fetch methods.

Returns:

an AsyncFetcher capable of fetching data for this fetchConstraint

See Also:

AsyncFetcher.isFetched(oracle.adf.view.rich.model.AsyncFetch, java.lang.Object), AsyncFetcher.fetch(oracle.adf.view.rich.model.AsyncFetch, java.lang.Object, java.lang.Object)

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