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oracle.adf.view.rich.model
Class AsyncFetcher

java.lang.Object
oracle.adf.view.rich.model.AsyncFetcher

public abstract class AsyncFetcher

extends java.lang.Object

Class vended by AsyncFetch for performing data fetch operations off of the Request thread.

See Also:

AsyncFetch

Constructor Summary

AsyncFetcher()

Method Summary

abstract java.lang.Object	fetch(AsyncFetch model, java.lang.Object fetchConstraint) Tells the model to fetch the data specified by the fetchConstraint.
abstract boolean	isFetched(AsyncFetch model, java.lang.Object fetchConstraint) Returns true if the fetchConstraint is of a type supported by the model and all of the data specified by the fetchConstraint is either in memory or unavailable for fetching.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AsyncFetcher

public AsyncFetcher()

Method Detail

isFetched

public abstract boolean isFetched(AsyncFetch model,
                                  java.lang.Object fetchConstraint)

Returns true if the fetchConstraint is of a type supported by the model and all of the data specified by the fetchConstraint is either in memory or unavailable for fetching. An example where the data is unavailable would be a fetchConstraint that specified a row index beyond the model's row count.

If determining whether the fetchConstraint is cached in memory is extremely expensive, the implementation should return false.

Parameters:

model - AsyncFetch model to ask if the fetchConstraint is already available in memory

fetchConstraint - constraint specifying which data to fetch

Returns:

true if the fetchConstraint is already available in memory for this model.

See Also:

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

fetch

public abstract java.lang.Object fetch(AsyncFetch model,
                                       java.lang.Object fetchConstraint)
                                throws java.lang.InterruptedException

Tells the model to fetch the data specified by the fetchConstraint. This data will subsequently be accessed on the request thread.

The method will not return until all rows in the range have been fetched and cached.

This method may be called on a non-Request thread and the FacesContext may not be available.

Parameters:

model - AsyncFetch model to fetch the data from

fetchConstraint - Constraint specifying which data to fetch

Returns:

the number of Objects in the specified range that are now available

Throws:

java.lang.InterruptedException

See Also:

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

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