クエリページネーションサポートの追加

@Paged
@Processor
    public ProviderAwarePagingDelegate query(String query, final PagingConfiguration pagingConfiguration) throws Exception
{
    return new CustomPagingDelegate(query,pagingConfiguration);
}

public QueryResult executeQuery(String query, String nextItem) throws Exception {
        myServiceClient.query(query,nextItem);
}
java✓ コピー済み

public abstract class ProviderAwarePagingDelegate<T, P> implements Closeable

{
    /**
     * Returns the next page of items. If the return value is
     * <code>null</code> or an empty list, then it means
     * no more items are available
     *
     * @param provider The provider to be used to do the query.
     * You can assume this provider is already properly initialized
     * @return a populated list of elements. <code>null</code>
     * or an empty list, then it means no more items are available
     * @throws Exception
     */
    public abstract List<T> getPage(P provider) throws Exception;

    /**
     * Returns the total amount of items in the non-paged result set.
     * In some scenarios, it might not be possible or
     * convenient to actually retrieve this value. -1 is
     * returned in such a case.
     *
     * @param provider The provider to be used to do the query.
     * You can assume this provider is already properly initialized.
     */
    public abstract int getTotalResults(P provider) throws Exception;

    /**
     * Close whatever external resource you might use
     */
    @Override
    public void close() throws MuleException;

}
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/**
 * Example of Paging Delegate implementation
 */
public class CustomPagingDelegate extends ProviderAwarePagingDelegate<Item,CustomConnector> {
    List<Item> cachedPage;
    String query;
    String nextItem;
    int totalItems = -1;

    public CustomPagingDelegate(String query, PagingConfiguration pagingConfiguration) {
        this.query = query;
    }

    @Override
    public List<Item> getPage(CustomConnector provider) throws Exception {
        if (cachedPage != null) return cachedPage;
        QueryResult queryResult = provider.executeQuery(query,nextItem);
        nextItem = queryResult.nextItem();
        return queryResult.items();
    }
    @Override
    public int getTotalResults(CustomConnector provider) throws Exception {
        if (totalItems != -1) return totalItems;
        QueryResult queryResult = provider.executeQuery(query,nextItem);
        nextItem = queryResult.nextItem();
        totalItems = queryResult.totalItemsCount();
        cachedPage = queryResult.items();
        return totalItems;
    }
    @Override
    public void close() throws MuleException {
        //Close whatever external resource you might use
    }
}
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