name.martingeisse.wicket.model.FuturePollModel.java Source code

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Here is the source code for name.martingeisse.wicket.model.FuturePollModel.java

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/**
 * Copyright (c) 2010 Martin Geisse
 *
 * This file is distributed under the terms of the MIT license.
 */

package name.martingeisse.wicket.model;

import java.util.concurrent.Future;
import org.apache.wicket.model.AbstractReadOnlyModel;

/**
 * A model that will return the value from a {@link Future}, or null if
 * the future has not finished yet or has failed.
 * 
 * @param <T> the model type, which is also the type returned by the future
 */
public final class FuturePollModel<T> extends AbstractReadOnlyModel<T> {

    /**
     * the future
     */
    private final Future<T> future;

    /**
     * Constructor.
     * @param future the future
     */
    public FuturePollModel(Future<T> future) {
        this.future = future;
    }

    /**
     * Getter method for the future.
     * @return the future
     */
    public Future<T> getFuture() {
        return future;
    }

    /* (non-Javadoc)
     * @see org.apache.wicket.model.AbstractReadOnlyModel#getObject()
     */
    @Override
    public T getObject() {
        try {
            return future.isDone() ? future.get() : null;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

}