PromiseFactory.java

/*
 * Copyright 2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.async;

import org.springframework.async.web.client.grizzly.GrizzlyFuturePromise;
import org.springframework.util.ClassUtils;

/**
 * @author Jon Brisbin <jon@jbrisbin.com>
 */
public class PromiseFactory {

	private static final boolean grizzlyPresent = ClassUtils.isPresent("org.springframework.async.web.client.grizzly.GrizzlyFuturePromise", PromiseFactory.class.getClassLoader());

	public static <T> Promise<T> createPromise(long timeout) {
		if (grizzlyPresent) {
			GrizzlyFuturePromise<T> promise = new GrizzlyFuturePromise<T>();
			promise.setTimeout(timeout);
			return promise;
		}

		throw new IllegalStateException("No Promise<T> implementation could be found.");
	}

	public static <T> Promise<T> createPromise() {
		if (grizzlyPresent) {
			return new GrizzlyFuturePromise<T>();
		}

		throw new IllegalStateException("No Promise<T> implementation could be found.");
	}

}