/*******************************************************************************
* Copyright (c) 2012-2017 Codenvy, S.A.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Codenvy, S.A. - initial API and implementation
*******************************************************************************/
package org.eclipse.che.api.promises.async;
import org.eclipse.che.api.promises.client.Function;
import org.eclipse.che.api.promises.client.FunctionException;
import org.eclipse.che.api.promises.client.Promise;
import org.eclipse.che.api.promises.client.js.Promises;
/**
* Helper class, allows prevent accumulation of sequential async tasks.
*
* @author Evgen Vidolob
*/
public class Throttler {
private Promise current = Promises.resolve(null);
@SuppressWarnings("unchecked")
public <T> Promise<T> queue(final Task<Promise<T>> promiseFactory) {
return current = current.thenPromise(new Function<Object, Promise>() {
@Override
public Promise apply(Object arg) throws FunctionException {
return promiseFactory.run();
}
});
}
}