com.lithium.flow.util.Needle Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2015 Lithium Technologies, Inc.
 *
 * 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 com.lithium.flow.util;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Collections;
import java.util.List;
import java.util.concurrent.Callable;

import javax.annotation.Nonnull;

import com.google.common.collect.Lists;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;

/**
 * @author Matt Ayres
 */
public class Needle {
	private final Threader threader;
	private final List> futures = Collections.synchronizedList(Lists.newArrayList());

	public Needle(@Nonnull Threader threader) {
		checkNotNull(threader);
		this.threader = checkNotNull(threader);
	}

	public void execute(@Nonnull String name, @Nonnull Executable executable) {
		submit(name, () -> {
			executable.call();
			return null;
		});
	}

	@Nonnull
	public ListenableFuture submit(@Nonnull String name, @Nonnull Callable callable) {
		checkNotNull(name);
		checkNotNull(callable);

		ListenableFuture future = threader.submit(name, callable);
		futures.add(future);
		return future;
	}

	@Nonnull
	public List finish() {
		return Unchecked.get(() -> Futures.successfulAsList(futures).get());
	}
}