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Communicating sequential process via channels, similar to Golang's channels. A channel could be imagine as a pipe which connects some processes.

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/*
 * Copyright (C) 2015-2018 SoftIndex LLC.
 *
 * 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 io.datakernel.csp;

import io.datakernel.csp.dsl.ChannelConsumerTransformer;
import io.datakernel.csp.queue.ChannelQueue;
import io.datakernel.csp.queue.ChannelZeroBuffer;
import io.datakernel.promise.Promise;

import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;

@FunctionalInterface
public interface ChannelOutput {
	void set(ChannelConsumer output);

	default void set(Promise> outputPromise) {
		set(ChannelConsumer.ofPromise(outputPromise));
	}

	default ChannelSupplier getSupplier() {
		return getSupplier(new ChannelZeroBuffer<>());
	}

	default ChannelSupplier getSupplier(ChannelQueue queue) {
		set(queue.getConsumer());
		return queue.getSupplier();
	}

	default  ChannelOutput transformWith(ChannelConsumerTransformer> fn) {
		return output -> set(output.transformWith(fn));
	}

	default  ChannelOutput map(Function fn) {
		return output -> set(output.map(fn));
	}

	default  ChannelOutput mapAsync(Function> fn) {
		return output -> set(output.mapAsync(fn));
	}

	default ChannelOutput filter(Predicate predicate) {
		return output -> set(output.filter(predicate));
	}

	default ChannelOutput peek(Consumer peek) {
		return output -> set(output.peek(peek));
	}

	default Promise bindTo(ChannelInput to) {
		return bindTo(to, new ChannelZeroBuffer<>());
	}

	default Promise bindTo(ChannelInput to, ChannelQueue queue) {
		Promise extraAcknowledgement = to.set(queue.getSupplier());
		set(queue.getConsumer(extraAcknowledgement));
		return extraAcknowledgement;
	}

}