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Efficient non-blocking network and file I/O, for building Node.js-like client/server applications with high performance requirements. It is similar to Event Loop in Node.js. Although Eventloop runs in a single thread, multiple event loops can be launched at the same time allowing for efficient CPU usage.

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/*
 * Copyright (C) 2015 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.eventloop;

import io.datakernel.common.time.CurrentTimeProvider;
import org.jetbrains.annotations.NotNull;

import java.time.Duration;
import java.time.Instant;

@SuppressWarnings("unused")
public interface Scheduler extends CurrentTimeProvider {
	@NotNull
	default ScheduledRunnable schedule(@NotNull Instant instant, @NotNull Runnable runnable) {
		return schedule(instant.toEpochMilli(), runnable);
	}

	@NotNull
	ScheduledRunnable schedule(long timestamp, @NotNull Runnable runnable);

	@NotNull
	default ScheduledRunnable delay(@NotNull Duration delay, @NotNull Runnable runnable) {
		return delay(delay.toMillis(), runnable);
	}

	@NotNull
	default ScheduledRunnable delay(long delayMillis, @NotNull Runnable runnable) {
		return schedule(currentTimeMillis() + delayMillis, runnable);
	}

	@NotNull
	default ScheduledRunnable scheduleBackground(@NotNull Instant instant, @NotNull Runnable runnable) {
		return scheduleBackground(instant.toEpochMilli(), runnable);
	}

	@NotNull
	ScheduledRunnable scheduleBackground(long timestamp, @NotNull Runnable runnable);

	@NotNull
	default ScheduledRunnable delayBackground(@NotNull Duration delay, @NotNull Runnable runnable) {
		return delayBackground(delay.toMillis(), runnable);
	}

	@NotNull
	default ScheduledRunnable delayBackground(long delayMillis, @NotNull Runnable runnable) {
		return scheduleBackground(currentTimeMillis() + delayMillis, runnable);
	}
}