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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project licenses this file to you 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.netty.util.concurrent;

import java.util.Queue;
import java.util.concurrent.Callable;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

@SuppressWarnings("ComparableImplementedButEqualsNotOverridden")
final class ScheduledFutureTask extends PromiseTask implements ScheduledFuture {
    private static final AtomicLong nextTaskId = new AtomicLong();
    private static final long START_TIME = System.nanoTime();

    static long nanoTime() {
        return System.nanoTime() - START_TIME;
    }

    static long deadlineNanos(long delay) {
        return nanoTime() + delay;
    }

    private final long id = nextTaskId.getAndIncrement();
    private long deadlineNanos;
    /* 0 - no repeat, >0 - repeat at fixed rate, <0 - repeat with fixed delay */
    private final long periodNanos;

    ScheduledFutureTask(
            AbstractScheduledEventExecutor executor,
            Runnable runnable, V result, long nanoTime) {

        this(executor, toCallable(runnable, result), nanoTime);
    }

    ScheduledFutureTask(
            AbstractScheduledEventExecutor executor,
            Callable callable, long nanoTime, long period) {

        super(executor, callable);
        if (period == 0) {
            throw new IllegalArgumentException("period: 0 (expected: != 0)");
        }
        deadlineNanos = nanoTime;
        periodNanos = period;
    }

    ScheduledFutureTask(
            AbstractScheduledEventExecutor executor,
            Callable callable, long nanoTime) {

        super(executor, callable);
        deadlineNanos = nanoTime;
        periodNanos = 0;
    }

    @Override
    protected EventExecutor executor() {
        return super.executor();
    }

    public long deadlineNanos() {
        return deadlineNanos;
    }

    public long delayNanos() {
        return Math.max(0, deadlineNanos() - nanoTime());
    }

    public long delayNanos(long currentTimeNanos) {
        return Math.max(0, deadlineNanos() - (currentTimeNanos - START_TIME));
    }

    @Override
    public long getDelay(TimeUnit unit) {
        return unit.convert(delayNanos(), TimeUnit.NANOSECONDS);
    }

    @Override
    public int compareTo(Delayed o) {
        if (this == o) {
            return 0;
        }

        ScheduledFutureTask that = (ScheduledFutureTask) o;
        long d = deadlineNanos() - that.deadlineNanos();
        if (d < 0) {
            return -1;
        } else if (d > 0) {
            return 1;
        } else if (id < that.id) {
            return -1;
        } else if (id == that.id) {
            throw new Error();
        } else {
            return 1;
        }
    }

    @Override
    public void run() {
        assert executor().inEventLoop();
        try {
            if (periodNanos == 0) {
                if (setUncancellableInternal()) {
                    V result = task.call();
                    setSuccessInternal(result);
                }
            } else {
                // check if is done as it may was cancelled
                if (!isCancelled()) {
                    task.call();
                    if (!executor().isShutdown()) {
                        long p = periodNanos;
                        if (p > 0) {
                            deadlineNanos += p;
                        } else {
                            deadlineNanos = nanoTime() - p;
                        }
                        if (!isCancelled()) {
                            // scheduledTaskQueue can never be null as we lazy init it before submit the task!
                            Queue> scheduledTaskQueue =
                                    ((AbstractScheduledEventExecutor) executor()).scheduledTaskQueue;
                            assert scheduledTaskQueue != null;
                            scheduledTaskQueue.add(this);
                        }
                    }
                }
            }
        } catch (Throwable cause) {
            setFailureInternal(cause);
        }
    }

    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
        boolean canceled = super.cancel(mayInterruptIfRunning);
        if (canceled) {
            ((AbstractScheduledEventExecutor) executor()).removeScheduled(this);
        }
        return canceled;
    }

    boolean cancelWithoutRemove(boolean mayInterruptIfRunning) {
        return super.cancel(mayInterruptIfRunning);
    }

    @Override
    protected StringBuilder toStringBuilder() {
        StringBuilder buf = super.toStringBuilder();
        buf.setCharAt(buf.length() - 1, ',');

        return buf.append(" id: ")
                  .append(id)
                  .append(", deadline: ")
                  .append(deadlineNanos)
                  .append(", period: ")
                  .append(periodNanos)
                  .append(')');
    }
}