Task

package com.runescape.task;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * Represents a {@link Task} for the application.
 *
 * @author Braeden Dempsey
 */
public abstract class Task {

    /**
     * Constructs a default {@link Task}.
     * @param delay the interval between a cycle.
     * @param unit the {@link java.util.concurrent.TimeUnit} of the {@link com.runescape.task.Task}.
     */
    public Task(final int delay, final TimeUnit unit) {
        this.delay = delay;
        this.unit = unit;
    }

    /**
     * Interval between cycles.
     */
    private final int delay;

    /**
     * {@link TimeUnit} of the {@link Task}.
     */
    private final TimeUnit unit;

    /**
     * {@link TaskState} of the {@link Task}.
     */
    private TaskState state;

    /**
     * Scheduler of the {@link Task}.
     */
    private ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor();

    /**
     * Executes the {@link Task}.
     */
    protected abstract void execute();

    /**
     * Pauses the {@link Task}.
     */
    public void pause() {
        state = TaskState.PAUSED;
    }

    /**
     * Registers a {@link Task}.
     */
    public void initialize() {
        if (!state.equals(TaskState.ACTIVE) || !service.isShutdown())
            service.scheduleAtFixedRate(new TaskManager(), 0, delay, unit);
        state = TaskState.ACTIVE;
    }

    /**
     * Remove a {@link Task}.
     */
    public void kill() {
        state = TaskState.DEAD;
        service.shutdown();
    }

    /**
     * Checks if the {@link TaskState} equals <code>PAUSED</code>.
     * @return the <code>state</code>.
     */
    public boolean isPaused() {
        return state.equals(TaskState.PAUSED);
    }

    /**
     * Checks if the {@link TaskState} equals <code>ACTIVE</code>.
     * @return the <code>state</code>.
     */
    public boolean isActive() {
        return state.equals(TaskState.ACTIVE);
    }

}