org.diorite.impl.scheduler.DioriteTaskImpl.java Source code

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Here is the source code for org.diorite.impl.scheduler.DioriteTaskImpl.java

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016. Diorite (by Bartomiej Mazur (aka GotoFinal))
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package org.diorite.impl.scheduler;

import java.lang.ref.WeakReference;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

import org.diorite.Diorite;
import org.diorite.plugin.BasePlugin;
import org.diorite.scheduler.DioriteTask;
import org.diorite.scheduler.Synchronizable;

public class DioriteTaskImpl implements DioriteTask, Runnable {
    protected static final int STATE_SINGLE = -1;
    protected static final int STATE_CANCEL = -2;
    protected static final int STATE_FUTURE = -3;
    protected static final int STATE_FUTURE_DONE = -4;

    private volatile DioriteTaskImpl next = null;
    private volatile long period;
    private long nextRun;
    private final String name;
    private final Runnable task;
    private final BasePlugin dioritePlugin;
    private final boolean safeMode;
    private final WeakReference<Synchronizable> synchronizable;
    private final int id;

    DioriteTaskImpl(final String name) {
        this(name, null, null, null, false, -1, STATE_SINGLE);
    }

    DioriteTaskImpl(final String name, final Runnable task) {
        this(name, null, task, null, false, -1, STATE_SINGLE);
    }

    DioriteTaskImpl(final Runnable task) {
        this(task.getClass().getName() + "@" + System.identityHashCode(task), null, task, null, false, -1,
                STATE_SINGLE);
    }

    DioriteTaskImpl(final String name, final BasePlugin dioritePlugin, final Runnable task,
            final Synchronizable synchronizable, final boolean safeMode, final int id, final long period) {
        this.name = name;
        this.dioritePlugin = dioritePlugin;
        this.task = task;
        this.safeMode = safeMode;
        this.synchronizable = new WeakReference<>(synchronizable);
        this.id = id;
        this.period = period;
    }

    @Override
    public final int getTaskId() {
        return this.id;
    }

    @Override
    public final BasePlugin getOwner() {
        return this.dioritePlugin;
    }

    @Override
    public boolean isAsync() {
        return false;
    }

    @Override
    public boolean isSynchronizedTo(final Synchronizable obj) {
        return !this.isAsync() && obj.equals(this.checkReference());
    }

    @Override
    public boolean isSynchronizedTo(final Class<? extends Synchronizable> clazz) {
        if (this.isAsync()) {
            return false;
        }
        final Synchronizable sync = this.checkReference();
        return (sync != null) && clazz.isInstance(sync);
    }

    @Override
    public Synchronizable getSynchronizable() {
        return this.checkReference();
    }

    private Synchronizable checkReference() {
        final Synchronizable sync = this.synchronizable.get();
        if (this.safeMode) {
            if (sync == null) {
                this.cancel();
                return null;
            }
            if (!sync.isValidSynchronizable()) {
                this.synchronizable.clear();
                this.cancel();
                return null;
            }
        }
        return sync;
    }

    @Override
    public void run() {
        this.task.run();
    }

    @Override
    public String getTaskName() {
        return this.name;
    }

    public long getPeriod() {
        return this.period;
    }

    void setPeriod(final long period) {
        this.period = period;
    }

    public long getNextRun() {
        return this.nextRun;
    }

    void setNextRun(final long nextRun) {
        this.nextRun = nextRun;
    }

    DioriteTaskImpl getNext() {
        return this.next;
    }

    void setNext(final DioriteTaskImpl next) {
        this.next = next;
    }

    public Runnable getTask() {
        return this.task;
    }

    @Override
    public void cancel() {
        Diorite.getScheduler().cancelTask(this.id);
    }

    public boolean forceCancel() {
        this.period = STATE_CANCEL;
        return true;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE).appendSuper(super.toString())
                .append("period", this.period).append("nextRun", this.nextRun).append("task", this.task)
                .append("plugin", this.dioritePlugin).append("synchronizable", this.synchronizable)
                .append("id", this.id).toString();
    }
}