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Timer API to schedule jobs
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.kie.kogito.timer.impl;

import java.io.Serializable;
import java.util.Date;
import java.util.concurrent.Callable;

import org.kie.kogito.timer.InternalSchedulerService;
import org.kie.kogito.timer.Job;
import org.kie.kogito.timer.JobContext;
import org.kie.kogito.timer.JobHandle;
import org.kie.kogito.timer.Trigger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DefaultTimerJobInstance
        implements
        Callable,
        Comparable,
        TimerJobInstance, Serializable {

    private static final long serialVersionUID = -4441139572159254264L;

    protected static final transient Logger logger = LoggerFactory.getLogger(DefaultTimerJobInstance.class);

    private final Job job;
    private final Trigger trigger;
    private final JobContext ctx;
    protected transient InternalSchedulerService scheduler;
    private final JobHandle handle;

    public DefaultTimerJobInstance(Job job,
            JobContext ctx,
            Trigger trigger,
            JobHandle handle,
            InternalSchedulerService scheduler) {
        this.job = job;
        this.ctx = ctx;
        this.trigger = trigger;
        this.handle = handle;
        this.scheduler = scheduler;
    }

    public int compareTo(DefaultTimerJobInstance o) {
        return this.trigger.hasNextFireTime().compareTo(o.getTrigger().hasNextFireTime());
    }

    public Void call() throws Exception {
        try {
            this.trigger.nextFireTime(); // need to pop
            if (handle.isCancel()) {
                return null;
            }
            this.job.execute(this.ctx);
            if (handle.isCancel()) {
                return null;
            }

            // our triggers allow for flexible rescheduling
            Date date = this.trigger.hasNextFireTime();
            if (date != null) {
                scheduler.internalSchedule(this);
            }
        } catch (Exception e) {
            logger.warn("Unable to execute timer job!", e);
            throw e;
        }

        return null;
    }

    public JobHandle getJobHandle() {
        return handle;
    }

    public Job getJob() {
        return job;
    }

    public Trigger getTrigger() {
        return trigger;
    }

    public JobContext getJobContext() {
        return ctx;
    }
}