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Support for scheduling.
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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.apache.sling.commons.scheduler;

import java.io.Serializable;
import java.util.Map;

import org.osgi.annotation.versioning.ProviderType;

/**
 * Scheduler options provide an extensible way of defining how to schedule a job.
 * An option can be created via the scheduler.
 *
 * @since 2.3
 */
@ProviderType
public interface ScheduleOptions {

    /**
     * Add optional configuration for the job.
     * @param config An optional configuration object - this configuration is only passed to the job the job implements {@link Job}.
     * @return The schedule options.
     */
    ScheduleOptions config(Map config);

    /**
     * Sets the name of the job.
     * A job only needs a name if it is scheduled and should be cancelled later on. The name can then be used to cancel the job.
     * If a second job with the same name is started, the second one replaces the first one.
     * @param name The job name
     * @return The schedule options.
     */
    ScheduleOptions name(String name);

    /**
     * Flag indicating whether the job can be run concurrently.
     * This defaults to false.
     * @param flag Whether this job can run even if previous scheduled runs are still running.
     * @return The schedule options.
     */
    ScheduleOptions canRunConcurrently(boolean flag);

    /**
     * Flag indicating whether the job should only be run on the leader. This defaults to false.
     * If this job is scheduled on the leader it is started. Scheduling this job on any other
     * instance will not start it. This option should only be used if the schedule call is done
     * on all instances in the cluster.
     * If no topology information is available (= no Apache Sling Discovery Implementation active)
     * the job is not run at all.
     *
     * If {@link #onSingleInstanceOnly(boolean)} or {@link #onInstancesOnly(String[])} has been called before,
     * that option is reset and overwritten by the value of this method.
     * @param flag Whether this job should only be run on the leader
     * @return The schedule options.
     */
    ScheduleOptions onLeaderOnly(boolean flag);

    /**
     * Flag indicating whether the job should only be run on a single instance in a cluster
     * This defaults to false. Scheduling this job might start it or not depending on the
     * topology information. This option should only be used if the schedule call is done
     * on all instances in the cluster.
     * If no topology information is available (= no Apache Sling Discovery Implementation active)
     * this job is not run at all.
     *
     * If {@link #onLeaderOnly(boolean)} or {@link #onInstancesOnly(String[])} has been called before,
     * that option is reset and overwritten by the value of this method.
     * @param flag Whether this job should only be run on a single instance.
     * @return The schedule options.
     */
    ScheduleOptions onSingleInstanceOnly(boolean flag);

    /**
     * List of Sling IDs this job should be run on.
     * This job is only started if the current instance is in the set of IDs. This option should
     * only be used, if it is scheduled on all instances in the cluster.
     *
     * If {@link #onLeaderOnly(boolean)} or {@link #onSingleInstanceOnly(boolean)} has been called before,
     * that option is reset and overwritten by the value of this method.
     *
     * @param slingIds Array of Sling IDs this job should run on
     * @return The schedule options.
     */
    ScheduleOptions onInstancesOnly(String[] slingIds);

    /**
     * Define the thread pool to be used.
     * Scheduled jobs can run using different thread pools. By default, the default
     * thread pool of the scheduler is used.
     * If a thread pool name is specified, it is up to the scheduler to put the job
     * in the defined thread pool or any other thread pool.
     * This option must be used with special care as it might create new thread pools.
     * It should only be used if there is a good reason to not use the default thread
     * pool.
     *
     * @param name The thread pool name
     * @return The schedule options.
     * @since 2.5.0
     */
    ScheduleOptions threadPoolName(String name);
}