PurgeCacheJob.java

package es.usc.citius.servando.calendula.jobs;

import android.support.annotation.NonNull;
import android.util.Log;

import com.evernote.android.job.Job;
import com.evernote.android.job.JobManager;
import com.evernote.android.job.JobRequest;

import org.joda.time.Duration;

import es.usc.citius.servando.calendula.util.HtmlCacheManager;

/**
 * Created by alvaro.brey.vilas on 17/11/16.
 */

public class PurgeCacheJob extends Job {

    public final static String TAG = "PurgeCacheJob";

    private static final Integer PERIOD_DAYS = 30;

    PurgeCacheJob() {
    }

    @NonNull
    @Override
    protected Result onRunJob(Params params) {
        Log.d(TAG, "onRunJob: Job started");
        Integer purged = HtmlCacheManager.getInstance().purgeCache();
        Log.d(TAG, "onRunJob: Purged " + purged + " entries");
        return Result.SUCCESS;
    }

    public static void scheduleJob() {
        // if there's already exactly one purge job running, leave it be
        int jobs = JobManager.instance().getAllJobsForTag(PurgeCacheJob.TAG).size();
        int requests = JobManager.instance().getAllJobRequestsForTag(PurgeCacheJob.TAG).size();

        Log.d(TAG, "scheduleJob: There are " + jobs + " running and " + requests + " requests already");
        if (jobs + requests != 1) {
            // if not, cancel all jobs just to be safe:
            Log.v(TAG, "Removing duplicate jobs/requests");
            JobManager.instance().cancelAllForTag(PurgeCacheJob.TAG);
            //and create one
            Log.v(TAG, "Scheduling new job");
            new JobRequest.Builder(PurgeCacheJob.TAG)
                    .setPeriodic(Duration.standardDays(PERIOD_DAYS).getMillis())
                    .setRequiresDeviceIdle(true)
                    .setPersisted(true)
                    .build()
                    .schedule();
        }
    }

}