implemented small scheduler engine

scm-webapp/src/main/java/sonia/scm/schedule/QuartzScheduler.java

@@ -0,0 +1,175 @@
+/***
+ * Copyright (c) 2015, Sebastian Sdorra
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of SCM-Manager; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * https://bitbucket.org/sdorra/scm-manager
+ * 
+ */
+
+package sonia.scm.schedule;
+
+import com.google.common.base.Throwables;
+import com.google.inject.Injector;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import javax.inject.Inject;
+import org.quartz.CronScheduleBuilder;
+import org.quartz.JobBuilder;
+import org.quartz.JobDataMap;
+import org.quartz.JobDetail;
+import org.quartz.SchedulerException;
+import org.quartz.Trigger;
+import org.quartz.TriggerBuilder;
+import org.quartz.impl.StdSchedulerFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import sonia.scm.Initable;
+import sonia.scm.SCMContextProvider;
+
+/**
+ * {@link Scheduler} which uses the quartz scheduler.
+ * 
+ * @author Sebastian Sdorra
+ * @since 1.47
+ * 
+ * @see <a href="http://www.quartz-scheduler.org/">Quartz Job Scheduler</a>
+ */
+@Singleton
+public class QuartzScheduler implements Scheduler, Initable {
+  
+  private static final Logger logger = LoggerFactory.getLogger(QuartzScheduler.class);
+  
+  private final Injector injector;
+  private final org.quartz.Scheduler scheduler;
+
+  /**
+   * Creates a new quartz scheduler.
+   * 
+   * @param injector injector
+   */
+  @Inject
+  public QuartzScheduler(Injector injector)
+  {
+    this.injector = injector;
+    
+    // get default scheduler
+    try {
+        scheduler = StdSchedulerFactory.getDefaultScheduler();
+    } catch (SchedulerException ex) {
+        throw Throwables.propagate(ex);
+    }
+  }
+
+  /**
+   * Creates a new quartz scheduler. This constructor is only for testing.
+   * 
+   * @param injector injector
+   * @param scheduler quartz scheduler
+   */
+  QuartzScheduler(Injector injector, org.quartz.Scheduler scheduler)
+  {
+    this.injector = injector;
+    this.scheduler = scheduler;
+  }
+  
+  @Override
+  public void init(SCMContextProvider context)
+  {
+    try 
+    {
+      if (!scheduler.isStarted())
+      {
+        scheduler.start();
+      }
+    } 
+    catch (SchedulerException ex)
+    {
+      logger.error("can not start scheduler", ex);
+    }
+  }
+
+  @Override
+  public void close() throws IOException
+  {
+    try
+    {
+      if (scheduler.isStarted()){
+        scheduler.shutdown();
+      }
+    } 
+    catch (SchedulerException ex)
+    {
+      logger.error("can not stop scheduler", ex);
+    }
+  }
+  
+  @Override
+  public Task schedule(String expression, final Runnable runnable)
+  {
+    return schedule(expression, new Provider<Runnable>(){
+      @Override
+      public Runnable get()
+      {
+        return runnable;
+      }
+    });
+  }
+
+  @Override
+  public Task schedule(String expression, Class<? extends Runnable> runnable)
+  {
+    return schedule(expression, injector.getProvider(runnable));
+  }
+
+  private Task schedule(String expression, Provider<? extends Runnable> provider){
+    // create data map with injection provider for InjectionEnabledJob
+    JobDataMap map = new JobDataMap();
+    map.put(Runnable.class.getName(), provider);
+    map.put(Injector.class.getName(), injector);
+
+    // create job detail for InjectionEnabledJob with the provider for the annotated class
+    JobDetail detail = JobBuilder.newJob(InjectionEnabledJob.class)
+            .usingJobData(map)
+            .build();
+
+    // create a trigger with the cron expression from the annotation
+    Trigger trigger = TriggerBuilder.newTrigger()
+            .forJob(detail)
+            .withSchedule(CronScheduleBuilder.cronSchedule(expression))
+            .build();
+
+    try {
+        scheduler.scheduleJob(detail, trigger);
+    } catch (SchedulerException ex) {
+        throw Throwables.propagate(ex);
+    }
+    
+    return new QuartzTask(scheduler, trigger.getJobKey());
+  }
+
+
+}