Plugin updating is executed asynchronously by Quartz Scheduler

src/main/scala/plugin/PluginUpdateJob.scala

@@ -0,0 +1,66 @@
+package plugin
+
+import util.Directory._
+import org.eclipse.jgit.api.Git
+import org.slf4j.LoggerFactory
+import org.quartz.{Scheduler, JobExecutionContext, Job}
+import org.quartz.JobBuilder._
+import org.quartz.TriggerBuilder._
+import org.quartz.SimpleScheduleBuilder._
+
+class PluginUpdateJob extends Job {
+
+  private val logger = LoggerFactory.getLogger(classOf[PluginUpdateJob])
+  private var failedCount = 0
+
+  /**
+   * Clone or pull all plugin repositories
+   *
+   * TODO Support plugin repository access through the proxy server
+   */
+  override def execute(context: JobExecutionContext): Unit = {
+    try {
+      if(failedCount > 3){
+        logger.error("Skip plugin information updating because failed count is over limit")
+      } else {
+        logger.info("Start plugin information updating")
+        PluginSystem.repositories.foreach { repository =>
+          logger.info(s"Updating ${repository.id}: ${repository.url}...")
+          val dir = getPluginCacheDir()
+          val repo = new java.io.File(dir, repository.id)
+          if(repo.exists){
+            // pull if the repository is already cloned
+            Git.open(repo).pull().call()
+          } else {
+            // clone if the repository is not exist
+            Git.cloneRepository().setURI(repository.url).setDirectory(repo).call()
+          }
+        }
+        logger.info("End plugin information updating")
+      }
+    } catch {
+      case e: Exception => {
+        failedCount = failedCount + 1
+        logger.error("Failed to update plugin information", e)
+      }
+    }
+  }
+}
+
+object PluginUpdateJob {
+
+  def schedule(scheduler: Scheduler): Unit = {
+    val job = newJob(classOf[PluginUpdateJob])
+      .withIdentity("pluginUpdateJob")
+      .build()
+
+    val trigger = newTrigger()
+      .withIdentity("pluginUpdateTrigger")
+      .startNow()
+      .withSchedule(simpleSchedule().withIntervalInHours(24).repeatForever())
+      .build()
+
+    scheduler.scheduleJob(job, trigger)
+  }
+
+}