1 files changed, 56 insertions, 0 deletions
diff --git a/src/main/java/com/google/gerrit/git/WorkQueue.java b/src/main/java/com/google/gerrit/git/WorkQueue.java
new file mode 100644
index 0000000000..a7f47e8088
--- /dev/null
+++ b/src/main/java/com/google/gerrit/git/WorkQueue.java
@@ -0,0 +1,56 @@
+// Copyright 2009 Google Inc.
+//
+// Licensed 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 com.google.gerrit.git;
+
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+public class WorkQueue {
+  private static ScheduledThreadPoolExecutor pool;
+
+  public static synchronized void schedule(final Runnable task,
+      final long delay, final TimeUnit unit) {
+    if (pool == null) {
+      pool = new ScheduledThreadPoolExecutor(1);
+      pool.setKeepAliveTime(60, TimeUnit.SECONDS);
+      pool.setMaximumPoolSize(5);
+    }
+    pool.schedule(task, delay, unit);
+  }
+
+  public static void terminate() {
+    final ScheduledThreadPoolExecutor p = shutdown();
+    if (p != null) {
+      boolean isTerminated;
+      do {
+        try {
+          isTerminated = p.awaitTermination(10, TimeUnit.SECONDS);
+        } catch (InterruptedException ie) {
+          isTerminated = false;
+        }
+      } while (!isTerminated);
+    }
+  }
+
+  private static synchronized ScheduledThreadPoolExecutor shutdown() {
+    final ScheduledThreadPoolExecutor p = pool;
+    if (p != null) {
+      p.shutdown();
+      pool = null;
+      return p;
+    }
+    return null;
+  }
+}