server core module

1 files changed, 36 insertions, 0 deletions

diff --git a/server-core/src/main/java/com/juick/util/ThreadHelper.java b/server-core/src/main/java/com/juick/util/ThreadHelper.java
new file mode 100644
index 00000000..7304d158
--- /dev/null
+++ b/server-core/src/main/java/com/juick/util/ThreadHelper.java
@@ -0,0 +1,36 @@
+package com.juick.util;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Created by aalexeev on 11/11/16.
+ */
+public class ThreadHelper {
+    private ThreadHelper() {
+        throw new IllegalStateException();
+    }
+
+    private static Logger logger = LoggerFactory.getLogger(ThreadHelper.class);
+
+    public static void shutdownAndAwaitTermination(ExecutorService pool) {
+        pool.shutdown(); // Disable new tasks from being submitted
+        try {
+            // Wait a while for existing tasks to terminate
+            if (!pool.awaitTermination(5, TimeUnit.SECONDS)) {
+                pool.shutdownNow(); // Cancel currently executing tasks
+                // Wait a while for tasks to respond to being cancelled
+                if (!pool.awaitTermination(5, TimeUnit.SECONDS))
+                    logger.error("Pool did not terminate");
+            }
+        } catch (InterruptedException ie) {
+            // (Re-)Cancel if current thread also interrupted
+            pool.shutdownNow();
+            // Preserve interrupt status
+            Thread.currentThread().interrupt();
+        }
+    }
+}