From 62ea092d9fba83670a6b9923ec776d910c331d37 Mon Sep 17 00:00:00 2001
From: Henning Baldersheim <balder@yahoo-inc.com>
Date: Tue, 25 Feb 2020 15:18:21 +0000
Subject: Add sanity checks and avoid codeduplicationi after codereview.

---
 jrt/src/com/yahoo/jrt/Connector.java | 40 +++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 16 deletions(-)

(limited to 'jrt/src')

diff --git a/jrt/src/com/yahoo/jrt/Connector.java b/jrt/src/com/yahoo/jrt/Connector.java
index 716801b4d0e..b0eeffda469 100644
--- a/jrt/src/com/yahoo/jrt/Connector.java
+++ b/jrt/src/com/yahoo/jrt/Connector.java
@@ -14,6 +14,7 @@ import java.util.concurrent.atomic.AtomicReference;
 
 class Connector implements AutoCloseable {
 
+    //TODO Move to vespajlib as utility as java does not have what we want.
     private static final Object globalLock = new Object();
     private static ExecutorService globalPrimaryExecutor = null;
     private static ExecutorService globalFallbackExecutor = null;
@@ -32,10 +33,10 @@ class Connector implements AutoCloseable {
             try {
                 primary.execute(command);
             } catch (RejectedExecutionException e1) {
-                secondary.execute(() -> retryForEver(command));
+                secondary.execute(() -> retryForever(command));
             }
         }
-        private void retryForEver(Runnable command) {
+        private void retryForever(Runnable command) {
             while (true) {
                 try {
                     primary.execute(command);
@@ -52,15 +53,31 @@ class Connector implements AutoCloseable {
     private static ExecutorWithFallback acquire() {
         synchronized (globalLock) {
             if (globalPrimaryExecutor == null) {
+                if (globalFallbackExecutor != null) {
+                    throw new IllegalStateException("fallback executor must be null !");
+                }
+                if (usages != 0) {
+                    throw new IllegalStateException("usages " + usages + " != 0");
+                }
                 globalPrimaryExecutor = new ThreadPoolExecutor(1, 64, 1L, TimeUnit.SECONDS,
                         new SynchronousQueue<>(), ThreadFactoryFactory.getDaemonThreadFactory("jrt.connector.primary"));
                 globalFallbackExecutor = Executors.newSingleThreadExecutor(ThreadFactoryFactory.getDaemonThreadFactory("jrt.connector.fallback"));
             }
-            usages ++;
+            usages++;
             return new ExecutorWithFallback(globalPrimaryExecutor, globalFallbackExecutor);
         }
     }
 
+    private static void join(ExecutorService executor) {
+        while (true) {
+            try {
+                if (executor.awaitTermination(60, TimeUnit.SECONDS)) {
+                    return;
+                }
+            } catch (InterruptedException e) {}
+        }
+    }
+
     private static void release(ExecutorWithFallback executor) {
         synchronized (globalLock) {
             if (executor.primary != globalPrimaryExecutor) {
@@ -73,19 +90,10 @@ class Connector implements AutoCloseable {
             if (usages == 0) {
                 globalPrimaryExecutor.shutdown();
                 globalFallbackExecutor.shutdown();
-                while (true) {
-                    try {
-                        if (globalPrimaryExecutor != null && globalPrimaryExecutor.awaitTermination(60, TimeUnit.SECONDS)) {
-                            globalPrimaryExecutor = null;
-                        }
-                        if (globalFallbackExecutor != null && globalFallbackExecutor.awaitTermination(60, TimeUnit.SECONDS)) {
-                            globalFallbackExecutor = null;
-                        }
-                        if (globalFallbackExecutor == null && globalFallbackExecutor == null) {
-                            return;
-                        }
-                    } catch (InterruptedException e) {}
-                }
+                join(globalPrimaryExecutor);
+                globalPrimaryExecutor = null;
+                join(globalFallbackExecutor);
+                globalFallbackExecutor = null;
             }
         }
     }
-- 
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