Make timeout static

Author: tvhung83

src/main/java/org/embulk/output/sftp/utils/TimeoutCloser.java

@@ -10,8 +10,7 @@
 
 public class TimeoutCloser implements Closeable
 {
-    @VisibleForTesting
-    int timeout = 300; // 5 minutes
+    private static int timeout = 300; // 5 minutes
     private Closeable wrapped;
 
     public TimeoutCloser(Closeable wrapped)
@@ -39,4 +38,10 @@ public Void call() throws Exception
             throw Throwables.propagate(e);
         }
     }
+
+    @VisibleForTesting
+    public static void setTimeout(int timeout)
+    {
+        TimeoutCloser.timeout = timeout;
+    }
 }

src/test/java/org/embulk/output/sftp/utils/TestTimeoutCloser.java

@@ -32,7 +32,7 @@ public void close()
                 }
             }
         });
-        closer.timeout = 1;
+        TimeoutCloser.setTimeout(1);
         try {
             closer.close();
             fail("Should not finish");