Auto-reconnect: if another connection uses the database in exclusive mode then…

Auto-reconnect: if another connection uses the database in exclusive mode then this connection will try to re-connect until the exclusive mode ends.

h2/src/docsrc/html/changelog.html

@@ -29,6 +29,9 @@ Change Log
 </li><li>Cluster: after a cluster node failed, the second cluster node can now be re-created
     and started without having to stop the first cluster node, and without having to stop
     running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
+</li><li>Auto-reconnect: if another connection uses the database in exclusive mode 
+    then this connection will try to re-connect until the exclusive mode ends.
+    This is important when using the cluster mode.
 </li><li>SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
 </li><li>Installing the H2 as a service should now work on Windows 7.
     The batch files now explicitly set the directory using pushd "%~dp0".

h2/src/docsrc/html/features.html

@@ -1114,6 +1114,10 @@ variables and local temporary tables definitions (excluding data) are re-created
 The contents of the system table <code>INFORMATION_SCHEMA.SESSION_STATE</code>
 contains all client side state that is re-created.
 </p>
+<p>
+If another connection uses the database in exclusive mode (enabled using <code>SET EXCLUSIVE 1</code>
+or <code>SET EXCLUSIVE 2</code>), then this connection will try to re-connect until the exclusive mode ends.
+</p>
 
 <h2 id="auto_mixed_mode">Automatic Mixed Mode</h2>
 <p>

h2/src/main/org/h2/engine/SessionRemote.java

@@ -427,7 +427,22 @@ public class SessionRemote extends SessionWithState implements SessionFactory, D
             return false;
         }
         lastReconnect++;
+        while (true) {
+            try {
                 embedded = connectEmbeddedOrServer(false);
+                break;
+            } catch (DbException e) {
+                if (e.getErrorCode() != ErrorCode.DATABASE_IS_IN_EXCLUSIVE_MODE) {
+                    throw e;
+                }
+                // exclusive mode: re-try endlessly
+                try {
+                    Thread.sleep(500);
+                } catch (Exception e2) {
+                    // ignore
+                }
+            }
+        }
         if (embedded == this) {
             // connected to a server somewhere else
             embedded = null;

h2/src/test/org/h2/test/TestAll.java

@@ -301,15 +301,6 @@ java org.h2.test.TestAll timer
 
 test with small freeList pages, page size 64
 
-test services on Windows
-
-exclusive + auto_restart = retry
-
-data store: automatically fast when moving data from two repositories that
-share the same data store, using special input stream classes
-
-h2-schema function
-
 power failure test
 power failure test: MULTI_THREADED=TRUE
 power failure test: larger binaries and additional index.