Allow new layouts if BDB is read-only.

2 files changed, 23 insertions, 4 deletions

diff --git a/src/main/java/com/amazon/carbonado/layout/Layout.java b/src/main/java/com/amazon/carbonado/layout/Layout.java
index 0c7ab83..98df22c 100644
--- a/src/main/java/com/amazon/carbonado/layout/Layout.java
+++ b/src/main/java/com/amazon/carbonado/layout/Layout.java
@@ -518,13 +518,17 @@ public class Layout {
     }

 

     // Assumes caller is in a transaction.

-    void insert(int generation) throws PersistException {

+    void insert(boolean readOnly, int generation) throws PersistException {

         if (mAllProperties == null) {

             throw new IllegalStateException();

         }

 

         mStoredLayout.setGeneration(generation);

 

+        if (readOnly) {

+            return;

+        }

+

         try {

             mStoredLayout.insert();

         } catch (UniqueConstraintException e) {

diff --git a/src/main/java/com/amazon/carbonado/layout/LayoutFactory.java b/src/main/java/com/amazon/carbonado/layout/LayoutFactory.java
index 92099dd..7b7953b 100644
--- a/src/main/java/com/amazon/carbonado/layout/LayoutFactory.java
+++ b/src/main/java/com/amazon/carbonado/layout/LayoutFactory.java
@@ -102,6 +102,21 @@ public class LayoutFactory implements LayoutCapability {
     public Layout layoutFor(Class<? extends Storable> type, LayoutOptions options)

         throws FetchException, PersistException

     {

+        return layoutFor(false, type, options);

+    }

+

+    /**

+     * Returns the layout matching the current definition of the given type.

+     *

+     * @param readOnly if true, don't attempt to persist new generation because

+     * underlying repository is read-only

+     * @throws PersistException if type represents a new generation, but

+     * persisting this information failed

+     */

+    public Layout layoutFor(boolean readOnly,

+                            Class<? extends Storable> type, LayoutOptions options)

+        throws FetchException, PersistException

+    {

         if (options != null) {

             // Make side-effect consistently applied.

             options.readOnly();

@@ -132,7 +147,7 @@ public class LayoutFactory implements LayoutCapability {
                     txn = mRepository.enterTransaction(IsolationLevel.READ_COMMITTED);

                 }

 

-                txn.setForUpdate(true);

+                txn.setForUpdate(!readOnly);

                 try {

                     // If type represents a new generation, then a new layout needs to

                     // be inserted.

@@ -207,7 +222,7 @@ public class LayoutFactory implements LayoutCapability {
                         cursor.close();

                     }

 

-                    newLayout.insert(generation);

+                    newLayout.insert(readOnly, generation);

                     layout = newLayout;

 

                     txn.commit();

@@ -247,7 +262,7 @@ public class LayoutFactory implements LayoutCapability {
             }

         }

 

-        if (resyncCap != null) {

+        if (!readOnly && resyncCap != null) {

             // Make sure that all layout records are sync'd.

             try {

                 resyncCap.resync(StoredLayoutProperty.class, 1.0, null);