From df8eb2861e8ab9d6989bc369b95a44af1ca4394d Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Wed, 6 Dec 2006 20:28:21 +0000
Subject: Enhanced OptimisticLockException message.

---
 .../amazon/carbonado/OptimisticLockException.java  | 46 +++++++++++++++++++---
 .../carbonado/spi/MasterStorableGenerator.java     |  8 ++--
 2 files changed, 46 insertions(+), 8 deletions(-)

(limited to 'src')

diff --git a/src/main/java/com/amazon/carbonado/OptimisticLockException.java b/src/main/java/com/amazon/carbonado/OptimisticLockException.java
index 949537e..909e0c6 100644
--- a/src/main/java/com/amazon/carbonado/OptimisticLockException.java
+++ b/src/main/java/com/amazon/carbonado/OptimisticLockException.java
@@ -30,20 +30,26 @@ public class OptimisticLockException extends PersistException {
 
     private static final long serialVersionUID = 4081788711829580886L;
 
+    private final Storable mStorable;
+
     public OptimisticLockException() {
         super();
+        mStorable = null;
     }
 
     public OptimisticLockException(String message) {
         super(message);
+        mStorable = null;
     }
 
     public OptimisticLockException(String message, Throwable cause) {
         super(message, cause);
+        mStorable = null;
     }
 
     public OptimisticLockException(Throwable cause) {
         super(cause);
+        mStorable = null;
     }
 
     /**
@@ -68,14 +74,44 @@ public class OptimisticLockException extends PersistException {
      * @param savedVersion actual persistent version number of storable
      */
     public OptimisticLockException(Object expectedVersion, Object savedVersion) {
-        super(makeMessage(expectedVersion, savedVersion));
+        this(expectedVersion, savedVersion, null);
+    }
+
+    /**
+     * @param expectedVersion version number that was expected for persistent
+     * record when update was executed
+     * @param savedVersion actual persistent version number of storable
+     * @param s Storable which was acted upon
+     */
+    public OptimisticLockException(Object expectedVersion, Object savedVersion, Storable s) {
+        super(makeMessage(expectedVersion, savedVersion, s));
+        mStorable = s;
     }
 
-    private static String makeMessage(Object expectedVersion, Object savedVersion) {
+    /**
+     * Returns the Storable which was acted upon, or null if not available.
+     */
+    public Storable getStorable() {
+        return mStorable;
+    }
+
+    private static String makeMessage(Object expectedVersion, Object savedVersion, Storable s) {
+        String message;
         if (expectedVersion == null && savedVersion == null) {
-            return null;
+            message = null;
+        } else {
+            message = "Update acted on version " + expectedVersion +
+                ", but canonical version is " + savedVersion;
         }
-        return "Update acted on version " + expectedVersion +
-            ", but canonical version is " + savedVersion;
+
+        if (s != null) {
+            if (message == null) {
+                message = s.toStringKeyOnly();
+            } else {
+                message = message + ": " + s.toStringKeyOnly();
+            }
+        }
+
+        return message;
     }
 }
diff --git a/src/main/java/com/amazon/carbonado/spi/MasterStorableGenerator.java b/src/main/java/com/amazon/carbonado/spi/MasterStorableGenerator.java
index 11657de..b3bc830 100644
--- a/src/main/java/com/amazon/carbonado/spi/MasterStorableGenerator.java
+++ b/src/main/java/com/amazon/carbonado/spi/MasterStorableGenerator.java
@@ -546,7 +546,7 @@ public final class MasterStorableGenerator<S extends Storable> {
                 // if (version support enabled) {
                 //     if (this.getVersionNumber() != saved.getVersionNumber()) {
                 //         throw new OptimisticLockException
-                //             (this.getVersionNumber(), saved.getVersionNumber());
+                //             (this.getVersionNumber(), saved.getVersionNumber(), this);
                 //     }
                 // }
                 if (mFeatures.contains(MasterFeature.VERSIONING)) {
@@ -565,8 +565,10 @@ public final class MasterStorableGenerator<S extends Storable> {
                     b.loadLocal(savedVar);
                     b.invoke(mInfo.getVersionProperty().getReadMethod());
                     b.convert(versionType, TypeDesc.OBJECT);
-                    b.invokeConstructor(optimisticLockType,
-                                        new TypeDesc[] {TypeDesc.OBJECT, TypeDesc.OBJECT});
+                    b.loadThis();
+                    b.invokeConstructor
+                        (optimisticLockType,
+                         new TypeDesc[] {TypeDesc.OBJECT, TypeDesc.OBJECT, storableType});
                     b.throwObject();
                     sameVersion.setLocation();
                 }
-- 
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